Gorgar 98% working on last issue

Deadpool66

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With the help of members here I have been able to fix a broken score display and correct issues with the sound board new caps for the win ;-)

I'm having an issue where after around 30 minutes of play the the star insert lights up and glows but doesn't fully light along with a few other lights. Then scoring goes wild when ever a drop target or target is hit its basically counting way more points and multipliers than it should.
 
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use a schematic and trace down which bulbs they are and how they are powered
is where i would start
depending on that, is where'd i go next
 
Anyone know where I can get a Gorgar ring chart in pdf form or the like?
 
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Sounds like a heat related issue to me. Could possibly be your Lamp Matrix PIA IC. I've not followed the history of your other issues so you could have already addressed something like this.

This particular IC is responsible for your CPU controlled lamps, flashing them during attract mode and lighting them during game play. A common sign of a failing one is a REALLY bright lamp(s) or some that are dimly lit, lamps that strobe on/off but stay on all the time etc.

Of course it could also be the 7408's in the chain as well, but the give away (to me), is that the score display is affected. Does it actually award more points and the score displays stay stable, or do the score displays start throwing up all kinds of weird numbers? If its the latter, then I'd change the PIA and add a socket.

If you want to test your entire Lamp Matrix path then check out PinWiki for the step by step.
 
It awards more points but stays stable. The issue doesnt crop up until after a few games.
 
Replaced the 6821 IC's and the row of resistors and issue still persists. The Star, Number 2, and the upper left pop bumber all light up within a game or two and stay lit. I have 7408's but I'm not sure how to test the chips that are on the board to determine which one is bad.

At least the boards are being rebuilt even if the issue is still there. Next up PSU rebuild.
 
The problem is not the PIA, and rarely is; PIA's tend to fail as a whole rather than have an individual port go awry. Resistors only carry the lamp current, get hot, and sometimes open - and should be replaced with a higher wattage resistor as a preventative measure (5 W is typical; the factory units were 2 W).

Your issue is on Lamp Row 7, driver board pin 2J7-9. The circuit that controls the lamps in question are driven by transistors Q60 (2N6122), or Q61 (2N6427), or IC12 (a 7406). One of these items has failed, most likely the 6427, which is shorted.

If you are unable to correct this issue and require board service, I'd be happy to repair your board. Good luck!

Chris
 
Can anyone point me to where I can purchase these parts? Does radio shack carry a suitable replacement?
 
PM me, drop me your address, I will mail you all three parts and a socket. As long as you are adept at soldering you should have no problem. As I suggested, you'll want to replace the BIG transistor first. Are you able to identify where on the board these parts are at?

Chris
 
I can solder fairly well Ive been shotgunning parts onto the boards since I purchased the game. Ill have to pull up the diagram but I'm certain I can locate them on the board I'm guessing their the transistors next to the row of resistors I just replaced.
 
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