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- Path: sparky!uunet!gatech!usenet.ins.cwru.edu!agate!doc.ic.ac.uk!warwick!maufr
- From: maufr@csv.warwick.ac.uk (Mr N E Plum)
- Newsgroups: comp.sys.acorn
- Subject: Re: RiscOS power up self test and PCB damage
- Followup-To: comp.sys.acorn.tech
- Date: 10 Jan 1993 01:51:10 -0000
- Organization: Computing Services, University of Warwick, UK
- Lines: 35
- Distribution: world
- Message-ID: <1inveeINN773@mace.csv.warwick.ac.uk>
- References: <1993Jan06.141739.10787@news.mentorg.com> <1993Jan8.170323.13443@unix.brighton.ac.uk>
- NNTP-Posting-Host: mace.csv.warwick.ac.uk
-
-
- In article <1993Jan8.170323.13443@unix.brighton.ac.uk>, rjb12@unix.brighton.ac.uk (Titch) writes:
- | I recently upgraded my A5000 to RO3.1 and after about a week funny things
- | started to happen. I think I may have pressed the ROMs down too hard, because
- | I too got a red screen and a blinking light on the floppy drive. The sequence
- | of blinks is a system status report (the sequence consists of 32 blinks) which
- | tells you what's wrong with the system. Apparently I had a RAM problem, probably
- | caused by a broken track due to my hamfistedness.
- |
- | Luckily the thing was still under guarantee so it was fixed for free.
-
- This seems to happen to quite a few people. A friend upgraded his A3000 to
- RO3.1 and had the same kind of problem, but in this case he got no display
- at all. We eventually tracked it down to a problem with grounding the VIDC
- by prodding the PCB. At a certain point one's finger would bridge a pad and
- an earth track, whereupon we got a display. BTW the pad was about 1 cm east
- of the VIDC, which is a long way from the ROMs and how my friend could have
- cracked a crack there by changing ROMs is baffling. Are Acorn's PCBs
- unusually fragile? We don't have access to a circuit diagram so we have
- no idea what this is all about (can give more precise details via email).
- So we connected the two with a 10M resistor and the machine worked fine.
- Two points:
- 1) is the grounding in the VIDC area really this marginal?!
- 2) Can anyone tell me where to find (or post, if it's not too long)
- details of how to decode the errors given via the floppy drive light?
-
- Nicolai
-
- /----------- Nicolai E. M. Plum -----------------------------------------\
- | mail to: maufr@warwick.ac.uk or cstadgh@warwick.ac.uk |
- | First Year Student of Mathematics at The University of Warwick, England|
- \------------------------------------------------------------------------/
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