Sony HT-ST9, Руководство по обслуживанию

Страница: 53 / 94

HT-ST9
53
SECTION 4
TROUBLESHOOTING
1. “PRTCT” is displayed on the OLED display after turning the power on
“PRTCT”, “PUSH” and “POWER”
display alternately in the OLED
display after turning the power on.
Yes
“PRTCT”, “PUSH” and “POWER” is
not displayed alternately in the
OLED display, when removing the
speakers (SP1 to SP10) and
turning the power on.
No
Replace the IC7004, IC7005,
IC7007, IC7008 on the AMP board. IC7004, IC7005, IC7007, IC7008
on the AMP board is burned out.
Yes
Yes
Check and replace the speakers
(SP1 to SP10) and connection
cable (SPC1 to SPC4).
The voltage of the following is 3.3 V.
MB1406 board: IC3004 pin 96
(DRIVER_SD) The voltage of the following is 3.3 V.
MB1406 board: IC3004 pin 50
(DC_DET)
No
The voltage of the following is 12 V.
AMP board:
IC7004, IC7005,
IC7007, IC7008 pin 2
No
Yes
No
No
No
No
OUT_D line (pin 27, 28), OUT_C
line (pin 32), OUT_B line (pin 35)
and OUT_A line (pin 39, 40) of
IC7004, IC7005, IC7007, IC7008
on the AMP board do not
short-circuits or opens.
If there is no abnormality, replace
the IC7004, IC7005, IC7007,
IC7008 on the AMP board.
Replace the IC7004, IC7005,
IC7007, IC7008 on the AMP board.
Yes
Yes
Mounted parts on the INPUT_D line
(pin 15), INPUT_C line (pin 14),
INPUT_B line (pin 6) and INPUT_A
line (pin 5) of IC7004, IC7005,
IC7007, IC7008 on the AMP board
short-circuits or opens.
The PWM signal is inputted
INPUT_D line (pin 15), INPUT_C
line (pin 14), INPUT_B line (pin 6)
and INPUT_A line (pin 5) of IC7004,
IC7005, IC7007, IC7008 on the
AMP board.
Repair the short-circuit and opening
of mount parts.
Yes
Check and repair the IC7001 and
surrounding circuit on the AMP
board.
Check and repair the IC7006 and
surrounding circuit on the AMP
board.
A
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