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Article View: comp.sys.amiga.tech
Article #2987

8520 repairs, part numbers, advice

#2987
From: Phil Stone
Date: Sun, 18 Mar 1990 20:58
29 lines
1456 bytes
I have had continuing problems with the FIRE pin
on the second joystick port (it seems to have blown
out from a powered-on connection, or static or
something).  I have tried swapping in new 8520's,
but the problem remains the same.  The Amiga always
thinks that the FIR1 pin (9) on the 8520 (U300)
is active.

Through the schematic, I traced the problem to 
capacitor C250.  Sure enough, an ohmmeter showed
there to be a short across this capacitor, which
caused the corresponding asserted (low) condition.

Main Question:

Does anybody know the part number for this cap (C250)?
The schematic lists it as 100 pF, but I don't
recognize the style (see-through, with copper-colored
bands at the ends).  Who sells this part?

Any caveats for replacing the cap?  I'm going to remove
the associated 8520 while I do the cutting and soldering.
I think the new cap can be soldered in from the top of
the motherboard.

Thanks for any info or tips you can give me.

		Phil Stone	 (phil@eos.arc.nasa.gov | ames!eos!phil)
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From: phil@eos.UUCP (Phil Stone)
Newsgroups: comp.sys.amiga.tech
Subject: 8520 repairs, part numbers, advice
Message-ID: <6508@eos.UUCP>
Date: 18 Mar 90 20:58:46 GMT
Reply-To: phil@eos.arc.nasa.gov (Phil Stone)
Organization: NASA Ames Research Center, Calif.
Lines: 29