Altec 9860A Operating Instructions Manual

..------ NOTICE ------,

Read this manual before operating

the ALTEC 9860A Active Equalizer.

ALTEC.

FEATURES

9860A

ACTIVE EQUALIZER

OPERATING

INSTRUCTIONS

• 26 Band-Rejection Filters - l/3 Octave, ISO Center

Frequencies (40 Hz to 12 .5 kHz)

• High-Pass and Low-Pass Filters with Controls

• Front Panel Gain Control

• Transformer-Coupled Inputs and Outputs

• Hinged Front Cover Prevents Tampering with Controls

• Bypass Switch

• AC or Battery Operation

• Modular PCB Construction

• Underwriters' Laboratories Listed

Specifi.cations and romponents s11l,jc,·t to channc wit ho11t

notice. Overall 11erf or11rn nee will lie 1naintninr'd or im.proved.

1515 S. Manchester Ave., Anaheim, Calif. 92803

SOUND PRODUCTS DIVISION

DATA CONTENTS

Item Page Graphics

Title

Page

SPECIFICATIONS 3

Figure l

Typical Resp_onse Curves for Various

Filter Settings

5

DESCRIPTION 4

Figure 2

Electrical Connections

6

MODIFYING THE 9860A ACTIVE EQUALIZER

FOR LOW-LEVEL SIGNAL APPLICATION S 4

Figure 3

Bottom View 9860A,

Cover Removed

6

MODIFYING THE 9860A ACTIVE EQUALIZER

FOR USE WITH 8080A PINK NOISE GENERATOR 4

Figure 4

Converting to 240V ac,

50/ 60 Hz Power

7

INSTALLATION 6

Figure 5

Input and Output Conne ctions

7

MECHANICAL 6

Figure 6

Front View 9860A, Hinged Pane l

VENTILATION 6

Cover Open

8

ELECTRICAL 6

Table I

Control and Indicator Functions

8

120V ac, 50/ 60 Hz Power Connection s 6

240V ac, 50/60 Hz Power Connection s 6

Battery Connection s 7

Figure 7

Typical Sound System Response

Curve Before Equa I izati on

9

Input Connections 7

Output Connection s 7

Figure 8

Typical Sound System Response

Curve After Equalizatio n

9

OPERATION 8

Figure 9

Control Settings Record

9

CONTROLS AND IN DICATORS 8

Figure 10

Top View 9860A, Cover Removed

11

Use of Equalizer Controls 8

Figure 11

Schematic (2D700-6),

SERVICE 10

9860A Active Equalizer

14

ACCESS 10

Cover Removal l 0

Control Pane l Assembly Removal 10

Figure 12

Schematic (2C693-l), Low/Mid

Frequency Potentiometer PCB

Assembly

15

PARTS REPLACEMENT l 0

Figure 13

Schematic (2C694- l), High

Frequency Potentiometer PCB

Fuse Replacement l 0

Assembly

15

Input and Output Transformer Replacement 10

Pilot Indicator Replacement 10

Power Transistor Replacement 10

Figure 14

Schematic (2D697-2), Low

Frequency Fi I ter PCB Assembly

16

Printed Circ uit Board (PCB) Replacem ent l 0

Figure 15

Schematic (2D698-2), Mid

l . Control PCB Replacement 11

Frequency Filter PCB Assembly

17

2 . Filter PCB Replacement 11

3. Potent iometer PCB Replacement 11

Figure 16

Schematic (2D699-3), High

Frequency Filter PCB Assembly

18

APPENDIX A 13

Figure 17

Schematic (2D701-5),

Control

PROCEDURE TO MODIFY 9860A FOR LOW-

PCB Assembly

19

LEVEL SIGNAL APPLICATIONS 13

APPENDIX B 13

PROCEDURE TO MODIFY 9860A FOR USE

WITH 8080A PINK NO ISE GENERATOR 13

PARTS LIST 20

MAIN CHASSIS 20

- 2 -

SPECIFICATIONS

Type:

Act ive 1/3-octove equalizer with 26

band-rejection filters

Operating Gain: -3 dB

Available Gain: 20 dB (to restore equa lization loss)

Input Level : +18 dBm max imum

Power Output: + 15 dBm

Frequenc y Response: ± l dB from 20 Hz to 20 kHz

Distortion:

Input Impedance:

Load Impedance :

Noise Leve I:

Controls:

Less than 0.5 % total harmonic distor-

tion (THD)at rated output and restored

gain

15<.x-2 or 6000, balanced input

15<.x-2 or 6000, balanced output

82 dB below roted output

26 detented linea r slide filter controls

on 1/3 -oc tove I SO centers 40 Hz

through 12 .5 kHz. 15 dB depth each

center frequenc y, combining with ad-

jac ent filters at - 7 dB.

- 3 -

Control s (co ntinued): l detented linear slide reinsertion

GAIN control

Pilot Indicator:

2 four-posi tion interlocked pushbutton

switches:

HIGH PASS; OFF/ 40 Hz/ 80 Hz/

160 Hz; 18 dB/ octave rolloff

LOW PASS; OFF/ 6 kHz/ 12.5 kHz/

16 kHz; 18 dB/ octave rolloff

l push/ push BYPASS switch

Light -emitting diode

Power Requirements: l20 / 240V oc, 50/ 60 Hz , 35W

Operating

Temperature Range:

Dimensions:

Weight:

Color :

-or-

24/ 28V de at 1A

Up to 50°C (122°F)

5-l/4"H x 19"W x 8"D

17 poun ds

AL TEC Green on panel cover, black

matte finis h on inner panel

DESCRIPTION

TheALTEC9860A Active Equa lizer is anAcousta- Voicing® *

filter set equipped with 26 active, band-rejecti on filt ers and

additional high/ low pass filter selection to accu rate ly equal-

ize the entire audio spectr um of one sound system channel.

The 9860A enables adjustment of the sound system so that the

loudspeaker and encl osed- room environment provide a flat

acoustical response for the listener's ear. Interna l gain cor-

rection restores the equali zed output to the original input

level.

Typical response curves for various filter settin gs are shown

in Figure 1.

MODIFYING THE 9860A ACTIVE EQUALIZER FOR

LOW-LEVEL SIGNAL APPLICATIONS

The9860AActiveEqua lizer is designed to operat ew ithanom-

inal input level of about +4 dBm. In many studio monitoring

situations, however, leve ls as low as -12 or -1 4 dBm are en-

countered at the monitor bus outputs, and drivin g the 9860A

at those levels degrad es the signal-to-noise capa bilities of the

device.

*The exclusive Altec Acousta-Voicing ® proc ess is patented

under Pat. No. 3,62 4, 298.

- 4 -

The 9860A is equipped with 15356A input and output transfor-

mers. These are 600/ 600-ohm device s and are used for isola-

tion only. If the 15095A transformers are used instead, the

600/15,000-ohm impedance transformation provides a 13 dB

voltage advan tage going into the equali zer circuitry, and

consequently that much more signal-to-noi se ratio.

Refer to Appendix A for the necessary modification procedure.

,---------NOTE---------,

After modification, clipping of input signal will

result for input levels exceeding approximately

+5 dBm.

MODIFYING THE 9860A ACTIVE EQUALIZER FOR USE

WITH 8080A PINK NOISE GENERATOR

Substitution of the 8080A Pink Noise Gener ator for the norma I

input transformer of the 9860A provides great flexibility in

tailoring a noise source to thedesiredspect ruminawiderange

of environmen ts.

Refer to Appendix B for the necessary modification procedure.

9860A

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FREQUENCY IN HERTZ

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26 l/3 Octave-Centered Filters at Maximum

Attenuation (-14 dB). Each Section

Plotted Independently

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FREQUENCY IN HERTZ

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Single Filter, 1 kHz, Shown in Each Detented

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FREQUEN CY IN HERTZ

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High-Pass and Low-Pass Functions (18 dB/ oct}

Plotted Indep endently

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2 3 4567891 3 456789 1

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FREQUENCY IN HERTZ

3 45 6 789 1 2

20 100

10000 20000

All Filter Sections Set at -7 dB Attenuation

lllusrrating Slight Degree of "Ripple"

(± l/2 dB} Characteristic of Proper

Interaction Between Sections

a,

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FREQUENCY IN HERTZ

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Al I Fi I ter Sections Set for Fu 11 Attenuation

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20 100

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FREQUE NCY IN HERTZ

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3 4 567891 2

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Two Adjacent Filters, 1 kHz and 1250 Hz,

Set for Ful I Attenuation

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20 100

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FREQUEN CY IN HERTZ

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kHz Filter Set at -14 dB, 800 and 1250 Hz

Filters Set at -8 dB

Figure 1. Typica l Response Curves for Various Filter Settings

- 5 -

INSTALLATION

MECHANICAL

The 9860A may be mounted in a standard 19-in c h equipment

rack. Vertical rack space required is 5-1/4 inches. Use the

following procedure:

Step l. Remove four screw s securing front cove r; open and

lower cover .

Step 2. Install 9860A in equipment rack with a ppropriat e

four screws supplie d with unit.

Step 3. Close front cover and secure with four scre ws previ-

ously remove d .

VEN TILATION

The 9860A generates minim a l heat during normal use . A l-

though the amount of heat is re lati ve ly low, th e unit must be

vent ilated to prevent exces sive tempera ture rise. Becau se

transistors are heat sensitive, the 9860A should not be placed

adiacent to heat-generating equipment or in ar eas where am-

bient temperature exceeds 50°C (122°F).

If the 9860A is mounted in an equipment rack or cab inet with

other heat-producing equipm e nt mounted abo ve and / or be low

(two or more 9860A 's or one 9860A with real t ime ana lyzer,

oscilloscope, etc.), space must be provided betwe en the units

or the 9860A may become too warm. A 1-3/ 4" perforated

panel is recommended for thi s purpose.

J.C UNE

i

IATTERY

:u. v.o

-

lfl' LACt WITH THE SA.ME TYPE fUSE

EXT IATT

GND

♦

2

4V

When severa I 9860A 's or other heat- producing units are

mounted in a sing le rac k or cab inet, acc eptab le air tempera-

ture may be in doubt. To determine tem perature cond i ti ans,

operate the system until temperatures stab ilize, then measure

air temperature with a bulb-type ther mometer held at the

bottom of the uppermost 9860A. Do not let the thermometer

bu lb touch metal because the metal wil l probably be hotter

than the amb ient air. If air temperature could exceed 50°C,

the equipment shou ld be spaced furthe r apart or a blower

shou ld be insta lled to venti lat e the cabin e t.

ELECTRICAL

120V ac, 50/ 60 Hz Power Connections

Equipment supp lied for domestic use is provided with the

power transfo rmer strapped for 120 vo lts (terminals 2 to 3 and

4 to 5 on TB4). The power input name p late on the chassis

adiacent to the power cord is mounted to show the appropri-

ate side specifying the connections (see Figure 2). Verify

that line vo ltage is in accordance with the vo ltag e rating

before connecting the 9860A to line powe r .

240V ac, 50/ 60 Hz Power Connections

Export eq uip ment, specified, is provid ed with the power

transformer strapped for 240 vo lts (termi na ls 3 to 4 on TB4).

The power input namep lat e on the chas sis adiacent to the

power cord is mounted to show the appropr ia te side specifying

the connect ions. Use the following pro cedure to change a

unit strapped for 120V operation to 240V operation:

C\ASS II wtMNG MAY Ill USED

Figure 2. Electrical Connections

POWER TRANSISTOR (Q l)

POWER TERMINAL BOARD (TB4)

Figur e 3 . Bottom View 9860A, Cover Removed

- 6 -

240V ac, 50/ 60 Hz Power Connections (continu ed}

Step l . Remove seven screws securing bottom cover; I ift off

cover.

Step 2. Locate terminal board TB4 beneath power trans-

former T3.

Step 3. Remove strap "A" connecting terminals 2 and 3, and

remove strap "B" connec ting terminals 4 and 5; then

solder strap "C" to terminals 3 and 4 (see Figures 3

and 4).

Step 4. Remove voltage rating nameplate from chassis, re-

verse and reinstall to show 240V rating.

Step 5. Replace bottom cover and secure with seven scre ws

previously removed.

Step 6. Change ac line fuse (Fl) from the existing lA fuse

to a l/2A fuse (see Figure 2). Place a l/2A ac line

rating tag on tag on the back of the 9860A, abo ve

the AC LINE fuse.

BRN/WHT

REMOVE STRAPS "A" AND "B"

INSTALL STRAP "C"

BLK

GRN

WHT

El

Wl

Figure 4. Converting to 240V ac, 50/ 60 Hz Power

Battery Connections

If desi red, the 9860A may be connected to an external

24/ 28V battery with minus (-) as ground. Terminals for the

de power connections are on TB3 (see Figures 2 and l l ). If ac

power foils, transfer to de power is instantaneous, automatic

and silent.

-7-

Input Connections

Input to the 9860A is connected to the INPUT terminal board

(TB l} on the rear pane I of the chassis (see Figures 2, 5 and

l l}. Connections to AL TEC power amp I ifiers must be made

with two-conductor, twisted and shielded cable, such as

Belden 8450 or 8451 cable.

------NOTE

For amp I ifier connections, refer to

operating instructions for associated

ALTEC amplifier.

For 600-ohm balanced input applications with 9860A, con-

nect amplifier to terminals land 4 of TBl and strap terminals

2 and 3 (see Figure 5). Terminals 4 (common} and 5 (ground}

may also be strapped to prevent interference from stray elec-

trostatic radiation.

For 150-ohm balanced input applications with the 9860A,

connect amplifier to terminals 1 and 4 of TB] and strap ter-

minals l to 2 and 3 to 4 (see Figure 5). Terminals 4 and 5

may also be strapped to pre vent interference from stra y elec-

trostatic radiation.

Output Connections

Output from the 9860A is connected to the OUTPUT terminal

board (TB2) on the rear panel of the chassis (see Figures 2, 5

and 11). Terminal connections and cable requirements are

the same as described for input connections.

2

TB2

OUTPUT

3 4

5

TBI

INPUT

3

4

CONNECTIONS FOR 600 OHMS BALANCED INPUT AND OUTPUT

2

TB2

OUTPUT

3

4

5

2

TBI

INPUT

3

4

CONNECT IONS FOR 150 O HMS BALANCED INPUT AND OUTPUT

Figure 5. Input and Output Connections

5

OPERATION

Table I. Control ond Indica tor Functions

CO NTROLS AND INDICAT O RS

The pilot indica tor and al l operating controls ar e on the front

pan e l (see Figure 6). Thei r function s are descri bed in Table

I. A hinged cover preve nts inad vertent control changes.

When the hinged co ver is secured, onl y the BYPASS switch

and pilo t indicator are exposed.

Use of Equalizer Con trols

Although the filter controls are continuously variab le slide

potentiometers, they are det ented in increment s of 1-1/2 dB.

ALTEC strong ly recommends that onl y the det ented pos itions

be used to guarantee prec ision resetting of the con trols.

Typ i ca I sound system response curves before and after equa 1-

i zat ion are shown in Figures 7 and 8. A convenient method

of recording filter contro l se tt ings for future resetting of con-

tro ls for different installati ons or application s is show n in

Figur e 9.

On ly one pushbutto n at a ti me should be pressed on the HIGH

PASS se lector or LOW PASS selector. Two pushbuttons wi II

lock in for ei ther selector but an error in filt er frequency

inser t ion wi II resu It.

The first attempt to smooth the house cur ve shou ld be limited

to one or two of the greate st peaks or va I leys. After th is

initial smoothing, run a new house cur ve to check resu lts.

Continue adjusting one or two sections at a time, rep lot ting

the frequency response each time, until th e desired unifo rmit y

of response is achieved or unti I the correct ion capabi I ity of

the 9860A is exceeded.

After the best obtainab le house cur ve is achie ved with the

9860A fi lter controls, adjust the GA i N control to provide an

equa lized output leve l as high as the unequalized input

leve l . The GAIN control is detented in increm ents of 2 dB

and has a reinsertion range of +20 dB.

Nam e

Filter Controls

HIGH PASS Se lector

LOW PASS Se lector

GA IN Contro l

BYPASS Switch

Pi lot Indicator

1/~ OCTAVf CENT ER FReQueNCV·H I

F unction / Description

Twent y six detent ed, lin ear slide con-

tro ls,

continuous ly variab le,

gradu-

ated from O to - 15 dB.

Each control

adjusts a 1/3-oct ave

band-rejection

filter.

I SO cent er frequencies range

from 40 to 12,50 0 Hz.

Fi I ter depth is

-15

dB on each center

frequency,

combining with ad jacent filters at - 7

dB.

Four interlocked pushb utton switches

for OFF , 40 Hz,

80 Hz and 160 Hz.

Selects high pass filter to shape low-

frequenc y audio spectrum.

Inserts -18

dB/ octa ve rolloff a t the selected cor-

ner frequency.

Four interlocked pushbutton switches

for OFF, 6 kHz, 12.5 kHz and 16

k Hz . Selects low pass filter to shape

high-frequency au d io spectrum.

In-

serts -18 dB/ octa ve rolloff at the se-

lected corner freq uency.

De tented, lin ear sl ide contro l, con-

tinuous ly var iable over a 20 dB range.

Adju sts leve l of eq ua lized program to

match level of unequalized program.

Pushbutton switch for A/ B comparison

or bypassing 9860A . Options of mo-

mentar y action or pus h-and- lock.

Light-emitting dio de . Continuousl y

I it when equa I ize r is in operation.

Periodicall y flashe s in bypass mode.

on ,,,

- - - - - - - - - - - - - - - - - - - - - - - - - -~

- - - - - - - - - - - - - - - - - - - - - - - - - _ ,

- - - - - - - - - - - - - - - - - - - - - - - - - -·

- - - - - - - - - - - - - - - - - - - - - - - - - _,,

- - - - - - - - - - - - - - - - - - - - - - - - - -··

Figure 6. Front View 9860A, Hinged Pane l Cover Open

- 8 -

I

--0

,

90

85

80

75

70

65

..J

fu 60

al

"C 55

50

~

FREQUENCY IN HZ

90

85

80

75

70

65

& 60

al

"C

55

50

----,

FREQUENCY IN HZ

--+-+- ..

t--l----

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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

1 2 3 4 5 6 7 8 9 10 ll 121314151617181920212223242526

4-0

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12

BAND NUMBER

Figure 7. Typical Sound System Response Curve Before Equalization

Figure 8. Typical Sound System Response Curve After Equalization

50

63

80 100

125

160 200

250

315

400

CIRCLE DETENT SETTING FOR EACH CONTROL ANO WRITE "IN" FOR EACH SELECTED PUSHBUTTON

1/3 OCTAVE CENTER FREQUENCY - HZ

500

630

800 1000 1250 1600 2000 2500

3150 4000 5000 6300 8000 10000 12500

Figure 9. Control Settings Record

GAIN

12

16

20

HIGH PASS

EJ

OFF

40 HZ

80 HZ

160 HZ

LOW PASS

EJ

6KHZ

12.5 KHZ

16 KHZ

OFF

SERVICE

If a ma I function occurs, service shou Id be performed by an

ALTEC Qualified Service Represen tati ve. For factory ser-

vice, ship the 9860A prepaid to:

Custo mer Service

ALTEC

131 West Katella Avenue

Anaheim, Ca lifornia 92803

For additional informa tio n or techn ical assistance, ca ll (714)

774-2900, or Telex 65-5415.

ACCESS

Obtain access to the chassis interior by removing the top and

bottom covers and / or the co ntrol panel assembl y.

Cover Removal

Remove seven screws securi ng each cover and lift off cover.

Figure 3 shows interi or with bottom cover remo ved and Figure

lO shows interior wit h top cover removed .

Control Panel Assembl y Removal

Use the fol lowing procedure to remove the control panel

assembly:

Step 1. Remove four screw s securing hinged control pane l

cover and lower cover.

Step 2. Remove onl y two screws from each side of contro l

panel, above hing e (see Figur e 6), to free control

panel assem bly from chassis enclosure.

Step 3. Carefully withdraw control panel assembl y from

enclosure to the extent permitted by power cable.

PARTS REPLACEMENT

Fuse Replacement

Fuses for ac I ine power (F2) and battery power (F 1) are

mounted on the rear of the chassis (see Figure 2). If replace -

ment is required, det ermine and correct any cause of failure

before replacing fuse. Install an identica l fuse (see

PARTS LIST ) by unscrewi ng fuse holder, rep lacing fuse

and resecuring fuse holder.

.------ CAUTION-----

Be sure to re place the ac I ine fuse of

a unit opera ting on 240V line power

with a fuse rated for 1/2 ampere.

Input and Output Transformer Replacement

The input (Tl) and output (T2) transformers are plug-in mod-

ules located within the chassis (see Figure 10) . Use the

following procedure to repla ce either transformer :

Step l. Remove seve n screws securing top cover and I ift off

cover.

Step 2. Remove screw, nut, washer and clamp plate secur-

ing transform ers.

- 10 -

Step 3. Replace Tl or T2, as opp/ icable, with identical

module (see PARTS LIST).

Step 4. Install clamp plate and attac hing hardware previ-

ously removed.

Step 5. Replace top cover an<;l secu re with seven screws

pre viously removed.

Pilot Indicat or Replacement

Use the following procedure to replac e the pilot indicator:

Step l. Remove contro l panel assembly.

Step 2. Remove pilot indicator from cl ip-ring mounting by

pressing it through from the front side of panel.

Step 3. Press replacement pi lot indicato r (see PARTS LIST)

into the clip-ring mounting.

Step 4. Unsolder old pi lot indicator an d solder lead s to re-

placement pilo t indicator, obse rving proper polarity.

Step 5. Replace control panel assembly by reversing steps of

removal procedure.

Power Transistor Replacement

The power transistor (Ql) is located on the bottom chassis

subassembly (see Figures 3 and ll). Use the following pro-

cedure to replace it:

Step l . Remove seven screws securing bottom cover and I ift

off cover.

Step 2. Unsold er transistor leads from terminals 4, 5 and 6

of term inal board TBS.

Step 3. Remove mounting screw and I ift Q l from chassis.

Step 4. Be sure the following conditions exist when replac-

ing Ql:

a. Mica insulator is not damag ed; if damaged, re-

place with new insulator.

b. No grit or metal particles are lodged between

Ql and chassis.

c. Both sides of mica insulato r are covered with

silicone grease or fluid.

d. Mounting screw is tight .

Step 5. Solder Ql leads to terminals 4 , 5 and 6 of TBS in

acco rdance with lead configurat ion shown in Figures

3 and l l.

Step 6. Replace bottom cover and secure with hardware

previously removed.

Printed Circuit Board (PCB) Replacement

Three potentiometer PCB's, three filter PCB's and one control

PCB are located within the chassis (see Figures lO and l l).

Repair or component replacement for any PCB should be made

~

at factory service .

(A6)

HIGH-FREQUENCY FILTER PCB

(A4)

MID-FREQUENCY FILTER PCB

CONTROL

(A l,A3)

LOW /Ml D-FREQUENCY

POTENTIOMETER PCB

(A2)

LOW-FREQUENCY FILTER PCB

Figure 10. Top View 9860A, Cover Removed

....----- CAUTION------,

Filter PCB's have several factory-

adjusted potentiometers. Their ad-

justments must not be disturbed be-

cause any changes result in misalign-

ment of the corresponding band-re-

j ection filters. Adjustment of these

potentiometers should be done only

at factory service. --

A new or repaired PCB may replace a failed PCB to restore

operation. Remove the control panel assembly, then use the

applicable replacement procedure for the failed PCB.

.------ CAUTION----~

When removing and replacing any

PCB, do not warp_, bend or twist the

board """'"orconductor may fracture.

1 . Control PCB Replacement

Step a. Remove two screws at front end of PCB which

secure it to spacers on chassis.

Step b. Carefully lift rear of PCB to free connector

pins. Take care that control buttons do not

bind in control panel while removing board.

Step c. Insert control buttons of replacement PCB

through appropriate holes in control panel and

position connector pins of replacement PCB

over receptacle. Verify that all PCB connec-

tor pins mate properly with receptacle, then

press PCB firmly into receptacle. Be careful

not to warp, bend or twist the board.

Step d. Align PCB mounting holes with spacers on

chassis and secure PCB with two screws previ-

ously removed.

- 11 -

Step e. Replace control panel assembly by reversing

steps of remove I procedure.

2. Filter PCB Replacement

Step a. Remove four screws from rear of board which

secure it to spacers on potentiometer PCB.

Step b. Carefu I ly I ift PCB to free connector pins; if

necessary, remove plastic cable clamps from

cable harness.

Step c. Carefully remove all wire connections from

PCB, tagging each connector as removed with

wire color / relationship •

Step d. Attach wire connectors to replacement PCB in

accordance with tagging (see Step c).

Step e. Position connector pins of replacement PCB

over receptacle, then press PCB firmly into re-

ceptac I e. Be carefu I not to warp, bend or

twist the board.

Step f. Align PCB mounting holes with spacers on po-

tentiometer PCB and secure it with four screws

previously removed.

Step g. Replace any cable clamps removed in Step b.

Step h. Replace control panel assembly by reversing

steps of remove I procedure.

3. Potentiometer PCB Replacement

Step a. Remove nine plastic slider tips from filter con-

trols of PCB being replaced; the tips are press-

fitted and may be pulled free.

Step b. Remove four screws securing PCB assembly to

front panel.

Step c. Remove four threaded spacers securing potenti -

ometer PCB to filter PCB.

Step d. Carefull y lift PCB to free connector pins.

Step e. Position conn ec tor pins of replacement PCB

over rec eptac le. Verify that all PCB connector

pins mote properly with receptacle, then press

PCB firmly int o receptacle. Be careful not to

warp, bend or twist the board.

- 12 -

Step f. Secure potentiometer PCB to fil ter PCB with

four thread ed space rs previously removed.

Step g. Align spacer mounting holes with holes in front

panel and secure PCB with four screws previ-

ously removed.

Step h. Press nine plastic slider tips, previously re-

moved, onto filter controls .

Step i. Replace control panel assembly by reversing

steps of removal procedure.

APPENDIX A

PROCEDURE TO MODIFY 9860A FOR LOW-LEVEL

SIGNAL APPLICATIONS

Step 1 • Remove top and bottom covers of 9860A.

Step 2. Rewire sockets of transformers Tl and T2 to accommo-

date 15095A transformers in accordance with the fol-

lowing wiring diagrams.

~

T2

~

P4 15095A

L!J

TB2

Step 3. Complete procedure for Control Panel Assembly Re-

moval given on page 10. Remove Control PCB as-

sembly (see Figure 10 and procedure for Control PCB

Replacement given on page 11).

Step 4. Locate R36 on Control PCB assembly as shown below,

and replace R36 with a 1 SKQ resistor.

Step 5. Replace Control PCB assembly in 9860A (reverse pro-

cedure given on page 11). Replace Control Panel

Assembly in 9860A(reverse procedure given on page

10).

APPENDIX B

PROCEDURE TO MODIFY 9860A FOR USE WITH

8080A PINK NOISE GENERATOR

Step 1 • Remove top and bottom covers of 9860A.

Step 2. Install a 5100, 1/2-watt resistor from pin 7 to pin 1

on TBS (see Figures 3 and 11).

- 13 -

CJ

+

C 7

0

CJ

0

+

C 6

:1

CJ J3

J4

:J

CHANGE R36

FROM 620 D

TO 15K D

Step 6. Install 15095A transformers in sockets for Tl and T2

(see Figure 10 and procedure for Input and Output

Transformer Replacement given on page 10.

Step 7. lnstal I Control Panel Assembly top and bottom covers

on 9860A (reverse sequence of Step 1 ).

Step 3. Install a jumper wire from pin 1 of TBS to pin 5 on

transformer Tl socket.

Step 4. lnstal I a 1500 µF, 25V de capacitor between pin 1 of

TBSandground lug of capacitor Cl (negative side of

capacitor is ground).

Step 5. Replace transformer Tl with 8080A (see Figure 10

and procedure for Input and Output Transformer Re-

placement, page 10).

Step 6. Install top and bottom covers of 9860A.

.i,..

Al

J_2

POTENTIOMETER

BOARD

27- 01- 04 2469

JO J 4 J5 JE,

J7 JB

1231231231231 23 1 23 1 23 1 23

P1 P2 P3 P4 PS P6 P7 PB

LOW FRE Q FILTER

A2

27- 01- 0424 20

PIO

m

Pl [ i 2 3 4 5 6 7

y y y y - y

234567

J 3

2. CAPACITANCE VALU ES IN MICROFARAOS - 20 .. 1QOD/o

I. RESIST A NCE VAL UES ARE IN OHMS ! 10~1.

NOTES, UNLESS OTHERWISE 1NOICATEO.

A3

A4

POTE NTIOMETER

BOARD

27-0l-042469

J4 J5 J6 J7

MID FREQ FILTER

27- 01-042440

P 10

t -i -r-1

t=ttti

pzr::r=-1 i 1 Y

~

; )

y - y y--y-yyy

234567

+ 24

EXT BATT

J2 A 7

CONT RC L 8 0 ,\l<C

27- 0 1-04 24 70

J B

J9

C2

~~so

A5

POTENTIOMETER

BOARD

27- 0 1- 042480

R___Lll_!_S...!,_O_!<S

O l ] 12.F.1.., ,:::o :z. pea ,.,

o.;J..I J•wl\~.Ja,J"~,..,"l 'o. ~I

t- 'o~

@l oo

~foo

c 1£12)/.i~I a.

~,,,. .. -~-· _ .. ~---=-~

RE-RDUTW CR-I -ADDED

F3 - ECO /135B

ADDED C R4 ~___!__!__g!_Q _ __J__g_ F"

Dbr.LIJ LI TIIRLI~, ,C".3 771/itlt'&.

li'£JO?a:JJ Pa-Ao/I>' arO / I' C .l..

l .:'.31 231231231 23 1 ?.3 1 2 3 1 23123

Pl P 2 P3 pa P5 P 6 P 7 PS P9

A6

HIGH FREQ FILTER

27-01-042450

PIO

wwn

P3!\ j

~ ~ ~

t !1

y y y y y y y

C4

J;. 0,IDISC,

3 4 5 E, 7

J I

+ I

Pl

-2

>a</ CR3

;sl=./ POWER INDICATOR

JUTFUT

110/120 VAC

:::::·:::.:: ·.:: ::":.:.. .. . ·; ::···: ·

71

SK'. H c ,v,A TIC -

l

""",.o'"'""'"•"'cuow ,,,.,_,_,

>--. -- - -- . ' " " 9 85 0A

1----+-l- - •·

00

_ ACTIVE EQUALIZ rn

;'~G,C1 A,

ALTEt

-- ·

/1 ~.t~lM>f,oJrtt.i,,,_

..,N,..,.,,..c:,.u"o""''"'

D1207C0-06

l ~ l

Figure 11. Schematic (2D700-6), 9860A Active Equalizer

JI

J2

J3 J4 JS J6

J7

J8

J9

2 3

2 3 2 3 2 3 2 3 2 3 2 3

2 3 2 3

2

2 2 2

2 2

RI

R2

R3

R4

RS

R6

R7

R8

R9

Figure 12. Schematic (2C693-l ), Low/Mid Frequency Potentiometer PCB Assembly (Al, A3)

JI J2 J3 J4

JS

J6 J7

J8 J9

2 3 2 3

2 3 2

3

2

3

2

3 2 3 2

3 2

3

-f-

--

- - -- -

- -

3

2

2 2

2 2 2

2

2 2

RI

R2

R3

R4

RS R6

R7

R8

R9

Figure 13. Schematic (2C694-1), High Frequency Potentiometer PCB Assembly (AS)

- 15 -

0-

Pi

VI

P2

3 O.LL TRANSISTORS ARE: 010P4/2N5308

RS

75 0

V2

V.2 V l 2

2. ALL RESISTORS ARE IN OHMS, 1/4 WATT 5%

I. ALL CAPACITORS ARE IN M\CAOFAAADS

NOTES, UNLESS OTHERWISE INOICATEO.

P3

V I

RO,

P4

R31

7'0

P5 P7

p 9

IZ[;.I.. F<=>IZ. PJZ.o:>O

-z.. IACC£.D CAf:U:-

V2 V.1 2

~

V.2 Vl 2

~

V1R89

IM

10~

VI 2

R9~

20K

V2

t l5/10!

6

R64

750

na

VI

2K '-------r,

R65

20K

PG

V2

PS

VI

""

750

R87

20K

R77

2)(

R90

2.21<

,o-.

P.91 R9~

IOK 12.7K

10¾ Ill.

+

c..L C45

5/10

RSG

270

R97

750

V2

R78

IM

10,

CABLE

o• PIO /'

-I(

1

)~ i I INPUT

+ ~1 0

?.",•: :, 71.

~>---t2 VI

--+»--~ 3 NOT USED

~>---t4 GN0

"41>-----t-5 V 2

-fn---~6 NOT USED

l,.>-----9-7 OUTPU T

Pl

SC HEMAT IC-

LOW Fl"IE,J '.'ii..T~R

B'JARC,

Figure 14, Schematic (20697-2), Low Frequenc y Filter PCB Assembl y (A2J

ALTEC

- ·

•-_, ~l .. -.._

AMAHKIW . CAU...,.__..,

D120697 -t

I

~

I

'-J

I

Pl

P3

V2

VI

V2 V I ?.

I

VI

R9

750

V2

IRl2

IM

~lot----~

-iT 5/JO

R20

750

P2

3. ALL TRANSI STOR S ARE D16P4.'2 NS3C.8

10¾

2. A LL RESISTORS ARE IN OHMS , 1/4 WATT 5%

\, ALL CAPAC ITOR S ARE IN MICROFARAD$

NOTES: UNLESS OTHERWISE INOICATEO.

R4

R42

750

VI

R 31

7'0

2• "------- -+--+

R4'

P4

P5 P7

V(:

1

1 ~2 I - -

~

V.2 VI 2

IM 31

IO'T. t,,±

110

~i31

~~

~5

V2

V '

~R'4

IM

R65

20K

PG

n6

V2

t56

IM

ltlY.

1'15/10

•

2K

RB6

750

V I

RB7

20K

PS

1-lSO

:?.; K

IOY.

V2

2

~9 1

IUK

10¾

tR78

,M

,o,

izet.. F="o<z. ?rz.oo

p 9 z 1 ,A.ooE.D <::A'P.,U. i. P 2. JaJl,ftJ

l?<J

~

-;~

~~~

,1~1&

R)7

75 0

i_L

CABLE

PIO

-- --+----,> I I tr~PUT

t-+z VI

"°1>--? 3 NOT US[U

_ _ri >----r)-4 GND

7

➔

-+5

V2

-+ -+ 6 NOT USED

L----4

1

>-----------4,.7 OUTPl.11

..... .. ~,--" ............. t-,· - ·1-1-.,

~~fA

P2

SCHEM.A TIC-

MID FREQ FILTER

BOil.RD

ALTEC

-·

.--"' 0.V":Yt ... --

........... , .. . c ............ ......

D12D698 -Z

I ~ 1

Figure 15 . Schemat ic (2D698-2 ) , Mid Frequenc y Filter PCB Assembl y (A4)

(X)

Pi

P3

V2 VI 2

3 V2 VI 2

VI

2,2K.00525 Rl6 I

Rl9 10.0K

270 I}'.

c,o

-tf5/10

R20

750

R22

I.SK

R21

vv...

20K

P2

~Rl4

I0K

10·1.

R9

75 0

3. ALL TRANS I STORS ARE D16P4/2N530S

-tf5/10i

R42

750

VI

R 31

750

R4

I.SK~-----+--<

R43

20~

P4

2. ALL RES ISTORS ARE IN OH MS, 1/4 WATT 5%

\, ALL CAP AC ITOR S ARE IN MICROFA.RAOS

NOTES: UNLESS OTHERWISE INOICATEO.

P5

V2 VI 2

3

V2

VI

'

R45

~~ '" I

IM I

+ 10¾

10Y.

20K 5110 RSS R68

1.5K '">?M

na

V2

V I

R65

20K

P6

2

r·

20K

V2

t R56

j',M

,or.

P7

I

PA

VI

R87

20K

; V2

i t"

R77 I

11

~'"1.

f,.SK

+C4l

5/10

VI

2 p 9

h~

C4,

ve

R91

12K

10,-o

.,.

C36

5/IO

R9c

270

R_~S

3.311'

27PF

QIS

AL4l440

R92

330

R93

2.7K

+0/ 50

-0:SLE

PIO r

~-----!-+-----+-- -- --'~ I INPUT

4b>-\3>2 V I

~---- +--------'-'

1

>--------?3 SECTION 91N

~>--------? 4 G N 0

~

4f>----t 5 V2

L_-- -----+1-----4J)) - -- ~.6 SECTION 8 OUT

-- - --"~7 OUTPUT

. ... ,.,- , .. , .. -....

'" "··~""' ··~" ... I , _ 1-1 , I

P3

SCHEMATIC-

Ht FREQ FI LTER

BOARD

Figure 16. Schematic (20699-3), High Frequency Filter PCB Assembly (A6)

ALTEC

- ·

,. ,,,,,,_., /J,1"V1"9.u ... i...

......... HCIM ,CA l.l" Q .. N ! ...

DI 2D699 -03

I

~

I

'-0

i

H

I

p

A

5

L

i

L

0

w

p

A

5

L

B

y

p

A

5

OFF

16 0 HZ

51

80 HZ

40 H2

GKHZ

52 12.5KH2

t6KH2

OFF

53

I N

i~- ·H ~~ 90 ,

,1n 11 ___j

--- ~j

~L T_;

-~

r - - -- I

I.. - - _j

~

51K r

Pl~

2

-

L AM P

'2. ALL CAPACIT OR VALUES ARE I'll MICRO F"A;::i.l.CS .. 20- IOOo/.

I. AL L RESI STOR VALUt::, ARE IN " HI•!~ l/4 W 5 "/,.

NOTES: UNLESS OTHERWISE INDICATED.

Rl2

,c,

10~

Figure 17.

R 3/

Nv

"

112 w

10%

'

~~

C5

+

4 .7/10

R17!LC6

!12Kr~i~

'

~

v

~

\ I Z CL. ;:'<:>~ t"2c>O

FREO)

AC."Ji: l,;; , !2 /...:!,~ ,:,,.I.)

C 1:. (.la, - l(ri)i,z_ h '/l '...

~

dD-BOHZ I

w,1

l~. 4.:.uz IVJISBO - c;l(H e

1..tA:'.l :: ,;Hi;.:- 12.~ 1<1-r2 w,n uKH i!c

• ..,1-1::_ WAS 12 1.Hl. • RCLOlllfE O PI

R: .,.tAS6'&::.-R1 1,msc . n: - R2.

.~11s i,,, 2K..- ,e3•,ms.:...e.t::-.e<1

IVW;, l!j .t:: - R.~W ll$ _-.C,K...·C~ ,

;~ll~ '3~!1 - -ll 7 WAS rSOIC.· Rl9

WR5 (.; 1;. - /l.W M'tS47K. ·eD

WA S !.~ .t -J:.Z2 k/ASISK·R23

Wll5 180k. - R..24 WASU>2t::- R.9

~-ms 1201::.- R.25 Wl15 9.1-::- ~21;,

W.45 41~1:. Rl.1 W/1~ 2001:.

llC'DlD Hlt.llEST f:[F. DlS.,'?,OA

QQ W A S ~OOt:'.'..; IZ~T"E-.

e11 W A-S : ''

Q.,,., TI~e T ~ -t..c.~

0

.::.!~ 1o'ii1l

11

,t

1i.c..o l.o& Z.&

rrce;E CTION 8 OUTPUT)

.....__'+ 4<4 C!iECT ION 9 INPUT)

I I I I & s crs fl<s~ NO)

I : I :

-===- ill. • m· 6 I 6P UTPUT)

' I I

I I I

7 r<7'(1NPUT)

l(VI)

NO)

MAT ~Ol! A~

SCHEMATIC -

CONTROL BOARD

ALTEC

~ -

A -ol lJ.fJ'tl' l""I Ab ,,_

.......... o: ..... C AL!"ONNIA

oi")r"\--.--

I - I

Schematic (2D701-5), Control PCB Assembly (A7)

Reference Ordering

Designator Number

Al,3 27-01-04246 9-01

A2 27-01-04242 0-02

A4 27-01-04244 0-01

AS 27-01-04248 0-01

A6 27-01-0424 50-02

A7 27-01-0424 70-03

Cl ,2 15-0 1-107 430-01

C3 ,4 15-0 2-100 110-01

. C5,6 15-0 2-1000 89-01

CRl 48-0 2-1008 35-01

CR2 48-0 2-1085 77-01

CR3 39-0 1-1122 01-01

CR4 48-0 2-0427 87-01

Fl 51-0 4-1107 82-01

F2 51-04-100464-01

F2 (optiona I 51-04-10046 3-01

240V)

PARTS LIST

MAIN CHASSIS

Name and

Description

PCB assembly, low/ mid

frequency, potentiometer

PCB assemb ly, low fre-

quency, fi I ter

PCB assembly, mid fre-

quency, filt er

PCB assembly, high fre-

quency, potentiome ter

PCB assembly, high fre-

quency, filter

PCB assembly, contro l

Cap ., 4000 µF, 35V

Cap . , 0 .1 µF, l00 V

Cap. , 0 .01 µF, 1400V

±20%

Diode, rect ifier, 3A 100,

3A, l00V PIV

Diode, bridge , SCBR/

BERBll, 1.5A, l00V PIV

Lamp, solid-stat e, 1 .8V,

20 mA

Diode, recti fier, silicon,

lA, 400V PIV

Fuse, slo-bl o, 2A, 3AG,

250V

Fuse, lA, 3AG

Fuse, 0. 5A, 3AG

- 20 -

Reference

Designator

F3

Ll,2,5,6

L3,4

Pl,2,3

P4

Ql

Rl

R2

R3

Tl, 2

T3

TBl ,2

TB3

TB4

TBS

Wl

Ordering

Name and

Numbe r

Description

51-04-119088 - 01 Fuse,

lA, 3AG, pigtail

56-01-043100-01 Choke, ferrite bead

56-01-044110-01 Choke , ferrite bead

21-01-1 10991-01 Plug, 7-pin, slot,

snap - in

21-01-107445-01 Plug, 6-pin, slot,

snap- in

48-0 3- 109715-04

Transistor , power ,

MJE 3055, select ed

47-01-10 2367-01

Res. , l 0KQ ±10%,

1/2W

47-01-102 360-01 Res., 2 .7KQ ±10%,

1/ 2W

47-01-102 346-01

Res. , 2200 ±10%,

1/ 2W

10-05-01-042

Transformer, line match-

ing (Model 15356A)

56-08-007437-01 Transformer, power

21-04-101057-01

Terminal board,

barrier,

5-t erminal

21-04-101034-01

Terminal board, barrier,

2-te rminal

21-04-10 1033-01

Terminal board,

5-t erminal

21-04-101013-01

Terminal board,

1 0-t erm i no I

60-06-012636-04

Cab le, 18GA, 3-conduc-

tor , 6 ft w/ plug

42-02-042624-04

Litho in USA CP-8 75-1 K

Altec 9860A Operating Instructions Manual

Altec 9860A Operating Instructions Manual

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