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Midway (Williams) Y unit (Z unit and T unit) Discussion, Serial Numbers etc

Hi Folks
I have one Mortal Kombat and WWF Wrestlemania cabinets, when i bought the 2 are not working, and my tech repair the MK with some WWF parts, now after many attempts he cant repair the sound of this PCB, can anyone help me to repair this board ?

Many thanks in advance
 
Overkilll said:
Hi Folks
I have one Mortal Kombat and WWF Wrestlemania cabinets, when i bought the 2 are not working, and my tech repair the MK with some WWF parts, now after many attempts he cant repair the sound of this PCB, can anyone help me to repair this board ?

Many thanks in advance
Click to expand...
your location says Lisbon, is that WI?

also which sound is not working?
 
Overkilll said:
HI
Lisbon, Portugal Is WWF sound not working
Click to expand...
there's like a PAL chip the sound needs, towards the middle of the board. I want to say it's U1 but don't quote me lol if you have another Wolf unit game you can try swapping that chip. my MK3 board began life as a UMK3 and had no sound... the other parts board I got with it I robbed that chip from to fix it. there may be a video on this channel about the sound https://www.youtube.com/@YourMKArcadeSource

also the sound roms U2-5 all have to have proper code. if the rom labels fell off a long time ago just mere exposure to ambient light vs. an EPROM eraser is enough to wreck the data. hope this is helpful for you to start with.
 
3 and half years later.... After alot of work and new tools i've got a version of NARCY running, achieving my original goal mentioned at the start of this thread :) :). Yes narc in std res (15khz) on Y-Unit hardware. And yes i also ported the sound system to use the 6809/oki sound board thats used with t2 and others. The OKI chip take the place of the full 2nd (slave) sound board

If you want to try out the new roms on a real y-unit board then get in touch :)

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