Question about HP DeskJet 1220c InkJet Printer

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Some time ago my HP1220c popped and smoked. It was just sitting for a couple of years when I had a need once again for a large format printer. I repaired the power supply; replaced the 47mf 450v electrolytic, 2 MOSFET's and the 3.15 amp fuse. It bench tersted just fine. Upon reinstalling it in the printer and turning it on the PC recognized it but after only 10-20 seconds the Power supply blew again. Same components plus a resistor this time. It has been repaired once again and tested with the main board plugged into it. I suspect a motor - seems the most obvious component to pull a high enough load to burn the P/S. I have taken resistance readings of all 4 motors (that I can find) and none are shorted. The current ratings are on the P/S but I don't know the operating voltage of the motors. I suspect its 18v and if so the current shouldn't exceed the capacity of the P/S, which is 2.2 amps. Unless both the carriage motor and the paper drive motors operate simutaneously, which I think they do. The small motor that moves the ink dock forward and back has a pretty goo cover of ink on it, but it doesn't appear to be shorted. Am I going down the right path? Or is there something obvious I'm missing. The MOSFET's were hard to get - they had to come from China. By the way, I'm in the Philippines. Any suggestions are appreciated.

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  • brooksweiss Jun 28, 2009

    Hi John Ray,
    I know I could buy a new printer for $300, but that's a lot when you're retired and maybe you could fix the one you've got. Labor here in the Philippines is cheap (we have nothing but time on our hands). Thanks for the post. I'm still hoping I can fix this puppy.


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With the electronics experience you have, changing of Cap and MOSFIT's, I must ask this question... Why, do you not have real projects to get into ??
If you have powered up the unit without the drain of the motors and after connecting the 4-motors and others you still pull to much current, I would continue tracing backwards.
I would check the rating of the FET"s and if you have to replace them anyway, Go larger, I wonder if the caps also took a dive. You ordered your FET's in a pair and not just replacing one at a time ? Sorry, just had to ask.. You got too much experience for this, Your like me, can't trash anything with a major attempt.
Have Fun
John Ray
john@johnrraycomputer.com

Posted on Jun 28, 2009

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