10
PMA-710AE
TROUBLE SHOOTING
1. The power can not be turned on. (Power indication LED does not light.)
2. The power turned on, but a sound does not output normally. (Both channels)
2.1.
2.2.
2.3.
Check the insertion of the Power Part.
Check whether power is being supplied to the coil
of the standby transformer (T901).
Power not supplied.
Broken wire in standby trans-
former (T901)
Power supplied.
Malfunction of D941-944, C941
or C943.
Set remains in standby mode with power indicator
LED lit red.
Check each connector.
The connectors are inserted
completely.
Malfunction of RC71 or IC41.
Power indicator LED remains flashing red and
muting mode is not canceled (protection mode is
set).
Check the power amplifier output's offset voltage.
Offset voltage output is 1V or
greater.
Damaged power amplifier cir-
cuit.
No offset voltage is output.
Damaged temperature detec-
tion circuit or protection circuit.
Set operates, but then power indicator LED
flashes red (protection mode is set).
Check the power amplifier output's offset voltage.
Offset voltage output is 1V or
greater.
Damaged power amplifier cir-
cuit.
No offset voltage is output. Check the bias current.
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