T15 -RLT.jpg

with this test you can see the state of both switches

Try this.
Use the cannon test to turn the cannon to about half way.
Leave cannon test so that it stays in that position.
Now go into coil test.
See if the cannon will fire.

We are ruling out a flaky wire harness to the cannon.
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Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWik.com - The Place to go for Pinball Repar Info

The cannon does not know what position it is in. At home position in your right cannon test it should say both switches closed - closed. The ball should not be able to be shot in that position if the cannon opto switch is reading "open" with the ball in position.
As you press the red test mode button the cannon turns and first the home switch should open and then the mark switch should open. As the cannon returns to its home position the switches close in reverse order.
There are two switches under the cannon. Lift up the playfield and check if they are in their proper position and the micro switch arms are not broken/bend or dislodged. If they are not then most likely one of the switches is faulty. Also make sure wiring to the switches is not damaged and the switch diode is not broken at the solder point.
Once all this checks out then check cannon wires.