The first thing I do when repairing an Asteroids, Tempest or anything
else with an AR or AR2 is to solder jumpers on the back of the 9 pin
plug, connecting 1 to 2, and 3 to 6. I don't trust the whole "+/- sense,
self regulation" deal. If a little dirt or corrosion sets in on the board's
edge connector, the AR can boost up the voltage, possibly damaging
the board. This way, you have a plain 5V supply that can only
experience some voltage drop.
Brendan Keith
> ----------
> From: Alan J McCormick[SMTP: ]
>
> A while ago I asked the VL-gestalt about how to go about testing my 3ft
> stack of Audio Reg 2 pcbs. No suggestions were offered. Whatever...
>
>
> I'm worried about one of these repaired AR2 boards going nuts and dumping
> 10.3v on the 5v line <cringe>.
>
> I know John Robertson had suggested some sort of crowbar circuit but I
> never followed up on it.
>
> The mighty uber-hacker and all-around great guy Clay mentioned some
> "crowbar diodes".
>
>
