TECH: Gottlieb System 80B reset/lockup problem

Archived from groups: rec.games.pinball (More info?)

Have you replaced the main filter cap in the bottom of the cabinet?
Try measuring the -AC- votlage across that capacitor.

-- Ed


"Action Man" <biroschik2000@yahoo.com> wrote in message
news:2dqZe.3633$vw6.3349@newsread1.news.atl.earthlink.net...
>I have a Gottlieb Monte Carlo I am trying to get running. After 10-15
>seconds of play the machine would lock up, reset, or just generally go
>nuts.
>
>
>
> I have already:
>
> - Checked the voltage at C1 on the CPU - it's good
>
> - Replaced the 500 OHM trim pot on the power supply. The voltage is good -
> 5 volts.
>
> - Checked the connectors on the power supply. I did not replace them, but
> they appear to be OK.
>
> - Checked the ground wires on the transformer in the cabinet and made
> certain that they were all connected
>
> After the above efforts, I'm getting 5 volts nice and steady on the MPU.
> GI comes on. The score display, sounds, game, etc. is totally out.
>
> The red LED is always on on the sound board. If I disconnect the logic
> board, the solenoid fires a ball into the shooter lane, but there is no
> sound FX, score, gameplay etc.
>
> If I disconnect the sound board, there is no change in the game.
>
> This is one of my all-time favorite games (I love what I love), so I'd
> love to get it going. Any ideas as to what to do next is greatly
> appreciated!
>
> Steve
>
>