Joust error code

thebman80

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Seems that no matter how many chips I swap out I still get the same codes 134, 135, 136, 137 or 138. I had a spare Defender that had what looked like new 4116 chips on it and was swapping chips off it. So I would swap out a new 4116 at 135 then it would give me the 136 error code. So I swapped that out then I would get 137 swapped that chip out then 138 then when I swapped the last ram then it would cycle back and say 134 or 135 was bad. Any Ideas before I just crack the motherboard in half and burn it?

Adjusting Voltages really didn't do much to rectify the problem I would just get a solid 1 or 3 on the LED readout.

Some of the RAM must be bad because I could see bars on the Carpet screen maybe I should just order all new chips. I also replaced all the sockets in the last row with new ones was getting these error codes before the new sockets where installed.
 
Well Found part of the problem my -5V was not working right and I fixed that. But the game still isn't loading. Now A chip at location C1 is getting way to hot and to my surprise burnt the crap out of my finger when I touched it. TC5514Apl2 is the number on the chip the manual says its a 5114 static RAM? Once this started getting hot the game just shows lines and crap on the screen. Before I was getting a carpet pattern and error codes on the screen. I do have this hooked up to a switching power supply with a Jamma pinout. Maybe I shouldn't have messed with the volume knob that's when this started happening.
 
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Ok I let it cool down and tried it again and the carpet pattern and error codes are back again. But the chip at C1 gets hot really fast only being on only a few seconds. This it to the point where it will burn you if you held your finger on it very long. I turned the voltage way down to 4.7V from around 5v and the thing still stays incredibly hot any Ideas?
 
Check the voltage at pin 18 on Chip 1C, it should be +5V or less. That is the CMOS RAM chip that holds the settings and high scores. It should not be getting hot.

Because it is on the data bus, it can cause addressing errors if it goes bad.

ken
 
I'm getting a reading of 4.7v off pin 18. Also getting the message on screen that reads all scores reset, bookkeeping reset, and settings reset. The chip wasn't getting hot this time I think the thinking may be fried. So this is a 5114 chip? Any other common games have them? I have few Pacman and Galaga boards that are parts boards and maybe some others I might be able to steal the chip off of temporarily.
 
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Well Found part of the problem my -5V was not working right and I fixed that. But the game still isn't loading. Now A chip at location C1 is getting way to hot and to my surprise burnt the crap out of my finger when I touched it. TC5514Apl2 is the number on the chip the manual says its a 5114 static RAM? Once this started getting hot the game just shows lines and crap on the screen. Before I was getting a carpet pattern and error codes on the screen. I do have this hooked up to a switching power supply with a Jamma pinout. Maybe I shouldn't have messed with the volume knob that's when this started happening.

As Ken has stated, that is the CMOS RAM and if it burns your fingers it is BAD replace it.
 
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