KX-FT21LA
- 82 -
During copying, are pins 1 to 3 of Q13
on the digital board at 23 to 25V ?
Is pin 1 of CN1 on the digital
board at 23 to 25V?
Check the
power supply.
During copying, is the base of Q8 on the
digital board at 4 to 5V ?
Check pin 170 of IC1 on the
digital board.
Make the necessary repairs.
During copying, is pin 5 of Q13 on the
digital board at 23 to 25V ?
Check the route between
pin 1 of CN1 and pin 1
of Q13 on the
digital board.
Check the voltage at
pin 207 of IC4 on the
digital board.
(See page 119.)
Check the solder points of pin 159,
160, 163, 166, 167 of IC1 on the
digital board.
Make the necessary repairs.
YES
NO NG
OK
NO
3-13. THERMAL HEAD SECTION (Refer to page 122 for circuit operation)
YES YES
Check the waveform of CN4 on the
digital board.
(See page 123.)
YES
OK
NO
NO
Replace Q13.
NG
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