Bang & Olufsen BeoLab 9 Service Manual download pdf (Page 9)

Fault ﬂow chart 2.3

Select e.g. Radio or

CD on the

Audiomaster, and

press GO on Beo4

Does BeoLab 9 turn

on (Green light in

LED)

Conﬁrm 5V on PCB4,

Power Supply P14 pin

7

Check Power Link

cable and

Audiomaster.

Reconnect/replace if

nescessarry.

(This is not covered in

this fault ﬂow chart)

Conﬁrm -12V on

PCB4, Power Supply

P14 pin 3

Replace PCB4, Power

Supply

Replace PCB4, Power

Supply

No

Yes

Conﬁrm 44V on PCB4,

Power Supply P15

pin 4

Replace PCB4, Power

Supply

Conﬁrm -44V on

PCB4, Power Supply

P15 pin 5

Go to

next page

Conﬁrm 12V on

PCB4, Power Supply

P14 pin 5

Replace PCB4, Power

Supply

Conﬁrm 66V on

PCB4, Power Supply

P15 pin 6

Replace PCB4, Power

Supply

Conﬁrm approx 4.7V

on PCB4, Power

Supply P14 pin 9

Replace PCB4, Power

Supply

Replace Module 999,

Ampliﬁer

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 39 40

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