Almost Fixed a Stargate Rev A Board

Jesse69

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I Almost Fixed a Stargate Rev A Board... The pics below show the error screen before I changed capacitors and the 5114 cmos ram and the D10 IN4001 diode. The CMOS Error screen told me my5114 cmos ram was bad.
 

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Now after fixing the game plays well and doesn't reset but on every bootup it says "All System Go" but the next screen says "Adjustment Failure" and it keeps resetting the High Score table.

So how do I fix an "Adjustment Failure?"

Fresh 1.5 V batteries are installed.
 

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Now after fixing the game plays well and doesn't reset but on every bootup it says "All System Go" but the next screen says "Adjustment Failure" and it keeps resetting the High Score table.

So how do I fix an "Adjustment Failure?"

Fresh 1.5 V batteries are installed.

Go into your settings have select the options to clear high scores, and reset to factory settings and see if that helps.
 
Tried that and it didn't work, still said "Adjustment Failure."

I popped in a different 5114 and still the same error...
 
I have a Joust that kept having problems with booting and resets. Replacing the ribbon cable from the ram board to the rom board with a ribbon from Bob Roberts fixed it right up.
 
I have 2 other perfectly working Stargate Main pcbs and when I switch them in no problems so it can't be the connectors. Just something wrong with the Rev A board.
 
Ok, thanks for the battery holder advice... I measured the voltages at the battery holder solder base interfaces and they weren't 1.5v, so I removed the batteries and sanded the rusted / corroded contacts. Then I reinstalled the batteries and measured 1.5V at the base.

Now, upon restarting, no more "Adjustment Failure" screen and I don't have to keep the coin door open. Seems like corroded battery contacts were the fault.

Tried to play the game but the machine reset on me for the first time.
 
Tried to play the game but the machine reset on me for the first time.

It looks like with the work you done you had the CPU out a few times. I would start by reflowing the solder on the headers of the CPU board. Then do the same on the power supply board. Also look for burnt connectors on the PS.
 
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OK edit... It still has the "Adjustment Failure" screen on bootup... despite the battery holder scrubbing.

I turned it off & on several times and it was ok, no "Adjustment Failure" screen. I guess this screen would sometimes pop up...
 
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If there was corrosion on the contacts on the battery, there may be corrosion at the connectors. The best way to test this to check the voltage at the CMOS chip. It should measure 3.0VDC or better at the CMOS chip when the power is off to the CPU board.

ken
 
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