HP9810A Printer

[aj04062]

Thanks Paul,

I changed out the print head board on the printer that was not advancing. That fixed it. So something is off with that board. I made a note on it, but probably will not address it as I have a parts 9820A I pulled from.

I have another issue I'm trying to debug. The machine had a cup of coffee or something spilled into it right where the pacs go years ago. I couldn't get one module out, so I disassembled and once apart, I could get it disconnected. I've washed the board down, dried it (canned air, hairdryer and time) and re-assembled. I've got the machine 100% working (printer, card reader) so I wanted to let it sit and run for a while to make sure nothing acted up.

Well, with this module board plugged into the back plane, after 10-20 minutes, the display starts to flicker random numbers and the machine becomes unresponsive. If it is shut off and turned back on, the display does not come back. If I unplug this module/daughter board it seems to be fine and stable. There are NO components on this board. It is just connectors and a PCB.

Could there still be gunk on the board creating an artifact that corrupts the memory? It looks clean, but I cannot see under the card connectors.

EDIT:
Perhaps there was a bit of moisture still there as I have re-assembled and it seems to be fine....Or perhaps a flaky connection that improved after taking apart 3-4 times!