Bang & Olufsen BeoLab 17, Руководство по обслуживанию, Страница: 15 / 72

Fault flow chart 2.9
Survey of plugs and pins - see page 2.13
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?
No
Set role switch
** Confirm 28V at
PCB04, P4 pin 1, 2
and -28V at PCB04,
P4 pin 7, 8
OK?
Yes
Connect
ServiceTool and
read out Error Log.
Any suggestions?
Replace the
suspected module
related to the
Error Log
Replace PCB30,
Digital Sound
Engine
Replace PCB35,
Amplifier
Use ServiceTool to
calibrate the new
module
Replace PCB04,
Power Supply
Replace PCB30,
Digital Sound
Engine
Disconnect W4
from PCB35, P3.
Confirm 28V at
PCB04, P4 pin 1, 2
and -28V at PCB04,
P4 pin 7, 8
OK?
Confirm 3V at
PCB04, P3 pin 3
OK?
Check connection
between PCB04,
Power Supply and
PCB30, Digital
Sound Engine
OK?
Repair/replace
connection
**
Set BeoLab 17 in service position 2
for measuring on modules. See
replacement of modules page 4.8