T2 Pinball Ground shorts

msj

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Hope someone can help..going NUTS!! I was swapping some bulbs out on my T2 pin. When I turned it on it said check fuses 114 & 115. 114 was blown and I replaced. I then got a ground short error. I swapped all the led back to stock bulbs and am still getting ground shorts on rows 2, 4 , & 7..also gun cant find home . Any help would be great as I am pulling my hair out
 
Unplug the switch column and row, (strobe and return ) lines from the CPU board, see if the shorts are still there.
Usually when that pops up it turns out to be an BA339 IC U16,17,18,or 19... probally 18 and 19...
and check the caps and diods on the input lines
but not always... good luck

BTW you can use a diode and jumper to test all the row to column switches with the playfield conectors disconected
 
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I unplugged the rows and the ground short errors dissappeared but the "gun cannot find home" is still there. ??? What now?

BTW, Thanks for the help
 
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While in single switch test mode you need to use a jumper wire and a diode to test all the inputs from row to column.
Pull the connectors off and connect a jumper lead from J206 pin1 to the band end of a diode and touch the other end of the diode to pins 1-8 of J208 one at a time and check for a switch reading , Then move the jumper to J206 pin 2 and repeat. test all pins of J206 one at a time against all pins of J208 one at a time. See if your shorts show up. Hopefully they won't!

Have you cleaned the optics for the gun?
 
Thanks Again, you've been very helpful- i am going back in...rrrrrrrrrrrr. i am thinking of just kickin the s%!t out of it, but gotta watch my blood pressure
 
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