Game plan Sharpshooter voltage issues


By thebman80

5 months ago


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  • Latest reply 5 months ago by Quench
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#1 5 months ago

I have tried for the life of me to get the 5v right in this game. Its reading around 9.3v I have replaced basically everything in the 5v circuit on the power supply and it changed nothing. Well I shouldn't say that the volts went up from like 8.3v to 9.3v. So I'm totally at a loss unless something was wired incorrectly on the 5v regulator by the guy before me. Because I basically put the new regulator on and just soldered the wires on it like they were. Here is a few pictures the power supply I believe is out of a sharpshooter 2 this is how I got the game.

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#2 5 months ago

It looks to me like the previous owner got the input and output pins on the regulator crossed over. Your replacement might be fried now too.
The pins will be closer to one end of the regulator, see the pinout diagram below: Compare it to how yours is mounted and trace the wires to confirm.
Probably an idea to replace the diode too and orient the banded side of the diode with the violet/red wire (input of the regulator).

LM323_Pinout.jpg

SharpShooter_Reg.jpg

#3 5 months ago

Thank you! Luckily I have like 3 or 4 more of them I thought ahead and bought a few spares. Yeah I wired it exactly like it was so this was no fault on my end maybe now I can get this thing booting again. Assuming half the CPU wasn't cooked, even though there aren't that many chips to worry about see we will see what happens.

#4 5 months ago

BTW, is the big blue capacitor wired properly? Negative lead to ground? Hard to tell from the picture.

There's another Game Plan Sharp Shooter thread going on at the moment and you can see a picture of the regulator wired opposite to yours:
https://pinside.com/pinball/forum/topic/gameplan-sharpshooter-boots-halfway#post-3606140

#5 5 months ago

Yeah that should be good I will double check but I'm fairly sure its correct.

#6 5 months ago

Yeah 5v works again finally! Thanks! Game CPU boots and relay clicks. I can coin it up and some of the attract lights blink flippers work. score displays are a little weird keep blinking back and fourth. Garbage and 0'z and some times 10 points is displayed on the credits randomly.

#7 5 months ago

And now the CPU is dead again...

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#8 5 months ago

How are the voltages on the MPU board looking? Are any of the ICs on the MPU board hot to touch from any previous over voltage cooking them?

#9 5 months ago

Yeah 74ls123 in the lower right corner of the CPU cooked I removed it and replaced it with an unknown off another parts board. If I probe with my meter around that area the board was sometimes blinking once. Then all of a sudden it started blinking once every time I tunded it on after that. I'm thinking the LM339 next to it might be bad as well but I don't have any.

#10 5 months ago

Page 18 of the manual points to 1 flash component diagnostics: "CTC2 Procedure"

Are you getting any pulsing on pin 21 of U10?

The LM339 can work on a supply rail up to 36 volts. There's probably a good chance the power-supply issue didn't affect it.

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