Troubleshooting Image Defects - Canon LBP-860 Service Manual

B. Troubleshooting Image Defects
jr-111
'rim paper
4
r?ansfer 5
:harging roller
High-vrrllagr 6
power supply
PCB (transrer
voltage)
DC cnntroller
PCB
Does the print quality improve when
the image density is adjusted?
the EP-E cartridge is replaced?
Open the printer while a print is being YES
made. and open the drum protective
shield of the EP-E cartridge. Is the
toner image on the drum being
transferred to the paper? [Do not open
the drum protective shield for more
than 10 seconds.)
Does the print quality improve when
new paper is used?
Does thr image become darker when
the transfer charging roller is
replaced?
Perform a test print. About two
seconds after the main motor starts.
does the voltage between J2 1 O-9
(X02) and 52 lo- 10 (GND) on the DC
controller PCB become about 0.76
VDC?
If the toner image is very
) faint, go to step 7.
Y E S Replace the ptint paper.
Advise the customer of the
proper method to store
paper.
YES Replace the roller.
YES Check the continuity
between the high-voltage
contact and the shaft of the
~
transfer charging roller. If it
IS within the proper valve,
replace the high-voltage
power supply PCB.
NO Replace the DC controller
PCB.
CHAF'TER 6
6-15