27 Apr
2004
27 Apr
'04
5:38 p.m.
I would take
everything out, memory, drives etc., use a known
good apple brand mouse and keyboard and see if some minimum
system doesn't get some kind of response. ADB, SCSI, and
memory can all look like this IIRC.
I thought the fx required memory to be present to boot? So far my minimal
system has been system ROM/memory/known good kb/rodent but I still don't get
+5V on the ADB cable to the keyboard or anywhere on the motherboard
connector.....it's looking very dead-PSU-ish now.
28 Apr
28 Apr
7:19 a.m.
-----Original Message-----
From: cctalk-bounces(a)classiccmp.org
[mailto:cctalk-bounces@classiccmp.org] On Behalf Of Seth Lewin
Sent: 28 April 2004 03:38
To: cctalk(a)classiccmp.org
Subject: Re: Mac Iifx Update
I had a somewhat similar experience with a Iici - there's
something touchy about the portion of the power supply
circuitry that trickles a milliamp or so of +5 to the logic
board to enable startup. Also - does the fx PSU have one of
those push-and-lock-in power switches on the back? Iici's do
and sometimes fiddling with that will have a beneficial
effect. Worth a try.
It's a push-to-make power button rather than a switch....I'm currently
trying to find time to check the PSU but my new job starts on tuesday so
this is my last week of unemployment!
Cheers
w
7:34 a.m.
Seth Lewin <sml49(a)comcast.net> wrote:
I had a somewhat similar experience with a Iici - there's something touchy
about the portion of the power supply circuitry that trickles a milliamp or
so of +5 to the logic board to enable startup. Also - does the fx PSU have
one of those push-and-lock-in power switches on the back? Iici's do and
sometimes fiddling with that will have a beneficial effect. Worth a try.
Eleven years ago, 1993, this was the reason I got on the internet. I had
a IIcx that didn't want to start. Over a few months it got worse and
worse. Until it wouldn't start at all anymore.
So I searched usenet and found that the IIci and IIcx power suppilies
were all failing in the same manner. Dead solder joints on the trickly
charge portion of the unit.
It said to take the PSU apart and re-solder every joint on the entire
circuit board. Because who knows which one went bad.
I did it, and the PSU has worked fine ever since!
--
tim lindner
tlindner(a)ix.netcom.com Bright
I would take everything out, memory, drives etc., use
a known
good apple brand mouse and keyboard and see if some minimum
system doesn't get some kind of response. ADB, SCSI, and
memory can all look like this IIRC.
I thought the fx required memory to be present to boot? So far my minimal
system has been system ROM/memory/known good kb/rodent but I still don't get
+5V on the ADB cable to the keyboard or anywhere on the motherboard
connector.....it's looking very dead-PSU-ish now.
8 a.m.
-----Original Message-----
From: cctalk-bounces(a)classiccmp.org
[mailto:cctalk-bounces@classiccmp.org] On Behalf Of tim lindner
Sent: 28 April 2004 17:34
To: cctalk(a)classiccmp.org
Subject: Re: Mac Iifx Update
So I searched usenet and found that the IIci and IIcx power
suppilies were all failing in the same manner. Dead solder
joints on the trickly charge portion of the unit.
It said to take the PSU apart and re-solder every joint on
the entire circuit board. Because who knows which one went bad.
I did it, and the PSU has worked fine ever since!
Oddly enough this PSU has a lot of dull looking connections on it so
resoldering is exactly what I'm going to do :)
Cheers
w
8:23 a.m.
On Wed, 28 Apr 2004, tim lindner wrote:
So I searched usenet and found that the IIci and IIcx
power suppilies
were all failing in the same manner. Dead solder joints on the trickly
charge portion of the unit.
It said to take the PSU apart and re-solder every joint on the entire
circuit board. Because who knows which one went bad.
Well, THAT'S good to know. Seems even more useful than the "take the PRAM
battery out" trick.
--
Sellam Ismail Vintage Computer Festival
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8:45 a.m.
-----Original Message-----
From: cctalk-bounces(a)classiccmp.org
[mailto:cctalk-bounces@classiccmp.org] On Behalf Of Vintage
Computer Festival
Sent: 28 April 2004 18:23
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Mac Iifx Update
It's a bit drastic for people who get The Fear from soldering irons though:
Stage 1: replace PRAM battery
Stage 2: leave PRAM battery out for 24 hours
Stage 3: fully dismantle and resolder entire PSU
:o)
Cheers
w
It said to take the PSU apart and re-solder every
joint on
the entire
circuit board. Because who knows which one went
bad.
Well, THAT'S good to know. Seems even more useful than the
"take the PRAM battery out" trick.
7340
days inactive
7341
days old
5 comments
4 participants
participants (4)
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sml49＠comcast.net -
tlindner＠ix.netcom.com -
vcf＠siconic.com -
witchy＠binarydinosaurs.co.uk