Lexmark Optra 4049 Series, Service Manual

Page: 40 / 194

2-13
4049-XXX
J9-1 and b15 and +20VDC on engine board J9-2. Shorting
engine board J9-2 to ground should turn on all the erase lamps.
Check the erase lamp cable continuity. Replace the transfer roll
housing if the voltage and the cable are good.
Inspect the contacts on the HVPS; make sure each spring-loaded
contact returns when pressed and released.
Rough Paper mode can cause background on some papers; if
Rough Paper mode is on, turn it off and run the print test again.
Printing on coated paper or using refilled print cartridges can also
cause background.
Run the Print Test with the RIP Board removed and check the follow-
ing voltages; then stop the test and check the voltages again:
If any voltages are not correct replace the engine board.
If no problem is found, enter the diagnostics mode and change the
Charge Roll setting.
Users who run large jobs with very dense graphics in high humidity
environments may get some print quality improvement from increas-
ing the Transfer setting; users with more normal jobs will see no dif-
ference.
Make sure the HVPS contacts to the transfer roll housing are in good
condition.
Black Page
Black output is usually caused by an incorrect high voltage in the
printing process, resulting in toner development on the entire photo-
Connector
Voltage while
Printing
Voltage while Idling
J13-1 Less than 5 VDC 0 VDC
J13-2 Less than 5 VDC 0 VDC
J13-3 (Fluctuates
between pages)
+1.5 VDC 0 VDC
J13-8 Less than 1 VDC +6 VDC