Results 1 to 1 of 1

Thread: Taito L-Shaped PCB Repair Log (Sound PCB) Graphics Glitch

  1. #1
    Join Date
    Jun 2008
    State
    Brisbane, QLD
    Posts
    2,583
    Mentioned
    252 Post(s)
    Quoted
    502 Post(s)

    Taito L-Shaped PCB Repair Log (Sound PCB) Graphics Glitch

    I had a faulty sound PCB which after socketing and replacing the LM3900's and the 7417's, I got all the sounds working but the sound PCB also had a graphics glitch.



    There were lines through the invaders, their shape was wrong and they would charge straight to the bottom of the screen after a couple of changes of direction and the game would reset.

    After probing the outputs of the 74151s I found IC [3] had it's output stuck low on pin 5.



    After changing it the was some improvement, the invaders were no longer blocky/wrong shape.



    Looking at the inputs of this bank of chips I found DS8 was stuck low, the input was coming from the 74175 at IC [12], pin 2.



    After replacing it the graphics glitch is now gone and the game plays normally.


    @lentildude
    Last edited by Kaizen; 23rd May 2019 at 11:09 PM.
    Namco Starblade - Taito Cocktail 14" x 3, 20" x 2 - NZ SI PtII Upright - Chase HQ DX, Taito Top Speed - Taito Grand Champion - Taito Safari - LAI SI Head to Head Cocktail - SI Cocktail Clone x 2, Pong Clone x 3

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Taito L-Shaped PCB Repair Log
    By Kaizen in forum PCB and Monitor Repair logs
    Replies: 1
    Last Post: 12th May 2019, 08:11 AM
  2. Taito Space Invaders L shaped Taito upright
    By tevo in forum Arcade Technical and Repair Questions
    Replies: 12
    Last Post: 19th February 2019, 04:17 PM
  3. Braze kit for Taito L Shaped.
    By aaablettt in forum Arcade
    Replies: 1
    Last Post: 18th February 2016, 10:47 PM
  4. Taito L shaped shorting
    By aaablettt in forum Arcade Technical and Repair Questions
    Replies: 7
    Last Post: 26th August 2013, 08:02 PM
  5. Replies: 1
    Last Post: 30th March 2012, 07:01 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •