Re: Rip Off - 2 questions

Unfortunately, there are about 50 things that can cause sound to completely fail...
- lack of +5V, +/- 28V on the sound board
- bad ribbon cable to CCPU board
- open lead wire to speaker or shorted speaker
- open volume pot / rheostat
- open connection in wiring harness to/from volume pot or speaker
- bad amplifier transistors or other electronic components on sound board
- bad sound data signal driver chip on CCPU
- bad input buffer or shift register chip on sound board
- bad chip sockets (open pins)
- and so on

Game reset may be caused by a lot of things as well, most likely flakey 2101/9101 static ram chip. There are 3 along bottom of CCPU board sitting together. They are 0.4" wide DIP-22. There may be a chip that is intermitently failing, maybe overheating, and causing the error. It could just be a bad chip socket or solder joint somewhere. Try reseating all socketed chips and see if that helps. Check the +5V supply on a few of the chips on CCPU. Maybe the supply needs a tweak.

William Boucher
http://www.biltronix.com
  ----- Original Message -----
  From: John Huie
  To: vectorlist@vectorlist.org
  Sent: Friday, December 02, 2011 12:22 AM
  Subject: VECTOR: Rip Off - 2 questions

        I posted this elsewhere as well but I've had such good luck with you guys that I have to ask here as well....

        I'm just starting to pour over the manuals and have a couple things I can check. But while I'm doing that I thought I'd ask the seasoned experts on where you would start. Two issues:

        1) There is absolutely no sound during game play.

        2) When I play a game, sometimes it will reset and instantly take me back to the attract screen right in the middle of the game. There's also often a graphics glitch about that time where one of the bad-guy ships doesn't look right...it's way to big.

        Thoughts?

        And thanks for helping be get the monitor working guys!

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Received on Fri Dec 2 19:18:45 2011