repairing h-scan on a Commodore 1701

From: Gunther Schadow <gunther_at_aurora.regenstrief.org>
Date: Tue Jul 10 17:00:32 2001

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_at_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
Received on Tue Jul 10 2001 - 17:00:32 BST

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