defender ram and reset

paul400

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just picked this defender up.its got a ram error and resets. after ram error it goes right to test mode. can anyone tell me how to get out of the test mode, its missing the coin door but most of the wires are marked. it doesnt really tell me what ram is bad, any input on that?
 
just picked this defender up.its got a ram error and resets. after ram error it goes right to test mode. can anyone tell me how to get out of the test mode, its missing the coin door but most of the wires are marked. it doesnt really tell me what ram is bad, any input on that?

I would just get a set (24) of new 4116 RAM and install 'em. For about $25 and maybe 15 minutes of time, you're done, and you have nice, new RAM to hopefully last a long time :).

You can of course use the manual to decipher the red LED lights on the board to try to determine which of the RAM itself may be bad, but again, is it worth the hassle? ;)

Jon
 
Williams 4116 RAM is infamous for causing game issues. My Defender needed several RAM's replaced. A Sinistar I picked up recently had a RAM error. I replaced the bad chip. It worked a week and then got a different RAM error. I have now replaced a 2nd RAM chip and it works just fine now.

As mentioned and what I should have done, is just order a complete new set of RAM chips and replacing them all instead of going at it one at a time as they fail.

Just as an FYI, the LED on the main board will cycle through 3 numbers. Match those in the manual and it will give you the row and column of the bad RAM.
 
thanks for the response guys, this is the first williams game i got. would bob roberts have the ram i need or someone else?
 
I think that Bob Roberts has these 4116 ram chips.

Jameco also has them:

http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_41339_-1

Also, if you haven't replaced the batteries on the PCB, do that as well. Sometimes bad batteries or a bad connection can cause odd problems as well.

Good luck!


Oh, by the way - Love the Avatar Paul! I can't wait for the Starblazers LIVE action movie this summer.
 
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