Ghost - Samsung ML-4500/XEV Service Manual

Ghost

Is it regular
interval of 75.4mm?
YES
Transfer
NO
voltage is set to
standard?
YES
Check HVPS
contacts and
HVPS's self-output
-> If failed, repair/
replace HVPS
Bias voltage
is OK? (-350V)
YES
Operating/storage
temperature is too low or
not recommended
paper used?
YES
Use the machine with
recommended paper and
at condition
Samsung Electronics
Is it regular
NO
interval of 31.6mm?
YES
Developing
/suppying voltage
normal? (-350V/
-550V)
YES
Irregularity of NIP
between rollers in
developer
-> Replace developer
NO
Adjust the Bias
voltage or replace HVPS
There may be a problem in toner
NO
layer control in toner cartridge
-> Replace the developer
Is it regular
NO
interval of 47mm?
(as transfer roller
interval)
NO
Is it regular interval of
50.4 mm?
NO
YES
Clean heat roller
or replace it
- Repair or replace HVPS
- Check and Repair or
replace the terminal
contacts
Troubleshooting
Clean transfer roller's holder and
TR drive gearor replace TR holder ass'y
NO
Does
YES
the operation
of TR work properly?
YES
Clean TR drive
and OPC gear
Does the same
problem persist?
YES
A specific part of the transfer roller has
ruined or its resistance value is changed
-> Replace transfer roller
Transfer roller cannot force regularly due
to the gears eccentricity of transfer roller
-> Replace the defective component
NO
END
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