Samsung ML-920 Service Manual page 78

Troubleshooting
Fault
Ghost & Image • The printed image is
Contamination too light or dark, or
partially contami-
nated black.
• Totally contaminat-
edblack.
(Black image
printed out)
4-41
Signs Cause & Check
1. The printed image is too light or
dark, or partially contaminated
black.
(1)Check whether foreign sub
stance or toner are stuck to the
terminal(point of contact) of
the developer.
(2)Check whether the terminal
assembly is normal.
2. Totally contaminated black.
(Black image printed out)
(1)Check whether foreign sub
stances are stuck to the termi-
nal(point of contact) of the
developer and the state of
assembly.
(Especially check the charged
roller terminal.)
Solution
1. All of 1, 2, 3 above
(1)Remove toner and foreign substances
adhered to the contact point of the
developer.
(2)The contact point of the unit facing that
of the developer also must be cleaned.
(3)If the terminal assembly is unsafe:
• Fully stick the terminal to or reassemble
it after disassembling.
• Disassemble the side plate and push
the terminal to be stuck, then reassem-
ble it.
2. In case of 2
It is a phenomenon when the OPC drum
of the developer is not electrically
charged. Clean the terminals of the
charged roller, then recheck it.
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