Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!wuarchive!udel!mmdf
From: kes%saturn.ACC.COM@salt.acc.com (Kevin Stocksdale)
Newsgroups: comp.sys.amiga
Subject: A500 hardware problem
Message-ID: <7057@nigel.udel.EDU>
Date: 29 Dec 89 15:39:24 GMT
Sender: mmdf@udel.EDU
Lines: 30

I have a stock A500 (with an 2002 monitor bought Nov. 1987).
Every couple of months a problem arises which can be fixed by
re-seating various chips.

When I turn the power on I hear the floppy drive click
every couple seconds (to determine if a disk is present).
The screen which prompts the user to insert the disk

 a.) does not appear.
 b.) takes a long time to appear.
 c.) sometimes appears with corrupted color and vertical lines.

When the screen does not appear the machine fails to recognize
when I insert a disk.  And on occasion the red power LED will
flash 11 times then it seems that the CPU gets reset and the
process repeats itself (no disk click when this happens).

Because of the frequency of occurence it would not be economical
to send it out for repair.  Besides, I can resolve the problem
by pressing on a few chips.

Does the 11 flashes of the power LED signify something (diagnostic
code)? Does anyone have any suggestions as to which chip may need
replacing?

================================================================
Kevin Stocksdale		Advanced Computer Communications
kes@saturn.acc.com		10220 Old Columbia Rd.
301-290-8100			Columbia Md. 21046
================================================================