Re: Gauntlet pcb woes

This probably won't help, but I had a Klax once that wouldn't come up
and the problem was one of the control panel buttons was physically
stuck in the "on" position. You wouldn't think something like that
would matter but it can.

Some games do weird stuff if the buttons are stuck. For example, some
games (Speed Freak comes to mind) goes into selftest if the start button
is down during power up. Others just do weird stuff (Klax as above,
Breakout won't reset bricks, etc.).

Andrew Wilson wrote:

>Good suggestions below - this is roughly what I did when fixing my board. I
>dimly recall that you can boot the board up in test mode even with a bad
>6502, so don't worry too much about the 6502 CPU at first.
>
>Hot RAMs are a bad sign (of course :) - a set of the RAM chips are needed
>even just to fire up the board in test mode. When this was happening on my
>board, I pulled the hot RAM chips, and swapped the others around until the
>board would come up in test. I don't recall seeing anything in the manual to
>tell me which RAM and ROM chips are required for test, though.
>
>Another note - when I had bad RAM chips, I was still able to get a video
>signal (garbage) that would just reset every few seconds when the watchdog
>timer tripped.
>
>-atw
>
>-----Original Message-----
>From: owner-rasterlist@vectorlist.org
>[mailto:owner-rasterlist@vectorlist.org]On Behalf Of Jess Askey
>Sent: Thursday, October 16, 2003 11:14 PM
>To: rasterlist@vectorlist.org
>Subject: Re: RASTER: Gauntlet pcb woes
>
>
>this is a good general starting process.
>
>1. Verify DC voltages, the +12/15V controls the reset line usually on
>Atari boards
>2. Verify no AC ripple on the power supply (usually not an issue with
>switching power supplies but sometimes)
>3. Check for CPU clock signal (pulsing)
>4. Check that Reset pin is high. If low, then check reset logic.
>5. Pull all ROMs that are not required for self test to run (generally
>noted in manual)
>6. Start replacing all socketed chips on at a time
>7. Replace all excessively hot IC's
>8. Get out the schems!! :-)
>
>Christopher Bedwell wrote:
>
>
>
>>I got my hot hands on a gauntlet pcb - its not firing
>>up at all, no sound - no picture..
>>
>>Suggestions for where I should start ?
>>
>>Some socketed rams ( I assume ) are getting hot, the
>>processor is warm.. theres power getting in, the led's
>>are firing up..
>>
>>- Chris.
>>
>>=====
>>
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>>
>>
>>
>
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>
>
>

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Received on Sun Oct 19 01:39:29 2003