HP FAX-750 Service Manual - Page 165

COPY nor FAX: NO. &amp, Sensor Operational Check.

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[ 3 ] Communications related Trouble (1) No tone is transmitted. • Main PCB • NCU PCB Check: [ 4 ] Paper/document feeding related Trouble (1) Neither "COPY: PRESS COPY" nor "FAX: NO. & START" message appears although documents are set. (2) Document not fed. (3) Recording paper not fed. (4) Document double feeding Check: • Sensors by using the maintenance-mode function code 32. (Refer to Chapter V, Section 3.8, "Sensor Operational Check".) • Document front sensor actuator and rear sensor actuator • Main PCB • ADF and its related sections • Drive motor and its harness • LF roller and its related gears • Solenoid and the planetary gear train • Main PCB • Paper feed roller and its related sections • Drive motor and its harness • Platen and its related gears • Solenoid and the planetary gear train • Main PCB • ADF parts VI - 14

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VI
- 14
[ 3 ]
Communications related
Trouble
Check:
(1)
No tone is transmitted.
•
Main PCB
•
NCU PCB
[ 4 ]
Paper/document feeding related
Trouble
Check:
(1)
Neither "COPY: PRESS
COPY" nor "FAX: NO. &
START" message appears
although documents are set.
•
Sensors by using the maintenance-mode function code 32.
(Refer to Chapter
V
, Section 3.8, "Sensor Operational Check".)
•
Document front sensor actuator and rear sensor actuator
•
Main PCB
(2)
Document not fed.
•
ADF and its related sections
•
Drive motor and its harness
•
LF roller and its related gears
•
Solenoid and the planetary gear train
•
Main PCB
(3)
Recording paper not fed.
•
Paper feed roller and its related sections
•
Drive motor and its harness
•
Platen and its related gears
•
Solenoid and the planetary gear train
•
Main PCB
(4)
Document double feeding
•
ADF parts