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Color laserjet 5500

we have a Color laserjet 5500. connected via a 615 network card. customer started getting this action... send the job ... the printer says its printing..... but nothing ever happens except the data light flashes. ok cancel job ...( it spools from the computer so its doesnt appear to be on the computer end ) .Change the network card to a known good. no difference. Event log yields a slew of 68 followed by 4 more hex digits.they are the last 6 entries. before that we see a ton of toner sensor errors 54.24... a couple of TOP OUTPUT BIN Paper late stop... errors...

ok so we start with the DC controller ... no change ... Actually here we start getting an error about the Magenta toner on the display... "need to order magenta cartridge" alternates now with Printing when you try to print.. ok replace the cartridge.... with another thats used but working in another printer just fine... no difference.. change the Toner sensor board ... no difference. Upgraded the firmware on the original formatter ... no change ... got a Brand new Magenta Toner for the machine ... now we start to print and get "printing".... then "Waiting for tray 2 to lift" alternating.....
this is getting altogether weird.
also with either DC controller ...No engine test print.
so we have... replaced the Dc controller now
changed the Formatter
replaced the NIC ( out of the picture altogether at this point)using the parallel port yielded no diff.
NEW firmware chip..
NEW Toner level sensor board....
did a COLD reset ..
NVRAM reset
through all this the printer now gets to calibrating then stops... open the door... to get the error about door open... then it goes Ready.
then the strange process starts over again.
im at a loss...

Joe