Atari 1024ST-FM questions... - comp.sys.atari.st

Message from discussion Atari 1024ST-FM questions...

Mark Bedingfield

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More options May 12, 7:43 am

Newsgroups: comp.sys.atari.st

From: Mark Bedingfield <atari...@nomorespampleaseoptusnet.com.au>

Date: Mon, 12 May 2008 21:43:41 +1000

Local: Mon, May 12 2008 7:43 am

Subject: Re: Atari 1024ST-FM questions...

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Mitchell Spector wrote:
> Mark Bedingfield <atari...@nomorespampleaseoptusnet.com.au> wrote:

>> Mitchell Spector wrote:
>>> If I don't have one available, will it still boot into GEM?
>>> (seems to me my 520 ST-FM did if I left it on long enough)
>> Yes it should, but it can take a while. Initially you should get a white
>> screen.

> Never see anything but a black screen. Something isn't right then.

>>> Either the RF modulator is faulty or something else is
>>> blown.
>> Possibly the video shifter? Tho I'll ask the obvious and ask if you have
>> tried tuning it?

> Nope! I did notice a small metal cage with a liftable top cover. Is there
> a potentiometer under here that might help? So I just twist it a bit and see
> if a picture appears, or is there more to it than that?

Easier than that, I mean tuning the TV;-)

>> All disks are bootable as far as the Atari is concerned. just drop a
>> blank one in. Another problem is that the composite video is derived
>>from the RF modulator, so if it is faulty then composite won't work either.

> Well RF video would be passable enough to get started with, at least
> to test things out. I tried pressing down on the socketed chips like
> someone here mentioned (only two or three in this case) but that didn't
> seem to do anything. Could the video shifter be the problem, or is bad
> RAM more likely?

Bad RAM in my experience is not that likely. I've only ever had one
Atari with bad ram and that was a 130XE. Shifter would be my first
thought if the audio was working. Then again there is plenty between the
shifter and the modulator than could be at issue. The vast majority of
faults I see with ele\ctrical gear is capacitors. But I'd try tuning the
TV and/or an AV lead first. It'd be better to eliminate the obvious.

Mark

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