| Troubleshooting Advice [message #37814] |
Fri, 15 February 2013 23:27  |
bob
Messages: 108
Registered: February 2013
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<pre>
Message-ID: <1785@harpo.UUCP>
Date: Fri, 3-Jun-83 11:17:59 EDT
Article-I.D.: harpo.1785
Posted: Fri Jun 3 11:17:59 1983
Date-Received: Wed, 8-Jun-83 23:16:20 EDT
Sender: notes@harpo.UUCP
Organization: Bell Labs, Whippany
Lines: 18
#N:harpo:25900001:000:792
harpo!bob Jun 3 11:10:00 1983
My Atari 800 has developed a problem. It is used with a TV as opposed to
a monitor , and the problem exists when all peripherals are disconnected
and unplugged. Bars of video distortion and noise (horizontal) drift slowly
thru the screen at a steady rate. The bars (only one at a time) occupy
about 1/5 of the screen, and the remainder of the screen looks less sharp
than usual. Inserting and removing a program ROM a few times seems
to clear up the problem, but
the next time the computer is turned on, it is likely to be back. Looks like
an interference problem to me , as I get the same results on another tv.
Is my modulator dying? Bad grounding somewhere? Has anyone else encountered
a similar problem?
R. L. Carroll
Bell Labs
201-386-2609
Whippany, N.J
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| Re: Troubleshooting Advice - (nf) [message #37817 is a reply to message #37814] |
Fri, 15 February 2013 23:27  |
rasp
Messages: 3
Registered: February 2013
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Junior Member |
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<pre>
Message-ID: <379@bmcg.UUCP>
Date: Mon, 13-Jun-83 14:48:06 EDT
Article-I.D.: bmcg.379
Posted: Mon Jun 13 14:48:06 1983
Date-Received: Tue, 14-Jun-83 16:43:27 EDT
References: harpo.1785
Lines: 21
I have heard of others with the same trouble, a wavy line
walking up the screen, so I'll broadcast an answer. The
problem seems to be a "retrace snake". This would be caused
if the ATARI were superimposing 60Hz onto the video signal.
You might note that the frequency exhibited by the "snake"
is that of the difference between 60Hz line frequency and
the vertical refresh rate which is quite close.
Look for any source of 60Hz. Bad grounding is certainly a
candidate; but, the most likely culprit is something gone
bad in the ATARI's power supply. If you have access to the
appropriate tools, check for either a bad rectifier, a bad
filter cap, or a bad regulator. If you're lucky, there is
even the possibility that the problem is as simple as the
end of the video cable that is plugged in INSIDE the case
has partially worked loose and needs only to be reseated.
Please let me know how you make out.
Ron Perloff
Burroughs Corp
16464 Via Esprillo
San Diego, CA 92128
619-451-4519
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| Re: Troubleshooting Advice - (nf) [message #37819 is a reply to message #37814] |
Fri, 15 February 2013 23:27 |
padpowell
Messages: 10
Registered: February 2013
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Junior Member |
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<pre>
Message-ID: <89@wateng.UUCP>
Date: Wed, 15-Jun-83 08:39:10 EDT
Article-I.D.: wateng.89
Posted: Wed Jun 15 08:39:10 1983
Date-Received: Thu, 16-Jun-83 07:03:26 EDT
References: <379@bmcg.UUCP>
Organization: U of Waterloo, Ontario
Lines: 3
WARNING: I plead with anybody trying to do this to not to play with
his high voltage supply. If you don't know what you are doing, leave
it alone! The usual penalty for ignorance is death, or at least
a whopping good shock
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