Checked all the usual suspects - fuses, wiring, rectifier, connectors etc etc. reflowed the connectors just in case (a bit dull). No change - Finally swapped in another Rev C SDB from another pin, and machine ran 100%.

Swapped bad board into the donor machine - same result. All coils dead.

So, we have narrowed it down to the board.

Voltages from SDB in the donor pin:

Solenoid Driver/Voltage Regulator board:
* TP1 = +5 vdc. 5.0.
* TP2 = +190 vdc. 175.
* TP3 = +5 vdc. 0
* TP4 = +230 vdc. 245-250 (fluctuating)
* TP5 = +11.9 vdc. 15.8
Tp6. 0.
Tp7. 0.
Tp8. Ground

So - no 5v at TP3. I’m not sure what 6 and 7 should read - they’re not noted anywhere ...

Any ideas?

TIA!

#2 2 years ago

???

pinwiz_pa

Pinside member

Mifflinburg, PA

11y 23,150 127

TP1 and TP3 should both be 5v... have you done the solenoid board upgrades mentioned on the Pinwiki site? https://www.pinwiki.com/wiki/index.php?title=Bally/Stern#Solenoid_Driver_Upgrades

#3 2 years ago

DNH

Knxwledge

Pinside member

Ramona, CA

5y 81,300 1,896 11 8 2

Check your connection in the area marked in red, and like was stated above, tie TP1 and TP3 together. Sounds like J3 needs to be repinned

image_2021-05-30_094344 (resized).png

#4 2 years ago

rotordave

Pinside+ Frequent

14y 210K 13,705

Cool, yes I had read about tying TP1 and 3 together.

I’ll give that a shot in the weekend and report back.

#5 2 years ago

DNH

Knxwledge

Pinside member

Ramona, CA

5y 81,300 1,896 11 8 2

OP
Quoted from rotordave:
Cool, yes I had read about tying TP1 and 3 together.
I’ll give that a shot in the weekend and report back.
rd

If you do that, along with the other suggested upgrades and it fixes it, I would still repin the male and female part of J3. If one or two pins got a poor connection like that, who knows if the other ones are likely to follow.

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