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Does the print qualtty improve when
Clean the printer drum grounding
Iigh-voltage
3
lower supply
'CB (Primary
ltgh voltage)
3c controller
PCB
contact and cartridge contact, then
perform one test print. Does the print
About one second after the main
motor starts. does the voltage between
5210.6 (HVRSV and 5210.10 (GND)
on the DC controller PCB change from
0 V to about 5 VDC'?
CHAPZ'ER 6
YES
Check whether the hlgh-
voltage contact is making
good contact with the
primary charging roller of
the cartridge. If it is, replace
lhe high-voltage power
supply PCB. If the problem
persists after replacing the
PCB. check by using the
'
laser malfunction diagnosis
flowchart in Section 111 C.
NO
Replace the DC controller
PCB. If the problem persists
1
after replaclng the PCB,
check by using the laser
malfunction diagnosis
flowchart in Section III C.
6-17
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