The problem with alarm, is with this sensor on the plastic ramp, i found that sometimes with 5 DM it's not working good, coin stuck because ramp is not straight 100% and 5 DM are bigger than other so it's sometimes little dificult. With 10 pf, 1,2 DM no problem.
I must find "new" ramp. I tried to glue the plastic but one small part is missing.
Can you show a picture?
I uploaded on Youtube a video of the start button wich don't want half shine, I changed the bulb and it's same (used the bulb from risk button, the bulb in risk button half shine, so the problem is not with bulb). Any chance to repair it ?
Well, it's not a big error. Repair is possible, but might need to change a chip (IC) on the board. An expert would need to check the main board (Steuereinheit / "weiße CPU"). However, to be sure you could first check if something is wrong with the microswitch. Try exchanging with a another mount and switch e.g., from one of the risk buttons.
My diagnostic with the small bar wich block the coin comparator wasn't correct. The bar and magnes work fine. The problem is that whem its more than 30 DM inside the machine for the game, it's impossible to add some coins, and they are all returned. If i move the bar, the coins are accepted but not credited. Is it normal working process that i can't throw more than 30 DM?
Yes, it's normal that you cannot add more money when 30 DM is reached. However, the limit can be programmed with a special console.
And bonus question, is it possible to install a switch for proper off and on the machine? Without plug it / unplus (or without use the button on a multi socket), for preserve the electronic?
Sure, that's possible. The most easyist solution is with a single switch (like this) directly between plug and wall socket. Some people also solder a switch (like this) into the power cable.