FS-4200DN blank printing

[Kyo fan]

Hi everyone,

I'm running out of ideas on this one. It has about 80k prints and suddenly client calls that its printing blank pages. There is nothing strange in the event log, it's using oem toner and firmware is the latest. We took other working machine and so far tried with replacing 1 by 1: main pwb, engine pwb, high voltage pwb, laser unit and drum/developer assembly, and none of these helped. Sometimes we get very feint print on status page, mostly on the top of the page and thats it.

If anyone had something like this on these series (which btw will never reach quality of FS-4020 in any way), any tip would be much appreciated.

[blackcat4866]

Have you emergency stopped the machine to determine if you have a well developed image on the drum? =^..^=

[Kyo fan]

Just tried it, and i got nothing on the drum, hmm.

[blackcat4866]

Primary charge, Developing. or Developing bias. No errors? =^..^=

[Kyo fan]

Nope, no errors, few fxxx errors in the past on event log (most of them firmware solvable). Developing bias was the first thing i though and i've replaced high voltage pwb as first step. Managed to get most of the status page once after playing with 3 pin contacts below developer unit, just left of registration, but as you keep printing it disappears. My thoughts are the the contact is poor somewhere on the springs that connect to these pins and down below to high voltage pwb.

[blackcat4866]

Good luck.

[HenryT2]

Have you checked the incoming AC power ? Is it a good clean voltage above 110 ?
If so ; then ; just for the fun of it ..... Go into Command Center and do a RESET to factory default.
( I know you changed all PWB's , FW , etc. ; but this is a 4200 )
You will have to go back in after you power-cycle the printer , and set back to quick recovery and change the sleep timer to a realistic setting .

As BC said " GOOD LUCK "

[lees]

Have you looked at the developer drive? If the developer stops turning, you will get faded copies and then go blank.

[kma]

if the developer roller isn't turning change the dev clutch.

[Kyo fan]

It was the dev clutch after all, though it seemed ok when i started troubleshooting...

Thx all for suggestions.