9 Jul
2001
9 Jul
'01
3:42 p.m.
Hi,
I got a good deal of a Commodore 1701 monitor on eBay, just that
it was not well packed and damaged during the USPS trip. Now I
have a lightly damaged enclosure with everything inside apparently
working except the horizontal scan. The picture is squeezed into
one single vertical line in the middle of the screen. So, what's
next?
Does anyone have a schematics of that monitor, so I could find
my way through without an oscilloscope? Any idea how I could
get an oscilloscope for repairing this? Any idea where I should
start?
I once repaired something on a TV set which was amazingly simple,
but I'm not sure I can redo that here without help.
Thanks,
-Gunther
--
Gunther Schadow, M.D., Ph.D. gschadow(a)regenstrief.org
Medical Information Scientist Regenstrief Institute for Health Care
Adjunct Assistant Professor Indiana University School of Medicine
tel:1(317)630-7960 http://aurora.regenstrief.org
9 Jul
9 Jul
6:52 p.m.
On Mon, 9 Jul 2001, Gunther Schadow wrote:
I got a good deal of a Commodore 1701 monitor on eBay,
just that it
was not well packed and damaged during the USPS trip. Now I have a
lightly damaged enclosure with everything inside apparently working
except the horizontal scan. The picture is squeezed into one single
vertical line in the middle of the screen. So, what's next?
Call whatever shipping company handled it and ask them what form you need
to fill out to get them to pay for your damaged item :(
Or contact the seller and tell him it was his fault for not properly
packing it. Probably have better luck with the shipper, but they may balk
because of the poor packaging.
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
10 Jul
10 Jul
4:32 a.m.
Hello Gunther Schadow,
Check for cracks near the deflection cable for the vertical, and check to see if
the high voltage cap this is in the vertical circuit is okay, it maybe defective.
I have the schematics at the shop somewhere I'll look if you want and scan as
necessary.
Bill
Sellam Ismail wrote:
On Mon, 9 Jul 2001, Gunther Schadow wrote:
I got a good deal of a Commodore 1701 monitor on
eBay, just that it
was not well packed and damaged during the USPS trip. Now I have a
lightly damaged enclosure with everything inside apparently working
except the horizontal scan. The picture is squeezed into one single
vertical line in the middle of the screen. So, what's next?
Call whatever shipping company handled it and ask them what form you need
to fill out to get them to pay for your damaged item :(
Or contact the seller and tell him it was his fault for not properly
packing it. Probably have better luck with the shipper, but they may balk
because of the poor packaging.
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
10 a.m.
bill claussen wrote:
Check for cracks near the deflection cable for the
vertical, and check to see if
the high voltage cap this is in the vertical circuit is okay, it maybe defective.
I have the schematics at the shop somewhere I'll look if you want and scan as
necessary.
Hi Bill, thanks for you help! Let me ask you, did you really mean "vertical
circuit"? My problem seems to be with horizontal deflection since all I see
is one vertical line with colors matching the image. Where is that
circuit physically located in the box? My box seems to have received a smack
on the right side (looking from the rear). There seems to be some separate
aggregate on that side. But I can't see anything obviously damaged here. I'd
need to focus in more to be able to find something. Eventually I need to
measure I guess. Is there anything I could debug without a scope?
(I'm now hunting for a scope on ebay, but those go away like crazy and I'm not
even going to be sure whether the unit I will receive will work ... I don't
want to end up having to repair the scope in order to repair the monitor :-)
Yes, if you could scan those schematics, I'd be glad!
thanks much!
-Gunther
Bill
Sellam Ismail wrote:
> On Mon, 9 Jul 2001, Gunther Schadow wrote:
>
> > I got a good deal of a Commodore 1701 monitor on eBay, just that it
> > was not well packed and damaged during the USPS trip. Now I have a
> > lightly damaged enclosure with everything inside apparently working
> > except the horizontal scan. The picture is squeezed into one single
> > vertical line in the middle of the screen. So, what's next?
>
> Call whatever shipping company handled it and ask them what form you need
> to fill out to get them to pay for your damaged item :(
>
> Or contact the seller and tell him it was his fault for not properly
> packing it. Probably have better luck with the shipper, but they may balk
> because of the poor packaging.
>
> Sellam Ismail Vintage Computer Festival
> ------------------------------------------------------------------------------
> International Man of Intrigue and Danger http://www.vintage.org
--
Gunther Schadow, M.D., Ph.D. gschadow(a)regenstrief.org
Medical Information Scientist Regenstrief Institute for Health Care
Adjunct Assistant Professor Indiana University School of Medicine
tel:1(317)630-7960 http://aurora.regenstrief.org
10:15 a.m.
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12:11 p.m.
Chuckling, My post should have read horizontal! I'd be happy to get the scans for
you
and send to you. Check for cracks around the flyback transformer as well. Now all I
have to do is find the manual. It's here but just where is the question.
I agree with Tony, you won't need a scope.
Bill
Tony Duell wrote:
I would agree. This is a horizontal deflection problem.
Check for cracks near the deflection cable for the
vertical, and check to see if
the high voltage cap this is in the vertical circuit is okay, it maybe defective.
I have the schematics at the shop somewhere I'll look if you want and scan as
necessary.
Hi Bill, thanks for you help! Let me ask you, did you really mean "vertical
circuit"? My problem seems to be with horizontal deflection since all I see is one vertical line with colors matching the
image. Where is that
circuit physically located in the box? My box seems to have received a smack
on the right side (looking from the rear). There seems to be some separate
Interestingly, the horizontal output circuit in just about every monitor
is on the RHS as seen from the rear. There are a few exceptions to this,
though. The easiest way to find the horizontal output circuit is to find
the flyback transformer (trace the HV cable from the side of the CRT
flare, although if I have to tell you to do that, you probably should be
reading a book on TV operation and repair before you get to work on this
monitor).
aggregate on that side. But I can't see
anything obviously damaged here. I'd
need to focus in more to be able to find something. Eventually I need to
measure I guess. Is there anything I could debug without a scope?
If the monitor has received a heavy knock, then it's possible that some
large/heavy componnts have either broken their soldered connections to
the PCB, or have pulled the pads away from the PCB and broken the tracks.
Look for that sort of damage.
Alternatively, the widings on coils, etc may have been broken away from
their solder tags. This sort of damage is easy to repair, normally.
(I'm now hunting for a scope on ebay, but those go away like crazy and I'm not
even going to be sure whether the unit I will receive will work ... I don't
want to end up having to repair the scope in order to repair the monitor :-)
I don't think you'll need a 'scope for this one...
-tony
8:53 a.m.
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10:30 a.m.
to provide photographs of the missing items? Come
again??? I almost sent
them a blank photograph with the caption 'Here are the missing items. You
can't see them because they are missing'.
I've got to remember this on the chance that some US shipping service does
a similar thing. Priceless Tony, just *priceless*. *rofl*
g.
11 Jul
11 Jul
1:45 a.m.
At 03:30 PM 7/10/01 -0700, Gene Buckle wrote:
At the risk of stating the obvious, it's not unusual to
photograph something of value for insurance purposes, and
of course this has to be done before it is lost. What's
wrong with asking if you have any proof that the item was
in the box? Perhaps you have the photo, perhaps you don't.
Fraud has to be foremost in the mind of anyone receiving
and processing claims like this. For that matter, anyone
selling or shipping anything must be wary of this, too.
If you sold 20 pounds of old computer junk to someone on
eBay, and they claimed the box only had 3 pounds in it
when it arrived, wouldn't it help to have a picture of
the junk in the box before the box was taped for shipment?
- John
to provide
photographs of the missing items? Come again??? I almost sent
them a blank photograph with the caption 'Here are the missing items. You
can't see them because they are missing'.
I've got to remember this on the chance that some US shipping service does
a similar thing. Priceless Tony, just *priceless*. *rofl*
7:01 a.m.
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10 Jul
10 Jul
8:22 a.m.
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15 Jul
15 Jul
4:14 p.m.
Folks, many thanks to all your encouraging words, Sellam, Tony, and
Bill. I didn't need a scope indeed. I almost didn't even need a multi-
meter. Just needed to clean up my workbench, open the box, take out
the main board and put it into some good light to see the serious crack
at the margin of the right side. Fortunately it was a boring corner of
the board, so two bridges could be quickly soldered on and fixed the
problem. Ah welcome back in Commodore 64 land. Back in 1988 I could
not afford the 1701 monitor, now I can enjoy full color, 256 colors,
woa! :-)
PS: can anybody give me a hint with playing quest for tires? [blush]
regards
-Gunther
--
Gunther Schadow, M.D., Ph.D. gschadow(a)regenstrief.org
Medical Information Scientist Regenstrief Institute for Health Care
Adjunct Assistant Professor Indiana University School of Medicine
tel:1(317)630-7960 http://aurora.regenstrief.org
8561
days inactive
8567
days old
11 comments
6 participants
participants (6)
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ard＠p850ug1.demon.co.uk -
elecdata＠kcinter.net -
foo＠siconic.com -
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jfoust＠threedee.com