Denon PMA-2020AE - Troubleshooting Guide; Power On Failure (No LED); No Sound Output (Dual Channel)

20
TROUBLE SHOOTING
1. The power can not be turned on. (Power indication LED does not light.
）
2.2.
2.3.
Check the insertion of the 8U-110132-6 AC UNIT.
Set remains in standby mode with power indicato
LED lit red.
Check the insertion of the 8U-110132-2 UCOM
UNIT.
Power indicator LED remains flashing red and
muting mode is not canceled (protection mode is
set).
Set operates, but then power indicator LED
ashes red (protection mode is set).
Check each connector.
Check whether power is being supplied to the
coil of the standby transformer (T101).
Check the power amplier output's offset voltage.
Check the power amplier output's offset voltage.
Power not supplied.
Offset voltage output is 1V
or greater.
Offset voltage output is 1V
or greater.
The connectors are
inserted completely.
Broken wire in standby
transformer (T101).
Damaged power amplier
circuit.
Damaged power amplier
circuit.
Malfunction of, U601 or
S101.
Power supplied.
No offset voltage is output.
No offset voltage is output.
Malfunction of D101-106,
C105 or C106.
Damaged temperature
detection circuit or
protection circuit.
Check the bias current.
2. The power turned on, but a sound does not output normally. (Both channels)