Bang & Olufsen BeoLab 18, Service Manual

Page: 16 / 66

2.10 Fault flow chart
Fault symptom:
No sound from speaker in a wireless setup
Possible causes:
Defective PCB04, Power Supply
Defective PCB30, Digital Sound Engine
Defective PCB35, Amplifier
Defective PCB89, Wireless Power Link Rx
Incorrect role switch setting
No
Yes
Confirm that the
role switch setting
is correct
OK?
Set role switch
Confirm 28V at
PCB04, P4 pin 1,2
and -28V at PCB04,
P4 pin 7,8
OK?
Reset the speaker
and set up the
wireless connection
again.
OK?
Replace PCB04,
Power Supply
Replace PCB30,
Digital Sound
Engine
Confirm 3V at
PCB04, P3 pin 3
OK?
Check connection
between PCB04,
Power Supply and
PCB30, Digital
Sound Engine
OK?
Repair/replace
connection
Confirm 1.6V at
PCB89, P7 pin 22
and 3.3V at PCB89,
P7 pin 24
OK?
Connect Service -
Tool and read out
Error Log.
Any suggestions?
Replace PCB89,
Wireless Power
Link Rx
Replace the
suspected module
related to the
Error Log.
Replace PCB30,
Digital Sound
Engine
Replace PCB35,
Amplifier
Use ServiceTool to
calibrate the new
module
Disconnect W4
from PCB35, P3.
Confirm 28V at
PCB04, P4 pin 1,2
and -28V at PCB04,
P4 pin 7,8
OK?
Survey of plugs and pins - see page 2.13