Samsung ML-3471ND/XAX Service Manual page 131

Fault
Ghost & Image • The printed image
Contamination is too light or dark,
or partially
contaminated black.
• Totally
contaminatedblack.
(Black image
printed out)
• The density of
printouts is too dark
and ghost occurs.
Samsung Electronics
Signs Cause & Check
1. The printed image is too light
or dark, or partially
contaminated black.
(1)Check whether foreign
substance or toner are stuck
to the terminal(point of
contact) of the toner
cartridge.
(2)Check whether the terminal
assembly is normal.
2. Totally contaminated black.
(Black image printed out)
(1)Check whether foreign
substances are stuck to the
terminal(point of contact) of
the toner cartridge and the
state of assembly.
(Especially check the
charged roller terminal.)
3. The printed image is dark and
ghost occurs.
(1)Check foreign substance
attached to the terminal
(point of contact) of the toner
cartridge and the state of
assembly.
(Especially check the
developing roller terminal.)
Adjustment and Troubleshooting
Solution
1. All of 1, 2, 3 above
(1)Remove toner and foreign
substances adhered to the
contact point of the toner
cartridge.
(2)The contact point of the unit
facing that of the toner
cartridge also must be
cleaned.
(3)If the terminal assembly is
unsafe:
• Fully stick the terminal to or
reassemble it
disassembling.
• Disassemble the side plate and
push the terminal to be stuck,
then reassemble it.
2. In case of 2
It is a phenomenon when the
OPC drum of the toner cartridge
is not electrically charged. Clean
the terminals of the charged
roller, then recheck it.
3. In case of 3
It is a phenomenon as the
developing bias voltage of the
toner cartridge. Clean the
terminals of the developing roller,
then recheck it.
Service Manual
after
4-63