WMS 550 Ram Clear issue

[Tacman]

I have a couple   WMS  video cpu boards that  have the  "piggy back"  add ons to the PCBA slot  cpu.   The boards were pulled from working  WMS  550's.   I am  changing  the  games....(using the same number of eproms... XU2,3 17, 18, 30, 31  all  8 megs)   in the initial  Ram Clear  I get  a  "squeal"  and  2 bongs.     Clear screen /  pick the denom  shows up... but no  "click" sound when picking  denom etc...   Pull out the Ram Clear chip.... put in the  XU2....  Restart  gives me,  again,   2 bongs...   I can  go to configure...set that up... and  will go into game.... However...    I'm getting only partial sounds and  the  "game play"   is  slow and has  delayed and erratic  action and erratic sound.   Re-checked  eproms / checksum...   all  OK.  I have also tried to put the original  game eproms back in the machine and it cleared properly...   I came across  another  WMS  that had the "piggy back"  boards  4 months ago...and could change out the games with no problems...  I'm also not having any problem  changing games  with the 1.5+  CPU's.

Any ideas ? ?    Thanks. cp

 Â« Reply #1 on: 01-06-2010, 18:03:05 »
Check your jumper by the sound chips, position JP3.   I'm thinking your old game sound chips may have been 4 megs.  There are a few game titles for the 550 that do have 4 meg sound chips
Pokernut
 Â« Reply #6 on: 01-06-2010, 20:23:26 »
According to WMS manual- 2 startup bongs= Bad XU-30 on CPU board. Remedy= Replace with good XU-30, Clear Ram and retest game. Also verify sound jumpers for correct eprom size.

 Dan (tacman)
« Reply #7 on: 02-06-2010, 02:24:18 »
Chris, look underneath the Video Adapter (where the monitor cable plugs in) there are either 2 or 4 surface mount ram chips on that board, if 2 that is your problem, if 4 then forget what I said, you can see it without removing, older games like Mon 2 Burn and Who Dunnit don't need much, but the newer games won't work, I see everybody selling any WMS board they can dig out now, but many won't work, they were Poker or early Slot games, I can take some pics and show you if you need me to.
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