Read Panasonic KX-AT7730RU Service Manual online
17
KX-AT7730 Series
7 Troubleshooting Guide
7.1.
NO OPERATION
Yes
No
Is 6-24 V input at the Pin1 of IC7?
Check D2.
No
Check IC7.
No
Yes
Is +6 V output at the Pin3 of IC7?
Yes
Does an oscillation signal (20 MHz) appear
at Pin7 (OSC1) of IC1?
at Pin7 (OSC1) of IC1?
No
Check IC1, IC2 and LCD module.
Check IC2 and X1.
No
Check D1, Q1, T1, Q3, Q4, Q21, Q22, IC10 and Q8.
Yes
Is time indicated on the LCD in an On-Hook
state?
state?
Is a dial tone sent from the handset when
Off-Hook?
Off-Hook?
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