Fault flow chart 2.9
Survey of plugs and pins - see page 2.11
Reset the speaker
and set up the
wireless connection
again
OK?
Replace PCB30,
Digital Sound
Engine
*
Fault symptom:
No sound from speaker in a wireless setup
Possible causes:
Defective PCB04, Power Supply
Defective PCB30, Digital Sound Engine
Defective PCB35.1/2, Amplifier
Defective PCB89, Wireless Power Link Rx
Incorrect role switch setting
Confirm that the
role switch setting
is correct
OK?
No
Set role switch
Confirm
+28V at PCB04,
P15 pin 1, 2 and
-28V at PCB04,
P15 pin 8, 9
OK?
Confirm
+28V at PCB04,
P16 pin 1, 2 and
-28V at PCB04,
P17 pin 8, 9
OK?
Yes
Check cables W2,
W9 and W10 and
connections to
speaker units and
PCB02.1, Input
Panel
Confirm
P15V = 15V at
PCB04, P14 pin 5
OK?
Confirm
PS_ON = 3.3V at
PCB04, P14 pin 7
OK?
Connnect to a
source via:
Wireless
Replace PCB35.1,
Amplifier
*
Replace PCB35.2,
Amplifier
*
Replace PCB04,
Power Supply
Disconnect W6 from PCB35.1, P3.
C28V at PCB04, P15 pin 1, 2
and -28V at PCB04, P15 pin 8, 9
OK?
(Reconnect W6 after test)
Disconnect W8 from PCB35.2, P3.
C28V at PCB04, P17 pin 1, 2
and -28V at PCB04, P17 pin 8, 9
OK?
(Reconnect W8 after test)
Check connection
between PCB04,
Power Supply and
PCB30, Digital
Sound Engine
OK?
Repair/replace
connection
OK?
Connect ServiceTool and read out Error Log.
Replace the suspected module related to the
Error Log *
OK?
Replace PCB04,
Power Supply
Confirm
1V2 = 1.2V at
PCB89, P7 pin 22
and 3V3 = 3.3V at
PCB89, P7 pin 24
OK?
Replace PCB89,
Wireless Power
Link Rx
Replace PCB30,
Digital Sound
Engine
*
*
Use ServiceTool to
autocalibrate the
new module
Summary of Contents for BeoLab 20
Page 6: ...1 4 ...
Page 18: ...2 12 2 12 2 12 ...
Page 28: ...4 4 Replacement of modules BeoLab 20 in service position 1 Pull to remove fabric frame ...
Page 50: ...4 26 ...
Page 54: ...5 4 ...
Page 56: ...6 2 6 2 6 2 ...
Page 66: ...7 9 ...
Page 67: ......
Page 68: ...Bang Olufsen DK 7600 Struer Denmark 3538228 14 04 353822814040000 ...