Casio CD-311-S Service manual

CD-311S

(without price)

INDEX

Model-B: U.S.A.

CD RADIO CASSETTE PLAYER

CONTENTS

Disassembly Instructions ................................................................................................................. 1

Reassembly of Tuning Pointer ......................................................................................................... 3

Block Diagrams ................................................................................................................................ 4

Tuner.......................................................................................................................................... 4

AMP, Tape, PS .......................................................................................................................... 5

CD.............................................................................................................................................. 6

Cassette Mechanism Electrical Adjustments ................................................................................... 7

CD Adjustment ................................................................................................................................. 9

CD Troubleshooting ....................................................................................................................... 11

PCB Views ..................................................................................................................................... 20

Tuner PCB Top View ............................................................................................................... 20

CD AMP/Door SW PCB Top View ........................................................................................... 21

VR PCB Top View.................................................................................................................... 22

PS PCB Top View .................................................................................................................... 23

Tape PCB Top View................................................................................................................. 24

LCD PCB Top View.................................................................................................................. 25

Wiring Diagram .............................................................................................................................. 26

IC Lead Identification and Internal Diagrams ................................................................................. 27

Schematic Diagrams ...................................................................................................................... 33

CD Mechanism ........................................................................................................................ 33

Tuner........................................................................................................................................ 34

AMP,PS.................................................................................................................................... 35

Tape......................................................................................................................................... 36

CD............................................................................................................................................ 37

Parts List ........................................................................................................................................ 38

Exploded Views.............................................................................................................................. 45

Cabinet..................................................................................................................................... 45

Cassette Mechanism ............................................................................................................... 46

Case Unit ................................................................................................................................. 47

Top Case Unit .......................................................................................................................... 48

CD Mechanism ........................................................................................................................ 49

DISASSEMBLY INSTRUCTIONS

1. Remove the battery cover and batteries.

2. Remove six screws A holding case B ass’y(case B unit, PS unit).

Battery Cover

Case B Ass'y

Figure 1

3. Remove four screws B holding the case ass’y.

CD Door

Case Angle

Top Case Ass'y

Case Ass'y

Figure 2

1

4. Pull out the two slect knobs, volume knob and tuning knob.

5. Remove four screws C holding the tuner unit.

6. Remove six screws D holding the CD AMP unit.

7. Remove five screws E holding the VR unit.

8. Remove three screws F holding the CD mechanism set.

9. Remove two screws G holding the LCD unit.

LCD Unit

VR Unit

Volume Knob

Select Knob

Tuning Knob

Select Knob

Top Case Unit

Tuner Unit

CD
Mechanism
Set

10. Remove three screws H holding the tape unit.

11. Remove four screws J holding the angle A and
cassette mechanism unit.

Cassette mechanism Unit

Angle A

Figure 4

CD AMP Unit

Figure 3

Tape Unit

Case Unit

2

REASSEMBLY OF TUNING POINTER

1. Turn the varicon unclockwise stop position.

2. Set the pointer ; mark position. (refer figure 6)

3. Set the varicon gear of figure 6 position.

4. Insert the tuner gear

Varicon Gear

K

Pointer

Tuner Gear

Varicon

Tuner Chassis

L

Figure 5

Pointer

Mark

Varicon Gear

Tuner Chassis

Tuner Gear

Figure 6

3

BLOCK DIAGRAMS

Tuner

Antenna

L1 L5

Bar

AM

RF In

FM
RF Out

To Amplifier Block

SW1

AM

BAND SW

FM-MONO

L4

FM

VCC1

22 21 20 19 18 17 16 15 14 1324 23

OSC

FM

OSC

AM
OSC

AM

OSC

L3

DET

Out

MPX In

PRE

FM­Stereo

LPF1 LPF2

VCO

GND VCC R ch L ch

31 2 4

D3

VCO

Decode

VCC2

FM

AF

CF1

AM/FM

SW

Level

DET

AM IFInFM IF

CF2

F.F

FM

IF

In

TUN

LED

GND2 QUAD

AM

AF

AM

DED

FM
RF

FM

MIX

1 2 3 4 5 76 8 9 10 11 12

Rod

Antenna

FM

RF In

GND1

L7

FM MIX AM MIX

AM

MIX

AGC

L8

AM

IF

AGC

HYS

ST

LEDFMDET

SW

L9

FM Signal
AM Signal

4

AMP, Tape, PS

To CD
Block

To Tuner
Block

VR201 Volume

SW202

CD 9V
GND
L ch
R ch

L ch
R ch
TU 9V
GND

L ch
R ch
REC L ch
REC R ch
TAPE 9V
DC 9V
GND
BEAT

SW201

Function

Q620,

Q720

SW501 Beat

TU 9V

CD 9V

DC 9V

Tape 9V

DC 9V

GND

AC 9V

Q623,

Q723

AF MUTE

CD 9V

TU 9V

PW AMP

BATT

AMP BLOCK

Tape 9V

DC 9V

IC581

T1

AC

PS BLOCK

Speaker

Headphone

L ch
R ch
REC L ch
REC R ch
Tape 9V
DC 9V
GND
BEAT

Audio Signal
Recording Signal

TAPE BLOCK

SW101

REC/PLAY

IC101

PRE AMP

R/P Head

L101
OSC

5

CD

CD Mechanism

Disc

Pickup

Disc

M

Motor

Sled

M

Motor

Q501
Laser

Driver

IC501

Signal Servo

Processor

IC503

Motor and Actuator

Driver

Display

IC502

Digital Signal

Processor

IC504
Audio

Filter AMP

SW801~SW806

Control

IC801

µµ

µ-COM

µµ

X501

16.9 MHz

Pset
SW

Door
SW

CD L ch
A-GND
CD R-ch
CD 9V

Q501, Q511

D510

Regulator 5V

Q504, Q505

D504

Regulator 8V

GND

6

CASSETTE MECHANISM ELECTRICAL ADJUSTMENTS

General Remarks

* Before attempting to adjust the mechanism, wipe clean all tape-contacting surfaces (pinch roller, REC/PB

head, erase head, and capstan), as well as the contact surfaces of the driving parts (motor pulley, flywheel,
pulley, belt, and clutch assembly), with a piece of soft cloth moistened with denatured alcohol. Grease stains
may cause trouble.

* Never use a magnetized screwdriver for head adjustment.

Equipment Required

* Oscilloscope
* Frequency counter
* Screwdriver (Plastic type)
* Test tapes MTT-113C (TEAC) or TCC-111N (TEAC)

Head Azimuth Adjustment (Figures 7 and 8)

Step Setting

1

Play the test tape 8 KHz
position. (MTT-113C)

Set

Note: Mode Switch is X-Y position.

Adjust Screw

Adjust Result

Azimuth screw
(Figure 8)

J501
Headphone Jack

Figure 7

R/P Head

Obtain the maximum amplitude.
(A: Maximum) (B: Minimum)

B

Oscilloscope

A

Figure 8

7

Tape Speed Adjustment (Figures 9 and 10)

Step Setting

1

Playthe test tape.
(MTT-111N)

Set

Adjust

Motor screw

(Figure 10)

J501
Headphone Jack

Figure 9

Result

Frequency counter reading
should be 3000 Hz (2910~3090).

Furequency Counter

3000

screw

Motor

Figure 10

8

CD ADJUSTMENTS

Pre-Adjustment Procedures

* Remove the bottom chassis assembly. (Refer pages 1, 2)
* Use the plastic screwdriver.

Equipment Required

* Syncroscope (with probe 10:1)
* Screwdriver (Plastic type)
* The Test Disc SONY YEDS-18(Type 4)ABEX TCD784

E-F Balance Adjustment (Figures 11 and 13)

Step Connect Setting Adjust Result

Play the test disc.1

2

See
Figure 11

Set the PAUSE
mode.

Syncroscope CD PCB

VR501

A=B

0V
(Vref)

A

B

R572

(TSO)

GND

R571 Vref

Figure 11

RF Adjustment (Figures 12 and 13)

Step Connect Setting Adjust Result

1

See
Figure 12

Play the test disc.

VR502

Adjust VR502 for the amplitude of the waveform
at maximum.

0V

Measuring on syncroscope.

Syncroscope

CD PCB

>1.0V p-p

GND

Figure 12

9

R570 (RFO)

R571 Vref

CD Adjustment Points

Vref
R571

RFO
R570

TSO
R572

VR502

RF

VR501

EF Balance

CD PCB Top View

Figure 13

10

CD TROUBLESHOOTING

Open CD door and set function switch
for CD position.

Is “00” display

on LCD ?

Yes

Load a disc and close CD door.

Is total track

numbers displayed about 5

seconds ?

Yes

Press “ / “ key.

Is the audio signal

present at the output

terminals ?

No

1

No

2

No

3

Yes

Press “ “ or ” “ key.

Can a selected

of music be searched

smoothly ?

Yes

OK

11

No

4

1. At power on, “00” is not displayed.

1

Is +5 V lines normal

(for IC801)?

Yes

Does 16.93 MHz

clock pulse appear at

IC502 pin 79 ?

Yes

Does 1.4 MHz

clock pulse appear at

IC801 pin 30 ?

Yes

* Check and circuit around IC801.
* Check LCD.
* Check wire connector.

No

No

No

* Check Q510, Q511 and D510.
* Check Q504, Q505 and D504.
* Check circuit around IC801.

* Check X501.
* Check circuit around X501 and IC502.

* Check circuit around IC502 pin 72.

2. “-- --” is not displayed total track numbers.

2

How long times it takes until “-- --” is
displayed after CD door has closed.

About
5 sec.

A B

12

About

16 sec.

2-A

A

Does the LASER emit ?

Yes

Dose the lens move

up and down ?

Yes

Load a disc and close CD door.
Then check the following.

Note: Open the CD door and check the radiation

!

power with an optical power meter or by watching
the radiaation through the lens of the pickup unit at
a minimum distance of 30cmfrpm the pickup.

!

No

A1

!

No

A2

SEL-GND

Figure 14

RFO-Vref

Figure 15

FEO-Vref

Figure 16

5V

1V

>0.4V

Is the waveform

at pin 21 (SEL) of IC501 like

that shown in Fig. 14 ?

Is the waveform

at R570 (RFO) like that

shown in Fig. 15 ?

Is the waveform

at pin 10 (FEO) of IC501 like

that shown in Fig. 16 ?

* Check around IC501.

Yes

Yes

Yes

No

* Check around IC501 and IC502.

* Check wire connector from pickup.

No

* Check IC501.
* Check pickup.

* Check around pins 8, 9 and 10 of

No

IC501.

* Check VR502.

13