Light Image - Samsung SCX-4200 Series Service Manual

6.1.5 Light Image

• Description The printed image is light, with no ghost.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
6.1.6 Dark Image or a Black
• Description The printed image is dark.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Samsung Electronics
Check and Cause
1. Toner Save mode enabled
2. Develop roller is contaminated or the
toner cartridge is almost empty.
3. Ambient temperature is below than 10°C.
4. Bad contact caused by dirty terminals on
the toner cartridge or set.
5. Abnormal output from the HVPS.
(Run EDC mode – see sections 6.1.2
and 6.1.3)
Check and Cause
1. No charge voltage in the engine board.
2. Charge voltage fault due to bad contact
between toner cartridge and set contacts.
3. VD0 signal of the Main PBA is Low state.
Solution
1. Ensure the Toner Save mode is off. Check
set and driver settings.
2. Replace the toner cartridge and try to print
out again.
3. Wait 30 minutes after printer is powered on
before you start printing.
4. Clean the cartridge and set contacts.
Generally clean dirt from inside the set.
5. Replace the HVPS if the problems are not
solved by the above four instructions.
Solution
1. Check the state of the connector which
connects the engine board and HVPS.
2. Clean the high voltage charge terminals.
Note if 1 and 2 do not resolve the problem
and the problem persists replace the
HVPS.
3. Replace the LSU Unit or Main PBA.
Troubleshooting
Service Manual
6-3