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   comp.sys.tandy      Life is dandy cuz you're gettin a Tandy!      5,684 messages   

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   Message 5,443 of 5,684   
   David Jones to All   
   Re: TRS-80 Model 4 Keyboard repair   
   27 Nov 16 12:59:45   
   
   From: djones60@gmail.com   
      
   Well I got the keyboard working.  Below is what I did in case someone else   
   runs into this problem   
      
   Took a X-acto knife and very carefully cut away the plastic over the trace   
   that need to be repaired.  I did it as close to the damage as possible and it   
   also too some scrapping to expose the traces. It really helps if you have a   
   hands free magnifying    
   glass.   
      
   Then I cut a piece of 30 gauge wire to fit, stripped the ends, then spot glued   
   it down with super glue just short of the stripped part.   
      
   Once things were glued down so it wouldn't move around, I used some "Silver   
   Conductive Paste Glue Wire Adhesive Paint PCB Repair For LCD 0.3ML USA" I got   
   from ebay to make the connection from the original trace to the wire.   
      
   After this had dried and set, I tested the continuity. If it didn't take,   
   rinse and repeat.   
      
   With the traces repair and tested, I then covered that section with thin   
   cardboard pieces taped together.  This was to keep it from flexing and popping   
   the connections lose.   
      
   The only other problem I ran into was some cross talk once I tried it live in   
   the computer.  This showed up as if all the buttons on the repaired line were   
   pressed.  Turns out this was caused by the bracket that covers the cable as it   
   enters the    
   motherboard cage.  To fix that, I put a piece of thin cardboard between the   
   cable and the bracket.  Not sure why it only showed up on the repaired line   
   but its all happy now.   
      
   Well I discovered two other problems with the computer.  One was the focus pot   
   on the video board was arcing.  The other was the original floppy drives.  The   
   head rails need to be cleaned and lubed.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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