Trouble Shooting - Pioneer DV-S755AI Service Manual

1

7.1.8 TROUBLE SHOOTING

START
Power ON
A
Turn on the power again
after 2 - 3 minutes.
B
Is FL turn on ?
Yes
C
Is the indication
of FL normal ?
Yes
D
Is tray open ?
Yes
E
F
86
1
2
• Tact-switches are damaged. (incase of only a key NG)
FLKY IC101-pin 22 is it around +1.2V when you pushed a POWER key?
• Wireless remote controller receiver or IR signal line or SEL IR signal line is damaged.
(incase of only a key of wireless remote controller NG)
Does FLKB IC101-pin 17 (SEL IR) and IR and SEL IR signal lines change 0V–3.3V
when you pushed a wireless remote controller key?
• Blow out fuse of the primary side
• As for P-CONT of POWER SUPPLY Unit is around 3.3V. Blow out micro-fuse on the
POWER SUPPLY Unit. (Check the each voltage.)
P101–P102 or POWER SUPPLY Unit is damaged.
• FL controller IC (IC101) or RESET IC (IC102) on the FLKY Assy is damaged.
Are IC101-pin 12 (XRESET) and pin 11 (POWER ON) "H" level together?
• Check the following connections :
POWER SUPPLY Unit - DVDM Assy
DVDM Assy - JACB Assy
DVDM Assy - FLKY Assy
• Check each voltage regulators of DVDM Assy :
No
IC791-pin 1 (+1.8V), IC404-pin 4 (+3.3V), IC402-pin 1 (+5V), IC403 (+2.5V)
• Check each voltage (EV+6V, EV+4V, SW+3.3V, +12V, -28V, FLDC+ and FLDC-)
(If above voltage are not supplied, check the micro-fuse P101–P104.)
Are not there short and open-circuit between output connector of POWER SUPPLY
Unit and CN401 of DVDM Assy?
• R103 of POWER SUPPLY Unit is damaged. No -28V voltage appear.
No
FL indication is dark or flickers.
Clock generator IC481 or crystal resonator X481 is damaged.
Check waveform of each pin whether IC481 does oscillation.
Indicates the error message
• Blow out micro-fuse on the POWER SUPPLY Unit.
(P101 and P102)
• Check the following connections :
DVDM Assy (CN103)- LOAB Assy (5P connector assy)
No
DVDM Assy CN105-pin 12 (INSIDE SW signal)
• Check the loading drive signal : IC351-pin 14, 15, 16
• Check the +6V and +12V power supply voltage
(If above voltage is not supplied, check the micro-fuse P101 and P102.)
2
3
• Short or open the zenner diode on the POWER
SUPPLY Unit. (D302)
• Check the address bus and data bus of signal
interface between FR CPU (IC601)–AV1 (IC751),
Eby-Chip (IC701) and Servo DSP (IC201).
• Check each voltage regulators of DVDM Assy :
IC404 (+3.3V) and IC403 (+2.5V)
Refer to the section "7.1.6 ERROR DISPLAY".
DV-757Ai
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4
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