Pinball some switches non-op; can I jumper?

Thread Starter

robismod

Joined Sep 22, 2015
134
My 1978 Brunswick Alive home model pinball machine...new issue...
Working on a new problem on my game...my “DUD” board I purchased seems to be working almost perfectly, except for one row of switches, S10, S21, S4, S1, S13 (from the matrix) not scoring.
From the board connector I have continuity on all wires leading through the switches.
(Note: Still no schematic has been discovered for the main board.)
On the game schematic, board edge connector CR-2, pins 15 and 19 are designated for these switches, labeled as Return 3, green wire, pin 15. And Strobe 3, black wire, pin 19.
Help1: My old brain is fading again, and I can’t figure out how to use my meter to check the two pins on the board edge connector.
Help2: since this is just a home hobby game and don’t need it to play exactly, could I jumper each non-working switch over to a similar working one?
Thanks again,
Tim
 

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Thread Starter

robismod

Joined Sep 22, 2015
134
Put the meter on Ohms with beep or Diode mode to check continuity on pin15 wires.
I did put the meter in Continuity mode with audible signal, one lead at pin 15 on connector and other lead on switch contact at far end of the string and test showed good. Is that what you mean?
I went ahead last night and pulled off the wiring from the affected switches, and then added new wires to them, soldering over onto a related switch. (Since all but two of these were right side targets, I just tapped them over to the left side function. One in the middle was for a pop bumper, and I picked out a nearby switch that was the same point value—other one was a single alley/roll over at the very top for 1000 pts. but no other 1000 pointers. So I used another lower value switch.)
So far, everything is running just fine now. Not exactly the correct point totals but that’s not a big deal. I don’t think any family members here are critical enough to monitor individual target scoring ...
Still, I’d like to try and figure out what is wrong with the original configuration. Since there’s no schematic for the board...my jackleg “skills” had me look at where the edge pins go to on the board...in this case the first item is about a 16 leg IC...I’ll get a number off it and look up and see what it’s all about...
 
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