Casio PZ-700 User manual

PORTABLE CD PLAYER
INDEX
Model-C: Europe
Model-E: Other Countries
PZ-700
(without price)

Disassembly Instructions.............................................................................................................. 1
CD Adjustment ............................................................................................................................... 2
Block Diagram ................................................................................................................................ 3
Troubleshooting............................................................................................................................. 4
PCB Views ...................................................................................................................................... 7
CD AMP PCB Top View.............................................................................................................7
CD AMP PCB Bottom View........................................................................................................ 8
Wiring Diagram............................................................................................................................... 9
Schematic Diagram...................................................................................................................... 10
Parts List....................................................................................................................................... 11
Exploded View.............................................................................................................................. 13
CONTENTS

DISASSEMBLY INSTRUCTIONS
1. Remove four screws A holding the top case.
2. Remove the CD mechanism.
3. Remove the CD AMP PCB.
1
Upper case
CD AMP PCB
Lower case
CD mechanism
A
A
A
A

CD ADJUSTMENT
Precautions
To prevent damage caused by static electricity, the following procedures for grounding is requir or repairing the
unit.
[Note] Remove the connection after installed.
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.
Equipment Required
*Multi Meter
*Oscilloscope
*Compact Disc
*Dummy Load 10 kΩ
Shorting tab
Desolder here
Pickup
1. Wrist-Strap
for grounding
1MΩ
1MΩ2. Conductive Sheet
2
Pickup

3
BLOCK DIAGRAM
CD Mechanism
Disc
Pickup
Spindle
Motor M
Head AMP
AN8806SB
Driver
AN8819NFB Digital Servo
Processing
Digital Signal
Processing
DF-DAC
TX
R ch
L ch
Microcomputer
MN150413 (4 bits)
LCD KEY
Super 1chip digital servo processor
MN662740RE

TROUBLESHOOTING
Is “00” displayed
on the LCD ? 1
Are total track
number displayed ? 2
Is the audio signal
present at the headphone
terminal ? 3
Press or key.
Can a selected
track number be searched
smoothly ? 4
Is “BATT”
displayed on the LCD ? 5
OK
No
Yes
No
No
No
No
Yes
Yes
Yes
Yes
4
Press the “PLAY/PAUSE” key.
Load a CD and close the CD door.
*Only when batteries are in the
CD player and AC adaptor is
connected.
Set “CHARGE” switch “ON”.

Yes
Yes
Repair Item 1: At power on, “00” is not displayed.
Repair Item 2: Total track number is not displayed.
5
1
Is the switch
“HOLD” set “OFF” ? No *Set the “HOLD” switch “OFF”.
Is the voltage
3.25 !0.1V at terminal
TP1 ?
No *Check IC502.
*Check the circuit around IC502.
*Check the Q401, Q402, T401 circuit.
Does clock
pulse appear at pin 15 of
IC801 ?
No *Check IC601.
*Check the X601.
*Check the circuit around IC601.
Yes
*Check IC801.
*Check the circuit around IC801.
*Check LCD801.
Yes
Yes
2
No
No *Check IC502.
*Check the circuit around IC502.
*Check IC501 and IC601.
*Check the circuit around IC501 and
IC601.
Does the LASER emit ?
*Check >3V appears at pin 3 of IC501.
*Check IC501.
*Check Q501.
Does the lens move
up and down ?

Repair Item 3: The audio signal is not present in headphone Terminal.
6
Is the audio signal
present in “LINE OUT”
jack ?
3
*Check IC601.
*Check the circuit around IC601.
Yes
*Check IC301.
*Check the circuit around IC301.
No
Repair Item 4: A selected track number can’t be searched.
*Check the pickup.
*Check the FL wire connector.
*Check IC502.
4
Repair Item 5: “BATT” is not displayed on the LCD.
Is the level
“LOW” at pin 35 of
IC801 ?
5
*Check Q404.
*Check S402.
Yes
*Check LCD801.
*Check IC801.
No

PCB VIEWS
CD AMP PCB Top View
7

CD AMP PCB Bottom View
8