Casio ZD-3 Service Manual
(without price)
ZD-3
MD CD SYSTEM
SEP. 2000
INDEX
Specifications................................................................................................................................... 1
Disassembly Instruction ................................................................................................................... 2
Reassembly of Tuning Pointer ......................................................................................................... 5
Block Diagrams................................................................................................................................ 6
Tuner.......................................................................................................................................... 6
AMP ........................................................................................................................................... 7
MD ............................................................................................................................................. 8
CD.............................................................................................................................................. 9
VR, Display , PS........................................................................................................................ 10
CD Pickup Replacement ................................................................................................................ 11
Tuner Adjustments......................................................................................................................... 12
Troubleshootings............................................................................................................................ 16
CD............................................................................................................................................ 16
MD ........................................................................................................................................... 25
PCB Views ..................................................................................................................................... 30
Tuner/SW PCB Top View ......................................................................................................... 30
AMP/Jack PCB Top View ......................................................................................................... 31
VR PCB Top View .................................................................................................................... 32
PS/SW A/SW B PCB Top View................................................................................................ 33
CD/Door PCB Top/Bottom Views ............................................................................................. 34
Display PCB Top/Bottom Views ............................................................................................... 36
BD PCB Top/Bottom Views ...................................................................................................... 37
Wiring Diagram .............................................................................................................................. 39
IC Lead Identification and Internal Diagrams ................................................................................. 40
Schematic Diagrams ...................................................................................................................... 57
Tuner........................................................................................................................................ 57
AMP ......................................................................................................................................... 58
CD............................................................................................................................................ 59
MD ........................................................................................................................................... 61
VR, LCD................................................................................................................................... 63
Exploded Views.............................................................................................................................. 64
Unit Assembly .......................................................................................................................... 64
Case Unit ................................................................................................................................. 67
Top Case Unit .......................................................................................................................... 68
MD Mechanism Unit................................................................................................................. 69
CD Mechanism ........................................................................................................................ 70
Parts List ........................................................................................................................................ 71
CONTENTS
1
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 20,000 Hz ! 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
Fequency response: 20 to 20,000 Hz ! 3dB
Wow and flutter: Less than measurement limit
TUNER SECTION
Tuning range: FM: 88 to 108 MHz
AM: 530 to 1,600 kHz
Antenna: FM: Telescopic antenna
AM: Loop antenna (supplied)
GENERAL SECTION
Dimensions: 354 (W) x 155 (H) x 253 (D)
Weight: 3.7 kg (without batteries)
Power source: AC 230V, 50 Hz
DC 12V, 8 x “D” size (LR20)
Power consumption: 22W
Output power: 2.0 (W) + 2.0 (W)
Accessories: AC power cord
AM loop antenna
Instruction manual
Design and specifications are subject to change without prior notice.
IMPORTANT: This product is capable of substantial uses
that do not constitute infringement under the copyright
laws. It is sold for such uses, and it should not be used to
infringe the copyrights of others.
DISASSEMBLY INSTRUCTIONS
1. Remove the battery cover.
2. Remove eight screws A holding the case B unit.
3. Open the CD door and remove three screws B holding the case ass’y.
2
Case B ass’y
CD door
Top case ass’y
Case ass’y
A
A
A
B
B
D
D
C
E
F
F
3
4. Remove four screws C holding the MD holder A
and MD mechanism ass’y.
5. Remove five screws D holding the display unit.
6. Remove the three PCB supports holding AMP
PCB. (reffer figure)
Display unit
MD Holder A
MD Mechanism ass’y
AMP PCB ass’y
PCB
support
Case ass’y
Pinch the under PCB supports.
7. Remove four screws E holding the front panel ass’y.
8. Remove eight screws F holding the SP panel ass’y.
Case ass’y
SP panel ass’y
Front panel ass’y
G
M
M
L
L
K
H
J
J
9. Pull out the two volume key ass’y , function key and band key.
10. Remove screw G holding the door SW PCB.
11. Remove six screws H holding the CD unit ass’y.
12. Remove four screws J holding the ESD spacer and tuner unit ass’y.
13. Remove five screws K holding the VR unit ass’y .
14. Remove two screws L holding the CD mechanism stopper.
15. Remove for screws M holding the CD mechanism ass’y.
4
Volume key ass’y
Function key
Band key
Volume key ass’y
Door SW PCB
VR unit ass’y
Tuner unit ass’y
CD
mechanism
ass’y
CD mechanism
stopper
CD
mechanism
stopper
ESD spacer
CD unit ass’y
Top case ass’y
1
2
3
4
5
REASSEMBLY OF TUNING POINTER
1. Turn the varicon unclockwise stop position.
2. Set the tuner gear figuer position and fixed the screw.
3. Fixed the tuner chassis on the tuner PCB. (three screws)
4. Set the pointer to the tuner chassis mark position.
5. Fixed the tuner shaft screw A.
Tuner shft
Tuner gear
Mark
Pointer
Tuner chassis
Tuner PCB
Screw A
5
Varicon
BLOCK DIAGRAMS
TUNER
6
Decode
TUN
LED
ST
LED
Level
DET
AM RFInFM RF
Out
RF VCCFM
OSC
AM
OSC
DET
Out
MPX
In
LPF1
LPF2
GND VCC R ch L ch
FM
RF In
RF
GND
AM Low
Cut
MIX Out
AGC
V
CC
AM IF
In
FM IF
In
GND
QUAD
To Amplifier Block
19 18
17
16 15
14
1324
Bar
Antenna
L1
L4
L3
SW1
BAND SWAM
FMStereo
FM-MONO
FM
Antenna
CF1
CF2
FM Signal
AM Signal
L6
1
3
4 5
76
8
9 10
11
12
AM
MIX
FM
RF
23
2122
FM
OSC
20
AM
OSC
FM
MIX
2
AGC
AM
DET
FM
Mute
AF
BUFF
AM
IF
FM
IF
FM
DET
AF
VCO
Divice
ST/MO
FM/AM
CF3
TUN
LED
ST
LED
31 2 4
CN3
AM Loop Antenna
SURROUND
BBS
AFMUTE
CN303
CN301
CN302
Equalizing
Circuit
Q101, Q201
Speaker
L ch
Speaker
R ch
J301
Lipple Filter Circuit
Q303, Q304
MD Power Supply
Circuit
IC303
CN307
Power
Amplifier
Circuit
IC302
Mute
Circuit
Q104,
Q204
BBS
Circuit
IC301
CN303
Record Amplifier
IC300
(DC 7V)
CN301
CN303
MD Play L ch
MD Play R ch
CD Play L ch
CD Play R ch
Tuner In L ch
Tuner In R ch
MD Record L ch
MD Record R ch
MD 5V (DC)
Rotary
Volume
CN304
Surround
Circuit
Q301, Q302
AMP
7
CN301
RX1
From CD DOUT
BD UNIT
MDOUT L
ADIN L
AGND
ADIN R
MDOUT R
DGND
HGND
MGND
D+5V
H+5V
M+5V
CN601
MD MUTE
RXD
TXD
RTS
RST
P DOWN
CTS
TEMP DET
CN402
H+5V
M+5V
D+5V
D+3V
A+3V
Power
Supply
IC601
DRAM
IC302
AD/DA
IC501
LPF
IC502
DSP
IC301
System
Control
IC401
RF-AMP
IC101
EEPROM
IC402
OPT
PU
M+5V
Motor
Driver
IC202
M
Loading
FO
TR
CN401 CN201
M
M
Spindle
Sled
CN401
PROTECT
REFRECT
CHACK IN
REC P
PB P
LIMIT IN
M+5V
H+5V
Head Coil
Driver
IC102, Q105,
Q106
Motor
Driver
IC402
CN102
MD MECHA UNIT
OW Head
MD
8
4754-032-0
Q702,
Q703
to MD
CN705
to Front
to MD Control
to AMP
Q706, Q707
PS DET Circuit
to VOL
+3.3V
+8.0V
+3.3V
TR-
TR+
FO-
FO+
PD
LD
FEDBC
A
CN701
to Pick Up
to Mecha
KSM-213CJM
PSET
SPSPSL
SL
CN702
1
654
3
212210
9
28277
6
151416
13
12
10
Q701
Laser
Power
Control
PD
LD
F
E
PD2
PD1
83467
5
35
34
393837
36
OUT3+
OUT3-
OUT2+
OUT2-
OUT4+
OUT4-
OUT1-
OUT1+
IC703
BA6898S
Pick Up Mother Driver
VIN-3
VIN-2
VIN4
VIN-4
VIN-1
IC710
BA4510F
Tracking Assist
Circuit
19
11
29
30
4
IC701
CXA2542AQ
System Servo Processor
FEO
TA-O
SL-O
SL-P
TEO
RFO
CLK
XLT
DATA
C-OUT
SENS1
FOK
XRST
SENS2
5
12
15
41
311819202223252124
13
GFS
RF
IC702
CXD3009Q
Digital Signal Processor
SPOA
MDP
DOUT
LOUT1
ROUT2
SCOR
SQCK
SQSO
DATA
XLAT
CLOK
SENS
XRST
FOK
15
21
CN704
1
53
49
35
67
74
CN703
4
2
6
1
7
5
SW701
Door SW
49
644745272625242829
23
SCOR
SQCK
SQSO
DATA
XLT
CLK
SENS1
XRST
FOK
SENS2
DOOR SW
AFMUTE
LMUTE
SURROUND
BBS
RST
PSDET1
PWR/KEY
KEY3
PS-CONT
F TUNER
FMD
FCD
TEMP
DET
PDOWN
RESET
CTS
RTS
TXD
RXD
MUTE
DB3
DB2
DB1
DB0
E
CLK
KEY0
KEY1
KEY2
IC704
CXP740056
Sistem Control
CN706
63
66
67
65
68
70
69
80
8
6
5
4
7
2
3
1
18
17
16
15
14
13
62
61
60
3
4
5
6
7
8
11
12
13
IC707
S-80727AL-AQ-T1
Reset
CN707
Q708, Q709, Q710
REG CD Driver
IC709
PQ15RW11
REG-CD System
IC708
PQ15RW11
REG-Sistem
1
2
97
96
40
79
84
59
9
91
92
93
86345911
12
57
45789
6
79
18
CD
9
4754-015-0
To
VR Unit
(GND)
(VCC)
WC 400
(C406)
Rectification
Circuit
D402~D405
Fuse
F401
Power
TRANS.
T401
J401
AC Jack
AC Cable
LCD Module
LCD950
LCD Driver
IC950
WC950
(GND)
(3.3V)
(DB3)
(DB2)
(DB1)
(DB0)
(E)
(CLK)
Control
Switch Circiut
SW970~SW974
SW980~SW984
SW990~SW994
(GND)
(KEYIN)
(KEYIN)
(KEYIN)
(VCC9V)
Stand-by LED
LD950
From CD Unit
From
AMP
Unit
(VCC9V)
(DC9V)
(GND)
(TU9V)
(MD9V)
WC307
WC304
Rotary Volume
With
Loundness
VR350
Control Switch
Circuit
SW350~SW352
Lipple Filter
Circuit
Q350, Q351,
Q352
Function
Switch
S353
WC350
From CD Unit
(VCC9V)
(GND)
(Power Key)
(Key IN3)
(PS CONT)
(DC9V)
(GND)
(CD9V)
(F TU)
(3.3V)
(F MD)
(F CD)
CN400
From
PS
Unit
(VCC9V)
(GND)
VR
DISPLAY
PS
4754-009-0
4754-036-0
10
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.
11
Short-pad on pickup PCB
[Note] After the wire connector is
connected, desolder( short-pad).
1. Wrist-strap
for grounding
2. Conductive sheet
Pickup
12
TUNER ADJUSTMENTS
Remarks:
* When aligning the range and adjusting tracking, proceed with alignment in a sequence of AM t FM.
* Use a screwdriver with a plastic grip for all alignments.
Equipment Required
* AM signal generator (AM SG)
* Loop antenna
* Output meter
* Oscilloscope
* FM signal generator (FM SG)
* Screw driver (Plastic type)
* Dummy load 32 Ω
AM IF Alignment (Figures 1 and 3)
Step
Alignment
Frequency
of signal
generator
Tuning
dial
setting
Adjustment Remarks
IF calibratoion
1000 KHz 1000 end L6 Obtain sine-wave and
maximum amplitude.
AM Alignment (Figures 1 and 3)
Figure 1
Max.
13
Adjustment of
tracking
530 KHz
Low End
L2
Obtain sine-wave and
maximum amplitude.
1
1600 KHz
High End
AM-OSC2
3 Repeat the above adjustments.
Step Alignment
Frequency
of signal
generator
Tuning
dial
setting
Adjustment
Remarks
Tuning range
calibration
600 KHz 600 KHz L1
1
2 1400 KHz 1400 KHz AM-ANT
Max.
Output meterAM SG Loop antenna
Set
Osilloscope
Dummy load
32 Ω
60 cm
J301
Headphone jack
GND
Loop antenna
(Accessory)
CH1
FM Alignment (Figures 2 and 3)
Output meterFM SG Set Oscilloscope
Dummy
load
32 Ω
GND
Figure 2
FM dummy load
R1=Output impedance
of FM SG
R2=75 Ω - R1/2 Ω
FM ANT
GND
R1
R2
Adjustment of
tracking
88 MHz
Low End
L3
Obtain sine-wave and
maximum amplitude.
1
108 MHz
High End
FM-OSC2
3 Repeat the above adjustments.
Step Alignment
Frequency
of FM signal
generator
Tuning
dial
setting
Adjustment
Remarks
Tuning range
calibration
90 MHz 90 MHz L4
1
2 106 MHz 106 MHz FM-RF
Max.
4754-022-0
14
J301
Headphone jack
C28
C31
R3
CF3
IC1
C30
CF2
R4
Q1
C29
R16
L6
R15
R14
R21
C6
C5
C34
C19
C20
C6
C7
BF1
C21
R5
CF4
CF1
R12
C12
C27
D3
D4
CN1
CN2
D2
D1
C10
L5
C8
C11
L1
L4
R1
C4
C2
R8
L3
C14
R6
C3
D5
R2
C7
VC1
L2
R13
C18
C20
D8
C19
TUNER PCB
4754-520-2-91
CN3
R11
CN4
C16
C33
C32
R17
C24
R18
C13
R7
C25
C15
C17
C22
C26
R9
R10
C23
1
12
13
24
TUNER ADJUSTMENT POINTS (TUNER PCB)
15
Top View
Figure 3
FM RF
FM OSC
AM ANT
AM OSC
RF GND
FM ANT AM ANT
GND
TROUBLESHOOTINGS
Is ” NO DISC”
displayed after “READ”
displayed ?
1
Is the audio signal
present at output
terminals ?
3
5
OK
No
Yes
No
No
Yes
Yes
2
Yes
NoAre total track
numbers and playing
time displayed ?
Can FR and FF be
operated normally ?
Can track number be searched
smoothly ?
4
No
Yes
Power switch on and set function
switch for CD position.
Press FR or FF button.
Turn jog knob to left or right.
Does the audio signal
(digital) present at output
terminals ?
Record on MD from CD.
Load a disc close CD door.
Press CD “ / “ button.
16
CD
Is system +3.3 V lines
normal ?
No
Yes
* IC708 or IC709 is defective.
* Check circuit around IC708 and IC709.
Is pin 40 (RESET)
of IC704 high ?
No
Yes
* IC707 is defective.
* Check circuit around IC707.
Does 12 MHz
clock pulse appear at
pin 43 of IC704 ?
No
Yes
* X702 is defective.
* IC704 is defective.
* Check circuit around X702 and IC704.
* Check IC704.
* Check circuit around IC704.
Repair Item 1: ” NO DISC” is not displayed after “ READ” displayed.
A B
Less than
8 sec
More than
8 sec
2
Check how long it takes until “ NO DISC” is
displayed after CD door has closed.
Repair Item 2: Total track number and playing time are not displayed.
1
Note: That shows the time it takes until “ NO DISC” is displayed from when CD tray has been closed perfectly.
Check pickup whether there is it at home position.
!
!
!
17
Repair Item 2-A
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 30cm from the pickup.
Does the LASER emit ?
Dose the lens move
up and down ?
Load a disc and close CD door.
Then check the following.
Is the waveform
at pin 25 (FOK) of IC701 like
that shown in figure 5 ?
* IC701 is defective.
Is the waveform
at pin 31 (RFO) of IC701 like
that shown in figure 4 ?
* Check FFC connector (CN701) from
pickup.
* Check soldering IC701. IC702 and
IC703.
* IC701 is defective.
* Pickup is defective.
Is the waveform
at pin 48 (FEO) of IC701 like
that shown in figure 6 ?
* Check soldering pins 25, 26 and 27
of IC701.
* IC701 is defective.
* Check circuit around IC801.
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Figure 4
Figure 5
E
3.3V
!
!
!
E=nearly 1V
Is the waveform
at pin 1 (FEI) of IC701 like
that shown in figure 7 ?
No
Yes
Figure 6
>2V
Figure 7
>1V
* Check circuit around pins 1 and 48 of
IC701.
A
A1
A2
18
1.6VVC3.6VVC
Figure 20
Is pin 34 of IC701
more than 2.0V at
playing ?
* Check circuit around pin 34 of
IC701.
* Check digital signal pins 18, 19
and 20 of IC701.
* Check FFC connector (CN701).
* Pickup is defective.
No
Yes
Repair Item 2-A2: The lens does not move up and down.
Is waveform at
pins 13 and 16 of CN701 like that
shown in figuer 8 ?
* Check FFC connector
from pickup.
* Pickup is defective.
Is waveforn at
pin 5 (FEO) of IC701 like
that shown in figuer 9 ?
No
No
Yes
Yes
* Check circuit around
IC701.
* IC701 is defective.
* Check circuit around
and soldering pin 16 of
IC701.
* IC701 is defective.
* IC702 is defective.
Figure 21
Is emitta of Q701
3.3V ?
* Check soldering Q701.
No
Yes
Repair Item 2-A1: The laser does not emit.
A1
A2
19
Repair Item 2-B
Watch the waveforn at pin 31 (RFO) of
IC801 an oscilloscope.
Is waveform at
pin 35 (RF) of IC702 like that
shown in figure 10 ?
Is pin 49(GFS) of of IC702
high ?
* Check circuit around C and pin 35 of
IC702 (RF).
* IC702 is defective.
* Check pins 29, 30 and 31 of IC702.
* Check pins 17 and 49 of IC702.
* IC702 is defective.
No
No
Yes
Yes
Figure 10
Waveform
Does 16.93 MHz appear
at pin 70 (XTAL) of IC702 ?
Yes
* Check crystal and circuit
around it.
* IC702 is defective.
* Check circuit around and
soldering IC702.
* IC702 is defective.
0.9 Vp-p
~
1.1 Vp-p
No
Waveform
B
C
20
Repair Item: 2-C
Is waveform
at pin 41 (TEO) of IC701 like that
shown in figure 11 ?
Is waveform
at pin 12 (TAO) of IC701 like that
shown in figure 12 ?
Is waveform at
pins 27 and 28 of IC703 like that
shown in figure 13 ?
* Check FFC connector (CN701).
* IC701 is defective.
* Check circuit around TEO line.
* Check circuit around and soldering pins 22,
23, 24 and 42 of IC701.
* IC701 is defective.
* Check circuit around IC703.
* Check FFC connector (CN701).
* Pickup is defective.
No
No
No
Yes
Yes
Yes
Figure 11 Figure 12 Figure 13
C
21
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