Hi Dean,
I must have the same manual as you for Mata Hari...
What is the problem you are having with the switch matrix? I may be able to help.
Currently all switches in 1 row wont operate. These are those connected to Pin 15 of J2. The MPU switch test shows switch 08 as shorted (outhole switch). By this I mean all player dispalays show a 08. Manual shows 08 as outhole switch.
Question on the Stern MPU the switch test numbers are shown in the ball/credit display is it different on the early Bally's as the 08 appears in the player displays?
I believe at this stage it may be an MPU problem as if you put the machine in switch test mode and then remove plugs J2 & J3 it still shows the 08.
PIA's are both Ok as is the resistor and capacitor connected to this pin 15 of J2.
Any ideas, I hope to have a better look latter this afternoon when this bloddy heat cools a little.
Cheers Dean
Bally pinballs do show the switch numbers on all the player displays.
CR11 is a definite possibility, as is R69 and C40 - connected to J3 pin 16.
Did you swap the PIA's to test them?
