Mata Hari
Bally, 1978So I jumped power to ever coil and all worked except 2.
The coil in the coin door
The coil in the third chime (back row and closest to the middle)
I tested power on these 2 coils
Coin door 45 on power side, 0 on other
Chime coil, 45 on power side, 3 on other
Think if I change out these diodes that could have a positive effect?
Not the diodes, gotta replace the coils. Measure ohms across the coil lugs. I bet the coin door coil is infinite and the chime coil is very high.
Quoted from dothedoo:Not the diodes, gotta replace the coils. Measure ohms across the coil lugs. I bet the coin door coil is infinite and the chime coil is very high.
Okay, would these coils not working prevent the rest of the coils to not work during game play tho?
so i checked the ohm's on those two coils and you are correct, they are way off, so I will order new coils. I do not think these are the reason I am not getting most of the coils to work in test mode or in gameplay tho
Don't bother with the coin door coil unless you actually plan to put the game on location. You are correct, they have nothing to do with the rest of the coils not working.
So when you tested the coils manually, were you grounding the tab of each transistor on the SDB or using some other method?
Quoted from dothedoo:Don't bother with the coin door coil unless you actually plan to put the game on location. You are correct, they have nothing to do with the rest of the coils not working.
So when you tested the coils manually, were you grounding the tab of each transistor on the SDB or using some other method?
I just did the alligator clip trick and grounded one end and then briefly touched the terminal with the non-banded side of the diode with the other end to get the coil to fire. (FYI for anyone using this as a reference in the future, if you touch the other terminal you will blow your fuse at F4 so be careful)
the only connectors I havent rebuilt yet are the MPU, I have an Altek mpu in but original connectors. I have them on order, so perhaps I have a faulty connection there.
That was my guess too, but I thought only some of the coils didn't work and if a couple data lines were bad you would have odd coils firing that didn't match the switches triggering them. It wouldn't hurt to test by grounding the tabs on the transistors to prove out the wiring and connectors to the playfield.
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Ocala, FL