7 Feb
2004
7 Feb
'04
12:47 p.m.
Got a Perq 2T1 with the KME 1514 portrait monitor - the display on the
front of the unit gets as far as 999 on power-up so it's looking
reasonably healthy. Only problem is an unstable display; it seems to be
missing out every 4th or so scanline, plus there's some horizontal
instability (I can see what appear to be characters on the display, but
they aren't readable at all)
Anything prone to giving up in these monitors? From looking on the web
it appears they have a few custom parts in them :( (of course it's
*possible* the fault is in the system, not the monitor I suppose)
Oh, and if anyone's dishing out Perq wisdom there's also a Perq 1 with a
display fault too - on that one the image is centered on the screen, but
squashed into about 80% of the normal width, and maybe 10% of normal
height. It's also very non-rectangular in nature.
cheers
Jules
7 Feb
7 Feb
2:27 p.m.
-----Original Message-----
From: cctalk-bounces(a)classiccmp.org
[mailto:cctalk-bounces@classiccmp.org] On Behalf Of Jules Richardson
Sent: 07 February 2004 23:35
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Perq 2T1 display fault
Got a Perq 2T1 with the KME 1514 portrait monitor - the
display on the front of the unit gets as far as 999 on
Oh, and if anyone's dishing out Perq wisdom there's also a
Perq 1 with a display fault too - on that one the image is
Tony's yer man for PERQ stuff, though I can guess the PERQ 1 is suffering
bad components in the horizontal and vertical deflection circuits...
Cheers
--
Adrian/Witchy
Owner & Webmaster, Binary Dinosaurs
www.binarydinosaurs.co.uk - possibly the UK's biggest online computer museum
www.snakebiteandblack.co.uk - ex-monthly gothic shenanigans :o(
2:34 p.m.
Quothe Jules Richardson, from writings of Sat, Feb 07, 2004 at
11:35:06PM +0000:
Got a Perq 2T1 with the KME 1514 portrait monitor -
the display on the
front of the unit gets as far as 999 on power-up so it's looking
reasonably healthy. Only problem is an unstable display; it seems to be
missing out every 4th or so scanline, plus there's some horizontal
instability (I can see what appear to be characters on the display, but
they aren't readable at all)
One of my PERQ T2's had a similar problem years ago, but that was with
the 19" landscape Moniterm monitor. To solve the problem, I simply
replaced the PLL chip in the monitor.
Anything prone to giving up in these monitors? From
looking on the web
it appears they have a few custom parts in them :( (of course it's
*possible* the fault is in the system, not the monitor I suppose)
Did you try reseating the boards or just letting the maching run for
hours and hours? Is the problem intermittent?
Oh, and if anyone's dishing out Perq wisdom
there's also a Perq 1 with a
display fault too - on that one the image is centered on the screen, but
squashed into about 80% of the normal width, and maybe 10% of normal
height. It's also very non-rectangular in nature.
Never experienced that problem with my PERQ-1 systems... the only
major thing that ever went wrong with them were head crashes. :-( For
those not familiar with these machines, they had either SA4004 or
SA4008 14", 12MB and 24MB, hard drives... not easy to find
replacements for, alas.
--
Copyright (C) 2003 R. D. Davis The difference between humans & other animals:
All Rights Reserved an unnatural belief that we're above Nature &
rdd(a)rddavis.org 410-744-4900 her other creatures, using dogma to justify such
http://www.rddavis.org beliefs and to justify much human cruelty.
9 Feb
9 Feb
12:37 a.m.
On Sun, 2004-02-08 at 01:22, R. D. Davis wrote:
Yuck. Not sure how alive that one is. I can tell they're both going to
be another couple of those headache machines where I can't work out how
to back up the data ready for when the drives do eventually die :(
We may have drive replacements for the Perq-1 in store, but I'm betting
we don't have original install media...
cheers
Jules
Quothe Jules Richardson, from writings of Sat, Feb 07,
2004 at
11:35:06PM +0000:
Hmm, there isn't a lot in the way of ICs in these monitors by the looks
of it - I noticed an LS device which is presumably part of the sync
separation circuitry, then there was a TDA1170 device on the board too.
I seem to remember those are used in Microvitec CUB monitors and are
prone to failure (I have some spares somewhere), but I can't remember
what sort of symptoms they give when they fail.
Got a Perq 2T1 with the KME 1514 portrait monitor
- the display on the
front of the unit gets as far as 999 on power-up so it's looking
reasonably healthy. Only problem is an unstable display; it seems to be
missing out every 4th or so scanline, plus there's some horizontal
instability (I can see what appear to be characters on the display, but
they aren't readable at all)
One of my PERQ T2's had a similar problem years ago, but that was with
the 19" landscape Moniterm monitor. To solve the problem, I simply
replaced the PLL chip in the monitor. Did you try reseating the boards or just letting the
maching run for
hours and hours? Is the problem intermittent?
yes, yes and no :-)
It doesn't seem to be temperature-related anyway. At least the HV
circuitry is still alive, so fingers crossed it's fixable...
Oh, and if
anyone's dishing out Perq wisdom there's also a Perq 1 with a
display fault too - on that one the image is centered on the screen, but
squashed into about 80% of the normal width, and maybe 10% of normal
height. It's also very non-rectangular in nature.
Never experienced that problem with my PERQ-1 systems... the only
major thing that ever went wrong with them were head crashes. :-( For
those not familiar with these machines, they had either SA4004 or
SA4008 14", 12MB and 24MB, hard drives... not easy to find
replacements for, alas. 
8 Feb
8 Feb
11:16 p.m.
On Sat, 2004-02-07 at 23:35, Jules Richardson wrote:
Oh, and if anyone's dishing out Perq wisdom
there's also a Perq 1 with a
display fault too - on that one the image is centered on the screen, but
squashed into about 80% of the normal width, and maybe 10% of normal
height. It's also very non-rectangular in nature.
Monitor being fed too high a voltage? Too *low* a voltage to the
scanning? Might just be out of adjustment - possibly someone's fiddled
with all the trimmers. We used to call TVs in that condition "NICAM"
sets, Nasty Intruder Caused Absolute Mayhem.
Gordon.
9 Feb
9 Feb
9:42 a.m.
On Mon, 2004-02-09 at 02:04, Gordon JC Pearce wrote:
Monitor being fed too high a voltage? Too *low* a
voltage to the
scanning? Might just be out of adjustment - possibly someone's fiddled
with all the trimmers. We used to call TVs in that condition "NICAM"
sets, Nasty Intruder Caused Absolute Mayhem.
"But sir, all the screws were loose in those little tin cans, so I
tightened 'em all down."
19 Feb
19 Feb
10:54 a.m.
On Mon, 2004-02-09 at 02:04, Gordon JC Pearce wrote:
We used to call it 'digital interference' :-) I once had a VCR in for
repair where the idiot owner hadn't realised you had to tune the TV set
to the RF ouput of the CCR, and had, instead, twiddled every electronic
and mechanical adjustment in an attempt to get a picture. Sorting that
mess out took a long time!
Incidentally, for those not in Europe, NICAM (Near Instantaneous
Companded Audio Multiplex) is a digitial stereo sound system used on TV's
over here. I built a NICAM decoder way back in the early 1990s....
-tony
Monitor being fed too high a voltage? Too *low*
a voltage to the
scanning? Might just be out of adjustment - possibly someone's fiddled
with all the trimmers. We used to call TVs in that condition "NICAM"
sets, Nasty Intruder Caused Absolute Mayhem.
7440
days inactive
7452
days old
6 comments
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participants (6)
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ard＠p850ug1.demon.co.uk -
gordonjcp＠gjcp.net -
julesrichardsonuk＠yahoo.co.uk -
rdd＠rddavis.org -
tomj＠wps.com -
witchy＠binarydinosaurs.co.uk