Samsung SF-530 Service Manual page 54

Horizontal Band
Black band?
YES
The black
band has regular
interval?
YES
75.4 mm 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 10mm 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 56.1mm at
specific place?
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 (37.7mm)
-> Repair/replace HVPS,
YES
Troubleshooting
developer
4-21