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"random dumb stuff" now i feel like you are my head to head competitor i felt like i had a niche

i have a good friend who owns a bunch of radio stations & a video production company when he bought the first station,, he used to call me and we spent HOURS on the phone talking him through computer problems (like i had done with his video equipment) i finally wised up and bought a gralab timer...

i've done this for 40 or 50 years. (fixing this type of equipment as well as many others) there was a woman who joined signs101 around 5 years ago. she ran a department for a large school system and felt she could buy a decent used printer and move much of her production in house. i remember...

we are all surprised that our printers are more complicated than, say, a toaster...

shake cartridges before we begin an engineering project

air bubbles in line? it couldn't hurt to take a syringe and pull some ink through the appropriate (missing) color(s) since it started out printing ok

jburton have you ever been in witness protection?

so would i

you have me curious now. i will have to watch a couple videos i was fixing printers since the techjet 720 and the hp laserjet 1's

unless you flush THOROUGHLY you will be turning the printer into garbage. (or at least guaranteeing you need new heads WHY NOT configure remote access & send a color wheel every other day. i really didn't print anything but daily color wheels on my printers after the wife ended up in hospital...

on these boards, don't you have to match firmware? that can be torture

yes, the fact that the green led lights does not mean it is a good board.

probably the way to go. i would trust your assessment. i have bought many bad boards on ebay, especially ones that are not easy to test

i realize this is not a good place for you to order, but, gives you an idea of what the price is less than the price of 2 ink cartridges...

My best suggestion would be, if nothing lights, buy a replacement power supply. even those of us who are qualified tondo that type of repair rarely have success. the service manual ASSUMES troubleshooting end with replacement of a circuit board. hp has the circuit drawings for board level repair...

I will have time later to review the manual a bit, but, this will not be a change the fuse situation. my guess would be you wil” end up replacing the power supply. before you do, it would be worth taking the power supply out of the machine &removing the covers. you will most likely find the...

It appears there are 2 sets of status lights that indicate the condition of power supply and the state of system board. Should get you pretty far into the process

you could try shaking them once in a while

https://www.laserexpressinc.com/manuals/HP/hp-dsj-t790-t1300-z5400-t2300-service-manual.pdf

i guess that's why the typical service manual is 500 pages long... i just printed the manual for my designjet (t1700dr) 550 pages