I have a Whirlwind that started acting up, due to switches registering wrong. And the most annoying part is that the machine is being picked up by a buyer in 3 hours... Tha machine have always been working perfectly up until now.

I have included an image that shows the problem. But in short, when i trigger switches from row 8, another (wrong) switch from row 8 triggers instead. IE triggering right outlane (switch 16) with my finger, shows Inner loop (switch 40) registering in the display.

If i disconnect the switch cables from the CPU board, and jumper the pins instead, everything is registering correctly.

Hoping someone has a an idea where to look?

pasted_image (resized).png

#3 2 years ago

MIK

Phantasize

Pinside member

Randers

8y 44,050 481 14

Turned out it was SR11. A 560 Ohm networked resistor array. One of the internal resistors (the one on row 8 ) was faulty. Added a new single 560 Ohm resistor for row 8, and everything is now working again.

Post last edited 2 years ago.

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