Panasonic KX-FLB852CX Service Manual page 195

KX-FLB852CX / KX-FLB852CXS
6.6.20.3. BROKEN PARTS REPAIR DETAILS
(D10~D13)
Check for a short-circuit in terminal 4. If D10~D13 is short-circuit, F2 will melt (open).
In this case, replace all of the parts (D10 - D13, F2).
(Q1)
The worst case of Q1 is a short-circuit between the Drain and Gate because damage expands to the peripheral circuit of Q1.
This is due to a very high voltage through the Gate circuit which is composed of R7 and IC1. You should change all of the parts
listed as follows. F2, Q1, R7, IC1
(D101)
If D101 is broken, the oscillation circuit in the power supply cannot operate. Check it with an electric tester.
(F151)
If F151 is melted (open), check the 12 Voltage line of the Digital PCB and others.
(F301)
If F301 is melted (open), check the 3.3 Voltage line of the Digital PCB and others.
(F501)
If F501 is melted (open), check the 6 Voltage line of the Digital PCB and others.
195