Re: TECH: Tempest reset line question

In a message dated 2/2/04 12:05:33 AM Eastern Standard Time,
whooshdoo@hotmail.com writes:

>
> The reset circuit shows 3.2v and doesn't change when I press the reset
> button. What voltage should this be at normally and what voltage should it
> change to when the reset button is momentarily pushed in?
>
> Also the outputs of the 74LS193 @ C4 for the 6 MHZ signal are not pulsing,
> but their respective inputs are. Should those outputs be pulsing as well?
> Could this indicate a bad chip?
>
> BTW, the +/-22v is at +/-24.7v. Is this ok? Other than that all power
> connections and voltages seem to be fine.
>
> Thanks much!,
> Roger
>

Hey Roger, I dont have a Tempest but I have rebuilt both the AR-1 and AR-2
boards and I know nothing will work untill you have your +5volts. You should
measure it at the test points on the AR-2 board. If you have 3.2volts on your
main +5Volt line then you have a short somewhere pulling it down which should
smoke something or your 5 volt regulator is bad. Also check all pins on the AR-2
board where the molex plugs into. You may have a broken solder joint. The +/-
24volt should be fine, thats used by the monitor.
Good Luck
Sam
In Virginia

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Received on Mon Feb 2 00:15:32 2004