Panasonic KX-FT21BX Service Manual page 54

KX-FT21LA
3-5. ADF (Auto document feed) SECTION
(1) No document feed
When setting the document,
confirm a beep tone.
OK?
YES
Clean the separation roller.
(page 103)
Does the separation roller
rotate? [Use the motor test
function (page 88)]
YES
Adjust the separation spring
and clean or replace the pad.
YES
Replace the separation
roller unit.
YES
Replace the operating cover
unit.
To digital board
section. (page 59)
NO
Repair.
When using thin paper etc., if the document will not feed.
refer to the feed pressure adjustment (page 92).
NO
Check the separation
spring for distortion.
OK?
NG
NO Check the motor and
connector.
NO
OK?
NG
NO
OK?
NG
YES
Is the phase signal from
pins 126-130 of IC4 out-
put?
Is the solder at pins 126-
130 of IC4 OK?
YES
Replace IC8.
YES
END
OK Check the sensor
lever movement.
OK
Check the sensor
[Use the sensor check
function (page 88)]
and digital board.
(pages 59 and 79)
OK
END
OK?
Check the gear.
OK
END
OK?
OK
END
Is the voltage at emitter
of Q7 +24 V?
YES
YES
Is the voltage at collector
of Q7 +24 V?
NO
Is the voltage at pin 11 of
IC8 less than 2V?
YES
Replace Q7.
- 28 -
Replace the sen-
NG
sor lever.
NG
Replace the defec-
tive parts.
NG
Replace the motor
and connector.
YES
NG
Replace the gear.
YES
NO
Check the power supply
unit section. (page 74)
Replace IC8.
NO
OK?
YES
Replace the
NO
END
motor.
NO
OK?