Arcade Collecting > Restorations & repair

What's my first step? Sinistar - not working

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geocab:
OK, quick questions:  would it be in my best interest to replace the caps on the sound boards like I did with the power supply?  Also, I didn't replace the 18,000 mfd capacitor because I couldn't find one, is this a possible reason for the intermittent sound?  (I think I just found one, probably going to order it.)
I'm definitely going to check the pot first, but I wanted to ask a couple of questions about some more possibilites.

Here's a better description of the sound issue:  After repairing the PS, the game started up with no sound.   One instance when the sound came up, I was able to her "I hunger!" when inserting credits, however, every other time the sound worked, the speech has not.  So, I can stand and play the game, every now and then the sound comes on and I can hear the shooting and explosions, but when the Sinistar comes to life, all sound goes out again. 

SirPeale, I'm assuming you mean the sound pot on the daughter board?  Not the pot that is separate and mounted by the coin door access for the speaker volume?  Just want to be sure which to check and replace. 

Also, when the daughter board is disconnected, and the separate pot is turned all the way up, the sound of the game is barely audible, but constant (sans the speech of course).   Would this indicate that the problem is probably something on the daughter board, or could the problem still be on either sound board?

Oh, and totally unrelated to the sound issue, as I mentioned, my monitor has some Q-bert burned into it, is replacing the monitor the only way to correct this? 

Thanks for the help, guys, it's nice to be almost up and running.

SirPeale:
I'm not 100% familiar with Sinistar, but on the other Williams classics I've worked on there's been a pot that's harnessed to the sound board.  That's the one I was talking about.

geocab:
Here's both the pot on the daughterboard, and the harnessed one. 


     

SirPeale:
The second one is definitely the main sound pot, and the one I was referring to.  Check that out, as well as the connection.

The other appears to be the speech board, but I could be wrong.  I've never worked on a Sinistar before.

geocab:
Yep, that's the speech board, I wonder if that pot is strictly for speech though.

Will definitely thoroughly check out the harnessed one and will post my findings when I do.  :)

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