Quoted from jonnyinGB:Hi.
New to this, I have a 1980 SI with a mpu remote battery memory type(as opposed to on board battery). The machine is in an un-played state since being delivered to the uk, on assumption. I assume this because there is no trace of playlines (have looked through magnifying glass & nothing). When I turn the machine on backbox,coin shoot (x2), playfield lights (top bumpers x4). To date I have done numerous repairs/maintanence. Still can't get past this or even to the seven self diagnostic tests, yes the green light is locked on. Had the machine almost two tears now with no play, I can't tell you how frustrating it is.
I have started cross-checking the my wiring harness against Downloaded schematics. The first connector I check has a discrepancy, oh bugger. This is well out of my depth.
Does anyone have any idea's where I go from here?
Thanks In Advance
Jon Beardsley ,U.K.
Jon,
To rule out a wire harness issue with booting the MPU you can attempt to boot on the bench.
https://www.pinwiki.com/wiki/index.php?title=Bally/Stern#How_to_make_a_Benchtop_power_supply_for_the_MPU_board
I suspect though that the locked on LED is as stated by @vid1900. There are other sections in the Pinwiki to assist. Hang in there. The group will help.
Li, NY
