MHC-V77DW
28
Playback the music.
Ye
s
Ye
s
The voltage between pin 7 to 8 (+VH) and pin 5 (PGND) of
CN1004 on the 2CH DAMP
board is +62.5 V
.
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The voltage between pin 6 (+VL) and pin 5 (PGND) of
CN1004 on the 2CH DAMP
board is +17 V
.
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The audio is outputted
from the 2CH DAMP
board.
No
Ye
s
Reinsert the wire that connected between CN1004 on the
2CH DAMP
board and switching regulator
, and check the
voltage again.
If there is no problem to the wire, check that the switching
regulator is properly fixed.
No
No
No
Reinsert the flexible flat cable (FFC4) that connected between
CN1001 on the 2CH DAMP
board and CN6404 on the
MOTHERBOARD board, and check the voltage again.
If there is no problem to the flexible flat cable (FFC4), check
that the MOTHERBOARD board is properly fixed.
No
No
No
The voltage between pin 1 (-VG) and pin 5 (PGND) of
CN1004 on the 2CH DAMP
board is -45.5 V
.
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Checks OUT terminal REG IC1001 output is -50.5 V
reference to pin 5 (PGND) of CN1004.
Checks circumference circuit of REG IC1001.
If there are no problems, exchanges IC1001.
No
Checks OUT terminal REG IC1002 output is +7 V reference
to pin 5 (PGND) of CN1004.
Checks circumference circuit of REG IC1002.
If there are no problems, exchanges IC1002.
No
Checks OUT terminal REG IC1003 output is -7 V reference
to pin 5 (PGND) of CN1004.
Checks circumference circuit of REG IC1003.
If there are no problems, exchanges IC1003.
Ye
s
Ye
s
Ye
s
No
Checks OUT terminal REG IC1006 output is +9 V reference
to pin 5 (PGND) of CN1004.
Checks circumference circuit of REG IC1006.
If there are no problems, exchanges IC1006.
No
Checks OUT terminal REG IC1007 output is +15 V reference
to pin 5 (PGND) of CN1004.
Checks circumference circuit of REG IC1007.
If there are no problems, exchanges IC1007.
Replace 2CH DAMP
Board.
No
Check the voltage of CN1001 pin 7 (I_AMP_RESET) on the
2CH DAMP
board is +3.3 V
.
Ye
s
Leave 2CH DAMP
Mount to a state of it only and checks
Power
Audio Driver (MOSFET) with T
ester
.
Is it shorted out? (Refer to Page 29)
Assembles into the unit again then, checks whether there is
audio output from 2CH DAMP
Board.
Ye
s
End
2CH DAMP
Board Mount Diagnosis Flow
