Arcam A85 User manual

A85

DiVA A85, P85 & P85/3

Ampliﬁ ers

Service Manual

ARCAM

Issue 2.0

Contents List

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Contents list

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Circuit description

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Service guide

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Circuit diagrams

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Component overlays

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Circuit board parts list

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General assembly parts list

Pre-amplifier circuit description

The A85 preamplifier is a high-performance, DC coupled design

with microprocessor control of input select, two independent tape

loops, electronic volume control, tone bypass and electronic tone

control.

It features a discrete power supply and low-noise linear circuitry to

obtain very good distortion and noise performance, suitable for

high quality source material such as CD or DVD-A.

Input switching

Each of the inputs has a pair of diodes to the ±15V rails to prevent

static spikes from causing damage to the CMOS multiplexers. In

addition, there is a simple resistor-capacitor filter with a corner

frequency of approximately 340kHz to remove any unwanted high

frequency interference from the signal. This uses high-quality

polypropylene capacitors for best performance.

Z104 and Z105 are the main input select multiplexers, which are

configured in a ‘virtual earth’ unity gain arrangement with Z115

and Z116. This arrangement is slightly lower distortion than the

‘normal’ one, at the cost of a slightly higher noise floor. It is an

inverting configuration, which is restored to correct polarity by the

inverting electronic volume control which follows.

Z115B and Z116B are integrating servos, which take out any DC

from the input signal before the following stages. The servos are 2-

pole, with a passive 2

nd

pole being formed by R180 and C147 (for

the left channel) to remove broadband noise from the output of the

servo and improve speed of response.

Z100 thru Z103 are the input selectors for the 2 tape loops. These

are normal non-inverting selectors which are buffered before being

passed on to the phono sockets.

Z109A output is decoupled by R108 which is included in the

feedback path. Local high frequency feedback occurs around C108

to allow the tape loop output to be very low impedance, whilst

being stable into a capacitive load such as may be presented by a

screened interconnect cable. This is the same for all tape outputs.

Z106 is configured as a double pole changeover switch, used to

select the tone controls. The tone controls are bypassed when not

required so that the noise and distortion can be minimised.

Tone control circuit

The tone control circuit is a non-inverting one, using a gyrated

‘bell’ filter for the bass and a simple shelving filter for the treble.

Left channel description

The input is attenuated by 6dB and biased to a voltage of +2.5V

DC by C111, R113, R112, R110, R111 and C110. This is so the

signals fall within the 0 - 5VDC required by the digital

potentiometer Z108.

Z111B and its associated components form an active equivalent of

a series resonant LCR circuit. This has an impedance minimum of

5.4k at around 80Hz with Q=0.7 The reason the bass is done as a

band-boost filter rather than a shelving filter is so that you can

boost the ‘real’ bass without causing lots of sub-audio loudspeaker

cone excursion which wastes power and may damage the drive

units.

The digital pots Z108D and Z108A control the bass and treble

respectively. This is done by moving the wiper connected to the

frequency-sensitive impedance between the non-inverting and

inverting terminals of Z112A, effectively changing the ratio of

feedback boost and feed-forward attenuation of the circuit at the

desired frequencies, thus providing a EQ gain control that is

symmetrical on a logarithmic scale, with the use of a linear pot.

Z112B provides the 6dB of gain necessary to bring the nominal

signal level back to unity. C116 and C117 remove the 2.5VDC

offset from the output, to prevent clunks when the tone controls

are activated.

Z108 is controlled by a simple 3-wire serial interface from the

microprocessor. Each of the digital lines has its own ground return

to minimise electromagnetic interference. They are connected

together only at the GND pin of the IC.

Volume control

Z107 is a VSDVC electronic volume control IC. It works, in

conjunction with an external op-amp, by varying the feed-forward

and feedback resistors in an inverting gain configuration. In this

way, it can allow output signal swings of up to 22Vpp whilst

operating from a single +5VDC power supply. Also, it allows the

user the choice of external circuitry to fine-tune the performance.

The gain is controlled from the microprocessor via a 3-wire serial

interface. The analogue supply rail is derived from the local +5V

via R185 and C156 // C157.

Z117 is the output op-amp. Its outputs are decoupled via R186,

R187, C158 and C159 so that it has a low output impedance but

can drive cable capacitance without oscillation. R186 and R187

are included in the audio frequency feedback loop to reduce output

impedance when driving ‘difficult’ cables.

RLY100 is a mute relay which shunts the preamp output to

ground. This is to prevent thumps and squeals when the units is

powered up or down.

Power supply

The transformer winding is connected to SK300. The voltage is

rectified and smoothed by D300, D301, D306, D307 and C300,

C310. The unregulated voltage should be around ±27VDC. F300

and F301 are secondary fuses, as the low power preamp winding

would not blow the primary fuses if short circuited.

The voltage regulators are discrete compound emitter followers. I

will describe the +15V supply as the negative is essentially an

exact mirror image.

Q300 and R300 act as a constant current source, supplying around

7mA into D310. C302 and C314 reduce ripple and broadband

noise on the zener diode. Q305 and Q306 form a complementary

Darlington NPN transistor which is configured as an emitter

follower, producing the +15VDC at its output. C303 is to provide

bulk charge storage and to reduce the AC output impedance of the

power supply. D302 prevents reverse bias of the supply during

power down.

Z301 is a conventional LM317 type circuit to drop the +15V rail

down to +5V for the tone and volume control circuits.

Star point SP300 explicitly connects the differently named ground

nets together at one point, to minimise hum.

Amplifier & PSU Circuit Description

L882PB is the printed circuit board that provides the power supply

and output stage amplifiers for the A85 integrated and power

amplifiers.

Its function is to:

1. Drive the loudspeakers(!)

2. Provide an (always on) auxiliary 5VDC supply for the micro

controller and display interface

3. Receive logic signals from the micro controller to turn on

the main amplifier supply relay (mains) and connect either

pair of speaker output sockets

4. Send logic signals to the micro controller pertaining to the

state of the amplifiers (short circuit protection, DC offset

protection, thermal protection)

5. Receive and demodulate RC5 remote style control codes via

the rear panel jack and transmit them to the micro controller

6. Send a 12V trigger output via the rear panel jack for control

of an auxiliary power amp when the unit is on

7. Receive a 12V trigger input from the rear jack (for use in the

power amp only version)

8. Drive a pair of headphones via attenuating resistor networks

The power amplifier is a symmetrical, class B, bipolar junction

transistor output, current-feedback design (of which more later)

with DC-coupled signal and feedback paths, featuring an active

integrating voltage servo to control DC offsets.

It features ‘instantaneous’ safe operating area protection in

addition to sending a signal to the micro to turn off the output

relays in the event of user or thermal overload. Since it is a DC-

coupled design, the unit senses DC at the output and triggers the

micro to turn off the loudspeaker relays in the event of excessive

levels (possibly due to a faulty source component or short circuit

output transistor).

The output stage uses Sanken specialised ‘audio amplifier’ power

bipolar Darlington transistors which are optimised for use with this

type of topology. Consequently the unit has excellent measured

performance in terms of noise, slew rate, output impedance and

distortion (harmonic and intermodulated) and is essentially load

invariant (to a first order the measured performance is independent

of the load impedance).

L882 Circuit Sheet 1

The audio input to the amplifier is connected to SK102 (which

connects to the output of the preamp PCB). This signal is passed

on via SK104A which forms the preamp out connection to the

outside world.

SK104B provides the power amp input connection, with switch

SW100 selecting between pre / power and integrated modes. The

unit is wired as a preamp / power amp combination with the switch

depressed, allowing the user to insert a processor or other function

(e.g. graphic EQ) between the output of the preamp and the input

of the power amp. With the switch in the ‘out’ position the power

amp input socket is ignored and the input to the power amp is

connected internally to the output of the preamp. PL100 and

PL101 are ‘handbag’ links fitted to the power amp only version to

connect both pairs of phono sockets in parallel for daisy chaining

(as there is no preamp output on a power amp).

Relays RLY100 and RLY101 switch the two pairs of loudspeaker

output sockets and are controlled by the micro lines describes

above. Transistors TR100 and TR101 operate in ‘constant current

sink’ mode which allow relay current to be approximately constant

although the main power supply rails will vary with mains input

and load conditions. The current is around 20mA per relay.

Star point SP100 is the ground ‘mecca’ for the entire amplifier

(comprising all three PCBs within the unit). All of the separately

named grounds are joined explicitly at this point. Different named

grounds are used to ensure that no two ‘different’ grounds share

copper, which could compromise the noise, distortion or crosstalk

performance of the amplifier.

The loudspeaker output signals are passed to socket SK106 which

connects to SK107 and onto the headphone output via the

attenuation resistors R103 thru R106.

The hierarchy containing the other sheets is self explanatory. Each

of the port names shown on the top sheet connects to the port of

the same name on the lower sheets.

L882 Circuit Sheet 2

This sheet contains the power supplies, the rear panel jack socket

trigger circuits, the standby relay control and the ‘interface’

circuits between the output signals of the power amplifiers and the

inputs expected by the micro processor.

The mains input enters the unit at SK203, with capacitors C205

and C206 acting as conducted RF suppression. The earth

connection is passed on to the chassis (for safety reasons the

chassis metalwork remains connected to mains power earth at all

times). Switch SW200 is the voltage selector switch, allowing the

unit to be operated in 230V or 115V mains countries by switching

the dual-primary mains transformers between series and parallel

winding. Varistors VR200 and VR201 act to prevent over-voltage

surges from damaging the unit. If the user selects 115V operation

and then connects the unit to a 230V supply, the varistors will go

to a low impedance and blow the primary fuses. Any very high

voltage line transients will also be suppressed, helping to eliminate

transformer isolation breakdown.

Relay RLY200 switches the primary side of the mains transformer,

allowing the micro to control the on / off status of the amplifier. Its

contacts are snubbed by capacitors C207 and C208 (to eliminate

switching spark transients and prolong relay lifespan). The primary

windings of the toroidal mains transformer connect to SK204.

PCB mounted transformer TX200 is powered all the time that

mains is present on SK203, irrespective of the on / off status of the

amplifier. This is to ensure that the micro processor is always

operational and can thus control the mains switching for the main

amplifier. Secondary fuse F202 limits the current in the event of a

failure mode, as the short circuit primary current of TX200 would

be insufficient to blow the mains fuses.

Diodes D200 thru D203, C227 and IC201 provide the 5VDC

supply which powers the micro and display PCB and the relay

coils. C224 is to reduce diode noise being transmitted back

through the leakage capacitance of TX200.

The mains transformer secondary winding is connected to SK200.

This is a centre tapped winding, and is used with full bridge

rectifier BR200 to produce the main positive and negative supplies

for the power amp. C209 and C210 are the large reservoir

capacitors, with C211 and C212 acting as high frequency

decouplers. The main power supply rails and ground are accessible

on SK205 for future module expansion.

The circuitry around SK201A and IC200 is to receive and

demodulate remote control commands sent in via the rear panel

jack socket. This is for multi-room applications.

L200 and C200 form a parallel resonant circuit at approximately

37kHz. The output from this bandpass filter is passed into IC200A

where it is ‘chopped’ and fed to IC200B to provide the output

signal.

SK201B is a 13VDC signal trigger output which is active

whenever the amplifier is powered up. R218 and DZ207 / C223

provide a reference voltage which is buffered by TR200. TR201

and R217 act as a current limit and prevent damage due to a short

circuit on the output of SK201B. The maximum current is

approximately 65mA.

TR203 and TR202 are a complementary Darlington pair which

turn on mains relay RLY200 when activated by a signal from the

microprocessor.

TR204 and its associated components are to detect whenever AC

mains is present at the IEC socket. This is to notify the

microprocessor if the user has unplugged the mains cord, so that it

can take the necessary action (muting all the outputs and switching

off the mains relay). The reservoir capacitors should last at least 4

mains cycles which gives the microprocessor plenty of time for a

controlled shutdown.

TR204 forms a monostable circuit. Each cycle of AC turns on

TR204 via R211. TR204 then ‘shunts’ C229 ensuring that it is

kept at a low potential. If more than one mains cycle is missing,

then R219 charges up C229 sufficiently to trigger Schmitt inverter

IC202E thus passing on a logic signal to the microprocessor. The

use of a Schmitt inverter for IC202 is to ensure that the micro

receives ‘clean’ logic levels - the hysteresis voltage (about 0.5V) is

sufficient to prevent circuit noise from producing a string of

‘ghost’ signals when analogue levels are near the threshold point.

TH200 is a positive tempco thermistor placed adjacent to the

heatsink on which the output transistors are mounted. When the

temperature of the thermistor exceeds 90 degrees Celsius the

thermistor goes to a high impedance and so the input to IC202F

goes low. This triggers a HIGH output to the micro indicating

thermal overload.

The VI protection signals from the left and right channels pass into

IC202A and IC202B respectively, to be ‘cleaned up’ via the

Schmitt trigger. They are then NOR’d using TR205 which sends a

HIGH signal to the micro in the event of either channel suffering a

short circuit or current overload. Exactly the same approach is

used for the DC fault lines using IC202C and IC202D.

L882 Circuit Sheet 3

This is the main audio power amplifier circuit. The amplifier is a

class B design, which uses SAP ‘audio’ transistors in a

symmetrical current feedback configuration. Input and feedback

paths are DC coupled and there is an active integrating servo to

remove DC offsets from the output.

The basic principle of operation is follows:

The input signal is amplified by a factor of 2 in IC300A. This

drives a 44 impedance to ground causing the supply pin currents

to change with the signal level. These changing supply pin currents

are then ‘reflected’ by a pair of complementary Wilson mirrors

and passed on to a series of buffer transistors before being

connected to the load. The ‘feedback current’ flows back from the

output terminal via R331 and R332 and attempts to provide the

current necessary to allow IC300A to swing its output without

drawing excessive current from its supply pins, thus making the

change in supply current very small indeed. This is why the term

‘current feedback’ is used - it is the current flowing in the

feedback resistors that sets the overall gain of the amplifier.

IC300B acts as an inverting integrator and its purpose is to remove

DC from the loudspeaker output. Any positive DC offset will

cause the output of IC300B to go negative, thus increasing the

current in its negative supply pin and pulling the output voltage

back towards zero. R330 and C317 set the time constant of this

integrator (0.47 seconds) so that audio frequency components are

ignored and only DC and subsonic frequencies are removed.

The input to the amplifier is limited to ±5.4V via back-to-back

zener diodes DZ302 and DZ303. This is to prevent the user from

grossly overdriving the input to the amplifier and possibly causing

damage. The diodes appear before series resistor R324 so that their

variable capacitance does not introduce high frequency harmonic

distortion.

R324, R327 and C316 act as an input filter - this is a first order

low pass filter with a corner frequency of around 340kHz to

prevent RF signals from being injected into the front end of the

amplifier. The corner frequency was chosen such that the phase

shift introduced is less than 5 at 20kHz (considered by the AES

to be the minimum perceptible relative amount by the human ear).

The input impedance of the amplifier is 23kW at DC, falling to

around 14kW at 20kHz.

Operational amplifier IC300A is acting as a non-inverting gain of

2, driving the input signal into a 44W impedance to ground via

R322 and R337. Its output voltage will be an accurate

amplification of its input voltage (i.e. the signal on pin 1 should

look identical to that on pin 3 but at twice the amplitude). The op-

amp is used in a slightly unusual configuration here, in that its

power supply pins are used as a (current) output, and its output pin

is used as a (current) feedback.

Transistors TR311 and TR303 supply the ±15V rails to the op-

amp, and act as cascades to pass its supply pin currents through to

the current mirrors, which sit at a potential too high for the op-amp

to be connected directly.

TR300, TR301 and TR321 form a PNP Wilson current mirror,

which reflects the current sunk by the positive supply pin of

IC300. Likewise TR314, TR315 and TR320 form an NPN Wilson

current mirror, which reflects the current sourced by the negative

supply pin of IC300.

R315 thru R318 provide emitter degeneration of approximately

300mV for the current mirrors (as they pass about 3mA DC in

quiescent conditions), to ensure accurate operation independent of

the small variations between the transistors in the current mirrors.

They also ensure that the current passing down the next stage is

reasonably constant as the internal temperature of the amplifier

changes, swamping out small thermal variations in the V

BE

of the

mirror transistors.

R319 and R320 slightly decouple the rails to the current mirrors

from the main power rails of the amplifier, to allow the bootstrap

circuit to operate. The bootstrap consists of C302 and C306 with

metal film power resistors R352 and R353. The bootstrap is

provided to allow the power supply rails of the current mirrors to

go up and down slightly with the output signal into the

loudspeaker. This enables the driver stage to fully saturate the

output transistors and thus give the greatest power output and best

thermal efficiency for any given power rail voltage. The voltage on

the ‘inside’ end of R319 and R320 will vary by about 12 volts

peak to peak at full output power, rising above the main power

rails during signal peaks.

C307 and C308 with R333 and R335 provide the compensation

necessary to ensure stability when the loop is closed. They are

Miller capacitors which dramatically reduce the transimpedance

(i.e. current to voltage gain) of the current mirrors at high

frequencies. The present value of 47pF provides for a unity gain

open loop bandwidth of around 75MHz, whilst ensuring a closed

loop gain margin of around 6dB (note that gain margin in a current

feedback design is not dependent on system bandwidth to a first

order approximation). R333 and R335 provide a ‘zero’ in the open

loop frequency response which is tailored to give the best time

domain performance (i.e. to make high frequency square waves

look square with minimal ringing or overshoot).

DZ304 and C311 provide a fixed 4.7V bias voltage to allow the

following stages to operate correctly. C311 is there to ensure that

both halves of the following stage receive an equal AC signal

component at high frequency.

TR310 and TR307 are the ‘pre-driver’ transistors, which act to

buffer the outputs from the preceding stage and drive the

Darlington output power transistors. TR309 and R321 act as a

current limit, to ensure that the emitter current of TR310 does not

exceed 30mA in a fault condition. TR306 and R323 provide the

same function for TR307.

R338 and R339 are to loosely couple the outputs of the pre-driver

stage to the inputs of the Darlington power output devices. This is

so that the inbuilt temperature sensing diodes of the output

transistors can accurately control the quiescent current of the

output stage as the junction temperature of the power devices

varies. C312 and C318 ensure that both halves of the output stage

receive an equal AC signal component.

The output transistors are TR318 and TR319. These are Sanken

SAP15N and SAP15P devices respectively. They are specially

designed for audio power amplifier use. In addition to high current

gain (Darlington with a typical h

FE

of 20,000) they provide an

inbuilt emitter resistor (thick film power resistor of 0W22) and

temperature sensing diodes which closely and rapidly track the

V

BE

versus temperature characteristic of the power transistors,

allowing for easy, fast-responding and reasonably accurate control

of quiescent current (one of the major headaches of class B

amplifier design!)

RV300 is for fine trimming of the quiescent current. PL300

provides a convenient measuring point for this, which is short-

circuit protected in the event of a slip with the multimeter probe!

All of the remaining circuitry to the right of TR318 and TR319 is

essentially for output stage protection...

Transistors TR312 and TR304, along with the network of resistors

and capacitors to which they are connected, provide instantaneous

overload protection of the output stage. This is a conventional

single slope VI protection scheme, which allows much greater

current to be delivered into a rated load than into a short circuit.

The values allow for 18A peak delivery (at clip) into a purely

resistive load, 7A peak (at clip) into a purely capacitive load and

around 4A peak into a short circuit. R345, C303, R346 and C304

allow these values to be doubled for short transient bursts

(approximately 2.7 milliseconds) so that impulsive musical

transients can be delivered cleanly with minimal risk of damaging

the output transistors.

TR313, TR302 and their associated components send a signal to

the microprocessor when the instantaneous protection circuits are

having to work ‘hard’ to prevent amplifier overload. This instructs

the micro that the user is severely abusing the amplifier and will

switch off the loudspeaker relays to prevent possible permanent

damage. In reality, if you short circuit the outputs at any

appreciable volume level, this circuit will trigger and the

microprocessor will turn off the loudspeaker relays and send a

signal to the user.

R308, R314 and C320 form a low pass filter from which the DC

detection circuits can sense excessive DC at the loudspeaker

outputs. If there is any positive DC present, then TR316 will turn

on, which turns on TR305 and thus activates the DC protection

line to the micro, turning off the loudspeaker relays.

If there is any negative DC present, then TR308 will turn on,

which turns on TR317 which then turns on TR305 in turn, causing

the same effect.

R350 and C319 are the Zobel network which is provided to ensure

the amplifier ‘sees’ a constant and resistive load at very high

frequencies, to aid stability, although the amplifier will be stable

without the Zobel fitted.

C313 locally couples the ‘high frequency’ and loudspeaker ground

returns together at the output to overcome the effects of track

inductance back to the star point. C309 couples the ‘high

frequency’ and signal grounds together at the input for the same

reason.

D303 and D304 are ‘flyback’ diodes to protect the output

transistors from reverse bias when the amplifier is heavily clipped

into an inductive load (such as a loudspeaker voice coil!)

Sheet 4 is an identical copy of sheet 3 so I will not describe it

separately.

L870 Phono Circuit Description

The Phono board is a simple single stage RIAA amplifier. It

consists of two channels of high gain amplification, and switching

between moving magnet (MM) and moving coil (MC) settings.

PSU

The unit derives its ±15V regulated rails from the unit it is fitted

into with only local decoupling capacitors on board.

Interface

The unit connects to the host unit via a 8 way connector:

Amplifier

The left channel has designators beginning with 100, and the right

with 200. For the purposes of this description the left channel will

be described, as the right channel the same in all respects.

The amplifier is a small signal class A voltage feedback amplifier

with switchable gain. The input consists of an actively loaded

differential pair of very low noise PNP transistors (TR106,107).

These transistors are very specific and should only be replaced

with identical parts with the E grade high gain. TR100 & TR101

form a current source for the pair, which sets the quiescent current

for the entire amplifier. The active load consists of TR110 &

TR111, which forms part of a differential current mirror with

TR112,113 & 114. This differential stage also has an active load

(TR102 & TR103) to keep gain to a maximum.

Both of these differential stages are designed to have as much gain

as possible to enable the single stage design. The RIAA response

is achieved in the feedback network:

C101,110,111,112,119,120,&R115,112. C115 is used to correct

between MM & MC gains as the amplifier is non-inverting.

SW100 switches between MM & MC. Two poles of the switch

change between the different loading required for each type of

cartridge: R108 & C109 for MM, and added in parallel for MC

R104 & C108. The other two poles change the feedback resistor

value to alter the gain. MM: R105 and in parallel for MC R123.

The DC offset is controlled by a non-inverting servo built around

IC100. The amount of servo current is different for each gain

setting via R111 (MM) & R124(MC) so that the low frequency

high pass point remains the same for both settings. However the

high pass point for the circuit is set by C113. This gives a warp

filter, stops DC startup thumps from upsetting DC coupled

circuitry and an approximation of the RIAA/IEC curve (-2dB @

20Hz).

The output is class A buffered by a dual mirror follower

(TR104,105,108,109). The quiescent current is set up by D100

and R118,119.

Closed loop stability is achieved with C116,117, giving

symmetrical slewing capability.

SK103 connects to the micro controller and display PCB.

The 14 pin connector is numbered as follows:

No Name Type Description

1 +5V_D O/P 5 volt digital supply (for micro)

2 0V_D O/P Digital ground

3 +49V O/P Main power supply for VFD (via fusible resistor)

4 STANDBY I/P Mains relay control signal (HIGH = ON)

5 SPKR1 ON I/P Speaker 1 relay control signal (HIGH = ON)

6 SPKR2 ON I/P Speaker 2 relay control signal (HIGH = ON)

7 THERMPROT O/P Over temperature protect (HIGH = FAULT)

8 VIPROT O/P Short circuit protect (HIGH = FAULT)

9 DCPROT O/P DC offset protect (HIGH = FAULT)

10 AC PRESENT O/P Indicates AC mains is plugged in (HIGH = ON)

11 TRIGGER O/P 12V DC trigger input (HIGH = ON)

12 REMOTE O/P Demodulated RC5 remote input from rear panel

13 0V_D O/P Spare digital ground pin

14 +5V_D O/P Spare 5 volt digital supply pin

The ground naming convention is as follows:

Name Description

0V_D Digital ground (used for micro processor circuitry, display and interface)

0V_LS_R Right channel loudspeaker ground return

0V_SIG Signal ground (this is the ‘clean’ precision reference ground)

0V_PSU Power supply ground (high current pulses for the large reservoir caps)

0V_TRIG Ground return for the jack socket trigger and remote control circuit

0V_HF_R Decoupling ‘noisy’ ground for the right channel power amp

0V_LS_L Left channel loudspeaker ground return

0V_HF_L Decoupling ‘noisy’ ground for the left channel power amp

A85, P85, P85/3 Service Guide

Build History

ECO

Number

Date Description of Change

00_1089 02/10/00 A85 – Fascia position changed to prevent display buttons sticking

00_1129 01/11/00 A85, P85, P85/3 – Improved stability under heavy clipping of amplifier R345,

R346, R445, R446 changed from 100R to 0R link

C307, C308, C407, C408 changed from 47P to 100P capacitors

00_1138 27/11/00 A85, P85, P85/3 – C303, C304, C403 changed from 10uF to 100uf capacitors –

this prevents protection circuit from operating when driving a 4 ohm load at

low frequency

01_1030 23/02/01 A85, P85, P85/3 – RV300, RV400 changed to 220R presets to make it easier to

adjust the bias settings

01_1068 11/04/01 A85, P85, P85/3 – New output device clamp fitted to heatsink

01_1101 04/06/01 A85, P85, P85/3 – Sensitivity of DC offset detection circuit reduced – Power

amp cct R308, R408 changed to 22K - R314, R414 changed to 10K

PSU surface mount fuse F202 up rated from 500mA to 750mA

01_1142 22/08/01 A85 – Preamp board upgraded from L866 to L937

01_1178 12/10/01 A85, P85, P85/3 – Speaker terminals changed from Camcon to 4mm binding

post

01_E014 28/11/01 A85 – Preamp board fuses F300, F301 up rated to 2A surface mount

02_E033 31/01/02 A85 – Extra pad F038 fitted under TX to stop TX coming loose in transit

02_E035 04/02/02 A85, P85, P85/3 – Main 20mm fuse rating changed to 4AT

Software History

ECO

Number

Date Version Description of Change

01_1072 18/04/01 1.1 Remote standby action changed from turning unit completely off

to putting unit into standby

01_1095 21/05/01 1.2 Delay added to start H8 start up routine (volume control chip)

01_1167 12/09/01 1.3 Volume chip read/write protocol changed

01_1179 26/10/01 2.0 Added the processor mode option

01_E011 23/11/01 2.1 Corrected the welcome message saving fault. This fault was

introduced with version 2.0 software

02_E048 15/02/02 2.2 Corrected the processor loop volume jump when v/c adjusted

Current Fuse Ratings (20/02/02)

Fuse Position Fuse Rating

Main Supply fuses - A85, P85, P85/3 2 x 4AT 20mm (Arcam part number C12406)

PSU fuse F202 - A85, P85, P85/3 750mA surface mount (Arcam part number C3751)

Preamp fuses F300, F301 – A85 2A surface mount (Arcam part number C3202)

Quiescent Current Setting

Left channel Measure points indicated on PCB -

Adjust RV300 for 8.5mV cold or 12 mV when warm

Right channel Measure points indicated on PCB -

Adjust RV400 for 8.5mV cold or 12 mV when warm

Fault Diagnostics

Hints & Tips

!

To check software version press PHONO, TUNER, DVD buttons on the front panel

simultaneously.

!

On issue 2 phono boards only, fit Kapton insulation tape to the phono stage PCB (rear panel

end) to prevent track shorting to chassis.

!

Check all fuses are the correct rating.

!

Check DC offset alterations are fitted as per ECO 01_1101

!

To isolate a fault between the pre or power amp section press the PRE/PWR button on the

rear panel to separate the two sections.

!

Check R100 on amp/psu board is not shorting to the track underneath (through plated via).

Fault Action

No power Check fuses

Check power supply rails

Unit functions ok but no audio Check preamp fuses

Check RL100A (volume control mute relay)

Check +5V supply rail

Check mute signal line

Volume control locks up Check software version is 2.0 or higher

DC offset Check equipment connected to amp for DC on the audio leads

Check alterations as per ECO 01_1101 have been fitted

Unit fails to respond to commands Check ribbon cable from display to main board

Check ribbon cable from display to preamp board

Unit gets very hot Check power stage IQ settings

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:

DATE

Filename

ECO No. DESCRIPTION OF CHANGE

L882C1_3.2.PRJ

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

Cambridge CB5 9PB

A85 amplifier and PSU - top sheet

Circuit Diagram

L882C1

J Reckless

6-Jun-2001

INITIALS

Date Printed

1 4Sheet of

Notes:

Top+

Top-

SK100A

CAMCON_G

Bot+

Bot-

SK100B

CAMCON_G

Top+

Top-

SK101A

CAMCON_G

Bot+

Bot-

SK101B

CAMCON_G

D100

1N4003F

D101

1N4003F

1 2

34

5 6

78

SP100

STAR_8

EMC

1

N

F

SK104A

PHONO4G

N

F

SK104B

PHONO4G

0V_SIG

1

2

3

SW100A

2PCO

4

5

6

SW100B

2PCO

C100

1N0 SM

1

2

3

4

SK102

AMPCT4

STANDBY

SPKR1 ON

SPKR2 ON

THERMPROT

VIPROT

DCPROT

AC PRESENT

L SIG

R SIG

SPKR1 ON

SPKR2 ON

THERMPROT

VIPROT

AC PRESENT

DCPROT

LS L

LS R

L SIG

0V_SIG

0V_LS_L

0V_HF_L

+49V

-49V

+5V_D

+49V

-49V

0V_D

0V_PSU

R SIG

0V_SIG

0V_LS_R

0V_HF_R

+49V

-49V

0V_TRIG

LS L

0V_LS_L

0V_LS_R

LS R

+49V

0V_D

VIPROT_L

DCPROT_L

VIPROT_R

DCPROT_R

VIPROT_L

VIPROT_R

STANDBY

+49V

+5V_D

0V_D

0V_PSU

0V_LS_R

0V_HF_R

0V_LS_L0V_HF_L

0V_D

0V_TRIG

0V_SIG

R103

330R 1W CF

R104

330R 1W CF

R105

100R 1W CF

R106

100R 1W CF

1

2

3

4

SK106

AMPCT4

LHC

2

RHC

3

1

4

L

5

6

R

7

SK105

HPSKT

1

2

3

4

SK107

AMPCT4

LS L

LS R

0V_LS_L

REMOTE

FROM PREAMP

INTEGRATED / PRE-POWER

MODE SELECT SWITCH

TRIGGER

TP102

TP101

TP100

TP103

TP104

TP105

TP106

TP107

TP108

TP109

TP110

TP117

TP111 TP113 TP115

TP112 TP114 TP116

0V_D +5V(D)

VPOS

VNEG

0V_PSU

PWRON

THPROT_uCVIPROT_L

VIPROT_R VIPROT_uC

AC_PRES0V_TRIG

DCPROT_L

DCPROT_R

DCPROT_uC

RC5 IN

TRG IN

L882C2

L882C2_3.2.SCH

INPUT

0V_SIG

VIPROT

DCPROT

OUTPUT0V_LS

0V_HF

VPOS

VNEG

L882C3

L882C3_3.2.SCH

INPUT

0V_SIG

VIPROT

DCPROT

OUTPUT0V_LS

0V_HF

VPOS

VNEG

L882C4

L882C4_3.2.SCH

RLY100A

RLY G5Z-2A-E

RLY100B

RLY G5Z-2A-E

RLY100C

RLY G5Z-2A-E

RLY101A

RLY G5Z-2A-E

RLY101B

RLY G5Z-2A-E

RLY101C

RLY G5Z-2A-E

TR100

BD179

TR101

BD179

R101

100R SM

R102

100R SM

R107

220R SM

R108

220R SM

PCB

L882PB_3

TP118

TP119

TP120

TP121

1

2

3

4

5

6

7

8

9

10

11

12

13

14

SK103

FFC 14W 2.54MM VER

8K7014

EARTH LEAD

8M101

EL

EARTH LEAD

1

2

PL100

1

2

PL101

00_1086 JR 19/9/00 NO CHANGE TO THIS SHEET

2.0

R100

10R MF

00_1115 JR 16/10/00 NO CHANGE TO THIS SHEET

00_1129 JR 1/11/00 NO CHANGE TO THIS SHEET

2.1

2.2

00_1138 JR 27/11/00 NO CHANGE TO THIS SHEET

2.3

00_1134 MGM 17/11/00 NO CHANGE TO THIS SHEET

2.4

01_1101 JR 6/4/01 POWER SUPPLY FUSES AND DC OFFSET 3.2

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:

DATE

Filename

ECO No. DESCRIPTION OF CHANGE

L882C2_3.2.SCH

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

Cambridge CB5 9PB

A85 amplifier - power supply and microcontroller interface

Circuit Diagram

L882C2

J Reckless

6-Jun-2001

INITIALS

Date Printed

2 4Sheet of

Notes:

L

N

E

N E L

SK203

IEC3 NO RIVETS

BC200

TOOLING4.1

Green

1

SK202

CAGECLAMP1

C205

3N3 MAINS

C206

3N3 MAINS

Far from PCB

SK201B

JACK3.5X2

Near to PCB

SK201A

JACK3.5X2

SW200B

VOL SEL SLIDE

SW200A

VOL SEL SLIDE

C208

3N3 MAINS

C207

3N3 MAINS

Vin

I

GND

G

Vout

O

IC201

7805

D203

1N4003F

D201

1N4003F

D202

1N4003F

D200

1N4003F

C225

100N CD

C226

100N CD

VR201

VDR 115V

VR200

VDR 115V

+

1

~

2

-

4

~

3

BR200

BRGBU8D

LIVENEUTRAL

EARTH

EMC Shield

SH200

EMCMAINS

NEUTRAL

LIVE

NEUTRAL

0V_D

+5V(D)

0V_D

0V_PSU

VPOS

VNEG

0V_PSU

+49V

+5V_D

0V_D

PWRON

-49V

+5V_D

TH200

PTH90DEG

+5V_D

0V_D

THPROT_uC

VIPROT_L

VIPROT_R

+5V_D

0V_D

VIPROT_uC

0V_D

9VRMS

+5V_D

0V_D

9VRMS

+

C229

22U EL

AC_PRES

+

C227

3300u 25V

+

C228

1000u 10V

2

3

4

6

7

8

1 5

SK204

MOLEXPWR8

1

2

3

4

5

6

SK200

MOLEXPWR6

D206

BAS16W SM

TR204

BC849B

R211

10K SM

R220

10R SM

R200

1K0 SM

TR202

FMMT597

D205

BAS16W SM C213

10N SM

TR203

FMMT497

DZ207

15V 350MW SM

+

C223

10U EL

+

C222

10U EL

R210

10K SM

+49V

0V_TRIG

1 2

IC202A

74HC14D

3 4

IC202B

74HC14D

1011

IC202E

74HC14D

1213

IC202F

74HC14D

C214

10N SM

C215

10N SM

R213

4K7 SM

R214

4K7 SM

TR205

BC856B

R206

1K0 SM

C218

10N SM

C203

100N SM

DCPROT_L

DCPROT_R

+5V_D

0V_D

DCPROT_uC

0V_D

5 6

IC202C

74HC14D

89

IC202D

74HC14D

C216

10N SM

C217

10N SM

R215

4K7 SM

R216

4K7 SM

TR206

BC856B

R207

1K0 SM

C220

100N SM

C204

100N SM

14

7

IC202G

74HC14D

C201

100N SM

C202

100N SM

R205

1K0 SM

R221

10R SM

C224

100N CD

R219

1K8 SM

R212

4K7 SM

TR201

FMMT497

TRIGGER OUTPUT

APPROX 13.5VDC

60mA MAX CURRENT

R201

1K0 SM

R202

1K0 SM

R203

1K0 SM

R204

1K0 SM

C219

10N SM

C221

10N SM

MAINS WIRING AND AUXILIARY SUPPLY

POWER AMP SUPPLY

MICROPROCESSOR SIGNALS INTERFACE

HS

HS200

TO220HS08REG

1

2

3

4

5

6

SK205

AMPCT6

RLY200A

DPDT5V

RLY200B

DPDT5V

RLY200C

DPDT5V

115V

6

4

2

1 0V

5

8

9V

0V

9V

3

7

0V

TX200

TX 3VA 9301

TR200

BD179

R217

10R SM

R218

10K SM

STANDBY RELAY CONTROL

R227

1K0 SM

DZ204

4V7 350MW SM

R228

100K SM

L200

27mH

C200

680P PP

3

2

1

IC200A

LM393A SM

R223

10K SM

R229

100K SM

R209

10K SM

R224

1K8 SM

R230

1K5 SM

5

6

7

IC200B

LM393A SM

84

IC200C

LM393A SM

R225

1K8 SM

C231

1N0 SM

R208

10K SM

C232

100N SM

0V_TRIG

+5V_D

RC5 IN

CARRIER FILTER AND DEMODULATOR

C230

10N SM

MODULATED RC5

REMOTE CONTROL INPUT

+

C233

10U EL

R222

10K SM

TRG IN

TP206

TP200

TP207

TP203

TP201

TP202

TP210

TP204

TP205

TP208

TP209

TP211

TP212

+

C209

10,000u 63V

+

C210

10,000u 63V

R226

470R SM

C211

100N PC

C212

100N PC

F200

AS2A

F201

AS2A

CHASS

SK101C

CAMCON_G

C235

1N0 SM

C234

220N X2 CLASS

R231

1M5 VR25

00_1086 JR 19-9-00 R231, C234, C235 ADDED FOR EMC 2.0

NF

00_1115 JR 16/10/00

00_1129 JR 1/11/00 NO CHANGE TO THIS SHEET

NO CHANGE TO THIS SHEET 2.1

2.2

00_1138 JR 27/11/00 NO CHANGE TO THIS SHEET 2.3

00_1134 MGM 17/11/00 NO CHANGE TO THIS SHEET

2.4

01_1101 JR 6/4/01 POWER SUPPLY FUSES AND DC OFFSET 3.2

F202

T750mA SM

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:

DATE

Filename

ECO No. DESCRIPTION OF CHANGE

L882C3_3.2.SCH

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

Cambridge CB5 9PB

A85 amplifier - power output stage left

Circuit Diagram

L882C3

J Reckless

6-Jun-2001

INITIALS

Date Printed

3 4Sheet of

Notes:

R324

1K0 SM

TR300

FMMT597

TR301

FMMT597

R315

100R SM

R316

100R SM

R319

100R SM

TR314

FMMT497

TR315

FMMT497

R317

100R SM

R318

100R SM

R320

100R SM

R322

22R SM

0V_SIG

C317

470N PE

0V_SIG

INPUT

0V_SIG

R350

5R6 2W CF

C319

100N PE

0V_HF 0V_LS

C313

100N SM

R341

330R SM

R342

330R SM

R343

100R SM

R344

100R SM

R345

0R0 SM

R346

0R0 SM

R334

22K SM

R336

22K SM

D301

BAS16W SM

D302

BAS16W SM

TR312

FMMT497

TR304

FMMT597

TR313

FMMT497

TR302

FMMT597

DZ305

4V7 350MW SM

0V_HF

VIPROT

C320

100U NP

TR305

FMMT597

DZ306

4V7 350MW SM

0V_HF

DCPROT

OUTPUT

0V_LS

0V_HF

VPOS

VNEG

0V_HF

DZ300

15V 350MW SM

DZ301

15V 350MW SM

C309

100N SM

C310

100N SM

C314

100N SM

0V_SIG

D304

1N4003F

D303

1N4003F

R302

10K SM

R327

22K SM

RV300

100R PSET

C312

10N SM

1

2

PL300

BIAS

R325

1K0 SM

R326

1K0 SM

ADJ BIAS

D300

BAS16W SM

R300

10K SM

R309

10K SM

R305

10K SM

R306

10K SM

+

C305

10U EL

MEASURE

TR318

SAP15N

TR319

SAP15P

R301

10K SM

C315

100N SM

R347

100R SM

R349

100R SM

R348

100R SM

R340

100K SM

DZ302

4V7 350MW SM

DZ303

4V7 350MW SM

3

2

1

84

IC300A

TL072CD

5

6

7

IC300B

TL072CD

R328

4K7 SM

0V_HF

0V_SIG

TR311

FMMT497

TR303

FMMT597

TR310

FMMT497

TR307

FMMT597

C307

100P SM

C308

100P SM

INPUT FILTER V TO I AMP

DC SERVO

PNP CURRENT MIRROR

NPN CURRENT MIRROR

PRE DRIVER

OUTPUT STAGE

V-I PROTECTION

VI PROTECT

SIGNAL TO MICRO

DC OFFSET

DETECTION

DC OFFSET SIGNAL

TO MICRO

ZOBEL NETWORK

TR316

FMMT497

TR308

FMMT597

TR317

FMMT497

R311

10K SM

R312

10K SM

R313

10K SM

R303

10K SM

R304

10K SM

R307

10K SM

R310

4K7 SM

R329

4K7 SM

+

C300

100U EL

+

C301

100U EL

R338

150R SM

R339

150R SM

R308

22K SM

R314

10K SM

TR309

FMMT497

TR306

FMMT597

R323

22R SM

R321

22R SM

TP302

TP303

TP304

TP307

TP308

TP305

TP306

R337

22R SM

R331

1K5 SM

R332

1K8 SM

R330

1M0 SM

R333

3K3 SM

R335

3K3 SM

L300

2U2H LAC SMALL

R351

10R MF

C316

470P PPW

C311

100N PC

+

C318

10U EL

TR321

FMMT597

TR320

FMMT497

+

C302

100U EL 100V

+

C306

100U EL 100V

R352

470R 2W MF 5%

R353

470R 2W MF 5%

BOOTSTRAP

(SET TO 16mV)

00_1086 JR 19/9/00 NO CHANGE TO THIS SHEET 2.0

00_1115 JR 16/10/00 R338 R339 CHANGED TO 150R

00_1129 JR 1/11/00 R345 R346 C307 C308 VALUE CHANGES

2.1

2.2

+

C303

100U EL

+

C304

100U EL

00_1138 JR 27/11/00 C303 C304 FROM 10U TO 100U 2.3

00_1134 MGM 17/11/00 NO CHANGE TO THIS SHEET

2.4

TR322

FMMT497

R354

1K0 SM

R355

6K8 SM

01_1101 JR 6/4/01 POWER SUPPLY FUSES AND DC OFFSET 3.2

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:

DATE

Filename

ECO No. DESCRIPTION OF CHANGE

L882C4_3.2.SCH

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

Cambridge CB5 9PB

A85 amplifier - power output stage right

Circuit Diagram

L882C4

J Reckless

6-Jun-2001

INITIALS

Date Printed

4 4Sheet of

Notes:

R424

1K0 SM

TR400

FMMT597

TR401

FMMT597

R415

100R SM

R416

100R SM

R419

100R SM

TR414

FMMT497

TR415

FMMT497

R417

100R SM

R418

100R SM

R420

100R SM

R422

22R SM

0V_SIG

R430

1M0 SM

R431

1K5 SM

R432

1K8 SM

C417

470N PE

0V_SIG

INPUT

0V_SIG

R450

5R6 2W CF

C419

100N PE

0V_HF 0V_LS

C413

100N SM

R441

330R SM

R442

330R SM

R443

100R SM

R444

100R SM

R445

0R0 SM

R446

0R0 SM

R434

22K SM

R436

22K SM

D401

BAS16W SM

D402

BAS16W SM

TR412

FMMT497

TR404

FMMT597

TR413

FMMT497

TR402

FMMT597

DZ405

4V7 350MW SM

0V_HF

VIPROT

C420

100U NP

TR405

FMMT597

DZ406

4V7 350MW SM

0V_HF

DCPROT

OUTPUT

0V_LS

0V_HF

VPOS

VNEG

0V_HF

DZ400

15V 350MW SM

DZ401

15V 350MW SM

C409

100N SM

C410

100N SM

C414

100N SM

0V_SIG

D404

1N4003F

D403

1N4003F

R402

10K SM

R427

22K SM

RV400

100R PSET

C412

10N SM

1

2

PL400

BIAS

R425

1K0 SM

R426

1K0 SM

ADJ BIAS

D400

BAS16W SM

R400

10K SM

R409

10K SM

R405

10K SM

R406

10K SM

+

C405

10U EL

MEASURE

TR418

SAP15N

TR419

SAP15P

R401

10K SM

C415

100N SM

R447

100R SM

R449

100R SM

R448

100R SM

R440

100K SM

DZ402

4V7 350MW SM

DZ403

4V7 350MW SM

3

2

1

84

IC400A

TL072CD

5

6

7

IC400B

TL072CD

R428

4K7 SM

0V_HF

0V_SIG

TR411

FMMT497

TR403

FMMT597

TR410

FMMT497

TR407

FMMT597

C407

100P SM

C408

100P SM

INPUT FILTER V TO I AMP

DC SERVO

PNP CURRENT MIRROR

NPN CURRENT MIRROR

PRE DRIVER

OUTPUT STAGE

V-I PROTECTION

VI PROTECT

SIGNAL TO MICRO

DC OFFSET

DETECTION

DC OFFSET SIGNAL

TO MICRO

ZOBEL NETWORK

TR416

FMMT497

TR408

FMMT597

TR417

FMMT497

R411

10K SM

R412

10K SM

R413

10K SM

R403

10K SM

R404

10K SM

R407

10K SM

R410

4K7 SM

R429

4K7 SM

+

C400

100U EL

+

C401

100U EL

R438

150R SM

R439

150R SM

R408

22K SM

R414

10K SM

TR409

FMMT497

TR406

FMMT597

R423

22R SM

R421

22R SM

(SET TO 16 mV)

TP402

TP403

TP404

TP405

TP406

TP407

TP408

R437

22R SM

R433

3K3 SM

R435

3K3 SM

R451

10R MF

C416

470P PPW C411

100N PC

+

C418

10U EL

TR421

FMMT597

TR420

FMMT497

+

C402

100U EL 100V

+

C406

100U EL 100V

R452

470R 2W MF 5%

R453

470R 2W MF 5%

BOOTSTRAP

00_1086 JR 19/9/00 NO CHANGE TO THIS SHEET 2.0

00_1115 JR 16/10/00 R438 R439 CHANGED TO 150R

00_1129 JR 1/11/00 R435 R436 C407 C408 VALUE CHANGES

2.1

2.2

+

C403

100U EL

+

C404

100U EL

00_1138 JR 27/11/00 C403 C404 FROM 10U TO 100U 2.3

L400

2U2H LAC SMALL

00_1134 MGM 17/11/00 L300 L400 CHANGED TO 7D002C

2.4

TR422

FMMT497

R454

1K0 SM

R455

6K8 SM

01_1101 JR 6/4/01 POWER SUPPLY FUSES AND DC OFFSET 3.2

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

DRAWING TITLE

Drawn by:

DATE

Filename

ECO No. DESCRIPTION OF CHANGE

J:\ECO_wip\L886 DV88 Display board correct R4 cock-up\L8863\L8863.0a.ddb - L886_3.0a.sch

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

Cambridge CB5 9PB

DVD DISPLAY PCB

Circuit Diagram

L886_3

PG17-Nov-2000

INITIALS

Date Printed

1 1Sheet of

Notes:

SW1

1

SW2

2

SW3

3

SW4

4

SO

5

SI

6

VSS

7

SCK

8

CS

9

K1

10

K2

11

K3

12

K4

13

VDD

14

S1

15

S2

16

S3

17

S4

18

S5

19

S6

20

S7

21

S8

22

S9

23

S10

24

S11

25

S12/G11

26

VEE

27

S13/G10

28

S14/G9

29

S15/G8

30

S16/G7

31

G6

32

G5

33

G4

34

G3

35

G2

36

G1

37

VDD

38

L4

39

L3

40

L2

41

L1

42

VSS

43

OSC

44

Z1

BU2872AK

F1

1

F1

2

G1

5

G2

6

G3

7

G4

8

G5

9

G6

10

G7

11

S1

25

S2

26

S3

27

S4

28

S5

29

S6

30

S7

31

S8

32

S9

33

S10

34

S11

35

S12

36

S13

37

S14

38

S15

39

F2

42

F2

43

DISP1

DISP SSV-07MS09

R1

10K SM

R2

10K SM

R3

10K SM

K3

K4

(was POWER)

(was MENU)

D1

BAS16W SM

D2

BAS16W SM

D3

BAS16W SM

D4

BAS16W SM

SW1

SKIP>

SW2

<SKIP

SW3

PAUSE

SW4

PLAY

SW5

STOP

SW6

OPEN

SW7

FWD>>

SW8

<<RWD

F2F1

G1

G2

G3

G4

G5

G6

G7

SEG8

SEG7

SEG6

SEG5

SEG4

SEG3

SEG2

SEG1

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

K2

Q1

BC856B

Q2

BC847B

R6

1K0 SM

On=Green

Standby=red

+5V

HDCD

+5V

STBLED

R5

470R SM

1

2

3

4

5

6

7

8

SK1

FFC8H SM

1

2

3

4

5

6

SK2

AMPCT6H

SO

SI

SCK

CS

+5V

VKK

+5V

R7

33K SM

+

C5

10U EL SM

+

C6

10U EL SM

+5V

CATHODE BIAS CCT

VKK = -19.5V

F1= -13.9V

F2 = -9.6V

Pwr in

SO

IRIRQ

CS

SCK

SI

DATA I/O

Photo Strip

PS

PHOTO_STRIP

Detail

Drilling

DD2

DRILL_DWG

Paper Marker

A2 Horizontal

DD3

DD_A3H

Paper Marker

A2 Vertical

DD4

DD_A3V

FD_1

FIDUCIAL

FD_2

FIDUCIAL

FIX4

FIXING HOLE

FIX3

FIXING HOLE

FIX2

FIXING HOLE

FIX1

FIXING HOLE

FR4, 1 OZ Cu

PCB MATERIAL

DD1

FR4_1OZ

Q_1

Q_2

Q_3

Q_4

Q_5

Q_6

Q_7

Q_8

Q_9

Q_10

Q_11

Q_12

Q_13

Q_14

Q_23

Q_24

Q_25

Q_26

Q_27

Q_28

Q_29

Q_30

R8

4K7 SM

+5V

Q_18

R

G

LED1

LED RED/GRN 3MM

PCB

L886PB_3

HDCDLED

Q3

BC847B

Q4

BC847B

R10

10K SM

R9

10K SM

R11

10K SM

R12

10K SM

IRIRQ

F2

VKK_CK

VKK_D

R14

4K7 SM

R15

1K0 SM

Q5

BC856B

Q6

BC846B

CLK

3

D

2

SD

4

CD

1

Q

5

Q

6

Z2A

74HC74 SM

VKKIN VKK

+5V

CLK

11

D

12

SD

10

CD

13

Q

9

Q

8

Z2B

74HC74 SM

VCC

14

GND

7

Z2C

74HC74 SM

+5V

R13

1M0 SM

Layout by

Cliff

DD6

CLOGO

Update Box

EL1

UPDATE_BOX

F1

VKKIN

C7

100N SM

C3

100N SM

C2

100N SM

C4

1N0 SM

C8

100N SM

C1

100N SM

LED2

LED GREEN3.1MM

CL 31/07/00 PRODUCTION RELEASE 1.0

R16

1K0 SM

+5V

VKK

D5

BZX284-C5V6

CL 23/08/00 MINOR MODIFICATIONS 2.0

PG00_1082 14/09/00 Change RX1 to l/p part, test pad changes, display clip, R4 VALUE 3.0

VKK switching CCT

Test pad change for issue 3:

Q_23= SO (was STBLED)

Q_9=SI (was GND)

VFD CLIP

E874PM

E882PM

LC1

DVD DISPLAY CLIP

VFD CLIP

E874PM

E882PM

LC2

DVD DISPLAY CLIP

Display clips: PCB footprint is called E882PM

This footprint will accept either E874PM (current clip)

or E882PM (new clip not designed yet)

This part type currently calls for p/n E874PM, change to E882PM when new clip is available

+5V

3

O/P

2

GND

1

Case

O/P

GND +5V

DUAL FOOTPRINT

RX1

SBX1610-52/PIC-26043TM2

IR RX

SUPPORT PAD

SP1

IR RX SUPPORT PAD

PG 17/11/00 Correct error R4 is 1206 not 0805 3.0a

R4

220R SM

1 2 3 4

A

B

C

D

4321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:

DATE

Filename

ECO No. DESCRIPTION OF CHANGE

J:\Change_Control\ECO_AGENDA\01_E014 Fuse changes on A32 preamp\L937_1.1.ddb - Documents\Schematic\L937C1_1.0.PRJ

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

Cambridge CB5 9PB

Integrated amplifier preamp

Circuit Diagram

L937C1

JBR

28-Nov-2001

INITIALS

Date Printed

1 3Sheet of

Notes:

Main signal path

L937C2_1.1.SCH

Power supply

L937C3_1.1.SCH

USE EXCLUDE NF WHEN USING RUNOUT SHEET PROGRAM

PCB

PCB1

L937PB_1

01_1142 JBR 14/8/01 First production release 1.0

01_E014 JBR 28/11/01 Fuses uprated to 2A 1.1

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:

DATE

Filename

ECO No. DESCRIPTION OF CHANGE

J:\Change_Control\ECO_AGENDA\01_E014 Fuse changes on A32 preamp\L937_1.1.ddb - Documents\Schematic\L937C2_1.0.SCH

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

Cambridge CB5 9PB

Integrated amplifier preamp - main signal path

Circuit Diagram

L937C2

JBR28-Nov-2001

INITIALS

Date Printed

2 3Sheet of

Notes:

EMC

1

N

F

SK2A

PHONO4G

C100

1N0 SM

0V_SIG

R100

1K0 SM

R101

1K0 SM

R103

100K SM

R104

100K SM

D100

BAV99W DUAL SM

+15V -15V

0V_SIG

D101

BAV99W DUAL SM

+15V -15V

N

F

SK2B

PHONO4G

0V_SIG

R102

1K0 SM

R125

1K0 SM

R105

100K SM

R128

100K SM

D102

BAV99W DUAL SM

+15V -15V

0V_SIG

D106

BAV99W DUAL SM

+15V -15V

EMC

1

N

F

SK3A

PHONO4G

C121

1N0 SM

0V_SIG

R126

1K0 SM

R127

1K0 SM

R129

100K SM

R130

100K SM

D107

BAV99W DUAL SM

+15V -15V

0V_SIG

D108

BAV99W DUAL SM

+15V -15V

N

F

SK3B

PHONO4G

0V_SIG

R156

1K0 SM

R157

1K0 SM

R159

100K SM

R160

100K SM

D112

BAV99W DUAL SM

+15V -15V

0V_SIG

D113

BAV99W DUAL SM

+15V -15V

EMC

1

N

F

SK4A

PHONO4G

C139

1N0 SM

0V_SIG

R158

1K0 SM

R189

1K0 SM

R161

100K SM

R192

100K SM

D114

BAV99W DUAL SM

+15V -15V

0V_SIG

D115

BAV99W DUAL SM

+15V -15V

EMC

1

N

F

SK5A

PHONO4G

0V_SIG

R190

1K0 SM

R191

1K0 SM

R193

100K SM

R194

100K SM

D116

BAV99W DUAL SM

+15V -15V

0V_SIG

D117

BAV99W DUAL SM

+15V -15V

CD INPUT

TUNER INPUT

AV INPUT

DVD INPUT

TAPE INPUT

VCR INPUT

C160

1N0 SM

0V_SIG

C164

1N0 SM

0V_SIG

R195

1K0 SM

R196

1K0 SM

R197

100K SM

R198

100K SM

D118

BAV99W DUAL SM

+15V -15V

0V_SIG

D119

BAV99W DUAL SM

+15V -15V

EMC

1

N

F

SK6

PHONO2G

AUX INPUT

CD L

CD R

TUNER L

TUNER R

AV L

AV R

DVD L

DVD R

TAPE IN L

TAPE IN R

VCR IN L

VCR IN R

AUX L

AUX R

AUX L

CD L

TUNER L

AV L

DVD L

VCR IN L

MODULE L

0V_SIG

AUX R

CD R

TUNER R

AV R

DVD R

VCR IN R

MODULE R

0V_SIG

TAPE 0

TAPE 1

TAPE 2

TAPE 0

TAPE 1

TAPE 2

+15V

+15V-15V

-15V

0V_SIG

C104

100N SM

C105

100N SM

+15V

-15V

3

2

1

Z109A

TL072 SM

84

Z113C

TL072 SM

R106

1M0 SM

0V_SIG

R108

47R SM

D103

BAV99W DUAL SM

+15V -15V

N

F

SK4B

PHONO4G

0V_SIG

5

6

7

Z109B

TL072 SM

R107

1M0 SM

0V_SIG

R109

47R SM

D104

BAV99W DUAL SM

+15V -15V

3

2

1

Z110A

TL072 SM

R131

1M0 SM

0V_SIG

R133

47R SM

D109

BAV99W DUAL SM

+15V -15V

5

6

7

Z110B

TL072 SM

R132

1M0 SM

0V_SIG

R134

47R SM

D110

BAV99W DUAL SM

+15V -15V

N

F

SK5B

PHONO4G

0V_SIG

+15V

+15V-15V

-15V

C108

100P SM

C109

100P SM

C129

100P SM

C130

100P SM

AUX L

CD L

TUNER L

AV L

DVD L

TAPE IN L

MODULE L

0V_SIG

AUX R

CD R

TUNER R

AV R

DVD R

TAPE IN R

MODULE R

VCR 0

VCR 1

VCR 2

VCR 0

VCR 1

VCR 2

0V_SIG

TAPE OUTPUT

VCR OUTPUT

C106

100N SM

C107

100N SM

+15V

-15V

0V_SIG

C125

100N SM

C126

100N SM

+15V

-15V

0V_SIG

C127

100N SM

C128

100N SM

+15V

-15V

0V_SIG

AUX L

CD L

TUNER L

AV L

DVD L

TAPE IN L

VCR IN L

MODULE L

AUX R

CD R

TUNER R

AV R

DVD R

TAPE IN R

VCR IN R

MODULE R

LISTEN 0

LISTEN 1

LISTEN 2

LISTEN 0

LISTEN 1

LISTEN 2

0V_SIG

C143

100N SM

C144

100N SM

+15V

-15V

0V_SIG

C145

100N SM

C146

100N SM

+15V

-15V

0V_SIG

84

Z114C

TL072 SM

R170

22K SM

R162

22K SM

R171

22K SM

R163

22K SM

R172

22K SM

R164

22K SM

R173

22K SM

R165

22K SM

R174

22K SM

R166

22K SM

R175

22K SM

R167

22K SM

R176

22K SM

R168

22K SM

R177

22K SM

R169

22K SM

+15V

R178

22K SM

C148

22P SM

R179

22K SM

C149

22P SM

5

6

7

Z115B

OPA2134PA SM

5

6

7

Z116B

OPA2134PA SM

84

Z116C

OPA2134PA SM

0V_SIG

R183

1M0 SM

R184

1M0 SM

R199

100K SM

R180

100K SM

0V_SIG

+5V

X0

4

X1

5

X2

6

X3

7

X4

12

X5

11

X6

10

X7

9

EN

2

A0

1

A1

16

A2

15

V-

3

D

8

GND

14

V+

13

Z100

DG408DY

X0

4

X1

5

X2

6

X3

7

X4

12

X5

11

X6

10

X7

9

EN

2

A0

1

A1

16

A2

15

V-

3

D

8

GND

14

V+

13

Z101

DG408DY

X0

4

X1

5

X2

6

X3

7

X4

12

X5

11

X6

10

X7

9

EN

2

A0

1

A1

16

A2

15

V-

3

D

8

GND

14

V+

13

Z102

DG408DY

X0

4

X1

5

X2

6

X3

7

X4

12

X5

11

X6

10

X7

9

EN

2

A0

1

A1

16

A2

15

V-

3

D

8

GND

14

V+

13

Z103

DG408DY

X0

4

X1

5

X2

6

X3

7

X4

12

X5

11

X6

10

X7

9

EN

2

A0

1

A1

16

A2

15

V-

3

D

8

GND

14

V+

13

Z104

DG408DY

X0

4

X1

5

X2

6

X3

7

X4

12

X5

11

X6

10

X7

9

EN

2

A0

1

A1

16

A2

15

V-

3

D

8

GND

14

V+

13

Z105

DG408DY

LIN

4

LGND

5

RGND

12

RIN

13

LMO

2

RMO

15

AVCC

1

DVCC

7

LFO

3

RFO

14

DGND

11

XCS

6

DATA

9

CCLK

10

XMUTE

8

AGND

16

Z107

VSDVC

0V_SIG

C186

100N SM

+5V

+

C154

10U EL

C155

100N SM

C156

100N SM

0V_SIG

+5V

SCLK

SDATA

SLOAD

0V_SIG

R200

2R2 SM

R201

2R2 SM

R202

2R2 SM

0V_SCLK

0V_SLOAD

0V_SDATA

C158

22P SM

C159

22P SM

0V_SIG

SEL1

1

S2

14

D1

2

V+

13

S1

3

S3

11

V-

4

GND

5

VL

12

S4

6

D3

10

D4

7

SEL3

9

D2

15

SEL4

8

SEL2

16

Z106

DG413DY

+15V-15V

0V_SIG

+5V

TONE*

C152

100N SM

0V_SIG

C153

100N SM

R186

47R SM

R187

47R SM

R185

22R SM

+

C157

100U EL

R110

2K2 SM

R111

2K2 SM

+

C110

100U EL

R112

22K SM

0V_SIG

R113

22K SM

+

C111

10U CERAFINE

+5V

3

2

1

Z111A

TL072 SM

5

6

7

Z112B

TL072 SM

3

2

1

Z112A

TL072 SM

5

6

7

Z111B

TL072 SM

84

Z109C

TL072 SM

84

Z110C

TL072 SM

+

C117

10U CERAFINE

R121

22K SM

R119

22K SM

R120

22K SM

+

C116

10U CERAFINE

0V_SIG

D105

BAV99W DUAL SM

0V_SIG

R114

22K SM

R118

22K SM

1618

17

Z108D

DS1844

1519

14

Z108A

DS1844

R115

2K7 SM

R116

2K7 SM

0V_SIG

R117

5K6 SM

R135

2K2 SM

R136

2K2 SM

+

C131

100U EL

R137

22K SM

0V_SIG

R138

22K SM

+

C132

10U CERAFINE

+5V

3

2

1

Z113A

TL072 SM

5

6

7

Z114B

TL072 SM

3

2

1

Z114A

TL072 SM

5

6

7

Z113B

TL072 SM

+

C138

10U CERAFINE

R146

22K SM

R144

22K SM

R145

22K SM

+

C137

10U CERAFINE

0V_SIG

D111

BAV99W DUAL SM

0V_SIG

R139

22K SM

R143

22K SM

62

7

Z108B

DS1844

53

4

Z108C

DS1844

R140

2K7 SM

R141

2K7 SM

0V_SIG

R142

5K6 SM

84

Z111C

TL072 SM

84

Z112C

TL072 SM

+15V

-15V

C169

100N SM

C168

100N SM

C172

100N SM

C173

100N SM

C176

100N SM

C177

100N SM

C180

100N SM

C181

100N SM

0V_SIG 0V_SIG 0V_SIG 0V_SIG

C170

100N SM

C171

100N SM

C174

100N SM

C175

100N SM

C178

100N SM

C179

100N SM

C182

100N SM

C183

100N SM

C184

100N SM

C185

100N SM

0V_SIG 0V_SIG 0V_SIG 0V_SIG 0V_SIG

PS

1

R/W

8

DOUT

11

RST

9

DIN

12

CLK

13

VCC

20

GND

10

Z108E

IC DS1844

+5V

SDATA

SCLK

TONEID

C118

100N SM

+

C120

10U EL

0V_SIG

C119

10N SM

R122

2R2 SM

0V_TONEID

C115

22P SM

C136

22P SM

0V_SDATA

0V_SCLK

R124

2R2 SM

R123

2R2 SM

R151

22K SM

R147

22K SM

R152

22K SM

R148

22K SM

R153

22K SM

R149

22K SM

R154

22K SM

R150

22K SM

R155

22K SM

LISTEN 0

LISTEN 1

LISTEN 2

VCR 0

VCR 1

VCR 2

TAPE 0

TAPE 1

TAPE 2

TONE*

0V_TONEID

TONEID

0V_SDATA

SDATA

0V_SLOAD

SLOAD

0V_SCLK

SCLK

1

2

3

4

SK102

AMPCT4

0V_SIG

1

2

3

4

5

6

7

8

SK103

AMPCT8

+15V

0V_SIG

-15V

AUX R

AUX L

TO PHONO PCB

TO POWER AMP I/P

TO MICRO / DISPLAY PCB

3

2

1

Z115A

OPA2134PA SM

3

2

1

Z116A

OPA2134PA SM

3

2

1

Z117A

OPA2134PA SM

5

6

7

Z117B

OPA2134PA SM

84

Z115C

OPA2134PA SM

84

Z117C

OPA2134PA SM

RLY100A

RLY DPDT 5V SM

RLY100B

RLY DPDT 5V SM

+

-

RLY100C

RLY DPDT 5V SM

D120

BAS16W SM

Q100

BC849B

R203

4K7 SM

MUTE*

0V_D

+5V

MUTE*

0V_D

+

C187

10U EL

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

SK101

FFC30V SM

0V_MODULE

AUX L

AUX R

CD L

CD R

TUNER L

TUNER R

AV L

AV R

DVD L

DVD R

TAPE IN L

TAPE IN R

VCR IN L

VCR IN R

MODULE L

MODULE R

TO PLUG IN MODULE PCB

+5V

R188

10K SM

0V_SIG

0V_HF

D121

BAV99W DUAL SM

D122

BAV99W DUAL SM

+15V -15V

C113

470N PE

C134

470N PE

C150

470N PE

C151

470N PE

+

C188

10U EL

+

C189

10U EL

+15V

-15V

0V_SIG

+

C190

10U EL

+

C191

10U EL

+15V

-15V

0V_SIG

R204

10K SM

C112

470N PE

C192

470N PE

C133

470N PE

C193

470N PE

C101

470P FKP2

C102

470P FKP2

C103

470P FKP2

C122

470P FKP2

C123

470P FKP2

C124

470P FKP2

C140

470P FKP2

C141

470P FKP2

C142

470P FKP2

C161

470P FKP2

C162

470P FKP2

C163

470P FKP2

C165

470P FKP2

C166

470P FKP2

C114

CFKP2 63V 2N2

C135

CFKP2 63V 2N2

CDL1 CDL

CDR

CDR1

TUNL1

TUNR1

TUNL

TUNR

AVL1

AVR1

AVL

AVR

DVDL1

DVDR1

DVDL

DVDR

TAPEIL1

TAPEIR1

TAPEIL

TAPEIR

VCRIL1

VCRIR1

VCRIL

VCRIR

AUXL

AUXR

+15V1

-15V1

AUXL1

AUXR1

LISTEN2

LISTEN1

LISTEN0

LIST2

LIST1

LIST0

VCR2

VCR1

VCR0

VCR21

VCR11

VCR01

TAPE2

TAPE1

TAPE0

TAP2

TAP1

TAP0

TAPEO1

TAPE02

VCRO1

VCR02

Z115_1A

Z116_1A

/TONE

Z107_4

Z107_13

Z107_1

SK102_1

SK102_3

Z116_1B

Z113_3

Z111_3

Z115_1B

Z111_1

Z111_7

Z108_19

Z112_3

Z112_1

Z112_7

TONEID

SDATA

SCLK

Z106_11Z114_7

Z114_1

Z114_3

Z108_3

Z113_7

Z113_1

AUXIL1

AUXIR1

Z106_14

+15V2

-15V2

R182

100R SM

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

SK100

FFC22V1MM

C147

100N PE

C167

100N PE

01_1142 JBR 14/8/01 First production release 1.0

R181

10K SM

01_E014 JBR 28/11/01 Fuses uprated to 2A 1.1

1 2 3 4

A

B

C

D

4321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:

DATE

Filename

ECO No. DESCRIPTION OF CHANGE

J:\Change_Control\ECO_AGENDA\01_E014 Fuse changes on A32 preamp\L937_1.1.ddb - Documents\Schematic\L937C3_1.0.SCH

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

Cambridge CB5 9PB

Integrated amplifier preamp - power supply

Circuit Diagram

L937C3

JBR

28-Nov-2001

INITIALS

Date Printed

3 3Sheet of

Notes:

1

2

3

4

SK300

MOLEXPWR4

+

C300

1000u 35V

+

C310

1000u 35V

D302

BAS16W SM

D308

BAS16W SM

Vin

I

ADJ

A

Vout

O

Z301

LM317T

D305

BAS16W SM

D304

BAS16W SM

R303

470R SM

+

C305

10U EL

C304

100N SM

R302

1K2 SM

R307

220R SM

+15V

-15V

+5V

0V_PSU

SP300

STAR POINT 4

0V_PSU

0V_SIG

0V_HF 0V_MODULE

+

C306

470U EL 25V

C307

470N PE

C308

100N SM

C309

100N SM

Q301

2SC5248

Q305

2SA1964

+

C302

220U EL

+

C312

220U EL

Q300

J112

Q303

J112

R300

330R SM

R304

330R SM

+

C303

3300u 25V

+

C313

3300u 25V

D310

15V 350MW SM

D311

15V 350MW SM

Q306

BC846B

Q307

BC856B

1

2

3

4

SK301

IDC4S

+15V

-15V

0V_PSU

0V_MODULE

AC1

AC2

UR+

UR-

D311-

D310+

+15V3

+5V

+3.75V

0V_SIG

-15V3

C314

1N0 PP

C315

1N0 PP

D300

S1D

D301

S1D

D306

S1D

D307

S1D

01_1142 JBR 14/8/01 First production release 1.0

01_E014 JBR 28/11/01 Fuses uprated to 2A 1.1

F300

T2A SM

F301

T2A SM

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:

DATE

Filename

ECO No. DESCRIPTION OF CHANGE

J:\Completed_Projects\A85 (Mary)\mary display\L865_2\l865_2.0 dbase.ddb - Documents\L865_2.0.PRJ

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

Cambridge CB5 9PB

MARY AMP DISPLAY PCB

Circuit Diagram

L865C1

JBR

8-Jan-2002

INITIALS

Date Printed

1 2Sheet of

Notes:

L865C2_2.0

L865C2_2.0.SCH

FIX7

FIXING HOLE

FIX2

FIXING HOLE

FIX10

FIXING HOLE

FIX4

FIXING HOLE

FIX5

FIXING HOLE

FIX6

FIXING HOLE

FIX1

FIXING HOLE

FIX8

FIXING HOLE

FD_1

FIDUCIAL

FD_2

FIDUCIAL

A85 DISPLAY PCB

MICRO

PCB

PCB1

L865PB_2

Update Box

(Small)

UDB

UPDATE_SML

FIX9

FIXING HOLE

FIX3

FIXING HOLE

FIX11

FIXING HOLE

CHASSIS 1

CHASSIS 2

CHASSIS 3

(BY SK3)

(BY SK1)

(BY SK2)

C39

1N0 SM

C45

1N0 SM

C40

1N0 SM

C41

1N0 SM

C42

1N0 SM

C43

1N0 SM

C44

1N0 SM

C46

1N0 SM

C47

1N0 SM

C49

1N0 SM

C48

1N0 SM

0V_D

0V_D 0V_D 0V_D 0V_D 0V_D

0V_D0V_D

0V_D

ISSUE 1.1

00_1103 JBR SW1 TO SW10 CHANGED29 SEP 2000 1.1

EDD IR DUAL FOOTPRINT ADDED19/07/2001 2.0

1 2 3 4 5 6 7 8

A

B

C

D

8

7

6

5

4

3

2

1

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:

DATE

Filename

ECO No. DESCRIPTION OF CHANGE

J:\Completed_Projects\A85 (Mary)\mary display\L865_2\l865_2.0 dbase.ddb - Documents\L865C2_2.0.SCH

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

Cambridge CB5 9PB

MARY AMP DISPLAY PCB

Circuit Diagram

L865C2

JBR

8-Jan-2002

INITIALS

Date Printed

2 2Sheet of

Notes:

Vcc

1

PB0

2

PB1

3

PB2

4

PB3

5

PB4

6

PB5

7

PB6

8

PB7

9

Vpp/RESO

10

Vss

11

TxD0/P9.0

12

TxD1/P9.1

13

RxD0/P9.2

14

RxD1/P9.3

15

IRQ4/SCK0/P9.4

16

IRQ5/SCK1/P9.5

17

D0/P4.0

18

D1/P4.1

19

D2/P4.2

20

D3/P4.3

21

Vss

22

D4/P4.4

23

D5/P4.5

24

D6/P4.6

25

D7/P4.7

26

D8/P3.0

27

D9/P3.1

28

D10/P3.2

29

D11/P3.3

30

D12/P3.4

31

D13/P3.5

32

D14/P3.6

33

D15/P3.7

34

Vcc

35

A0/P1.0

36

A1/P1.1

37

A2/P1.2

38

A3/P1.3

39

A4/P1.4

40

A5/P1.5

41

A6/P1.6

42

A7/P1.7

43

Vss

44

A8/P2.0

45

A9/P2.1

46

A10/P2.2

47

A11/P2.3

48

A12/P2.4

49

A13/P2.5

50

P2.6/A14

51

P2.7/A15

52

P5.0/A16

53

P5.1/A17

54

P5.2/A18

55

P5.3/A19

56

Vss

57

P6.0/WAIT

58

P6.1/BREQ

59

P6.2/BACK

60

CLKOUT

61

STBY

62

RES

63

NM1

64

Vss

65

EXTAL

66

XTAL

67

Vcc

68

P6.3/AS

69

P6.4/RD

70

P6.5/HWR

71

P6.6/LWR

72

MD0

73

MD1

74

MD2

75

AVcc

76

Vref

77

P7.0/AN0

78

P7.1/AN1

79

P7.2/AN2

80

P7.3/AN3

81

P7.4/AN4

82

P7.5/AN5

83

P7.6/AN6/DA0

84

P7.7/AN7/DA1

85

AVss

86

P8.0/IRQ0

87

P8.1/IRQ1

88

P8.2/IRQ2

89

P8.3/IRQ3

90

P8.4/CS0

91

Vss

92

PA0

93

PA1

94

PA2

95

PA3

96

PA4

97

PA5

98

PA6

99

PA7

100

H8/3048F

Z1

H8/3048F

Gnd

1

Res

2

Vcc

3

DS1233

Gnd

4

Z2

DS1233 SM

R1

10K SM

R2

10K SM

R3

10K SM

R4

10K SM

R5

10K SM

R6

10K SM

R7

10K SM

R8

10K SM

R9

10K SM

R10

10K SM

R11

10K SM

R12

10K SM

R13

10K SM

R14

10K SM

R15

10K SM

R16

10K SM

0V_D

SW12 SW11

TACTSW SM

SW13

TACTSW SM

SW14

TACTSW SM

SW15

TACTSW SM

SW16

TACTSW SM

R17

1K5 SM

R18

1K5 SM

R19

1K5 SM

R21

1K5 SM

R22

1K5 SM

R25

1K5 SM

BUT1

BUT2

BUT3

BUT4

BUT5

BUT6

BUT7

BUT8

BUT9

BUT10

BUT11

BUT12

BUT13

BUT14

BUT15

BUT16

0V_D

C1

18P SM

C2

18P SM

Programming adaptor

+5V

0V_D

+5V

D2

BAS16W SM

+5V

R26

10K SM

+5V

IND1

IND2

IND3

IND4

IND5

IND6

IND7

IND8

IND9

IND10

0V_D

+5V

R27

10K SM

R2810K SM

R34

150R SM

R33

330R SM

0V_D

+5V

0V_D

+5V

To preamp board

SEL1

SEL2

SEL3

SEL4

SEL5

SEL6

SEL7

SEL8

SEL9

LEFTAUDIO

MUTE

TONE

TONEID

SDATA

SLOAD

SCLK

0V_D

PHASEA

PHASEB

+5V

PHASEA

PHASEB

+5V

0V_D

A0

1

A1

2

A2

3

VSS

4

SDA

5

SCL

6

WP

7

VDD

8

Z5

24C02 SM

0V_D

R32

10K SM

+5V

DISPCLK

DISPDAT

DISPCLK

0V_D

F1 to F2 = 4Vac 150mA

VDD2 = 40Vdc 20mA

+5V

DISPLAT

DISPBLK

3

2

1

Z6A

LM393A SM

5

6

7

Z6B

LM393A SM

84

Z6C

LM393A SM

C3

100N SM

C4

100N SM

0V_D

C5

100N SM

0V_D

DISPBLK

DISPLAT

BUT9

BUT8

BUT7

BUT6

BUT2

IND3

BUT3

BUT1

IND1

BUT5

IND2

BUT4

IND12

IND11

BUT16

IND6

BUT15

IND5

BUT10

IND7

BUT12

IND9

BUT14

IND4

BUT11

IND8

BUT13

C6

100N SM

C7

100N SM

C8

100N SM

C9

100N SM

C10

100N SM

0V_D

+5V

R35

10K SM

R36

10K SM

R37

10K SM

R38

1K2 SM

R39

2K2 SM

R40

4K7 SM

+5V

0V_D

+

C11

10U EL SM

R41

100K SM

R42

100K SM

0V_D

+5V

R43

100K SM

R44

100K SM

3

2

1

Z7A

LM393A SM

5

6

7

Z7B

LM393A SM

84

Z7C

LM393A SM

0V52V7

2V7

0V5

3

2

1

Z8A

LM393A SM

5

6

7

Z8B

LM393A SM

84

Z8C

LM393A SM

R45

10K SM

R46

1K2 SM

R47

4K7 SM

0V5

2V7

+5V

0V_D

R480R0 SM

SCLK

SLOAD

SDATA

TONEID

SEL1

SEL2

SEL3

SEL4

SEL5

SEL6

SEL7

SEL8

SEL9

MUTE

TONE

+

C14

10U EL SM

C15

100N SM

0V_D

C16

100N SM

1

2

3

4

5

SK2

AMPCT5

SAMTX2

SAMRX2

SAMTX2

SAMBUSYSAMDATA

+5V

0V_D

IND10

C17

100N SM

0V_D

D3

BAS16W SM

R55

10K SM

+5V

VFD_VDD2

3

2

1

Z11A

AD8532 SM

5

6

7

Z11B

AD8532 SM

84

Z11C

AD8532 SM

C25

100N SM

DCPROT

VIPROT

F1CLOCK

F2CLOCK

STANDBY

SP1ON

SP2ON

THERMPROT

+5V

0V_D

F1CLOCK

F2CLOCK

Vin

I

GND

G

Vout

O

Z12

7815

C27

100N SM

+SUP VFD_VDD2

+

C28

10U EL SM

0V_D

R56

10K SM

R57

10K SM

Q_19

Q_20

D5

BAS16W SM

R58

0R0 SM

R59

0R0 SM

R64

100R SM

R65

100R SM

R66

100R SM

R67

100R SM

C31

10P SM

C32

10P SM

0V_D

R49

10K SM

R50

10K SM

+5V

SAMHOLD

R51

100R SM

Q_54

R20

1K5 SM

R23

1K5 SM

R24

1K5 SM

R31

1K5 SM

R

G

LED11

LED RED/GRN 3MM

Q1

BC847B

Q2

BC847B

R29

10K SM R30

10K SM

0V_D

IND11

IND12

ISSUE 1.1

R68

10K SM

BUT17

0V_D

+5V

+SUP

STANDBY

SP1ON

SP2ON

THERMPROT

VIPROT

DCPROT

ACPRESENT

0V_D

R69

2R2 SM

R70

2R2 SM

R71

2R2 SM

R72

2R2 SM

0V_D

IRIN

Q3

BC847B

Q4

BC847B

R73

10K SM

R74

10K SM

R75

10K SM

R76

10K SM

0V_D

+5V

IRIN

IROUT

C12

100N SM

(FIT CLOSE TO SK1)

+5V

0V_D

+

C33

220U EL

+

C34

220U EL

SAMDATA

SAMBUSY

IRIN

C

3

B

2

A

1

4

5

SW18

ALPS_ENCODER

SW17

A1506

D4

22V 350MW SM

LED7

LED GREEN3.1MM

LED8

LED GREEN3.1MM

LED6

LED GREEN3.1MM

LED3

LED GREEN3.1MM

LED10

LED GREEN3.1MM

LED9

LED GREEN3.1MM

LED1

LED GREEN3.1MM

LED4

LED GREEN3.1MM

LED2

LED GREEN3.1MM

LED5

LED GREEN3.1MM

RECEIVE

TRANSMIT

RECEIVE

RESPIN

PB0

VPROG

1

2

3

4

5

6

7

8

9

10

11

12

13

14

SK1

FFC 14W 2.54MM HOR

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

SK3

FFC 22W 1MM HOR

To power amp / PSU

0V_D

C50A 100PX4 SM

C50B 100PX4 SM

C50C 100PX4 SM

C50D 100PX4 SM

C51A 100PX4 SM

C51B 100PX4 SM

C51C 100PX4 SM

C51D 100PX4 SM

C52A 100PX4 SM

C52B 100PX4 SM

C52C 100PX4 SM

C52D 100PX4 SM

C53A 100PX4 SM

C53B 100PX4 SM

C53C 100PX4 SM

C53D 100PX4 SM

C54A 100PX4 SM

C54B 100PX4 SM

C54C 100PX4 SM

C54D 100PX4 SM

C55A 100PX4 SM

C55B 100PX4 SM

CHASSIS 1

C60A 100PX4 SM

C60B 100PX4 SM

C60C 100PX4 SM

C60D 100PX4 SM

C61A 100PX4 SM

C61B 100PX4 SM

C61C 100PX4 SM

C61D 100PX4 SM

C62A 100PX4 SM

C62B 100PX4 SM

C62C 100PX4 SM

C62D 100PX4 SM

C63A 100PX4 SM

C63B 100PX4 SM

CHASSIS 2

+

C29

100U EL SM

R52

100R SM

R53

100R SM

LEFTAUDIO

+

C26

10U EL SM

C55C 100PX4 SM

C55D 100PX4 SM

C63C 100PX4 SM

C63D 100PX4 SM

X1

16MHZ SM

F1

1

F1

2

F1

3

SIN

4

VDD1

5

SOUT

6

LAT

7

BLK

8

CLK

9

VSS

10

VSS

11

VDD2

12

F2

15

F2

16

F2

17

Graphics Display

DISP1

B1013

12

34

56

78

910

1112

1314

SK4

HEADER 7X2HORIZ

STICKY PAD

DOUBLE SIDED

10 X 15MM

SP1

STICKY PAD DS 10X15MM

STICKY PAD

DOUBLE SIDED

10 X 15MM

SP2

STICKY PAD DS 10X15MM

Q_122

Q_123

Q_124

Q_125

Q_126

Q_127

Q_128

Q_129

Q_120

Q_119

Q_118

Q_117

Q_121

SW6

A1509

SW8

A1509

SW7

A1509

SW1

A1509

SW4

A1509

SW2

A1509

SW5

A1509

SW3

A1509

SW9

A1509

SW10

A1509

00_1103 JBR 29 SEP 2000 SW1 TO SW10 CHANGED

+5V

3

O/P

2

GND

1

Case

O/P

GND +5V

RX1

SBX1610-52/PIC-26043TM2

DISPLAY CRADLE

E916PM

DC1

DISPLAY CRADLE E916PM

DISPLAY CRADLE

E916PM

DC2

DISPLAY CRADLE E916PM

EDD IR DUAL FOOTPRINT ADDED19/07/2001 2.0

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:

DATE

Filename

ECO No. DESCRIPTION OF CHANGE

G:\DATA\ECO\ECO AGENDA\01_1070 l870 A85 PHONO ISSUE2\L870_2.0.ddb - L870c1_2.0.PRJ

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

Cambridge CB5 9PB

A85 PHONO STAGE - TOP LEVEL

Circuit Diagram

L870C1

JBR23-Apr-2001

INITIALS

Date Printed

1 3Sheet of

Notes:

1

EMC

SK1

PHONO2HG

0V_SIG

LEFT IN LEFT OUT

LEFT CHANNEL

L870C2_2.0.SCH

RIGHT IN RIGHT OUT

RIGHT CHANNEL

L870C3_2.0.SCH

1

2

3

4

5

6

7

8

SK2

AMPCT8

+15V

-15V

0V_HF0V_SIG

Q_1

Q_2

Q_3

Q_4

Q_5

Q_6

Q_7 Q_8

PCB

PCB1

L870PB_2

Update Box

EL1

UPDATE_BOX

C1

100N CD

00_1051 JAG 22/3/01 PRODUCTION ISSUE 1

01_1070 JAG 17/4/01 updated pcb and scm 2

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Arcam A85 User manual

Arcam A85 User manual

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