Re: Tempest repair problems

Forgot to mention, for the heck of it I took voltage readings on the two 3410 chips, all voltages were very close between the two DAC's except pins 5, on the Y DAC DC voltage of 3.68 compared to .22 on the X DAC, pin 5 of the Y DAC goes to LS194 pin 13 at F5 vector generator data shifter circuit. I don't know if this is any help at all.
Rich
  ----- Original Message -----
  From: Kevin Moore
  To: vectorlist@vectorlist.org
  Sent: Tuesday, January 03, 2012 7:46 PM
  Subject: Re: VECTOR: Tempest repair problems

  Be sure to check the size and linear pots for brken legs.

  On Jan 3, 2012 6:25 PM, "Rich Harkoff" <rharkoff1@new.rr.com> wrote:

    Thanks Matt good to know about the DAC. That's one of the chips I wanted to change since I see posts here & KLOV they fail a lot. My board has the 3410 chips and my local coinop guy actually has some. I thought I found the problem with that bad C13 but obviously not. I checked the voltages on the tls82 and found no AC voltage on pin 7 so that is another area that needs to be checked out more.
    Thanks again,
    Rich

      ----- Original Message -----
      From: matt
      To: vectorlist@vectorlist.org
      Sent: Tuesday, January 03, 2012 5:07 PM
      Subject: Re: VECTOR: Tempest repair problems

      i had this.. the dac 6012 was dead :(
        ----- Original Message -----
        From: Kevin Moore
        To: vectorlist@vectorlist.org
        Sent: Wednesday, January 04, 2012 10:16 AM
        Subject: Re: VECTOR: Tempest repair problems

        Well your y has no swing. So that's your problem area. Check ac volts on the tl082 outputs to start narrowing it down. Also check your -+ 15 volts

        On Jan 3, 2012 3:12 PM, "Rich Harkoff" <rharkoff1@new.rr.com> wrote:

          Hi Kev,
          With game in test mode X out has 3.7volts ac, Y out zero volts ac. Don't have a scope nor access to one.
          Thanks,
          Rich

          BTW, OT did you see the tongue-in-cheek article from "The Onion" on Cowboys releasing Jerry Jones?
          See here http://www.onionsportsnetwork.com/articles/dallas-cowboys-release-jerry-jones,2815/
            ----- Original Message -----
            From: Kevin Moore
            To: vectorlist@vectorlist.org
            Sent: Tuesday, January 03, 2012 2:19 PM
            Subject: Re: VECTOR: Tempest repair problems

            What are the AC voltages running on the X and Y output. Do you have a scope to put on the outputs?

            If you do, have a look at my page showing your wave forms with the diamond pattern in test.

            http://txvectorarcade.com/tiki-index.php?page=Tempest&no_bl=y

            Kevin

            On Tue, Jan 3, 2012 at 1:22 PM, Rich Harkoff <rharkoff1@new.rr.com> wrote:

              Hello and Happy New Year,

              Looking for any suggestions on a fix for a spare Tempest boardset. I got this and several other PCB’s for free from a local Op who was cleaning house, when I plugged it in my game there was no Y output, found that C13 was bad, replaced that and now I have voltage swings on both X&Y outputs. Someone replaced all the TLS082 chips and I verified that they are good. So here is where I'm at, 6100 fully functional, all voltages on PCB correct, goes into self test, no tones heard except the 4 decending tones, game plays blind as far as I can tell. Spot killer "on" and when I turned up brightness momentarily to override it, the screen just showed a small red dot in the center.

              Thanks in advance for any help.
              Rich

              Green Bay

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Received on Tue Jan 3 21:43:53 2012