(Topic ID: 330006)

System 6 row 7 switch matrix. Firepower

By iamdrunker

2 days ago



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  • 5 posts
  • 4 Pinsiders participating
  • Latest reply 2 days ago by PINTEC
  • No one calls this topic a favorite

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Row 7.pdf (PDF preview)

#1 2 days ago

Hello All. I lost everything on row 7 and only row 7, including 55 that is not used. Do I start replacing diodes on that row? I've been looking for other post of the same issue only to see that I might need a probe to find the problem. Maybe a link to other post that corrected the problem? Thanks, and have a great evening.
Mike.

Row 7.pdf

#2 2 days ago

First narrow it down to board issue or playfield issue. No probe needed.

https://www.pinwiki.com/wiki/index.php/Williams_System_3_-_7#Testing_the_Switch_Matrix

#3 2 days ago
Quoted from phishrace:

First narrow it down to board issue or playfield issue. No probe needed.
https://www.pinwiki.com/wiki/index.php/Williams_System_3_-_7#Testing_the_Switch_Matrix

Will do. Thanks.

#4 2 days ago

Trace white/violet wire from 2P3 connector on driver board to check for open. Possible cold solder on driver board on pin 3 on 2P3 connector.

#5 2 days ago

Re seat the switch connectors at the driver board.

No?

Move WHT -VIO output to another known working row output pin.

Does the switches on playfield in row 7 now activate the row selected?

yes?

Driverboard row switch output failure.

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