High Speed
Williams, 1986You're currently viewing posts by Pinsider pinflip_.
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I would also recommend installing nvram.
When it is installing I would recommend desoldering the battery holder as well socketing u25 when you replace the old volatile ram with the nvram. If you want to install it yourself, I got mine from barakandl and have no complaints with it.
This is if you feel comfortable with soldering. Do it at your own risk!
This sounds like a battery/RAM error.
Quoted from jb343:Batteries are replaced and fresh.
Since you replaced the batteries I would check to see if the battery holder is still good. With a multimeter measure the bottom right and top left terminals of the battery holder.
If there is voltage, turn on the machine and see what number is displayed on the seven segment display. System 11 Diagnoistics (resized).jpg
If you want to do the memory chip test it is the pushbutton that is labeled CPU on the left side of the board.
To me it sounds like you most likely have a faulty RAM. See if U25 is socketed. If the RAM ever failed before it most likely will be.
Personally if you are replacing the RAM I would strongly recommend going with NVRAM so you no longer have to worry about those pesky batteries ever going bad (possibly creating real issues if batteries leak causing alkaline damage).
Quoted from YeOldPinPlayer:When pinball shows start again you can take your board to one and have NVRAM installed. borygard puts up his schedule at lockwhenlit.com.
Quoted from pinflip_:If you want to install it yourself, I got mine from barakandl and have no complaints with it.
I've heard good things about both people of them when it comes to their NVRAM.
You may want other pinsiders to chime in on this to make sure that what you discribed sounds like a RAM issue. I would hate for you to replace the RAM and nothing is wrong with it unless you want to upgrade to NVRAM.
I hope this helps you getting your High Speed up and running!
Quoted from jb343:status update:
remote holder installed.
voltage at pin 24 of U25 is 4.45v (ok?)
set to free play
turn off, turn on, settings are still there. Does this mean the RAM is ok?
When I press the CPU test button an '8' displays for a moment, after a second or so there is a beep and it goes to 'zero'. 'zero' is displayed all the time and when I turn it on.
But, start a game button is not working.
Thanks for all the ideas and help.
JB
and the attract sounds are working!
Your RAM is ok. The 8 then the beep followed by the 0 is normal.
Now to the issue of the start button.
First, check the gap between the blades. The gap on my start button between the blades is approximately 1/8".
An easy way to make sure the button works, providing that the switch blades are touching when you hit the start button is to to put the game in test mode. You want to go to the switch edges test and press the start button. The top two displays should display Credit Button .
If the switch blades are touching when the start button is pressed, it could be the diode on the switch.
Is the start button the only switch you are having a problem with?
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Orange, CA
Dunakeszi