My NIP-IT works great except this that I don't understand completely.

I can start a game from the start button when I have credits, the credit reel counts down then.
I cannot start a game from the start button when I don't have credits.
I get a credit awarded when reaching a replay level (50.000)
When I trigger the coin door switch for coin slot 1, it starts and resets the game. Additional 'coins' add player 2, 3 and 4 to the game.
I have no other coin door slots, it's a coin door with 1 slot in the left position.

What doesn't work or I don't understand.
Mach feature is on and 00-90 unit works (I see the match feature lights at end of ball) but doesn't award me credits when it matches?
I cannot add credits to the machine.

Should I use coin slot 2 or 3 to add credits or is this a jumper setting?
I would want the coin slot to add credits and the start button to start a game.
I do not want the game to start when adding a coin..

It's not jumpered of stuck closed.

I read some more and found that's probably the way the game works if it is set to 1 coin 1 play.
If you change it to 1 coin 2 credits, then it doesn't start automatic but adds credits instead.

But this means then that you cannot configure it that you get 1 credit for a coin on the credit reel instead of starting a game automatically I guess?

Somebody any tips on the match?

Unfortunately it is already enabled.. otherwise I wouldn't have the match ligths either I think.

Ok I'm not going to jumper the game for credits, was just curious if I could get it to work more like modern games.

Tx for the picture! Ok I understand most of it now.

I'll check everything in the circuit
I have 2 nip its next to each other, so I can compare

Success!

I adjusted the plugs at the front door.. My left (and only) coin entry now gives 5 credits (adjustable from 2 to 5).
Adding only 1 credit instead of a game start doesn't seem possible.

And I have match! I've now had them already on player 2, 3, and 4 (on nrs 50 - 70 and 20). Adding credits, launching the knocker, ...
Only thing I did was cleaning the match settings plug and the coin unit wipers. The one that determins how many players are coined up.

Only a few days ago I replaced the 00-90 unit coil (it had melted completely, probably due to an earlier closed 10 point switch). So that unit was operating just recently again.
Maybe I had some bad /dirty contacts overthere too.. that cleaned themselves by playing the game.

Thank you all for helping out.