Casio ZD-1 User manual
(without price)
ZD-1
MD CD SYSTEM
INDEX
Model-B: U.S.A.
Model-C: Europe
SEP.1998
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
CONTENTS
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.
IMPORTANT:
DEMONSTRATION
CONDENSATION
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
Figure 2
2
CD Door
Top Panel Kit
CaseKit
3. Open the CD door, remove four screws B holding the case kit.
1. Remove the battery cover and batteries.
2. Remove ten screws A holding case B unit.
Figure 1
Case B Unit
Battery Cover
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.
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.
3
Function Knob
Tuning Knob
CD Unit
Tuner Unit
CD
Mechanism
Set
AMP Unit
Top Case Assembly
Figure 3
MD Assembly
Case Assembly
Jog Knob
LED
PCB
I
Model-C only
Figure 4
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)
Figure 6
4
Varicon Gear
Tuner Gear
Pointer
Mark Tuner Chassis
K
Figure 5
Varicon Gear
Pointer
Varicon
Tuner Gear
L
Tuner Chassis
CD PICKUP REPLACEMENT
Precautions
To prevent damage caused by static electricity, the following procedures for grounding is required when opening
or repairing the unit.
Short-pad on pickup PCB
[Note] After the wire connector is
connected, desolder( short-pad).
1. Grounding for the human body
Be sure to put on a wrist-strap for grounding (with impedance lower than 106Ω) 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
10MΩafter connection to a suitable APC circuit.
Pickup
1. Wrist-Strap
for grounding
1MΩ
2. Conductive Sheet
5
1MΩ
BLOCK DIAGRAMS
Tuner
6
FM
AF
AM
AF
FM
IF
AM
IF
FM
RF
AM
OSC
FM
OSC PRE VCO Decode
SW
HYS
F.F
TUN
LED ST
LED FM
DET
AM/FM
SW
Level
DET
AM
DED
AGC
AM
MIX
FM
MIX
AM
RF In
FM
RF Out VCC1
FM
OSC AM
OSC DET
Out MPX In LPF1 LPF2 VCO
GND VCC R ch L ch
FM
RF In
GND1 FM MIX AM MIX AGC VCC2AM IF
In FM IF
In GND2 QUAD
31 2 4
To Amplifier Block
22 21 20 19 18 17 16 15 14 1324 23
D3
Loop Antenna
L2 L5 L4 L3
SW1
BAND SW
AM
FM-
Stereo
FM-MONO
Rod
Antenna
L8
CF1 CF2
L9
FM Signal
AM Signal
L7
1 2 3 4 5 76 8 9 10 11 12
AMP
7
STB
DATA
CK
BBS
AFMUTE
CN402
CN403
CN400
CN401
Equalizing
Circuit
Q200/Q300
Q201/Q301
Q203/Q303
Speaker
L ch
Speaker
R ch
J400
CN402
Lipple Filter Circuit
Q400/Q401
Q402/D400
MD Power Supply
Circuit
IC404
CN403
Power
Amplifier
Circuit
IC402
Mute
Circuit
Q204
Q304
Electron
Volume
Circuit
IC401
BBS
Circuit
Q202
Q302
Q403
Q404
Q405
CN402 Record Amplifier
IC403
V-BAT. Carcuit
D417/C421/R430
PSCONT
VCC 9V
(DC 7V)
CN404
CN402
EL Drive Power Supply Circuit
Q452/D450
MD Play L ch
MD Play R ch
CD Play L ch
CD Play R ch
Tuner In L ch
Tuner In R ch
Line In L ch
Line In R ch
MD Record L ch
MD Record R ch
MD V-BAT.
MD 5.5V (DC)
EL PS 3.5V
ELCONT
CD
8
PS Unit
AC9V
VCC9V
GND
Q711
Remote
Power
Control
Amp Unit
Display Unit
MD Unit
IC705
+5V
Power
Driver
+5V
IC709
MD
Bus
Level
Shifter
IC705
System
Reset
Circuit
Q709,710
Low Battey
Detect
Circuit
Q707,903
+9V
Power
Driver
SW701
Function
SW
Q708
Power
Control
Driver
+9V +5V +9V
+9V +9V
Q704,705
CD +9V
Power
Driver
+9V
IC708
CD +5V
Power
Driver
+5V
IC704
Micro
Processor X703
16MHz
X702
32.769KHz
Q713
Door SW
Driver
SW706
Door SW
Q901,902
Mute
Circuit
IC707
Analog
Filter
IC702
Digital
Signal
Processior
X701
16.93MHz
Q702
Laser
Power
Driver
Q701
Laser
Driver
Q702,703
Anti
Traverse
Circuit IC701
Servo
Signal
Processor IC703
Motor
Driver
CD
Mechanism
Laser
Coupler
Objective
Lens
MM
Disc
Motor Sled
Motor Reset
Switch
TEMP
2
1 TH501
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CN501
16P(FFC)
SYS_+3.3V
SYSTEM-RST
POWER-DOWN
VBAT
AMUTE
DETECTOR
IC505
BA10358
TO CD PCB
MD_MUTE
P_DOWN
TEMPDET
RTS.
TXD.
RXD.
CTS.
SYSTEM_RST
1
2
3
4
5
6
7
8
9
10
11
CN504
GND_UCOM
POWER
D502 D501
1SS133
INVERT
Q501
DA-RST
RXD
TXD
RTS
CTS
EMPHASIS
TO BD BOAD
(CN103)
TO MD BOAD
(CN102)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CN502
19P(FFC)
BCK
M-GND
ADDT OSC
IC502
TC7WU04 X501
22MHz
IC501
S-81340HG
SUPPLY
1
2
3
4
5
6
7
8
9
10
11
CN503
A_GND
M+5V.
MD_OUT(R)
MD_OUT(L)
TO AMP PCB
MUTE
CIRCUIT
Q504
Q502
Q503
VCC1
1
VCC1
2
VINR
3
VREF1
4
VREF2
5
VINL
6
1PDAD
7
1PDDA
8
SYSCK
9
LRCIN
10
BCKIN
11
DOUT
12 DGND 13
VDD 14
DIN 15
ZOBIT 16
DEM1 17
DEM0 18
VOUTL 19
VOUTR 20
VCOM 21
AGND2 22
AGND1 23
VCC2 24
IC503
PCM3003
3.3V-OUT
D-IN
M+5V
LRCK
M+5V
DADT
M-GND
GND
GND
D OUT
256FS
H+5V
512FS
H-GND
+5V
+5V
SYS_GND
H+5V.
A_IN(R)
A_IN(L)
DGND(M)
DGND(H)
+5
1
2
JOIN
FROM
CD PCB
WIRE
D_OUT(CD)
D_GND(CD)
MD Unit
9
Display Unit
(DB7)
(DB6)
(DB5)
(DB4)
(DB3)
(DB2)
(DB1)
(DB0)
(E)
(RW)
(RS)
(V0)
(5V)
(GND)
(GND)
(5V)
(KEYIN3)
(KEYIN2)
LCD Module
LC950 CN951
MD Out
Switch
SW962
CN953 Control Switch
Circuit
SW950~SW961 (KEYIN1)
(REMOTE)
(JOG1)
(JOG0)
(REMOPOWER)
CN952
From CD UNIT
Remocon Photoreceiver
IC951
Rotary Encoder
EN950
EL Panel
EL950
EL Draive Circuit
IC951 From AMP UNIT
(VCC)
(GND)
(EL-CONT)
(AC)
(GND)
(+8V)
To CD UNIT
CN101
C105
Rectification
Circuit
D101~D104
Fuse
F101
Power
TRANS.
T101
J101
AC Jack
Battery
9V
AC Cable
PS Unit
10
CD MD TEST
2) Test CD
The following Test CDs are available from A*BEX or parts center of Casio.
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.
1) Check of CD Mechanical Unit
Item Check Test CD Check Way
aInterruption in
Information Layer TCD-726
(A*BEX) By using track No.6 (0.5 mm), there shoud not be no noise and no
skip on the playback sound.
bBlack Dot on
Read Out Side TCD-726
(A*BEX) By using track No.13 (0.5 mm), there shoud not be no noise and
no skip on the playback sound.
c Finger Print TCD-726
(A*BEX) By using track No.18, there shoud not be no noise and no skip on
the playback sound.
dScratch on Read
Out Side TCD-721R
(A*BEX)
By using track No.9 (650 µm), there shoud not be no noise and
no skip on the playback sound.
e Eccentricity TCD-712R
(A*BEX) By using the disc (140 !5 µm), there shoud not be no noise and
no skip on the playback sound.
fVertical Deviation TCD-732RA
(A*BEX)
By using track No.2 (0.4 mm), there shoud not be no noise and no
skip on the playback sound.
gSound Skip for
Sound Pressure TCD-784
(A*BEX) By using track No.23 (20Hz~2kHz), there shoud be no noise and
no skip on the playback sound at volume Max./ BBS On.
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
Item Part code Part Name Specifications Test Purpose
11
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
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)
CD ADJUSTMENTS
12
Focus Servo E-F Balance Adjustment (Figures 8 and 11)
A
B
0V
(Vref)
A=B
Step Connect Setting Adjust Result
Play the regular disc.1See
Figure 8 VR702
Keep the button
depressed.
2
Oscilloscope CD PCB
GND
TP706
TP710
Figure 8
E-F balance signal
Step Connect Setting Adjust Result
Oscilloscope CD PCB
Adjust VR701 for the amplitude of the waveform
at maximum.
VR702
Measuring on oscilloscope.
Play the regular disc.See
Figure 7
1
0V >1.0V p-p
GND TP710
TP709
Figure 7
13
0V 250 mV p-p
Focus Servo Gain Adjustment (Figures 9 and 11)
Step Connect Setting Adjust Result
VR704Play the regular disc.
See
Figure 9
1
Oscilloscope CD PCB
TP750
GND TP710
Figure 9
GND
TP751
TP710
0V 100 mV p-p
Tracking Servo Adjustment (Figures 10 and 11)
Step Connect Setting Adjust Result
Oscilloscope CD PCB
VR703Play the regular disc.See
Figure 10
1
Figure 10
3
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.
If there is any skipping, adjust VR 703 to reduce the tracking servo gain until no skipping occurs.
14
CD Adjustment Points
Top View
Bottom View
Figure 11
VR703
VR704
VR702
VR701
TP751
TP709
TP706
TP710
TP750
CD TROUBLESHOOTING
15
Open CD door and set function switch
for CD position.
Is “CD OPEN”
display on LCD ? 1
3
Is the audio signal
present at the output
terminals ? 4
Press SEARCH key.
Can a selected
track number be searched
smoothly ? 5
OK
No
Yes
No
No
Yes
Yes
Yes
Load a disc close CD door.
No
Press PLAY/PAUSE key.
Are total track
number displayed?
2
Yes
No
Is “CD CLOSE”
display on LCD ?
L ch: CN709-9 pin
R ch: CN709-7 pin
1. “CD OPEN” is not displayed.
16
1
Is +5 V lines pin 72
of IC704 normal ?
No
Yes
*Check IC705.
*Check circuit around IC705.
Is the waveform
at pin 30 of IC704 like that
shown in Fig. 12 ?
No
Yes
*Check Q713.
*Check circuit around IC706.
Does 16 MHz
clock pulse appear at
pin 31of IC704 ?
No
Yes
*Check X703.
*Check circuit around X703.
*Check IC704.
*Check circuit around IC704.
*Check soldering CN705 and FFC.
Figure 12
5 V
Power on
100 mS
2. “CD CLOSE” is not displayed.
2
No
Yes
*Check IC704.
*Check circuit around IC704.
Is the waveform
at pin 43 of IC704 like that
shown in Fig. 13 ?
No
Yes
*Check Q713.
Does +5 V output
appear at pin 1 of
IC708 ?
No
Yes
*Check SW706.
*Check Q707, Q708 and Q903.
*Check circuit around Q707, Q708
and Q903.
Is the waveform
at base of Q713 like that
shown in Fig. 14 ?
Does +9 V
appear at pin 3 of
IC704 ?
No
Yes
*Check IC708.
*Check circuit around IC708.
Does +9 V
appear at emitter
of Q704 ?
No
Yes
*Check Q704 and Q706.
*Check circuit around Q704 and Q706.
17
Figure 13
5 V
Door close
Figure 14
5 V
Door close
3. Total track number is not displayed.
18
AC
About
6 sec About
15 sec
3
Check how much times it takes until “NO DISC” is
displayed after CD door has closed.
About
10 sec
B
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