2.8 Fault flow chart
Confirm:
+12V at PCB04, P4
pin 1
-12V at PCB04, P4
pin 3
OK?
Fault symptom:
No power ON
Red LED indication
Possible causes:
Defective PCB04, SMPS
Defective PCB30, DSE
C5V_Stb at
PCB04, P4 pin 9-10
OK?
Disconnect W9
from PCB30, P5
C5V_Stb at
PCB04, P4 pin 9-10
OK?
Connect the cable
for ServiceTool to
the service
connector
Does the product
switch on?
Fault in PowerLink
connection/source
Check connection
C3V at
PCB04, P4 pin 8
OK?
Confirm:
+33V at PCB04, P3
pin 4
-33V at PCB04, P3
pin 2
OK?
Confirm mains
voltage at PCB04,
P1 pin 1-2
OK?
Replace defective
PCB04, SMPS
Fault in cable
connection
Repair/replace
connection
Replace defective
PCB30, DSE
Replace defective
PCB30, DSE
No
Yes
Replace defective
PCB30, DSE
Replace defective
PCB04, SMPS
Disconnect W3
from PCB04, P3
C33V at
PCB04, P3 pin 4
-33V at PCB04, P3
pin 2
OK?
Replace defective
PCB04, SMPS
Fault in one of the
three PCB35,
ICEpower amplifiers
Disconnect one by
one and replace the
defective module
PCB04, P4, pin information - see next page
Summary of Contents for BeoLab 12-3
Page 6: ...1 4...
Page 24: ...2 18...
Page 50: ...5 8...
Page 59: ......
Page 60: ...Bang Olufsen DK 7600 Struer Denmark 3538176 12 02...