Casio ZD-1 Service Manual

ZD-1

SEP.1998

(without price)

INDEX

Model-B: U.S.A.
Model-C: Europe

MD CD SYSTEM

CONTENTS

Specifications................................................................................................................................... 1

Disassembly Instructions ................................................................................................................. 2

Reassembly of Tuning Pointer ......................................................................................................... 4

CD Pickup Replacement .................................................................................................................. 5

Block Diagrams................................................................................................................................ 6

Tuner.......................................................................................................................................... 6

AMP ........................................................................................................................................... 7

CD.............................................................................................................................................. 8

MD Unit ...................................................................................................................................... 9

Display Unit .............................................................................................................................. 10

PS Unit ..................................................................................................................................... 10

CD MD Test ................................................................................................................................... 11

CD Adjustments ............................................................................................................................. 12

CD Troubleshooting ....................................................................................................................... 15

Operation Troubleshooting............................................................................................................. 25

PCB Views .................................................................................................................................... 26

Tuner PCB Top ........................................................................................................................ 26

AMP PCB Top.......................................................................................................................... 27

Display PCB Top/Bottom................................................................................................................ 28

MD PCB Top/Bottom...................................................................................................................... 29

CD PCB Top/Bottom ...................................................................................................................... 31

Wiring Diagram .............................................................................................................................. 33

IC Lead Identification and Internal Diagrams ................................................................................. 34

Schematic Diagrams ...................................................................................................................... 46

Tuner........................................................................................................................................ 46

AMP, PS................................................................................................................................... 47

MD ........................................................................................................................................... 48

CD............................................................................................................................................ 49

Front......................................................................................................................................... 50

Parts List ........................................................................................................................................ 51

Exploded Views.............................................................................................................................. 55

IMPORTANT:

DEMONSTRATION

CONDENSATION

When the power cord is plugged into an AC household outlet or the unit is loaded with the
batteries, Demonstration Mode starts. To cancel the Demonstration mode, press the
POWER button or hold the BBS button pressed for more than 3 seconds.

When the unit is moved to a location where the temperature is around 0 degrees C to a
warm location, the unit may not function properly. It is due to condensation generated
inside the unit. Leave the unit for about one hour to let it dry before normal operation.

SPECIFICATIONS

MD SECTION

System: MiniDisc digital audio system
Laser: Semiconductor laser
Error correction: Advanced cross interleave read Solomon code (ACIRC)
Channel: 2 channels
Frequency response: 20 to 20,000Hz +/-3dB
Wow and flutter: Less than measurement limit
Recording system: Magnetic field modulation overwrite method
Coding: Adaptive Transform Acoustic Coding (ATRAC)

CD SECTION

System: Compact disc digital audio system
Laser: Semiconductor laser
Channel: 2 channels
Frequency response: 20 to 20,000Hz !3dB
Wow and flutter: Less than measurement limit

TUNER SECTION

Tuning range: FM: 88 to 108MHz

AM: 530 to 1710kHz for Model-B
: 530 to 1600kHz for Model-C

Antenna: FM: Telescopic antenna

AM: Loop antenna (supplied)

GENERAL SECTION

Dimensions: 360 (W) x 158 (H) x 244 (D)
Weight: 4.0kg (without batteries)
Power source: AC 120V, 60Hz for Model-B

: AC 230V, 50Hz for Model-C
DC 9V, 6 x “D” size (R20P)
Power consumption: 21W
Output power: 2.5 (W) + 2.5 (W)

Design and specifications are subject to change without prior notice.

1

DISASSEMBLY INSTRUCTIONS

1. Remove the battery cover and batteries.

2. Remove ten screws A holding case B unit.

Case B Unit

Battery Cover

Figure 1

3. Open the CD door, remove four screws B holding the case kit.

CD Door

Top Panel Kit

CaseKit

Figure 2

2

4. Pull out the function knob and tuning knob.

5. Remove four screws C holding the tuner unit.

6. Remove four screws D holding the AMP unit.

7. Remove nine screws E holding the CD unit.

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

Function Knob

Tuning Knob

Top Case Assembly

9. Pull out the jog knob.

10. Remove six screws G holding the MD assembly.

11. Remove seven screws H holding the display unit.

12. Remove screw I holding the LED PCB.

AMP Unit

Figure 3

CD
Mechanism
Set

CD Unit

Tuner Unit

Model-C only

LED
PCB

Jog Knob

Figure 4

MD Assembly

I

Case Assembly

3

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, fixed the screws L ( tuner collar and tuner plate) and K. (refer figure 5)

K

Varicon Gear

Pointer

Tuner Gear

Varicon

Tuner Chassis

L

Figure 5

Pointer

Mark

Varicon Gear

Tuner Chassis

Tuner Gear

Figure 6

4

CD PICKUP REPLACEMENT

Precautions

To prevent damage caused by static electricity, the following procedures for grounding is required when opening
or repairing the unit.

1. Grounding for the human body
Be sure to put on a wrist-strap for grounding (with impedance lower than 106 Ω) whose other end is grounded.
The strap works to drain away the static electricity build-up on the human body.

2. Grounding for the work table
Be sure to lay on the table a conductive sheet (with impedance lower than 106 Ω) such as a sheet of copper
which is grounded.

3. As static electricity build-up on clothes is not drainded away, be careful not to let your clothes touch the unit.

4. The short-pad on the pick-up PCB of a spare part is short-circuited for protection during shipment. To open
the short circuit, remove the soldering quickly with a soldering iron whose insulation resistance is larger than
10MΩ after connection to a suitable APC circuit.

Short-pad on pickup PCB
[Note] After the wire connector is
connected, desolder( short-pad).

Pickup

1. Wrist-Strap
for grounding

1MΩ

1MΩ

2. Conductive Sheet

5

Tuner

BLOCK DIAGRAMS

Loop Antenna

L2 L5

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

OSC

AM

AF

AM

L3

AM
OSC

AM

DED

DET

Out

MPX In

PRE

FM

AF

AM/FM

SW

FM­Stereo

LPF1 LPF2

VCO

F.F

GND VCC R ch L ch

VCO

HYS

31 2 4

D3

Decode

SW

FM

RF

FM

MIX

1 2 3 4 5 76 8 9 10 11 12

Rod

Antenna

FM

RF In

GND1

L7

FM Signal
AM Signal

FM MIX AM MIX

AM

MIX

AGC

L8

AGC

AM

IF

VCC2

CF1

Level

DET

AM IFInFM IF

CF2

FM

IF

In

TUN
LED

GND2 QUAD

6

ST

LED

FM

DET

L9

AMP

Speaker

L ch

Speaker

R ch

J400

PSCONT

VCC 9V

CN403

STB

DATACKBBS

CN404

AFMUTE

Power

Circuit

Amplifier

Mute

Circuit

Circuit

Volume

Electron

BBS

Circuit

IC402

Q204

Q304

Q202

Q302

IC401

Q403

Q404

Q405

(DC 7V)

Q402/D400

Q400/Q401

Lipple Filter Circuit

IC404

Circuit

MD Power Supply

Circuit

Equalizing

CN402

MD Play L ch

MD Play R ch

Q200/Q300

Q201/Q301

Q203/Q303

CN403

CD Play L ch

CD Play R ch

CN400

Tuner In L ch

Tuner In R ch

CN401

Line In L ch

Line In R ch

7

IC403

Record Amplifier

CN402

MD Record L ch

MD Record R ch

V-BAT. Carcuit

D417/C421/R430

CN402

MD V-BAT.

CN402

MD 5.5V (DC)

Q452/D450

EL Drive Power Supply Circuit

ELCONT

EL PS 3.5V

CD

PS Unit

MD Unit

Display Unit

Amp Unit

Q711

Remote

Power

Control

SW706

Door SW

Q901,902

Mute

Circuit

Q702

Laser

Power

Driver

IC709

MD

Bus

Level

Shifter

Q713

Door SW

Driver

IC707

Analog

Filter

IC705

+5V
Power
Driver

+5V

IC705

System

Reset

Circuit

IC704

Micro

Processor

IC702
Digital
Signal

Processior

AC9V

Q709,710

Low Battey

Detect
Circuit

X703

16MHz

X702

32.769KHz

+5V

X701

16.93MHz

+9V

Q707,903

+9V
Power
Driver

Q708

Power

Control

Driver

IC708

CD +5V

Power
Driver

GND

VCC9V

+5V

Function

+9V

+9V

SW701

SW

+9V

Q704,705

CD +9V

Power
Driver

+9V

Q701

Laser

Driver

CD

Mechanism

Q702,703

Anti

Traverse

Circuit

Objective

8

Lens

IC701
Servo

Signal

Processor

Laser

Coupler

M

Disc

Motor

IC703
Motor

Driver

Motor

M

Sled

Reset

Switch

MD Unit

TH501

2

1

SYS_+3.3V

1
2
3

VBAT

4

SYSTEM-RST

5

POWER-DOWN

6
7
8

DA-RST

9

RXD

10

TXD

11
12
13
14
15
16

CN501
16P(FFC)

TO BD BOAD

(CN103)

TO MD BOAD

(CN102)
CN502

19P(FFC)

ADDT

1

M-GND

2

BCK

3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19

AMUTE

RTS
CTS

EMPHASIS

M-GND
DADT

M+5V
LRCK

M+5V
GND

GND

3.3V-OUT
D-IN
H+5V

D OUT
+5V

+5V

512FS

H-GND

256FS

INVERT

Q501

1
2

3

4
5
6
7

8
9

10

11

12

OSC

IC502

TC7WU04

IC503

VCC1
VCC1
VINR
VREF1
VREF2
VINL
1PDAD
1PDDA
SYSCK
LRCIN
BCKIN
DOUT

PCM3003

TEMP

DETECTOR

IC505

BA10358

X501

22MHz

24

VCC2

23

AGND1

22

AGND2

21

VCOM

20

VOUTR

19

VOUTL

18

DEM0

17

DEM1

16

ZOBIT

15

DIN

14

VDD

13

DGND

MUTE

CIRCUIT

Q502
Q503
Q504

D502

S-81340HG

D501

1SS133

POWER

SUPPLY

IC501

TO CD PCB

CN504

MD_MUTE

RXD.

TXD.
RTS.

SYSTEM_RST

P_DOWN

CTS.

TEMPDET

GND_UCOM

TO AMP PCB

CN503

MD_OUT(R)

A_GND

MD_OUT(L)

M+5V.

H+5V.

DGND(M)

DGND(H)

A_IN(R)

SYS_GND

A_IN(L)

11
10
9
8
7
6
5
4
3
2
1

1
2
3
4
5

+5

6
7
8
9
10
11

JOIN
WIRE
FROM

D_OUT(CD)
D_GND(CD)

CD PCB

1
2

9

Display Unit

MD Out

Switch

SW962

Rotary Encoder

LCD Module

LC950

EN950

CN953

Remocon Photoreceiver

IC951

CN951

Control Switch

Circuit

SW950~SW961

CN952

(DB7)
(DB6)
(DB5)
(DB4)
(DB3)
(DB2)
(DB1)
(DB0)
(E)
(RW)
(RS)
(V0)
(5V)
(GND)

(GND)
(5V)
(KEYIN3)
(KEYIN2)
(KEYIN1)
(REMOTE)

(REMOPOWER)

(JOG1)
(JOG0)

From CD UNIT

EL Panel

EL950

PS Unit

(AC)
(GND)
(+8V)

To CD UNIT

CN101

C105

EL Draive Circuit

Rectification

Circuit

D101~D104

IC951

10

Fuse
F101

(VCC)
(GND)

(EL-CONT)

Power

TRANS.

T101

From AMP UNIT

J101

AC Jack

AC Cable

Battery

9V

CD MD TEST

1) Check of CD Mechanical Unit
Item Check Test CD Check Way

Interruption in

a

Information Layer
Black Dot on

b

Read Out Side

c Finger Print

Scratch on Read

d

Out Side

e Eccentricity

Vertical Deviation

f

Sound Skip for

g

Sound Pressure

TCD-726

(A*BEX)

TCD-726

(A*BEX)

TCD-726

(A*BEX)

TCD-721R

(A*BEX)

TCD-712R

(A*BEX)

TCD-732RA

(A*BEX)

TCD-784

(A*BEX)

By using track No.6 (0.5 mm), there shoud not be no noise and no
skip on the playback sound.

By using track No.13 (0.5 mm), there shoud not be no noise and
no skip on the playback sound.

By using track No.18, there shoud not be no noise and no skip on
the playback sound.

By using track No.2 (0.4 mm), there shoud not be no noise and no
skip on the playback sound.

By using the disc (140 ! 5 µm), there shoud not be no noise and
no skip on the playback sound.

By using track No.9 (650 µm), there shoud not be no noise and
no skip on the playback sound.

By using track No.23 (20Hz~2kHz), there shoud be no noise and
no skip on the playback sound at volume Max./ BBS On.

2) Test CD

The following Test CDs are available from A*BEX or parts center of Casio.

Item Part code Part Name Specifications Test Purpose

a~c 1904 5424 Test CD TCD-726 (A*BEX) Defects Test

d 1904 5423 Test CD TCD-721R (A*BEX) Scratch Test
e 1904 5421 Test CD TCD-712R (A*BEX) Eccentric Test

f 1904 5422 Test CD TCD-732RA (A*BEX) Vertical Deviation Test

g 1904 5425 Test CD TCD-784 (A*BEX) Function Test

3) Check of MD Mechanical Unit

* MD Mechanical Unit cannot be adjusted in the field. Only the MD factory can adjust by using special equipment.

a. Playback Test

* Any regular music MD can be used. However the music MD should be supplied by Authorized Music Company, and the

surface of internal disk should be no scratch.
EX) Music MD SRLY-7233 (Sony) can be recommended.

* There should be no any noise on the playback sound for the aging check.

b. Record Test

* Any regular MD can be used. However the regular MD should be supplied by Authorized MD company, and the surface

of internal disk should be no scratch.
EX) Test MD MDW-74 (Sony) can be recommended.

* There should be no any noise on the playback sound after record for the aging check.

4) Test MD

The following Test MDs are available from A*BEX or parts center of Casio. However Test MDs of Sony cannot
be available from Casio.

Item Part code Part Name Specifications Test Purpose

a 1904 5428 Test MD TMD-321W (A*BEX) Scratch Test
b 1904 5429 Test MD TMD-325W (A*BEX) Defect Test
c 1904 5433 Test MD TMD-381 (A*BEX) Function Test

11

CD ADJUSTMENTS

Pre-Adjustment Procedures

* Remove the bottom chassis assembly. (Refer pages 3, 4)
* Use the plastic screwdriver.

Equipment Required

* Oscilloscope
* Screwdriver (Plastic type)

Focus Sarvo Offset Adjustment (Figures 7 and 11)

Step Connect Setting Adjust Result

1

Figure 7

Play the regular disc.See

VR702

Adjust VR701 for the amplitude of the waveform
at maximum.

0V

Measuring on oscilloscope.

Oscilloscope

CD PCB

TP709

GND

TP710

Figure 7

Focus Servo E-F Balance Adjustment (Figures 8 and 11)

Step Connect Setting Adjust Result

>1.0V p-p

Play the regular disc.1

See
Figure 8

2

Keep the button
depressed.

Oscilloscope CD PCB

VR702

GND

Figure 8

12

E-F balance signal

TP706

TP710

0V
(Vref)

A=B

A

B

Focus Servo Gain Adjustment (Figures 9 and 11)

Step Connect Setting Adjust Result

1

See

VR704Play the regular disc.

Figure 9

Oscilloscope CD PCB

GND

Figure 9

Tracking Servo Adjustment (Figures 10 and 11)

0V 250 mV p-p

TP750

TP710

Step Connect Setting Adjust Result

1

Figure 10

VR703Play the regular disc.See

0V 100 mV p-p

2 Swap the regular disc for the test disc A*BEX TCD-726 and play it at the black dod of 600 µm.

Confirm that there is no skipping.

3

If there is any skipping, adjust VR 703 to reduce the tracking servo gain until no skipping occurs.

Oscilloscope

GND

CD PCB

TP751

TP710

Figure 10

13

CD Adjustment Points

Top View

VR701

Bottom View

VR704

VR702

VR703

TP750

TP710

TP706

TP751
TP709

Figure 11

14

CD TROUBLESHOOTING

Open CD door and set function switch
for CD position.

Is “CD OPEN”

display on LCD ?

Yes

Load a disc close CD door.

Is “CD CLOSE”

display on LCD ?

Yes

Are total track

number displayed?

Yes

No

1

No

2

No

3

Press PLAY/PAUSE key.

Is the audio signal

present at the output

terminals ?

Yes

Press SEARCH key.

Can a selected

track number be searched

smoothly ?

Yes

OK

No

4

L ch: CN709-9 pin
R ch: CN709-7 pin

No

5

15

1. “CD OPEN” is not displayed.

1

Is +5 V lines pin 72

of IC704 normal ?

Yes

Is the waveform

at pin 30 of IC704 like that

shown in Fig. 12 ?

Yes

Does 16 MHz

clock pulse appear at

pin 31of IC704 ?

Yes

* Check IC704.
* Check circuit around IC704.
* Check soldering CN705 and FFC.

No

No

No

* Check IC705.
* Check circuit around IC705.

* Check Q713.
* Check circuit around IC706.

* Check X703.
* Check circuit around X703.

100 mS

5 V

Power on

Figure 12

16