2.10 Fault flow chart
Fault symptom:
Missing, atttenuated or distorted sound from
speaker and no error indication in error logs
Possible causes:
Defective PCB04, Power Supply
Defective PCB30, Digital Sound Engine
Defective PCB35.1/2, Amplifier
Defective PCB89, Wireless Power Link Rx
Defective speaker unit
Check cables and
connections to all
speaker units
OK?
Distorted sound
from woofer
?
Reconnect or
replace cables
OK?
Replace PCB30,
Digital Sound
Engine
*
C28V at
PCB04, P17 pin
1, 2 and -28V at
PCB04, P4 pin 8, 9
OK?
Replace PCB04,
Power Supply
Replace PCB30,
Digital Sound
Engine
*
Confirm
PS_ON = 3.3V at
PCB04, P14 pin 7
OK?
Check connection
between PCB04,
Power Supply and
PCB30, Digital
Sound Engine
OK?
Repair/replace
connection
Confirm
1V2 = 1.2V at
PCB89, P7 pin 22
and 3V3 = 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
*
Disconnect W8 from PCB35, P3.
C28V at PCB04, P17 pin 1, 2
and -28V at PCB04, P17 pin 8, 9
OK?
(Reconnect W8 after test)
Survey of plugs and pins - see page 2.11
C28V at
PCB04, P15 pin
1, 2 and -28V at
PCB04, P4 pin 8, 9
OK?
Replace PCB35.1,
Amplifier
*
Replace PCB35.2,
Amplifier
*
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)
Go to
#3
Go to
#3
From
#3
If problem persists, check
PCB35.1 Amplifier, PCB35.2 Amplifier speaker
units and cables W2/W9.
Replace suspected modules or cables *
OK?
Make an autocali-
bration using the
ServiceTool.
Successful?
Check
PCB30, Digital Sound Engine, PCB35.1 Ampli-
fier, PCB35.2 Amplifier and cables W5/W7.
Replace suspected modules or cables
OK?
Go to
#2
From
#2
*
Use ServiceTool to
autocalibrate the
new module
No
Yes
Содержание BeoLab 20
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Страница 28: ...4 4 Replacement of modules BeoLab 20 in service position 1 Pull to remove fabric frame ...
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Страница 68: ...Bang Olufsen DK 7600 Struer Denmark 3538228 14 04 353822814040000 ...