Panasonic KX-F1200 Service Manual And Technical Manual page 55

Note/) Gheck the thermal head
KX-Fi200
Is the voltage at pin 10 of CN4 (Analog
Board) 0 V? (When copying)
YES
NO
L
Is the voltage at pins
1,2 of CN301 23-24 V? (Power unit)
YES
is the amplitude at pins
1,4~7 of CN407
4~5 Vp-p?
NO
J YES
/
Isthe amplitude at pins l--
2, 3 of CN407 4~5 Vp-p?
YES
NO
I
Check the pin 8 of I
CN407
25°C = 2.8V NO
40°C = 2.1V
80°C = 0.7V
J YES
Check the cable of
CN407 and CN301.
OK
OK
1
/
Replace thermal head. /
J
NO
Is the voltage at pin 6
of IC401 4-5 V?
YES
I heck switching power
supply section.
(Refer to page 63.)
Take out CN407 and check the
amplitude again.
Check the solder at pin
6 of IC401 and Q407.
NG
Z)K
Check the solder at pins
29-32 of IC404 and pin
34 of IC417.
NG
Replace IC404 or
IC417.
OK
I
Check the solder R420 R421 C405
R422, C406, C407 and pin 2 of IC404.
I Take out CN407 and t_N__G
" check the amplitude
again.
I
Check the solder at pin
35 of IC417 and pin 34
of IC404.
Replace IC401.
]
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