Ghost - Samsung ML-920 Service Manual

Ghost

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
NO
Replace PTL
assembly
Check HVPS
contacts and
HVPS's self-
NO
output
-> If failed,
repair/replace
HVPS
Samsung Electronics
Is it regular NO
interval of 95mm?
YES
PTL lamp
works OK?
YES
Transfer
voltage is set to
standard?
YES
Bias voltage NO
is OK? (-300V)
YES
NO
Operating/storage
temperature is too low or
not recommended
paper used?
YES
Use the machine with
recommended paper and
at condition
Is it regular
NO
interval of 45mm?
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
Developing
NO
/supplying voltage
normal? (-300V/
-500V)
YES
Irregularity of NIP
between rollers in
developer
-> Replace developer
Adjust the Bias
voltage or replace
HVPS
There may be a problem in toner
layer control in toner cartridge
-> Replace the developer
Troubleshooting
Is it regular
interval of 58mm?
(as transfer roller
interval)
YES
- Repair or replace HVPS
- Check and Repair or
replace the terminal
contacts
4-24