Trouble Shooting - Pioneer CB-A802 Service Manual

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7.1.8 TROUBLE SHOOTING

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START
Turn on the power again
after 2 - 3 minutes.
Is LCD turn on ?
Yes
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Is the indication
of LCD normal ?
Yes
Is tray open ?
Yes
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Power ON
• Remote control unit or IR signal line damaged.
• Blow out fuse of the primary side
• Blow out micro-fuse on the POWER SUPPLY Unit. (Check the each voltage.)
• Check the following connections :
No
• Check each voltage regulators of DVDM Assy :
• Check each voltage (EV+6V, EV+4V, SW+3.3V, SV+12V, IC402-pin 1 (+5V) and
No
LCD indication is dark or flickers.
Clock generator IC481 or crystal resonator X471 is damaged.
Check waveform of each pin whether IC481 does oscillation.
Indicates the error message
• Blow out micro-fuse on the POWER SUPPLY Unit.
• Check the following connections :
No
• Check the loading drive signal : IC351-pin 14, 15 and 16
• Check the +6V and +12V power supply voltage
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(When key input of the remote control unit is not completed)
P202 or P301 of the POWER SUPPLY Unit is damaged.
Is a voltage of CN101-pin 7 (P-CONT) of the POWER SUPPLY Unit about 3.3 V?
POWER SUPPLY Unit - DVDM Assy
DVDM Assy - AJKB Assy
DVDM Assy - VJKB Assy
DVDM Assy - FLKY Assy
IC401-pin 3 (+3.3V), IC402-pin 1 (+5V), IC403-pin 3 (+2.5V), IC404-pin 4 (+3V),
IC405-pin 4 (+5V), IC410-pin 1 (+1.8V), IC411-pin 3 (+2.5V)
SW+5V)
(If above voltage are not supplied, check the micro-fuse P101, P201, P202, P301.)
Are not there short and open-circuit between output connector of CN101 of POWER
SUPPLY Unit and CN401 of DVDM Assy?
Q Q
3 6 7 1 3
(P202 and P301)
DVDM Assy (CN103)- LOAB Assy (CN601)
DVDM Assy CN115-pin 12 (INSIDE SW signal)
(If above voltage is not supplied, check the micro-fuse P202 and P301.)
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DVD-V8000
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• LCD module is damaged.
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• Check the address bus and data bus of signal
interface between LCD microcomputer (IC1501)
– AV1 (IC751), FR CPU (IC601), Eby-Chip
(IC701) and Servo DSP (IC201) on the DVDM
Assy.
• Check each voltage regulators of DVDM Assy :
IC401 (+3.3V) and IC403 (+2.5V)
Refer to the section "7.1.5 ERROR DISPLAY".
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