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