Diagnosis; Troubleshooting - Pioneer HTP-072 Service Manual

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5. DIAGNOSIS

5.1 TROUBLESHOOTING

A
No Power
This is just for general reference and does not including every single case.
No Power
Is Stand by?
(or ON → Stand by)
No
B
C
Is the fuse (F301) open?
No
Is the voltage +5.6 V?
(STBY Assy CP701
pins 6, 9)(C301 +side)
Yes
Is the voltage +10 V?
(FRONT Assy
CN701 pins 1, 4)
Yes
D
Is the voltage +10 V?
(FRONT Assy
CN705 pins 21, 22)
Yes
Is the voltage +10 V?
(CPU Assy
CN704B pins 21, 22)
Yes
Is the voltage +3.3 V?
(STBY Assy
IC301 pin 2)
Yes
E
Is the voltage +3.3 V?
(FRONT Assy
CN701 pin 5)
Yes
Is the voltage +3.3 V?
(FRONT Assy
CN705 pins 16, 17)
Yes
Is the voltage +3.3 V?
(CPU Assy
CN704B pins 16, 17)
F
Yes
Replace CPU Assy.
18
1
2
Yes
Is the error indicated?
(HDMI LED flashing?)
Yes
AMP DC Protention works.
Disconnect speaker cables if you connect speakers.
(Prevention of Speaker destruction.)
Cancel the DC detection. Refer to "6. [3] 3.4 How to
cancel the status after detection of the DC error".
Does DC Protection work
when power ON again?
Yes
Refer to "5.2 [1] Overload and DC Protection Circuit",
Diagnosis AMP6 Assy and MAIN Assy.
Yes
Check D303 to D308, PT301, IC301
on STBY Assy or replace STBY Assy.
No
Replace STBY Assy.
No
Check cable connection between CP701 on STBY Assy and
CN701 on FRONT Assy. If it is OK, replace that cable.
No
Check +10V line on FRONT Assy
or replace FRONT Assy.
No
Check connection betwwern CN705 on FRONT Assy
and CN704B on CPU Assy.
No
Check IC301 on STBY Assy or
replace STBY Assy.
No
Check cable connection between CP701 on STBY Assy and
CN701 on FRONT Assy. If it is OK, replace that cable.
No
Check +3.3V line on FRONT Assy
or replace FRONT Assy.
No
Check connection betwwern CN705 on FRONT Assy
and CN704B on CPU Assy.
2
3
No
Other trouble.
No
Connect speakers, and check that sound output does
not have any problem.
HTP-072
3
4
If the connection check is NG, check the FFC cabel
between CN705 and CN704B or replace the FFC cable.
If the connection check is NG, check the FFC cabel
between CN705 and CN704B or replace the FFC cable.
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