Sony HT-MT300, Руководство по обслуживанию

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HT-MT300/MT301
24
SECTION 4
TROUBLESHOOTING
1. Protection mode is occurs after turning the power on.
When protection mode is occurs, all LEDs are fl ash for 10 seconds and turn the power off.
Note: Please remove the USB device before troubleshooting.
Protection mode is not occurs,
when removing the speaker
connection connector (CN1001) on
the MAIN board and turning the
power on.
Yes
Protection mode is occurs after
turning the power on.
No
Protection mode is occurs even after
replacing IC1001 on the MAIN board.
Yes
Check and replace the speaker
(SP1, SP2).
Replace the MAIN board.
Yes
2. The sound is not outputted
Yes
Check that the signals are inputted
to the following pins.
MAIN board: IC1000
pin 11, 22, 23, 24
Check that the signals are outputted
from the following pins.
MAIN board: IC1000
pin 40, 41, 48, 49
Yes
Check that the signals are outputted
from the following pins.
MAIN board: IC1001
pin 27, 28, 32
(front R-ch speaker)
pin 35, 39, 40
(front L-ch speaker)
Yes
Check the speakers' resistance are
not short-circuit (0
:
) or open (
f
).
Reprogram the IC2000 (serial flash) on
the MAIN board and check the signal
again.
No
Replace the IC2003 on the MAIN board
and check the signals again.
Replace the MAIN board.
Abnormality
Abnormality
Replace the IC1000 on the MAIN board.
No
Replace the IC1001 on the MAIN board.
No
Replace the speakers (SP1, SP2)
No