Turn the game off and do a continuity check from each coil on the strand and see if you have something as simple as a broken wire somewhere in the path.

If you have continuity and voltage on all of the lugs then you don’t have a wiring issue. Next up would be to test the transistors on the driver board. See if you can get them to fire by grounding the tab of the transistors, but it’s strange that the whole connector is out.

So, that indicates a wiring issue to me between the driver board and the solenoids. Get under that play field and look for a broken wire somewhere...Check solenoid to solenoid continuity. It's going to be something simple.

Just an update. This is on my machine, puck has been helping me figure this out. We have verified continuity between solenoids, no visibly broken wires. We then disconnected every solenoid connector under the platfield and grounded them out one by one (to cause them to fire), then reconnected each solenoid and grounded again, one by one, and found no faults through any of them.

The transistor is downstream of the logic to fire the solenoid. If grounding the tab of the transistor does not cause the solenoid to fire, the issue is in the wiring either between the transistor and the pins, or the pins and the solenoids themselves.

Paging zaza

The logic tells the transistor to ground, which in turn activates the solenoids. I have a TOTAN too, so, happy to measure and compare things if you need. I haven't yet had to fix this specific problem, but, intellectually, it cannot be that many things. You have power at the coils, so the path to power is working. What doesn't seem to be working is the path to ground, but maybe I have that wrong. zaza is the man and I know he will have a snazzy diagram to help

I'm not totally sure how you got (only) the knocker working by grounding the tab.
solenoids #01-08 are driven by Tip36C transistors and tab is already ground,..unless you grounded the pre-driver for sol.#7 ?!

If a group of 8 solenoids don't work, the 1st check is always the fuse ( you already did and measured 68V on lugs.)
Next is re-seat ribbon cable between powerdriver- and cpu-board, possible the chip enable for U7 has lost contact.
And finally push the ASIC gently into socket, same here with a possible poor contact on chip enable U7-11.

I do recall a problem where the ground trace around the driver transitors had blown, so that's a bonus possibility.

not really picture needed but here you go.......
snazzy.jpg

Oh, there you go, these are not TIP102s, so, yeah, grounding the tabs will not work. @zaza, how can we get these to fire to prove that the path from the driver board to the solenoids is intact?

Marc

(But you can ground the pre-driver before the TIP36c, the TIP102s and that should energize the circuit.)

Check out this chart:

http://www.pinballrebel.com/pinball/cards/Tech_Charts/Williams_Tales_of_the_Arabian_Nights_Tech_Chart.pdf

You have wires for power, and you have wires for driving the coils. The drive wires are unique per solenoid, each with their own transistor, etc.

correct, Q57-Q64 are pre-drivers for the big Tip36c transistors and can briefly be grounded at the tab to activate the coils.
When they fire, the ground-path to the transistors is fine, and so is the fuse and 70V power to the coils.

All coils are connected to each other on one side by the powersupply. The other side of the coils are driven by transistors.
When you measure continuity, you will find a low resistance connection between coils attached to VIO-xx wire.

Problem solved! I feel a bit silly at how simple of a solution it was, but that's how it goes sometimes in pinball.

The problem was that the connector on J210 (Power input on the cpu board) was not properly seating. This connector connects to J101 on the driver board and is daisy chained up to J606 on the av board. So, if my understanding is correct, the ASIC chips were not properly receiving power, and so they couldn't properly send the signal for the high power solenoids to fire.

My question is this: Is a single pin on J210 providing power specifically to legs on the ASIC which are dedicated to high power, which is in turn providing the signal to the driver board? Is it that linear? I have a lot of problems understanding the logic and signal path on boards, but if it is that simple and linear it certainly makes things a lot clearer for me.