Lexmark 4039-1XX Manuale Utente

Diagnostic Information

Banding appears as light and dark horizontal lines on a page that is 
supposed to be uniformly gray. It is due to variation in the speed of 
the paper as it moves from roll to roll during development or transfer. 
It is undetectable when printing text and is most noticeable on fine 
dot or horizontal line patterns such as the second page of Print 
Test 2 or Print Test 3. Inspect the gear train and the paperfeed rollers 
for wear, damage, dirt, or binds. 

Areas that are supposed to stay blank are getting small amounts of 
toner deposited on them. Clean the erase lamps and the printhead 
window.

Run the diagnostic Paper Feed Test and verify that all the erase 
lamps turn on. If not, verify that there is +24VDC on pin (10R/12R/
12L/12C) J20-16 (16L) J17-16 (10P) J20-1 and between +15 and 
+20VDC on pin 15 (pin 2 on 10P). Shorting pin 15 (pin 2 on 10P) 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 in continuous mode and check the following 
voltages; then stop the test and check the voltages again:

Vertical Void or Streak

Vertical Service Check

Banding

Banding Service Check