Trouble Shooting; The Power Can Not Be Turned On; The Power Turned On, But A Sound Does Not Output Normally. (Both Channels) - Denon PMA-2020AE Service Manual

TROUBLE SHOOTING

1. The power can not be turned on. (Power indication LED does not light.）
Check the insertion of the 8U-110132-6 AC UNIT.
Check the insertion of the 8U-110132-2 UCOM
UNIT.
Check whether power is being supplied to the
coil of the standby transformer (T101).

2. The power turned on, but a sound does not output normally. (Both channels)

Set remains in standby mode with power indicato
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.
20
Broken wire in standby
transformer (T101).
Malfunction of D101-106,
C105 or C106.
Malfunction of, U601 or
S101.
Damaged power amplifier
circuit.
Damaged temperature
detection circuit or
protection circuit.
Damaged power amplifier
circuit.
Check the bias current.