Samsung SCX-4200 Series Service Manual page 104

Fault
Ghost & Image • The printed image
Contamination is too light or dark,
or partially
contaminated black.
• Totally
contaminated black.
(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.
(a) Check if foreign substance
or toner are stuck to the
terminals (point of contact)
of the toner cartridge or set.
(b) Check if the terminal
assembly is normal.
2. Totally contaminated black.
(Black image printed out)
(a) Check if foreign
substances are stuck to
the terminal (point of
contact) of the toner
cartridge or set.
(b) Check if the terminal
assembly is normal.
(Especially check the
charge roller terminal.)
3. The printed image is dark and
ghost occurs.
(a) Check if foreign
substances are stuck to
the terminal (point of
contact) of the toner
cartridge or set.
(b) Check if the terminal
assembly is normal.
(Especially check the
developer roller terminal.)
Troubleshooting
Solution
1. All of Items 1, 2, 3
(a) Clean the contacts on the
toner cartridge.
(b) Clean the contact points on
the set.
(c) If the terminal assembly is
damaged repair or replace
the terminals in the set or
replace the cartridge
2. In Item 2
This is particularly related to
problems with the charge roller
contact. Pay close attention to
the charge roller contacts.
3. In Item 3
This is particularly related to
problems with the developer
bias voltage contact. Pay close
attention to the charge roller
contacts.
Service Manual
6-23