Hi widget2k4
I show a snippet of schematics of the TWO-Player-pin --- Your pin has (probably) the same logic --- but for (1,2) (3) 4 Players. I see a possibility "brown, upper part in the JPG" to cause the faulty pulling - and I see a possibility "blue, lower part" to cause the fault. For both I must think-in an additional fault to make happen what You have in Your pin.
"Blue": The "Self-Hold-Switch*** on the K-10'000-Relay" is faulty always closed (and additional: The Coil on the 10'000-Score-Drum does not fire).
"Brown": On the 1000s-Score-Drums there is a plunger moved (to then make the drum to turn) --- at end of travel the plunger opens a switch (brown-1) - also closes a switch (brown-2). IF (if, if) two studs / solder-lugs on these two switches (on any of the Score-Drums) faulty touch: You have faulty connection along "brown lines" (and additional: The Score-Drum is in 9th position and/or the 9th-pos-switch is faulty).
Want to try on "blue" - locate the plunger on one of the 10'000-Score-Drums and the End-of-Stroke-Switch (blue-1) that shall open when the coil on the drum fires --- sneak-in a stripe of paper in-between the contact-points to make the switch permanently open.
Want to try on "blue" - inspect the "Self-Hold-Switch*** on the K-10'000-Relay" - have the pin toggled off so the relay is not pulling - is this switch truely open ? (contact-points, drop of solder, doghair crap of wire, a stud bent and so the solder-lugs touch ?)
The "Self-Hold-Switch*** on the K-10'000-Relay" is easy to find: From one side of the coil runs a short wire to "Switch mounted on the relay" - THIS switch is the Self-Hold-Switch***.
Want to try on "brown" - Inspect all the End-of-Stroke-Switches on the 1000s-Score-Drums for "touching studs / solder-lugs" (brown-1, brown-2). (But to brown: problem 9th-pos-switch).
The written above is "searching the cause of the problem" --- it is not "fixing the problem". Greetings Rolf
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