Just a quick one because I think I'm being a bit dopey! Somebody at some stage unplugged the knocker on my JM but for the life of me I cannot see where it is supposed to plug back in. Anybody got any ideas? 
Pinball info
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JM Knocker
- Thread starter Sam C
- Start date
manual says power driver board ..... J107 pin 2 (red/brn +50) and j130 pin 8
Rob
Rob
OP
OP
Ta matey, will give that a look tomorrow and see what is up
OP
OP
All fixed, simple as somebody had hidden the wire behind a whole load of other wires out of sight! Traced it from the plug you said it should be and all plugged back on and working again now (You can probably see it in the first picture actually, teach me to use my eyes next time!!!)
(You can probably see it in the first picture actually, teach me to use my eyes next time!!!)It may never have been connected before, since uk-spec* WMS games at that time were supplied with a coin meter connected instead of the knocker. I've always felt that pinball isn't right without a knocker (though a few early solid-state games were built totally without one), so while preparing machines for their first site I'd connect the knocker and remove the meter, along with its leads running from the cabinet to a 2-pin connector which mated with the plug your game had tucked away.
It's good that the knocker is working as intended; if the pricing scheme still had it configured for a meter it wouldn't appear in the solenoid test or operate for a replay award, but would knock when coin inputs were registered.
* the 2nd & 3rd digits of the 'plastic' serial number label indicate the territory the game was intended for; if those are the games' original Cpu/Fliptronic boards, the #10## ###### labels show it's uk production. I think '07' was France, and I'm sure '13' was Holland.
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OP
OP
Another little titbit of information I never knew. It does appear in the solenoid test (quite clearly said 'KNOCKER' rather than coin meter or anything else) which was how I was able to verify it worked but I haven't played enough games yet to hear it work for a replay but I know for a fact it works. I will have a look at the serial next time I'm at the back of the game, would be interesting to know!
There should be another serial number label inside the cabinet, on the right. I think that by then the label even stated the date of production (for reference with any service bulletins) and the type of coin door originally fitted, e.g. 'UK ECA' (Electronic Coin Acceptor).
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Stern are the worst with that god awful electronic sounding knocker!!!! Rather have no knocker than the electronic one stern do!
