Panasonic KX-FT21BX

-8-
(Model KX-FT21BX/KX-FT21BX-W)
KX-FT21BX/KX-FT21BX-W
(2)Troubleshooting flow chart
Is F101 open?
YES
Replace F101.
Is D101-D104 short?
YES
Replace D101-D104.
NO
NO
24V output OK?
24V output OK?
5V output OK?
Replace the broken part and IC101.
Replace D202.
NO
NO
YES
Are R107, R109
and D106 OK?
YES
YES
NO
NO
Are D-G, D-S, and
S-G (Q101) short?
Replace Q101 and R105.
Power ON
Power OFF
Power OFF
Power ON
Power OFF
YES
NO
(Control circuit check)
A
A
* When testing for a short
circuit, turn off first and then
turn on when you start to
check output voltage (24V or
5V) as illustrated in the flow
chart.
* An analog tester is
recommended to use for
checking a short circuit.