AL-840 (serv.man9). AL800 840 Service Manual-Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 22

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Problem
Cause
Remedy
Sample (Sample No.)
Ghost
Transfer roller trouble
Clean or replace the transfer charger roller. 
SMP5
Transfer charger voltage
trouble
Repair or replace the high voltage power
PWB.
Photoconductor cartridge
trouble
Replace the photoconductor cartridge.
Distorted image print
Paper feed roller trouble
Clean or replace the paper feed roller.
SMP6
Separation sheet trouble
Clean or replace the separation sheet. 
Scanner (reading) section
trouble
Adjust the installing positions of parts.
Scanner (writing) section
trouble
Replace the scanner (writing) unit.
Transfer charger roller trouble
Clean or replace the transfer charger roller.
Black print
Main charger voltage trouble
Repair or replace the high voltage power
PWB.
SMP7
Main charger electrode
contact failure
Clean the main charger electrode. 
Copy lamp trouble
Replace the copy lamp.
Copy lamp control PWB
trouble
Replace the copy lamp control PWB.
CCD unit trouble
Replace the CCD unit.
White print
Transfer charger voltage
trouble
Repair or replace the high voltage power
PWB.
Transfer charger electrode
contact failure
Clean the transfer charger electrode. 
Developing bias voltage
trouble
Repair or replace the high voltage power
PWB.
Developing bias electrode
contact failure
Clean the developing bias electrode. 
Scanner (writing) section
trouble
Replace the scanner (writing) section.
CCD unit trouble
Replace the CCD unit.
Banding
Developer cartridge trouble
Replace the developer cartridge. 
SMP8
Photoconductor cartridge
trouble
Replace the photoconductor cartridge.
Scanner (writing) section
drive trouble
Adjust the installing position of the scanner
(writing) section drive part or replace it.
Scanner (writing) section
trouble
Replace the scanner (writing) section.
Drive section trouble
Adjust the installing position of the drive part
or replace it. 
Uneven density
Scanner (reading) section dirt
Clean the scanner (reading) section. 
SMP9
Scanner (writing) section dirt
Clean the scanner (writing) section.
Transfer charger voltage
trouble
Repair or replace the high voltage power
PWB.
Transfer charger electrode
contact failure
Clean the transfer charger electrode.
Developing bias voltage
trouble
Repair or replace the high voltage power
PWB.
Developing bias electrode
contact failure
Clean the developing bias electrode.
Main charger voltage trouble
Repair or replace the high voltage power
PWB.
Main charger electrode
contact failure
Clean the main charger electrode.
Developer cartridge trouble
Replace the developer cartridge.
Photoconductor cartridge
trouble
Replace the photoconductor cartridge. 
Streaks, black points or white
points in 78mm pitch
Photoconductor cartridge
trouble (dirt)
Clean or replace the developer cartridge. 
SMP10
Streaks, black points or white
points in 45mm pitch
Fusing section trouble
Clean or replace the fusing section. 
SMP11
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