Wms 550 upright - game change/clear chip problem

[teamclark4]

Wondering if someone has some other ideas.  I have the manual and other documentation but it's not helping.

1) Have a jackpot party upright - wms 550
2) Pulled mpu board
3) replaced chip xu3 with the clear chip
4) put mpu board back in
5) turned on machine
6) chose "coin denomination" option on screen and did .01
7) Got the memory cleared or whatever the final message is when it's done
8) took mpu board back out
9) pulled xu2, xu3, xu30, xu31, xu17, xu18 and replaced with the appropriate "reel em in" eproms.
10) put mpu board back into machine
11) turned back on and got the solid "8" on the mpu board, nothing on display
12) rechecked seating of eproms and made sure mpu board was fully pushed in
13) still got solid "8"
14) decided to outsmart machine and put back in all original Jackpot party eproms i had pulled (expecting it to at least come back to what it was)
15) still go solid "8" with original eproms back in
16) put back in clear chip in xu3; so board is setup exactly like step 3 above
17) still getting solid 8 on mpu board

Am i missing something here ?  i would have thought that no matter what the clear chip should override all other chips in getting me to the clear chip menu; even if the other chips were somehow damaged. No bent pins etc.....

Manual says solid "8" is bad xu2 or xu3 or bad MPU board (when it was fine an hour ago when i started all this ?).

Any insight would be helpful.

thanks.

[cfh]

The most common cause of something like this is a bent
leg on one of the eproms, or an eprom installed "backwards".
it's so easy to do. even people that do this all the time
will occassionally bend a leg or install a chip backwards.
i would double check that.

also make sure that reel em in is the same size chips as
jackpot party. some of the newer 550 games use bigger
EPROMs, and jumpers need to be changed.
(though i don't think this is an issue in this case.)

[teamclark4]

Thanks for the feedback..

I checked all the eprom legs and they are all in their own socket solidly.  I have actually put then in and out probably 3 or 4 times now.  I also matched the "notch" on the eprom with the notch on the board; and for safety sake took a picture of the board before i messed with anything; so i have double checked in the picture how they were pointing too.

Even if reel em in was a different size eprom; i would think that now that i have it all set back to jackpot party it should go back to working.

My final option is to get a replacement game eprom; maybe i killed one of the jackport party eproms in handling them; and maybe the reel em in eproms have their own problems ?

This is driving me nuts since i felt like i was being really careful; though i hadn't actually done a game change before..

[kenokarz]

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