No Sound From Speaker In A Wired Setup - Bang & Olufsen BeoLab 18 Service Manual

Fault symptom:

No sound from speaker in a wired setup

Possible causes:
Defective PCB04, Power Supply
Defective PCB30, Digital Sound Engine
Defective PCB35, Amplifier
Incorrect role switch setting
Confirm that the
role switch setting
is correct
OK?
Confirm 28V at
PCB04, P4 pin 1,2
and -28V at PCB04,
P4 pin 7,8
OK?
Connect Service-
Tool and read out
Error Log.
Any suggestions?
Replace the
suspected module
related to the
Error Log.
Set role switch
Disconnect W4
from PCB35, P3.
Confirm 3V at
PCB04, P3 pin 3
Confirm 28V at
PCB04, P4 pin 1,2
and -28V at PCB04,
P4 pin 7,8
OK?
Replace PCB04,
Replace PCB35,
Power Supply
Amplifier
Use ServiceTool to
calibrate the new
module
Replace PCB30,
Digital Sound
Engine
Check connection
between PCB04,
Power Supply and
PCB30, Digital
Sound Engine
OK?
OK?
Replace PCB30,
Digital Sound
Engine
Fault flow chart
No
Yes
Repair/replace
connection
Survey of plugs and pins - see page 2.13
2.9