Wms 550 critical memory error 10

[haman]

After doing a ram clear I replaced the game chip and power up the machine, critical memory error 10. I have already changed the battery and back plain board.error remains there.I put in a working cpu and io board and same thing happens.could it be that both backplain boards are faulty? I need some help?

[rickhunter]

Your XU3 game chip might be corrupt, have you tried another game?  I've had that error once and replacing the XU3 game prom fixed the issue.

[haman]

Do i need to change the game board alone or mpu and io board together. I have a working top banana . Could i switch the game board alone or does it need to be with the io board from that game.?

[rickhunter]

Just the game board needs to be switched (the 1.5 cpu board).  You could alternatively switch the eproms (the entire set, XU2-XU5 and XU17,18, 30 and 31) from one mpu to the other.

[haman]

So i  swapped the board for a working top banana. Got a (game mismatch - perform  ram clear)
After doing the ram clear i get the critacal memory error 10 again. What is the next step?

[rickhunter]

Do you have more than one cabinet?  There's no memory on the I/O board, so that would not generate that problem.  Have you checked the power supply for bulging caps?  It is strange that you have pretty much swapped all the parts that drive the software side and you still have the error.  Power is the only other thing I can think of.  If you have access to another cabinet, I would try your mpu's and I/O boards there to test for functionality.  The only thing on the backplane that has any storage is the eeprom used to backup gameplay data, but a bad one of those usually results in eeprom errors, not critical memory errors, which I have always associated with the game eproms, but since you already swapped it for another game set, I'm leaning toward something power related, it is about the only thing that is left.

[haman]

I put in a working wild streak and io board with a backplain board all from a working machine.and the game came up with set up printer and bv stacker missing so i put in a cash pan and did a ram clear so that i may be able to set up the printer after i replace the clear chip and start up again critical memory error 10. So now i am wondering if the clear chip could be the problem? I am using a multi denom clear that i bought on ebay.

[haman]

So i put the wild streak back in its original cabinet with the backplain and power it up. I got a "tilt memory clear"
Pressed the diagjostic switch and the game came up. So i the only thing causing the critical error in the other cabinet is the power supply or the harness.