AL-840 (serv.man9). AL800 840 Service Manual-Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 20

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Problem
Cause
Remedy
Sample (Sample No.)
Black stain
Paper quality problem
Use paper which satisfies the printer
specifications.
A different printer’s developer
cartridge is installed.
Use the proper developer cartridge. If a
developer cartridge which was used in a
different printer, a trouble may occur.
Main charger voltage and
developing bias voltage
abnormality
Check the output voltage and replace the
defective parts. Adjust the output voltage.
Main charger and developing
bias output pin connection
failure
Check the contact section. Clean the
electrode.
Developer cartridge trouble,
dirt
Clean the developer cartridge. If the
abnormality continues, replace it.
Transfer charger roller
trouble (dirt, humidity)
Clean the roller. If the abnormality continues,
replace it.
Developing roller trouble (dirt,
humidity)
Clean the roller. If the abnormality continues,
replace it.
Chipped character
Too dry paper
Print with different paper.
Developer cartridge trouble
Clean or replace the developer cartridge.
Photoconductor cartridge
trouble
Clean or replace the photoconductor cartridge.
Transfer charger abnormality
Clean the transfer charger, If the abnormality
continues, replace it.
Transfer charger roller
trouble (dirt, abnormality)
Clean the roller. If the abnormality continues,
replace it.
Developing roller trouble (dirt,
humidity)
Clean the roller. If the abnormality continues,
replace it.
Scanner (reading) section dirt
Clean the scanner (reading) section.
Main charger, transfer
charger, developing bias
voltage abnormality
Check the output voltage and replace
defective parts.
Adjust the output voltage. 
Background dirt
Wet paper
Print with different paper. If a paper package
is opened unnecessarily, paper absorbs
humidity in the air.
Rough print surface
When printing on envelopes, change the print
layout. The overlapped section on the back
must be excluded from the print area.
Main charger, developing
bias voltage abnormality
Check the output voltage and replace
defective parts. Adjust the output voltage. 
Main charger, developing
bias output pin connection
failure
Check the contact and clean the electrode.
Developing cartridge trouble,
dirt
Clean the developer cartridge. If the
abnormality continues, replace it. 
Photoconductor cartridge
trouble
Replace the photoconductor cartridge.
Developing roller trouble (dirt,
humidity)
Clean the roller. If the abnormality continues,
replace it.
Scanner (reading) section dirt
Clean the scanner (reading) section.
Transfer charger roller
trouble (dirt)
Clean or replace the transfer charger roller.
Void area adjustment trouble
Adjust the void area.
Developer cartridge trouble
(dirt)
Clean or replace the developer cartridge. 
Fusing section trouble (dirt)
Clean or replace the fusing section.
Paper feed roller (dirt)
Clean or replace the paper feed roller.
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