Panasonic KX-FT21BX

TROUBLESHOOTING GUIDE
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KX-FT21LA
(2) Troubleshooting flow chart
Our recommendation for troubleshooting is as follows.
This procedure comes from our experience of troubleshooting in our lab.
* Before turning on the power supply, you should check F101.
ls F101 open?
YES
Replace F101.
D101-D104 is short.
YES
Replace D101-D104.
NO
NO
24V output OK?
24V output OK?
5V output OK?
Replace the broken part.
Replace IC202.
NO
NO
YES
Does D105, D106, D107,
PC101 or Q102 short?
YES
YES
NO
NO
D-G, D-S,
S-G (Q101) short?
Replace Q101.
YES
NO
(Control circuit check)
A
A