Marantz PM-10 Service Manual page 47

3. STANDBY LED flashes while using the unit
Check insertion of each connector.
4. The power turns on but no sound is output
4.1. No sound is output from one channel.
Check insertion of each connector.
OK
Is no sound output with other input sources?
OK
AUDIO IN PCB
Is there sound from [N5009 : 1, 3pin and N5010 :
1, 3pin]?
OK
AUDIO IN PCB
Malfunction of amplifiers circuit.
(Protection circuit becomes activated)
OK
See "2. The power cannot be turned on (STAND-
BY LED is lit → light flashes)"
NG
Check the input changeover relay [S4501-S4504,
S2001-S2005] and the peripheral circuit.
NG
Power amplifier module
Malfunction of amplifiers circuit.
4.2. There is no sound from both channel.
Check insertion of each connector.
OK
Do you hear the operation sound of the input
changeover relay when rotating the Input Selec-
tor knob?
OK
Do you hear the operation sound of the Mute
relay in about 25 seconds after turning on the
unit?
OK
AUDIO IN PCB and RCA PCB
Is power being supplied ( ± 20V, ± 15V,+5V)?
47
NG
AUDIO IN PCB
Malfunction of [U2501, U2502].
NG
AUDIO IN PCB
Malfunction of mute relay [S5001, S5002] or the
driving circuit.
NG
POWER PCB
Check the pre-amplifier power supply circuit.