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Laserjet II "printer open" error code

We have a Laserjet II which we would like to maintain.

When turned on with no PC connected the lights come on the front panel and the display says the printer is doing a self check. After a few seconds the lights go out and the display reads "12 printer open". At no time can the fans or motors be heard. I tried opening the top, depressing the microswitch which is normally activated by the longish plastic tab on the cover, and powering on. I do not see a fuser lamp glow when I do this.

I took the DC Power supply (RGI-1394 (02)) apart and checked the microswitch. It's OK.

I do not have +24V between pins 1 and 14 on J212.

I do have 169V on the large electrolytic capacitor which must mean there is rectified mains voltage ready for use by the switchmode circuit.

This is as far as I wanted to go without a circuit diagram.

Can anyone suggest where I might find a service manual with schematics or just a DC power supply schematic?

John Knowles Montreal

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John Knowles
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Also: comp.sys.hp.hardware comp.periphs.printers

Jonesy

-- | Marvin L Jones | jonz | W3DHJ | linux | Gunnison, Colorado | @ | Jonesy | OS/2 __ | 7,703' -- 2,345m | config.com | DM68mn SK

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Allodoxaphobia

Reply to
John Knowles

I have a HP LaserJet II & a III. My II had the same symptoms you describe and the problem turned out to be a small electrolytic capacitor mounted on the print density card. This is the small card above the toner cartridge with the slide switch. I know this sounds strange but some of the interlock circuits feed through this card. In my case the capacitor was open and would not give any kick to my meter.

Van Gardner

Reply to
vangard

It's a II and not a IIP and now has a functioning 24V supply. I removed the PC board and found a crack in the board caused, I think, by rough handling. There were several broken traces which I repaired. All I need now is a new separator pad!

Thanks for reponding

the

microswitch

is

Reply to
John Knowles

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