No Function Of The Pcb7, Ntc; No Function Of S And S2 - Bang & Olufsen BeoLab 9 6217 Service Manual

2.6 Fault flow chart
Fault symptom:

- No function of the PCB7, NTC

Possible cause:
- PCB7, NTC
- Cable W4
- Module 999, Amplifier
Is the loudspeaker in
protection mode?
Visual confirm cable
connection between Reconnect/replace
Module 999, Amplifier
and PCB7, NTC
To confirm correct operation of the NTC, measure
approx. 9.35V DC at normal room temperature, as
shown in fig 
(When the temperature is rising, the DC voltage is
going towards 0)
Note:
When the loudspeaker goes into protection mode,
it is nescessarry to disconnect mains and wait one
minute before connecting it again.
Fault symptom:

- No function of S and S2

Possible cause:
- Module 999, Amplifier
Is there no function of Replace Module 999,
switch S and/or S2?
Replace PCB7, NTC
cable
Amplifier
Fig
Red
Black
Replace Module 999,
Amplifier
No
Yes