Sharp SF-2014 Service Manual page 103

4. Self diag contents
Error code
Item
Main Sub
L1 0 Content
Detail
Cause
Remedy
L3 0 Content
Detail
Cause
Remedy
L4 1 Content
Scanner feed trouble
1) 86 pulses (45 mm) of the scanner motor drive pulse have been outputted after the
scanner unit started scanning, but the scanner home position sensor (MHPS) does not
turn off.
2) The scanner unit is not at its home position (MHPS does not turn on) when the scanner
unit starts scanning.
3) The scanner home position sensor (MHPS) does not turn on when the scanner
performs the initial operation.
1) Scanner motor trouble
2) Scanner motor control circuit trouble
3) Scanner motor rotation sensor and its control circuit trouble
4) Scanner home position sensor (MHPS)and its input circuit trouble (main control circuit
trouble)
5) Scanner unit drive mechanism trouble
6) An overload to the drive section
Use simulations 1-1 and 1-2 to check the following:
A. Check the mirror motor control circuit and its peripheral sections.
1) The scanner unit operates normally.
2) The scanner home position sensor ((MHPS) operates normally and its output signal is
inputted to the main control PWB.
3) The scanner motor drive signal is outputted.
4) The scanner motor rotation sensor signal is inputted to the control circuit.
B. Check the scanner unit drive mechanism.
1) Drive wire
2) Pulley
3) Gear
After repair, turn off/on the power switch.
Scanner return trouble
1) The scanner motor drive pulses required for the scanner unit to return are shifted more
than 50 pulses for the drive pulses required for feeding. (The corresponding distance is
10mm or more.)
2) The scanner motor drive pulses required for the scanner unit to return are within 50
pulses for the drive pulses required to feed.
3) The scanner unit does not return. Or through it returns, the scanner unit does not
return to its home position (the MHPS does not turn on).
(Though the scanner motor drive pulses required to return are 50 pulses greater than
the drive pulses required for the scanner unit to feed, the scanner unit is not in the
home position (the MHPS does not turn on).
4) After the scanner unit returns, the MHPS does not turn on.
1) Scanner motor trouble
2) Scanner motor control circuit trouble
3) Scanner motor rotation sensor and its peripheral sections trouble
4) Scanner home position sensor (MHPS) and its input circuit trouble
5) Scanner unit drive mechanism trouble
6) Overload at the scanner motor drive section
Use simulation 1-1 and 1-2 to check the following:
A. Check the mirror motor control circuit and its peripheral.
1) The scanner unit operates normally.
2) The scanner home position sensor (MHPS) operates normally and its output signal is
inputted to the main control circuit.
3) The scanner motor drive signal is inputted.
4) The scanner motor rotation sensor signal is inputted to the control circuit.
B. Check the scanner unit drive mechanism.
1) Drive wire
2) Pulley
3) Gear
After repair, turn off/on the power switch.
Main motor lock trouble
Description
9 – 2
Ref. page
8-10
8-10