No Red Light In Standby - Bang & Olufsen BeoLab 9 6217 Service Manual

2.2 Fault flow chart
Fault symptom:

- No red light in STANDBY

Possible causes:
- Fuse F
- PCB4, Power Supply
- Module 999, Amplifier
Connect a Master Link cable from e.g. a
BeoSound 4, to BeoLab 9. Make sure that S0
is set to either L or R. Connect mains to BeoLab 9.
Is there red light in the LED on top of BeoLab 9?
Confirm mains in the
mains wire
Confirm mains on
PCB4, Power Supply
P3 pin and 2
Confirm 5V on PCB4,
Power Supply P4
pin
Confirm 4.2V on
PCB, Cross Over P9
pin 2
Replace PCB3, LED
Reconnect mains
If possible, check fuse
Replace fuse F
F on PCB, Cross
Over
Replace PCB4, Power
Supply
Replace Module 999,
Amplifier
Note:
Ground is
chassis
No
Yes