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Level 3 Repair
8-14
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8-3-1-6 Main Key Working
Key FPCB
Disconnect or
Break Down ?
Check HDC602
& Neighboring Circuits
Connect
correctly or
Change Key FPCB
Yes
NO
Press Main Key
NG
Signal in D601,D6
02,D603,D604,D60
5,D606,D607,D608?
Yes
NO
Check UCP300
(open, short, etc)
NO