Printer help?

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Thu Sep 9 14:13:09 2004

>From: "der Mouse" <mouse_at_rodents.montreal.qc.ca>
>
>>> I would guess that replacing the cap should put it back in working
>>> order.
>> I've now removed the cap. [...]
>
>Duh, I forgot to say: I've more than removed the dead cap.
>
>The bottom of the cap is visibly damaged; it has lost a good deal of
>some black material. The baord is also visibly damaged; the
>component-side etch under the capacitor has lost its coating, and the
>board is significantly pitted, too.
>
>I replaced it with a 220/35 cap from my parts drawer; when I put the
>result in place, turning it on produced another flash of light from
>that area. I removed it again and cleaned the area with water and an
>old toothbrush and let it dry overnight.
>
>Now, the power supply no longer does the tick-tick-tick overload thing;
>it comes on and stays on. But it doesn't work; I get the usual walking
>lights, then the 05 SELF TEST display, then SWITCHING TO PS; after a
>bit, it changes to 55 SERVICE. This may be because I still have all
>the covers off - there may be sensor switches - or it may be because
>the pc board damage has broken a critical etch run or something. I do
>note a very faint ticking noise, disturbingly reminiscent of the one I
>mentioned before - but far less frequent (maybe every five seconds) and
>a great deal softer; I had to listen closely to be sure I wasn't
>imagining it.
>
>I think one of you said something about having a service manual; does
>it happen to say what 55 SERVICE means?

Hi
 I think most of the error messages are listed but sometime it
just says something like "replace the xxx board under the main board".
If you know what I mean. Look at the board carfully. It sounds like
you had a small electrical fire. Remove any charred PC board and
look to see if traces are burnt through. Missing solder mask is not
an issue but missing copper is.
 I'll look for my manual to see what it says( not here so will
report back tomorrow ).
 This sounds like a PS board. Not having the drawings here, this
might be the case. If so, the diode or diode bridge may shorted.
This would wipe out the cap and maybe a few more parts.
Dwight

>
>Failing that, does anyone happen to have a spare board? It's the
>smaller of the two digital logic boards - the one that measures
>something like 6 by 8 inches, the one you have to remove the big one to
>get at. (I don't _like_ boardswapping, but absent the tools and doc
>I'd need to diagnose this one, I see little alternative.)
>
>/~\ The ASCII der Mouse
>\ / Ribbon Campaign
> X Against HTML mouse_at_rodents.montreal.qc.ca
>/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
>
Received on Thu Sep 09 2004 - 14:13:09 BST