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(Topic ID: 111841)

STTNG: None of cannon rotation switches register.

By creech927

5 years ago

Topic Stats

  • 3 posts
  • 3 Pinsiders participating
  • Latest reply 5 years ago by ChrisHibler
  • No one calls this topic a favorite


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#1 5 years ago


I've got a STTNG that has an issue. Neither the left gun mark, Left Gun Home, Right Gun Mark or right Gun Home switches register in test mode. I've gone into tests, set the guns rotated both so they're at about 45degree angles (as to get off all 4 switches) and put the game into Switch Edge mode.
With all 6 balls removed, The game shows the following:

Sw 24 - Closed
All of Column 3
All of Column 4
All of Column 6 except Switch 68 ( shooter)

When I attempt to click by hand any of cannon Mark or Home switches, nothing registers.

If I disconnect the violet/white wire at 8 driver board J5-1, nothing changes. Verified the purple/white wire at 0 ohms testing from J5-1 to the connector leading into the home and stop switches under the left cannon, where it terminates. (connection is solid)

If I disconnect the J209 from the CPU board, ALL the boxes in test mode clear except Column 2 row 4.

So it sounds like something is not registering the switch inputs from under the playfield for the violet/white column in the switch matrix. A visual inspection as well checking with a meter shows the purple wire isn't broken.

Now what's weird is I can take a wire and jump across the switches Middle and post and the non ring side of the diode on the switch and it will register 2 switch movements in rapid succession. (but activating the switch manually won't do anything) But it shows Switch 35/45, 36/46 on the right cannon and switch 37/47 and 32/42 on the left cannon. This tells me that the wiring in the game is capable of detecting those wires are getting signal back to the CPU, so I don't think this is a wiring issue.

This game was working fine last week, and has not been moved or stressed.

Any advise on what to check next?


Post edited by creech927: update

#2 5 years ago

The cannon switches are not in the switch edge test mode. Don't know why. Go into the cannon test menu and you can verify they are working. This messed with me for a while as well.

#3 5 years ago

Jwo nailed it.
It sounds like your game still is working correctly and there is nothing to be concerned about.
Chris Hibler - CARGPB #31 - The new place for pinball repair info

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