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From: FINEBERG@WUMS2.WUSTL.EDU (Charlie Fineberg)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: More on my sick 2500/30
Message-ID: <9106040619.AA27553@wugate.wustl.edu>
Date: 4 Jun 91 06:19:53 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 45

Yet another update on my still sick 2500/30...
  Mark Gooderum (he just moved so I don't have a valid address) and 
dvlrab@cs.umu.se (Roger Abrahamsson) both suggested that the CIAs caused a
similar problem on their machines.  So I swapped them and no go.  Exact
same symptoms.  And this is not an occasional hang with no response it is
getting stuck on the (I think, now that I have stared at a vanilla 2000's
startup sequence for a while) the white screen that I am stuck on.  It
seems actually to get through an initial flicker and then a dark grey and
light grey before hanging on the white screen.  No other response, with or
without the A2630 card in (well the power light only changes intensity once
with the 2630 out...)

  monty@sagpd1.UUCP (Monty Saine) wrote that I should check the power
levels.  What is the correct way to do this?  In the past I've used one of
the free connectors off of the power supply while the main connector was
connected to the mother board.  Is this adequate?

  And now for the really frustrating one.  I thought that I had debugged my
friends machine.  So I desoldered and soldered on a new U202 74LS157 that
multiplexes the signals from denise to the mouse.  And when I powered back
on it seemed to be working (not that I hadn't gotten that response for a
few seconds from the old chip too) but then horizontal movement disappeared
again.

  To recap: On both machines the problem is not
	Denise
	Paula
	Gary
	Buster
	Rom
	68000
because I swapped them from one machine to the other and both machines
behave the same as they did before.  I have tried swapping the two CIAs on
my 2000 and still have had no luck.  I am still hunting and very
frustrated.  Anyone want to sell me an old Agnus and chip puller?
Anyone want two A2000's cheap?  Aaargh.
  I am a frustrated cowpoke people.
	Charlie
-- 
Thats fineberg@wums2.bitnet or fineberg@wums2.wustl.edu in dog years!
-- 
Charlie Fineberg	Biochemistry Dept., Wash. U. Sch. of Medicine (WUMS)
Box 8231, 4566 Scott Ave.		  BITNET: FINEBERG@WUMS
St. Louis, MO 63110			internet: fineberg@wums2.wustl.edu
"The younger Mr. Popplewick is not permitted to expect anybody" - Mr. Popplewick