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(Topic ID: 55135)

TAF row gnd short

By Maddog

10 years ago

Topic Stats

9 posts
7 Pinsiders participating
Latest reply 10 years ago by Richard_BoK
Topic is favorited by 1 Pinsider

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Linked Games

Addams Family, The Bally, 1992

0

#1 10 years ago

Maddog

Pinside member

11y 24,900 108 11

My TAF on power up test results- row 4 gnd short, row 7 gnd short. I have checked connections, all seems good, all solenoids test good. Has anybody encountered this? Could it be u-18 & u-19 on Cpu board? Any help would be appreciated.

1

#2 10 years ago

Atomicboy

Inactive member

12y 81,150 7,318

Is there corrosion from the batteries into the ICs or traces below?

0

#3 10 years ago

Maddog

Pinside member

11y 24,900 108 11

no corrision board looks good

0

#4 10 years ago

robertmee

Pinside member

12y 82,800 6,430 15 9

Pull the switch matrix connectors and power up...does it report the same?

0

#5 10 years ago

Maddog

Pinside member

11y 24,900 108 11

Pulled switch matrix connectors and row 4 gnd short still there.

0

#6 10 years ago

Pacer

Pinside member

Indianapolis, IN

11y 35,400 262 8 32

Great... the row 4 problem is on the board then... row 7 is in the wiring!

0

#7 10 years ago

markmon

Inactive member

13y 98,300 13,010 21 81

Quoted from Pacer:
Great... the row 4 problem is on the board then... row 7 is in the wiring!

Row 4 is on the board. Row 7 may be on the board. Start by fixing the board. U18 and u19 are your row chips but I've even seen a bad u20 cause this. Any of those socketed? You may need help of someone that can fix boards or you can buy wpc CPU boards new.

0

#8 10 years ago

wellarmed

Pinside member

10y 57,400 972 55

ULN2803 should be changed.

0

#9 10 years ago

Richard_BoK

Inactive member

U20 often fails and results in these error messages.

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