2 Apr
2019
2 Apr
'19
6:48 p.m.
On 04/02/2019 02:56 PM, Ali via cctalk wrote:
I rescued a LaserJet 4+ printer that I have been
trying to restore.
Initially everything seemed ok and it seemed as if there may be just a bit
of an issue with paper pickup which I attributed to old paper in the tray.
However, soon I started getting the accordion paper jam which led me to
replacing all the rollers including the transfer roller. Now the paper flows
freely! However, I am having a new problem with printing. When I print, the
first 5-10 pages initially come out blank. The printer does not produce any
errors or error codes. The blank pages are warm (not hot though) as expected
out of a LJ.
After closer inspection it seems that the pages are printed SUPER light and
gradually get darker the more I use the printer continuously. Eventually the
printer starts printing continuous crisp black pages like new. This is a
whole page phenomenon (i.e. not gaps, missing areas, etc.).
Is the fuser roller warming up properly? Or, is it the
corona supply is having trouble coming up to voltage? You
should pull the bottom of the printer apart and thoroughly
clean the PC board on both sides. If you have never done
this, it will be a HUGE BLACK MESS with spilled toner dust -
don't ask how I know this!
I have a 5M, but I think the mechanism is the same.
Jon