Panasonic KX-F680BX - Thermal Head Section

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KX-F680BX/KX-F2681BX
Is the voltage at pins
5,6 of CN301 23~24 V? (Power unit )
Is the voltage at pin 119
of IC1 4~5 V? (Digital
Board)
Is the voltage at pin 8 of CN251.
(Analog Board) 0~1 V? (When copying)
Is the amplitude at
pins 1, 4~7 of CN11
4~5 Vp-p?
Check switching power
supply section.
(Refer to page 76)
Check the solder at pin
119 of IC1 or pin 8 of
CN251.
Check R47, R48, R49,
C37, C38 and C39.
Replace the thermal
head.
Check IC1.
Check the voltage at pin
38 of IC1, 3 V (0 ) V 2V
(65 ) about 2.6V (25 ).
Take out CN11 and check the
amplitude again.
Take out CN11 and
check the amplitude
again.
Check the solde at pins
22, 25~28 of IC1 or re-
place IC1. (Digital Board)
Is the amplitude at pins
1~3 of CN11 4~5 Vp-p?
Check the cable of CN11
and CN301. (Power unit)
Check the solder at pins
23, 24 of IC1.
Replace thermal head.
YES
NO
NG
3-14. THERMAL HEAD SECTION
YES
YES
YES
YES
NO
NO
NO
NO
OK
OK
OK
OK
NG
NG