Cd Test Mode - Aiwa CDC-Z127 Service Manual

CD TEST MODE

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3 7 63 1515 0
1. Starting CD Test Mode
1) Remove the resistance (100KΩ) on 63 pin (test) line of IC 901
(LC72358N) located on the main circuit board, and connect
73 pin (VDD) and 63 pin line with a wire.
2) Connect the ACC (red) /BATT (yellow) wire to the positive terminal of Power Supply device,
and the GND (black) wire to the negative terminal.
3) Adjust the applied voltage of Power Supply device to 14.5V, and
then turn on the power.
Test mode starts, and all LCD are lit.
Refer to Fig-2.
2. Exiting CD Test Mode
1) Turn off the power of Power Supply device.
2) Remove connector Assy wires.
3) Remove the wire of the main circuit board.
3. Function of CD Test Mode
MODE Function Key
TE
L 13942296513
Start Mode
Load/Unload
EJECT
Search Mode
6
Play Mode
REP1
Traverse Mode
INT
STOP
4
Sled Mode
Note 1: • Check Search Mode without inserting any CD.
• To exit Search Mode, insert a CD or press the POWER button to turn off the power.
• When Search Mode operates continuously more than 10 minutes, the protection circuit is activated due to heat generation of
the driver IC, and CD stops operating.
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In this case, turn off the power, wait for approximately 10 minutes so that heat is released, and then restart.
Note 2: • To exit Play mode, press the POWER button to turn off the power.
.
Note 3: • To exit Traverse Mode, switch to Play Mode or press the POWER button to turn off the power.
Note 4: • Be sure to insert a CD to check the movement of Play Mode and Sled Mode.
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Display
All lit.
All lit.
All lit.
RNDM
TOC Reading
5
Track No,
Play time display
Level display
Track No,
3
Play time display
All lit.
All lit.
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y
i
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8
Movement
Q Q
3 6 7 1 3
Chacking
Continuous focus search
PU lens repeats full swings.
(Note 1)
Normal playback
If TOC READ is not available,
the movement during search
mode is applied. (Note 2)
Playback pause mode (Note 3)
Standby mode
Pickup moves to the
outermost position.
Pickup moves to the
innermost position.
(Note 4)
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.
– 41 –
2 9 9 4 2 8
REMOVE 100KΩ
PIN63
PIN73
IC901
Fig-1
Fig-2
Details
1 5 0 5 8 2 9 9 4
Test mode starts.
All servo OFF
Laser ON
VCC ON
Check APC circuit.
Measure the level of
laser current electricity.
Check focus error wave forms.
Focus servo
Tracking servo
CLV servo
Sled servo
Tracking servo OFF
All servo OFF
Laser ON/OFF
Sled servo
Check mechanism movement.
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co
9 9
Add Wire
2 8 9 9