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Only for training and service purposes
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4. TROUBLE SHOOTING
BL20
48/53
4.18 Speaker phone path
QSC6270 SPK C528,C529
Æ
C517,C518(DNI)
Æ
Audio Sub System(IC500)
Æ
CN501
Æ
Speaker pad( FPCB)
Start
Connect the phone to network
equipment and setup call
Setup 1KHz tone out
Sine wave appears at
C517,C518?
YES
NO
NO
Change the Main board
Sine wave appears at
SPK Pad?
YES
NO
Sine wave appears at
C528,C529?
YES
NO
Change QSC6270
Change Main PCB
Change audio sub system
Change FPCB