Troubleshooting - Denon PMA-710AE Service Manual

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