Panasonic KX-FT25LA Service Manual ▷ View online
3. Broken parts repair details
(D101, D102, D103, D104)
Check for a short-circuit in terminal 4. If D101, D102, D103 and D104 are short-circuited, F101 will melt (open).
In this case, replace all of the parts (D101, D102, D103, D104, F101).
(Q101)
The worst case of Q101 is a short-circuit between the Drain and Gate because damage expands to the peripheral circuit of
Q101.
Q101.
This is due to a very high voltage through the Gate circuit which is composed of R105, Q102 and D107.
You should change all of the parts listed as follows.
F101, Q101, R105, Q102, D107
(D201)
If D201 is broken, the oscillation circuit in the power supply cannot operate. Check it with an electric tester.
(D204)
If D204 shorts, the voltage feedback circuit is almost always the cause.
Replace the following parts if this happens.
PC101, Q102, D203, D106, D105, D107
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2.3.4.6. Operation Board Section
1. No key operation
2. No LCD indication
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2.3.4.7. Sensor Section
Refer to 6.5. SENSORS AND SWITCHES for the circuit descriptions.
1. Check the document sensor (PS1)................."CHECK DOCUMENT"
2. Check the read position (PS2)................."REMOVE DOCUMENT"
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2.3.4.8. Read Section
Refer to 6.4.4. SCANNING BLOCK.
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