9810 question and offer

[Katie Wasserman]

(02-15-2014 04:49 PM)dramsey Wrote:  Another question: As you can see, there are several printhead elements that fire all the time, leading to vertical lines in the output. I'm assuming this is an electronics issue rather than a physical printhead issue.

I have another 9810 I can use for board swaps. So: any hints on which boards I should swap?

There's just one PCB for printer control/print head driver. It's the one attached to the printer. IIRC you need to remove the printer and it's PCB as one unit. You might was well swap that whole assembly to verify that the problem is with electronics on the printer PCB. The head driver uses a bunch of 5 bit shift registers feeding high voltage buffer/drivers. On the schematic in the HP DVD set it shows these buffer/drivers as IC packages, but on Tony's schematic he shows them as discrete transistors. Possibly they made these PCB's two different ways.