Bang & Olufsen BeoSound 9000 MKIII, Service Manual

Page: 88 / 97

5.62 Error tree Error tree 5.62 5.62
Are there 5Vpp
impulses on 35CP1?
YES
YES
YES
YES YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO NO
NO
NO
NO
NO NO
NO
NO
NO
NO
NO
NO
NO
Check optocouplers on PCB30 & 31 and
their signal path on PCB22. If this is OK,
then PCB35 (MOTOR CONTROL) is defective.
Does playback
begin (sound) ?
PCB32
(IN/OUTPUT SELECT)
defective
PCB41
(DISC DETECTOR)
defective
Check radial
servo and motor
Turntable motor def.
Signal on 32P26 pin 1
& 2 OK? (digital signal)
Does CD stop with-
in app.5 seconds?
Choose another CD.
Is the previous CD
placed correctly?
PCB35
(MOTOR CONT.)
defective
PCB35
(MOTOR CONT.)
defective
Measure 41P42 pin 3 &
laser on 41P42, pin 7.
Is there 5Vpp?
PCB41 (CD) defective
(Radial motor may
be short circuited)
PCB41
(DISC DETECTOR)
defective or
supply missing
PCB41 (CD)
defective
PCB41 (CD)
defective
PCB41 (CD)
defective
PCB9 or PCB35
defective
CD-mechanism def.
CD-mechanism def.
CD-mechanism def.
Does the CD rotate?
Does the display show
"LOAD DISC"?
Enter Test Mode: (SHIFT, 9,0,2,5,8)
Push CD, 66, 65.
Does laserarm move back and forth?
Repeat Test Mode 65, 66.
Measure between pin 3 and 4 of 41P45.
Is there app. 3.5V pp?
PCB27 or PCB28
defective
Sledge motor
defective
Push 61. Is there
light in the laser?
(Use Test Mode)
Is Focus Search visible?
(Use Test Mode)
Start Turntable Motor (Test Mode 63, see Service
manual for instructions!) Measure 41P99
pin 1, 2 and 3. Is there app. 6V pp?
Measure at 41P42
pin 15 & 16.
Is there app. 2.5V?
Choose another CD
(corr. placed) Does the
sledge move to the CD?
Does the sledge
move uncontrolled?
Remove 35P53.
Apply 9V directly to the sledge motor.
Does the sledge try to move (It may be locked!)
Disconnect 26P96. Short circuit the socket 26P96
pin 1 & 4. Be careful not to damage the socket.
Are there 5 V impulses on 35CP1?
PP
Randomly place a CD from the CD-library.
Choose the CD and push ST.BY.
Is the CD placed correctly? Check if there is a 5V
pulse during lead-in
on a CD (35P50-15).
PCB41 (CD)
defective
From previous page
PCB35
(MOTOR CONTROL)
defective