AL-840 (serv.man9). AL800 840 Service Manual-Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 23

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Problem
Cause
Remedy
Sample (Sample No.)
Black streaks (Vertical to
paper transport direction)
Developer cartridge trouble
Replace the developer cartridge.
Photoconductor cartridge
trouble
Replace the photoconductor cartridge. 
Laser unit trouble
Replace the upper frame unit.
Control PWB trouble
Repair the control PWB.
Transfer charger roller
trouble (dirt, moisture)
Clean the roller. If the abnormality continues,
replace it. 
Developing roller trouble (dirt,
moisture)
Clean the roller. If the abnormality continues,
replace it.
Laser unit trouble
Replace the upper frame unit. 
Scanner (writing) section dirt
Clean the scanner (writing) section.
White streaks (Vertical to
paper transport direction)
Developer cartridge trouble
Replace the developer cartridge.
Photoconductor cartridge
trouble
Replace the photoconductor cartridge.
Laser unit trouble
Replace the upper frame unit.
Control PWB trouble
Repair the control PWB.
Transfer charger roller
trouble (dirt, moisture)
Clean the roller. If the abnormality continues,
replace it.
Developing roller trouble (dirt,
moisture)
Clean the roller. If the abnormality continues,
replace it.
Scanner (writing) section dirt
Clean the scanner (writing) section dirt
Scanner (reading) section dirt
Clean the scanner (reading) section dirt
Fusing trouble
Abnormally low fusing
temperature
Check the temperature sensor and its
peripheral circuit. replace the thermistor.
Replace the heater lamp. Check the heater
drive circuit.
SMP4
Abnormally high fusing
temperature
Clean the fusing section. 
Heat roller, pressure roller
trouble
Replace the heat roller/pressure roller.
SMP1
10 – 23

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