Bang & Olufsen BeoLab 9 6217, Service Manual

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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?
Reconnect mains
Confirm mains on
PCB4, Power Supply
P3 pin and 2
If possible, check fuse
F on PCB, Cross
Over
Replace fuse F
Replace PCB4, Power
Supply
Confirm 4.2V on
PCB, Cross Over P9
pin 2
Replace Module 999,
Amplifier
Replace PCB3, LED
No
Yes
Confirm 5V on PCB4,
Power Supply P4
pin
Confirm mains in the
mains wire
Note:
Ground is
chassis