Your schematic shows that once BB fires, it holds itself on until:
- The O (Ball Return?) relay fires or
- The E (no idea) relay switch and the motor 4C switch both open at the same time.

If those three switches all seem to be doing the right thing, also check that the two Rollover switches open once they've been closed.

Maybe the easiest thing to do would be to fire the BB relay and then manually open all five switches (one at at time) to see which one lets the BB relay release.

/Mark

Looking at schematic the curcuit is de-energized when a switch on O is made at the end of each ball.

FYI:

Screen Shot 2018-04-03 at 7.30.54 AM (resized).png
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I had this problem with mine. It seems like there's a short period of time where it cuts the power and if it doesn't drop in that time it will get reenergized. There's a switch that's triggered when it's open that holds the power.

Mine was the return spring on the gate. It could also be the switch itself I suppose.

If you cut power to the machine, does the gate close?

Hi mrbanjo
You write in post-1 "Gate on the right does function means closes when used". I have a question --- when You open the gate on the right - then You loose the ball between the flipper-bats (Gate on the right is open) --- the new ball is kicked over to the Shooter-Alley - as the ball rolls into the Shooter-Alley - question: Is the Gate on the right STILL OPEN --- and then You launch the ball - ball rolls upwards - and now the Gate on the right closes ? Greetings Rolf

The BB is energized thru the rollover switches. A NC switch on 4c and a NC switch on E make a circuit thru a NC switch on O. A NO switch on BB holds the circuit open until the O (outhole) energizes and breaks the circuit.

Hi mrbanjo
the pinsiders helping are on the problem --- You have two faults. "brown" is the Gate on the right --- the brown-4a is working - but not the BROWN-4B. Thats why the lemon-green-4 does not make the "Ball-Return on the left" to close when You loose the ball not using the Ball-Return on the left.

When You USE the Ball-Return on the left (dark-green) - then dark-green-4 and/or darkgreen-5 do not open. ("blue" is the activating of the E-Relay) Greetings Rolf

0Wild-Live-Work-09 (resized).jpg

A switch on O releases the gate circuit. 2 contacts are NC. If they do not open when O is energized (ball in outhole) the gate will not open when next ball is served. If the playfield switches are adjusted in a closed state the gate will stay opened.