Bang & Olufsen BeoLab 17, Руководство по обслуживанию, Страница: 12 / 72

2.6 Fault flow chart
Fault symptom:
No function and no LED indication
Possible causes:
Defective PCB04, Power Supply
Defective PCB30, Digital Sound Engine
Defective PCB35, Amplifier
Incorrect role switch setting
** Confirm 5V_SB
at PCB04, P3 pin 6
OK?
No
Disconnect cable
W4 from PCB04 P3
Confirm 5V_SB at
PCB04, P3 pin 6
OK?
Confirm 3V at
PCB04, P3 pin 3
OK?
Is the speaker in a
wireless setup
Confirm that the
wired connection
between speaker
and the source
product is OK
OK?
Replace PCB35,
Amplifier
Use ServiceTool to
calibrate the new
module
Confirm 28V at
PCB04, P4 pin 1,2
and -28V at PCB04,
P4 pin 7,8
OK?
Replace PCB30,
Digital Sound
Engine
OK?
Confirm that the
wireless connection
between the speaker
and the transmitter
is OK
OK?
Repair/setup the
wireless connection
Repair/replace
connection
Confirm mians
voltages at PCB04,
P1 pin 1-2
OK?
Replace PCB04,
Power Supply
Fault in cable
connection
Repair/replace
connection
Replace PCB30,
Digital Sound
Engine
Yes
Replace PCB04,
Power Supply
Disconnect W4 from PCB35, P3.
Confirm 28V at PCB04, P4 pin 1, 2
and -28V at PCB04, P4 pin 7, 8
OK?
Fault flow chart
Survey of plugs and pins - see page 2.13
**
Set BeoLab 17 in service position 2
for measuring on modules. See
replacement of modules page 4.8
Confirm that the
role switch setting
is correct
OK?
Confirm that the
role switch setting
is correct
OK?
Set role switch
Set role switch
Replace PCB35,
Amplifier
Use ServiceTool to
calibrate the new
module