Sanyo MCH-900F User manual

Service Manual

CD Portable

FM Stereo/AM

Cassette Recorder

Specifications

( CASSETTE SECTION )

Recording system . . . . . AC bias, 4 track stereo

Erasing system . . . . . . . Magnet erase

Tape speed . . . . . . . . . . 4.75 cm /sec.

Fast forward and

rewind time . . . . . . . . . . 110 sec. (C-60 tape)

Frequency response . . .

80-12,000 Hz (Normal tape)

( CD SECTION )

Channels . . . . . . . . . . . 2 channels

SIN ratio . . . . . . . . . . . 70dB

Wow & Flutter . . . . . . . . undetectable

Sampling frequency . . . 44.1 kHz

Quantization . . . . . . . . . 16 bits linear / ch

Pick-up light source . Semi-conductor laser

Pick-up wave length . 790 nm

Laset output . . . . . . . . . Continuous wave

max. 0.6 mW

Specifications subject to change without notice.

( RADIO SECTION )

Tuning ranges . . . . . . . . .

Antennas . . . . . . . . . . . . .

( GENERAL)

Output power . . . . .

Speaker . . . . . . . . . . . . . .

Terminal impedance . .

Power Source . . . . . . . . .

Memory back-up (CD) . . .

Dimensions . . . . . . . . . . .

Weight . . . . . . . . . . . . . .

.4

FILE NO.

M~~-900F (AU)

PRODUCT CODE

No.

142 963 02

FM:88-108 MHZ

AM :525-1,710 kHz

Built-in ferrite bar and

telescopic rod antennas

4.0 W x 2 (DC max.)

12 cm x 2, 4 ohms

PIEZO

X 2

PHONES :32 ohms

MIC :200-600 ohms/mV

AC :230-240 V, 50

tiz

DC: 12V

(8 x “D “ size batteries)

DC : 6V

(4 x “AA HP7/R6° size batteries))

460 (W) x 220 (H) x 245 (D) Imm

Approx. 4.8 kg without batteries

REFERENCE

No. SM580346

CONTENTS

—

LASER BEAM SAFETY PRECAUTIONS . . . . . . . . 1

OPERATING THE RESET SWITCH . . . . . . . . . . . 1

REMOVAL AND INSTALLATION . . . . . . . . . . . . . 2

TUNER ADJUSTMENTS . . . . . . . . . . . . . . . ...-6

TAPE DECK ADJUSTMENTS . . . . . . . . . . . . ...7

CD PLAYER ADJUSTMENTS . . . . . . . . . . . . ...8

SERVICE MODE . . . . . . . . . . . . . . . . . . . . . . ...11

CD CHANGER MECHANISM OPERATION

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . .-14

LASER BEAM SAFETY PRECAUTIONS—

.

Pick-up that emits a laser beam is used in this CD player.

CAUTION :

USE OF CONTROLS OR ADJUSTMENTS

OR PERFORMANCE OF PROCEDURES

OTHER THAN THOSE SPECIFIED

HEREIN MAY RESULT IN HAZARDOUS

RADIATION EXPOSURE

LASER OUTPUT ........0.6mW Max. (CW)

WAVELENGTH ........... KIO nm

REPLACING THE PRINCIPAL PARTS

&

OF THE CD CHANGER MECHANISM . . . . . . . . . 17

EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . ...25

PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . ...27

IC BLOCK DIAGRAM & DESCRIPTION . . . . . . . . 38

SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . ...40

WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . ...41

CD CHANGER BLOCK

SYSTEM CONTROL TERMINAL LEVELS . . . . ...63

CD CHANGER BLOCK FLOWCHART . . . . . . . . . 65

CLASS 1 LASER PROOU

LUOKAN 1 LASERLAIT

KLASS 1 LASERAPPAR

CAUTION–INVISIBLE LASER RAOIATION

WHEN OPEN AND INTERLOCKS OEFEATEO.

AvOIOEXPOSURE TO BEAM.

,AOVARSEL-USYNLIG LAiEtiTRALING VEO A8NING.

NAR SIKKERHEOSAF8RYDERE ER UOE AF FUNKTION,

UNOGk UDS /ZTTELSE FOR STR~LING.

VARNING–0SYNLN3 LASER STR~LNIN.G NAR

OENNA DEL AR OPPNAO OCH SPARR AR URKOPPLAO.

STRALEN AR FARLIG.

VORSICHT-UNSICHTBARE LASERSTRAHLUNG TRITT AUS.

‘WENN OECKEL GEOFFNET UNO WENN SICHERHEITSVERRIEGELUNG

uBERBRUCKT [ST. NICHT, OEM STRAHL AUSSET2EN.

A

VARO! .Avawssa fa suoialuk!lus. ohilellaes~a Olel allliina

nakyma!lomalle Iasemileilylle. Ali kalso saleeseen.

I

OPERATING THE RESET SWITCH

WHAT TO DO IF ...

If the operation of the unit or display is n

normal, disconnect the power cord from the P

outlet and remove the batteries (if applicabl[

then press the RESET bulton (back of the un

for at least 20 seconds.

-1-

I

ii

REMOVAL AND INSTALLATION

*

,.

●

a.

This CD-radio-cassette player employs a changer mechanism as its CD block.

Care should be exercised when removing and reinstalling it.

All wiring should be returned to the original position after work is complete=

4

First have ready many the new FIXERS (614246 5271) for replacement. %

Arrange the lead wires so that they are not near the heat sink.

.

Remove any discs that are loaded in the CD changer.

...

Before disassembling the unit, set the POWER switch to the “OFF” positio~”

and wait 10 seconds while the CD changer mechanism enters standby stat&..

Then unplug the unit and begin the disassembly

procedure.

-2

CABINET

(1) Remove the battery lid.

(2) Remove the 8 rear cabinet mounting screws.

4.

--

c. CD CHANGER MECHANISM

BLOCK & P. C. BOARDS

—/’-’--k

.

b.

TAPE MECHANISM

s---

.,

.\. y

I

J

–2-

REMOVAL AND INSTALLATION

(j.

SYSTEM CONTROL P. C. BOARD S AMF. CD P. C. BOARD

●

Pull connectors straight out so that the pins do not bend.

J

AMPICD

$0

4

e. MOUNTING, POINTER

f.

“0” POINT ADJUSTMENT

1

I

MC-grease

EM-50L

...

-3-

-*..,

... ,.

REMOVAL AND INSTALLATION

g.

WIRING LAYOUT

‘a)ANTENNk

(b) TAPE MECHANISM

#

(c) SPEAKER

I

(’/

— 5-5 TuRN

(d) CD CHANGER MECHANISM

7“7

‘“p’~””’p+g-m

~+

PRINT SIDE

● The CD changer mechanism and CD mechanism move

forward and back, and to the left and right.

Arranq& the lead wires as shown in the diagram.

VIEW - A

FIXER

~

I MOTOR

1 f?C.B

FIXER

/

lr-r--=-

. Positiom the flexible P.C. board connected to the CEI

changer connector P.C. board so that it is not loose.

-4-

REMOVAL AND INSTALLATION

h. CD CHANGER MECHANISM

(a) TO OPEN THE DISC TRAY

d

(1) Turn the cam gear counterclockwise. (~)

(2) The CD mechanism move

the down position. (~)

(3) Pull out the disc tray. (@))

1

(b) REMOVING THE DISC CASE

‘romtheuppo;n

CAM GEAR

CD MECHANISM

1+ \,&

.

p

k

--, .,.,

—

T ‘p

‘UUWN

. Follow steps @ through ~, in that order, to remove

the disc case.

(c} PULLING OUT THE DfSC TRAY

(1) Move the CD mechanism to the down position. (~,@)

(2) Rllove the loading plate forward. (~)

(3) Pull out the

disc tray. (@)

Q

I M GEAR CD MECHANISM

T

UP—DOWN

-5–

TUNER ADJUSTMENTS

. Use a plastic screw driver for adjustments.

● Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter.

Supply voltage

Phones impedance :

Standard output

Function switch

PARTS LOCATION

a. AM ADJUST

Adjusting

Step

Circuit

1

I

IF

i

2

Tuning

3

coverage

i-

4

Tracking

5

DC 12.0 V

32 oh!m

&5 mW (126 mV)

RADIO

f

IENT

BAND SELECT SWITCH :

Connections

Input

output

Closed the output

Connect sweep

terminal by sweep generator to

generator, it

place

C2106 (H) &

to L2103.

TP202 (G)

Connect AM SG Connect VTVM to

to Test Loop

speaker terminals

Connect AM SG

Connect VTVM to

to Test Loop speaker terminals

6 lRepeat adjustments

455 kHz

I

Low

I

XF213

517k Hz

Low end

L2104

1750 kHz

High end

VCT -4

600 kHz

L2103

1400 kHz

VCT -3

VTVM

Oscilloscope

-4-

Max.

I

b. FM ADJUSTMENT

BAND SELECT SWITCH : FM

FM

Dummy antenna : 75 ohm unbalance

r

Adjusting Connections

Step

Circuit

SG Frequency

Position of tuning dial

Adjustment

Input output

Connect sweep Connect sweep

1 IF

generator to

IC201 @ (H) C2106 (H)

10.7 MHz

Low ..-

& TP202 (G)

2

Connect

FM SG

Tuning

Connect VTVM to

87.0

~~Z

Low end

L2102

to TP201 (H) &

3

coverage

TP202 (G)

speaker terminals

109.0 MHz

High end

VCT-2

Connect FM SG

Connect VTVM to

4 Tracking

to TP201 (H) &

speaker terminals

98.0 MHz

VCT- 1

TP202 (G)

5 lReDeat adjustments

VTVM

Oscilloscope

A

Max

Max.

I

-6–

iii

. .

TAPE DECK ADJUSTMENTS

a.

(a)

●

(b)

(1)

(2)

(3)

(4)

(5)

b.

(a)

I

(b)

HEAD REPLACEMENT AND HEAD AZIMUTH ADJUSTMENT

HEAD REPLACEMENT

4

After replacement, demagnetize the heads

by using a degausser.

Be sure to clean the heads before attempting to make any adjustments.

21P HEAD

Ml wiring should be returned to the original position after work is completed.

LOW

HEAD

AZIMUTH ADJUSTMENT

Load the test tape ( VIT-703, etc., 10 kHz ) for azimuth

adjustment.

Press the PLAY button.

Use a cross-tip screwdriver to turn the screw for azimuth

adjustment so that the left and right output are maximized.

Press the the STOP button.

After completion of the adjustment, use thread lock (TB-1401 B)

to secure the azimuth-adjustment screw.

MOTOR REPLACEMENT AND SPEED ADJUSTMENT

MOTOR REPLACEMENT

MOTOR SPEED ADJUSTMENT

(1) Insert the test tape ( MTT-lllN, etc., 3000 Hz).

(2) Press the PLAY button.

(3) Use a flat-tip screwdriver to turn the SVR (located inside the rear

of the motor) to adjust SVR so that the frequency counter

becomes 3,000 Hz.

c.

CHECKING THE MECHANISM TORQUES AND TENSION

WHiTE

HEAD AZIMUTH ADJ.

MOTOR SPEED

. Clean the head, capstan and pinch roller before making any measurement.

Measurement

Take-up torque

Back tension

Tape

tension

Cassette

for

PLAY:TW-211 1A Orive-power cassette

PLAY: TW-21 11A

measurement

F.FWD/REW:TW-2231 TW-2412

PLAY

30-60 gr.cm

2.0- 4.5 gr.cm

60 gr or more

F.FWD

55-120 gr.cm

REW 55-120 gr.cm

—

-7–

CD PLAYER ADJUSTMENTS

a.

REPLACEMENT AND LUBRICATION OF THE PICK-UP

(1)

(2)

(3)

(4)

(5)

(6)

(7)

Remove the pick-up advance gear (2).

Remove the brackets (6) securing [he pick-up rail in place.

Pull out the pick-up rail (5).

If the pick-up is reconditioned or repiaced, be sure to wipe

the rails clean and also apply a coating of FLOIL (G-425A)

to their entire circumference and

entire length.

After replacement. install the shaft as before.

The pick-up

P. C. Board pattern is “shorted”, as shown in

the figure , so that the new pick-up will not be susceptible to

the effects of static.

Set the pattern to “’Open” after the pick-up has been

replaced.

SHORT

~ OPEN

NOTE ;

● In order to prevent damage by static electricity

during shipment. the indicated patterns on the

pick-up P.C.Board are short-circuited by solder.

● After the pick-up replacement, remove the

solder that is short-circuiting the patterns.

b.

●

REPLACEMENT OF THE SLED MOTOR

Check the position of the red mark on the bottom of the

motor, as shown in the diagram.

c. LUBRICATION OF THE CD MECHANISM

● Be sure, at this time, not to touch MY other part.

● NOTE : FLOIL (G-425A)

(

fa

d

.4f$iij)

%’2 :“-

‘FLOIL(G-425A)

-6

(G-:>

F

(G-425A)

I I I

[f I

-8-

iii

CD PLAYER ADJUSTMENTS

d. PREPARATIONS

(a) Measuring instruments, tools and fiiterr

(1)

(2)

(3)

(4)

(5)

Test disc. : YEDS 18 (SONY) or etc.

Oscilloscope : SS5711 (10 MHz or dual-phenomenon)

or Memory scope : DSS6521 (Storagescope)

Screwdrivers (non-metallic) for adjustments

Low Pass Filter (L.P.F.)

Resistor, Carbon 2.2 K ohm, l/4W

e. PARTS LOCATION

1

S1606g

OPEN ICLOSE

In

❑

I

.#f

:

Adjustment

Measuring Service

Input

output

Adjustment

Item instrument Mode connection connection

location

Adjustment value

(a) Tracking

Oscilloscope

YES

TP 131 :TE

—

SVR12

Waveform symmetry

balance L.P.F.

TP132:VC

A =B 1.5 Vp-p

(b) Checking

Check be sure that the “eye”

J1479 : RF

_

the “eye”

Oscilloscope

–

—

pattern is at the center of the

TP 132:VC

pattern

waveform and that the dia-

mond shape is clearly defined

-9-

i

CD PLAYER ADJUSTMENTS

f. ADJUSTMENTS

(a) Tracking balance adjustment

4

I

(1)

(2)

(3)

(4)

(5)

symmetrical, as shown in the illustration.

(6) Switch OFF the POWER.

Within one second after pressing the! OPENICLOSE and

RANDOM switches at the same time. press the FWD

TP 131 +

switch. (Service mode: TRACKING BALANCE)

(TE) -

Connect an oscilloscopetoTP131 (T=) and TP132 (VC).

IN

Set the test disc.

TP132&

PLAY switch push ON.

(Vc) -

Adjust SVR12 so that the oscilloscope’s waveform is

(b) Checking the “eye” pattern

(1) Switch “ON” the POWER.

(2) Connect an oscilloscope to J1 479 (RF] and TPI 32 (VC).

(3) Load the test disc.

(4) PLAY switch push ON.

(5) Check to be sure that the

“ eye “ pattern is at the center of

waveform and that the diamond shape is clearly defined.

(6) Press the STOP button.

(7) Switch “OFF” the POWER.

L.P. F.

10K

‘7

~ ~ o~c,LLoscop=

T

1*5V

Ov

P-P

lV)DIV

A=B

2.2K ohm +

Jlf179

(RF)

o V&

I

OSCILLOSCOPE

I

TP132

Wc)

1

NING EXPANOED

-1o-

SERVICE MODE

The unit has four service modes.

e

●

a.

(1)

(2)

After pressing the

OPEhl/CLOSE and RANDOM buttons at the same time, press one of the following . ~

buttons within

one second to enter the corresponding service mode.

I

BIJ?TON

I

SERVICE MODE

I

PLAY / PAUSE

[ KEY WIRING CHECK

PLAY / PAUSE

I LED AND LCD WIRING CHECK

FWD

CD BLOCK ADJUSTMENT MODE

OPEN I CLOSE

CD BLOCK OPERATION DISP~Y

MODE

To cancel the

KEY WIRING

After pressing

service mode, press the POWER button to switch “OFF” the power supply.

CHECK

the OPENfCLOSE and RANDOM buttons at the same time,

press the PLAYIPAUSE button within one second.

The LEDs light and the LCD segments are displayed.

~ ..–. .—. .—..—..—..—.. —..—..—..—..—..—..—..—.. —..—..._ ..—..—.._.. _ ..

I

DISC

TRACK

l—

I

//

/ :/

ml

‘HI 1-1-

1

I

II 1 I_

:1 ‘/ :/ /:!

:-

ALL ~

1

RANDOM INTRO

REPEAT :

L ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ..J

REW PLAJ ;AUSE ST#P FJD

m

— ;---

INTRO

RANDOM —

OPEN/CLOSE

-11–

SERVICE MODE

(3) Pressing a key toggles the corresponding LED or LCD display indication on and off.

Pressing the key when the indication is off turns it on, and pressing the key when the indication is on turns it off. #

KEY INPUT

DISPLAY

REPEAT

I REPEAT

MEMORY

PROG.

PLAY / PAUSE

lb

POWER

I OFF

I

KEY INPUT

DISPLAY

LCD

LED

FWD DISC

BACK I TRACK

Ill

2

—

—1

I_

2

3

❑ 1

—1

3

141

II

—. I

41

(4) Press the POWER button to switch “OFF” the power supply and cancel the service mode.

b. LED AND LCD WIRING CHECK

(1)

J

(2)

(3)

After pressing the OPEN/CLOSE and RANDOM buttons at the same time,

press the PLAYIPAUSE button within one second.

Press the STOP button.

All the LEDs light and all the LCD segments are displayed.

[ .—..–.-. --–.-–..–..–.. --------- -–-.–..–..–..–..–.. –..–

t ! ➤ 11 PAUSE RANDOM INTRO CONTINUE REPEAT i

\ L .. . ... .. . ... ... ... ... .. . ... ... .. . ... . .. ... .. . ... ... ... ... ... . .. ..J

l—l

(n-lr-m

SE@!EM.

51,

3

“’co

(4) Press the POWER button to switch “OFF” the power supply and cancel the service mode.

-12–

i

SERVICE MODE

c.

●

d.

(1)

(2)

(3)

(4)

I

CD BLOCK ADJUSTMENT MODE

~efer to the section on CD block adjustments (pages 9 and 10).

CD BLOCK OPERATION DISPLAY MODE

After pressing the OPEN/CLOSE and RANDOM buttons at the same time, press the OPEN/CLOSE

within one second.

When the unit is in this service mode and the CD function is selected,

the LCD numeric display indicates the current CD operation.

If a CD error occurs, a number is displayed in the seconds indication area.

In addition, the CD operation indication is frozen from that point forward.

Press the STOP button when the unit is in the stop mode {o unfreeze the indication.

button

NUMBER

“SECOND”

.- .---------------------------------1----------

( DISC

i-

1

//

I

//

:-

1

TRACK

/ :/

1 I_

{

‘// I 1-/-

:1 ‘1 ‘/n

--

I

L ................................................... ..............J

CD ERROR CONDITION INDICATIONS

1 I

NUMBER CD ERROR CONDITION

o

No error.

1 Focus failure during focus search.

2 No subcode received at disc startup.

3

Can’t read TOC.

4 Focus lost during servo-on (during play, etc.).

5

No subcode received during servo-on

(durinq plav, etc.).

6

Tray-open not complete.

7

Tray-close not complete.

18

I CD error

I

9 CD error (chucking failure).

A

Unload error (unioad failure).

-13-

CD CHANGER MECHANISM OPERATION DESCRIPTION

●

a.

●

(1

The unit is capable of loading up to six 12 cm CDs at once and playing them in sequence.

Immediately before power is turned on (off status), it is in the home position.

.4

Disc case

: Disc 1 (top level)

Turntable

: Chucking

Loading plate: Holding disc

When the unit is powered on with the CD function selected, chucking takes place on the CD that was programmed when

the unit was last operated and the unit enters the standby mode.

UP/DOWN OPERATION OF THE CD MECHANISM

AND DISC CASE

Normally, the UP/DOWN MOTOR (41 4) of the disc case and CD mechanism turns the up/down cam gear (391) of the

CD mechanism in a clockwise direction, causing the up/down switch (393) to move to the “up on” position.

This puts the turntable into chucking status.

When the OPEN/CLOSE button is pressed, the cam gear (391) turns counterclockwise, putting the turntable into the

down position. (CD mechanism: down.)

(2) When the plunger (395) operates, it turns the worm gear (3661. using the gear (408) as a junction.

This causes the disc case to move up or down.

r

(3) The rear of the disc case is equipped with slits (the protrusions to the right of 363) and switches, which cause a disc

case stop signal to be generated.

UPI

CD MECHANISM UP/ DOWN OPERATION

GEAR(408 )

%

CD MECHANISfVl

UPI DOWN CAM GEAR (391)

E&

~,,’ ;(?W

GEAR (-408)

r?

BOSS

+

CONTROL LEVER (407)

:D MECHANISM

I

WN M0T0R(414) PLuNGER (395)

,.n’,-n” er. n

DISC CASE &

I

D:\

Mu I

(385)

ANISM

GEAR

(408)

DISC CASE UP/ DOWN OPERATION

wy3M&R

DISC CASE ELEVATOR

DISC CASE(363)

SENSOR P.C.B(315)

I

~-

SENSOR

/--

C-’

(

k)

‘\,

RESET SWITCH

o

)

.,, ,1,!,,,, ,

,,

Iii

k

w ,’

II

‘L

(F=:’ ~

~ “<

MOTOR GEAR

(0)

DISC CASE & CD MECHANISM

@J ) UP/ DOWN MOTOR(414)

UPI DOWN

SWITCH(393)

- 141 –

CD CHANGER MECHANISM OPERATION DESCRIPTION

b.

●

(1)

(2)

(3)

LOADING PLATE MOTION + “’OPENr’

The

loading motor (377) runs, and the loading plate (434) starts movtig toward the “OPEN” position,

d

..

performing the following operations.

Using hooks a and b on the loading plate (434), the CD is extractecf and moved from the disc case (363).

When it is over the turntable, hooks a and b separate from the CD and retract into the loading plate.

The CD is now “FREE” on top of the loading table.

Next, the loading plate moves further and, by pressing on the Ioadimg table (431), moves the loading table lock

lever (430) .

This causes it to link with the loading table and advance toward the “OPEN” position.

DISC

LOADING

(434)

PLATE

I

CMsc

I

*

“ LOADING PLATE (434)

n

.......................................................................

~Refer to the EXPLODED VIEW on pages 34 and ~

~35 for the numbers of parts not indicated here. :

.......................................................................:

CLOSED

LOADING

TABL~

AS5’Y

LOADING PLATE J%S’V

(431) - (434) “

-15-

i

I

CD CHANGER MECHAN

DURING PLAY

SM OPERATION DESCRIPTION

Gear for initial opening operation and disc case storage

d

Locks and movement starts

I

@’x2--1

OPEN

1

\

Gear for opening operation

. At initial docking, the plate gear moves the tray, then movement is

continued by the opening gear.

c. LOADING TABLE MOVEMENT + “OPEN”

. As it moves, the loading table performs the following operations.

(1) [t removes the binder from the centering hold lever (322).

(2) It moves the cover plates (425, 427) so that the disc stopper (424) rises up and stabilizes the disc setting.

(3) It sets the OPEN/CLOSE switch (399) to the “OPEN ON” position.

d. LOADING TABLE MOVEMENT -+ “CLOSE”

. After putting the disc in place and pushing the loading table (431} with your hand, the OPEN/CLOSE switch

moves to the “OFF” position, the loading motor reverses, and the loading table begins to move, performing the

following operations.

(1) It lowers the disc stopper (424).

(2) When the disc sensors (345, 450) are triggered, the turntable starts up after operation (3), and the TOC is read.

(3) The loading table guide (355) disengages the loading table lock lever (430).

This undoes the link between the loading table and loading plate.

e. LOADING PLATE MOVEMENT + “CLOSE”

● The loading motor moves the “FREE’” loading plate toward the “CLOSE” position,

causing it to perform the following operations.

(1) [t inserts a CD into the disc case and moves the loading completed switch (314) to the “OFF” position.

(2) Hooks a and b on the loading plate clamp the CD.

(3) Press the POWER button to switch off the power supply and cancel the service mode.

-16-

i

I

REPLACING THE PRINCIPAL PARTS OF THE CD CHANGER MECHANISM

a. SENSOR P.C. BOARD LAYOUT DIAGRAM AND ITS APPLICATION

. The CD changer mechanism employs four sensor

P.C. boards.

d

. Observe the following precautions to prevent sensor malfunctions.

(1) Mount light-emitting and light-receiving

elements on the P.C. boards in their correct positions.

Make sure such parts are not tilted or loose.

r

u

1

DISC CASE ELEVATOR

SENSOR ,PC.B (315)

I

“sC;Y;:; PI+

:%:.

1

J

w PHOTO SENSOR

0.2mm or”more 7VT

i-l-

Detects whether disc is

I * DISC CASE

present or absent

(363).

Detects chucking errors

La@as!

Should be parallel to P.C. board

....................... .......................

—

M

~The height of the P.c. board !

r-+,

; must be adiusted.

mTiF

> E% -+wi%’:.’i’%’?’

Should not be loose

%L-.._xxYA\\ /1’

v v LCD CHANGER CONNECTOR

\.

‘-/

.. -

_

‘L

........-#

/-”

(434)

PHOTO

SENSOR

DISC SENSOR P.C.B

LOADING PLATE

“LOWER” (345)

/ ~

LOADING PLATE

SENSOR P.C.B(304)

h

\+

o,2mm or more~~

~+ LOADING PLATE

II

SENSOR I?C.B (304)

,. -.. .

“’ “+~ O.lmm or more

u

F-

—

No.

304

345

450

315

P.C.BOARD NAME

I

DESCRIPTION

LOADING PIATE SENSOR P.C.B

DISC SENSOR P.C.B “LOWER”

DISC SENSOR P.C.B “UPPER”

DISC CASE ELEVATOR

SENSOR P.C.B

. Detects the loading status by monitoring the

movement of the loading plate (434).

Tks.e sensors detect the following conditions on

SENSOR P.C. boards 345 and 450.

. Disc present or absent (PCO02/PCO03)

● Chucking error (S005)

. Detects whether DISC CASE is in UP or DOWN

position (PCOO1 ).

. Detects when DISC CASE is in RESET position

(s001).

● Detects when loading plate (434) is in RESET

position (S002).

-17–

ii

REPLACING THE PRINCIPAL PARTS OF THE CD CHANGEF? MECHANISM

b.

●

REPLACING THE PLUNGER

Turn the plunger “ON” and “OFF”, and confirm that the position of the controf fever (407) and gear (408) change.

.4

To prevent improper movement

Of the tip of the control lever (407), confirm that it has no grease on it.

PLUNGER “OFF”

PLUNGER “ON”

CD MECHANISM

UPIDOWN CAM

GEAR(391)

c.

●

>

GEAR (408)

DOWN

\

GEAR ( 408)

UP

CQNTnOL

1

LEVER (407)

R

= ~~~than0.2mm

~%j ‘ ~ti-pLuNGER(’”)

~zAR f 63 ---)

(408) “*

MOTOR GEAR

DISC CASE & CD MECHANISM

o

uP/DOWN MOTOR (414)

o

MOUNTING THE STOPPER AND ARRANGING THE LEAD WIRES

Confirm that the hook on the stopper (353) is not bent.

I

DISC SENSOR f?CB

“LOWER’” (345)

OPEN / CLOSE

SWITCH (339)

Arrange the fead wires so that they do not stick out

from the chassis.

This will prevent [hem from getting caught when the

disc tray opens and closes.

-18-

i

REPLACING THE PRINCIPAL PARTS OF THE CD CliAN(3ER MECHANISM

d.

●

(a)

●

(b)

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

REPLACING THE DISC CASE ELEVATOR SENSOR P. C. BOARD (315)

This P.C. board performs a very important function. as it must monitor the up,

down, and Ioadinq status of the disd-cas%.

When replacinq the P.C. board, be verv careful so as not to adversely affect any of the other parts.

REPLACING THE P.C. BOARD (315)

Follow steps @ and @ below, in that order, to install the

spring coil (314).

Make sure not to install the spring coil backwards.

P. C. BOARD HEIGHT ADJUSTMENT

Set the POWER switch to the “ON” position and the

FUNCTION switch to the “CD” position.

Press the DISC 1 button.

The disc case lowers into position for the first disc.

Adjust the P.C.board height adjustment screw so that

the distance between the disc case and the chassis is

46.0 t 0,3 mm.

Next, press the DISC 6 button.

Once again, press the DISC 1 button.

Set the POWER switch to the “OFF” position and wait

about 15 seconds.

Set the POWER switch to the “ON” position.

Confirm that the distance between [he disc case and

the chassis is 46.0 f 0.3 mm.

If the distance is not 46.0 t 0.3 mm, repeat steps (2)

through (8).

(1O)After adjustments are complele, apply thread lock

(TB-1401 B) to the screw (31 1).

SPRING

(314)

P

1

DISC CASE ELEVATOR

SENSOR PC.B (315)

f[~

– 1: ‘Q

b

/?+

~“c ~

=

~

u

L1

.“~o [&Q,

000

$

g

BRACKET ( 313)

w?

● After adjusting the height, apply

screw lock to the screw (311).

THREAD

LOCK

TB-1401B

T

SCREW

DISC CAS: (363)

(311)

-19-

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