Horizontal Band - Samsung ML-920 Service Manual

Horizontal Band

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Black band?
YES
The black
band has regular
interval?
YES
94mm interval?
YES
The OPC is damaged due to
the irregular transfer voltage
of HVPS
-> Repair/replace HVPS
-> If the same problem persists,
replace the developer
Samsung Electronics
Black band
NO
is far about 95mm from
white band?
Problem of internal
contacts in OPC
-> Replace developer
This occurs when no
NO
Hsync/ at LSU
-> Replace LSU
Does it appear
NO
at every 83mm at
specific place?
YES
Heat roller is ruined
-> Replace the roller
The OPC is damaged under the
NO
direct sunlight for around 5
minutes -> If the same problem
persists in 10 hours, replace
the developer
Problems of terminal contact,
transfer voltage supplying,
NO
and transfer roller's due to the
charge roller is ruined (38mm)
-> Repair/replace HVPS,
developer
Troubleshooting
4-26