Gorf Reboot Issue

thepita007

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The Problem:

Game powers on but when you coin it up and press p1 start it reboots.

What I have tried:

I measured the voltages coming off the power supply and at various points and they were all with acceptable ranges. The reset pin reads +5.0 v is that normal?

I put the game in test mode and got the letter G which I found means bad rom. I tried to clean and reseat the rom but this didnt work so I should have a new one by this weekend.

I cleaned and reseated all the boards but this also had no effect on the issue.

appreciate any help!

Thanks
 
Sometimes a ROM label falls off, and ends up in the connectors at the bottom of the cage, effectively insulating the PCB from the connector.

It's a long shot, but I have seen it happen.
 
Sometimes a ROM label falls off, and ends up in the connectors at the bottom of the cage, effectively insulating the PCB from the connector.

It's a long shot, but I have seen it happen.

found some labels down there but none were in the actual sockets. Never would of thought of that thanks for the suggestion.
 
I had the same problem, it was a bad Rom..Make sure you get a 2532, and you may have to alter some pins to make it work.. I cant remember exactly, but I used the schematic and a pinout to get it working..
 
The Problem:
Game powers on but when you coin it up and press p1 start it reboots.

I had this exact same issue. In my case, turning up the voltage for the +5 to about 5.5 cleared it up. However, I know that is not advisable. I finally determined it to be a bad resistor on the small RGB board that is separate from the cage. I tested another known good RGB board, with +5 right at 5.00 and all worked fine. A tech friend pointed me to 1 of 3 possible resistors on my bad RGB board and when I took readings on them, sure enough, one was bad. I replaced that and my (once bad) RGB board was good to go and my game worked after that.

Normally your supposed to take readings on resistors out of circuit, but in my case, I got lucky and got a good reading in circuit on two of them and bad on one, so I only had to desolder/solder one.

If you're interested in going this route, try turning up the +5 to see if that clears it up first, and if so, then I can point you to the 3 resistors to check (I don't remember off hand).
 
Did you also measure the voltages on the failing ROM? The symptom sounds like the processor going off into the weeds when it runs code from that particular ROM (triggering a watchdog reset) .. so I would suspect either bad connections/power, corrupt data, or possibly a bad part. If you're sure it's seated and contacting correctly with good power, you might just try reprogramming it before replacing the part entirely.

Regarding the reset line level - it's active low, so during normal operation it will be high. If watchdog or other external circuit is tripping, you would see it assert low briefly.

LeChuck
 
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