Sharp SF-1014 Service Manual page 93

Error code
Item
Main Sub
L4 1 Detail
Cause
Remedy
L5 2 Content
Detail
Cause
Remedy
L8 1 Content
Detail
Cause
Remedy
3 Content
Detail
Cause
The rotary encoder signal cannot be detected for more than 50ms during delivery of the
main motor On signal output.
1) Main moor trouble
2) Main control circuit trouble
3) Main motor rotation sensor and its input circuit (main control circuit) trouble
4) Main motor drive mechanism trouble
5) An overload on the main motor drive section
Check the following items:
A. Check the main motor control circuit and its peripheral sections.
1) Main motor drive signal is inputted.
2) The main motor rotation sensor signal is inputted to the control circuit.
B. Check the main motor drive mechanism.
1) Drive wire
2) Pulley
3) Gear
After repair, turn off/on the power switch.
Lens drive motor trouble
1) During the initial operation, the lens does not move from the reduction copy position to
the enlarged copy position. Or the lens home position sensor (LHPS) does not turn on
even though the lens moves (130mm/lens motor drive pulse output).
2) During the initial operation, the lens does not move to the enlargement copy position.
Or the lens moves (70mm/ 50 pulses of lens motor drive pulse are outputted) but the
lens home position sensor (LHPS) does not turn off.
3) When the lens moves from the reduction coy position to the enlargement copy position,
the specified number of pulses required for the lens home position sensor (LHPS) to
move from ON position to OFF position is shifted by 20 pulses (4mm) or more.
4) AT the completion of lens movement, the lens home position sensor is not ON when in
enlargement copying, or not OFF when in reduction copying.
1) Lens motor trouble
2) Main control circuit trouble
3) Lens motor rotation sensor and its input circuit (main control PWB) trouble
4) Lens motor drive mechanism trouble
5) An overload on lens motor drive mechanism
Use simulations 1-3 or 1-4 to check the following items:
A. Check the lens motor control circuit and its peripheral sections.
1) The lens motor drive signal is outputted.
2) Lens motor rotation sensor signal is inputted to the control circuit.
B. Check the lens motor drive mechanism.
1) Drive wire
2) Pulley
3) Gear
After repair, turn off/on the power switch.
Power frequency abnormality
The power frequency is shifted from the specified level by 5% or more for 10 cycles or
more, or the FW signal cannot be detected for more than 5 sec.
1) FW is not outputted or the output waveform is abnormal.
2) Power circuit trouble (AC power unit/DC power unit)
3) FW input circuit trouble (main control circuit)
4) AC power trouble (waveform/voltage)
Check the waveforms of the following units with an oscilloscope.
1) FW signal waveform in the DC power unit
2) FW signal waveform in the main control circuit
3) AC power line
After repair, turn OFF/ON the power switch.
During execution of simulation 47, the AE sensor output does not change according to
change in the copy lamp voltage.
AE sensor trouble
1) AE sensor or its input circuit (main control PWB) trouble
2) Copy lamp control circuit trouble (copy lamp control signal abnormality)
3) A white paper is not set on the document table or the document table or the document
cover is dirty.
Description
9 – 3
Ref. page
8-10
8-11
8-5