OP

Quoted from tombags:

Hello, I am working on a Stern Dracula and the boards were toast so I replace all 4 of them with Alltek boards. After replacing the boards the lights, solenoids, displays all worked. After sitting for a short time, the displays, lights still work however the solenoids stopped working with the exception of the knocker, coin lockout. I measured the voltages and they are all there, I checked the fuses out of circuit with a meter and they all fine. I have a spare Alltek MPU and put it in and still no solenoids or flippers. The new driver board does not show any errors. The switches are scoring correctly just the solenoids, flippers are not working. Any idea where I should look? Thanks in advance for any help.

OP

Quoted from tombags:

Yes I checked the playfield fuses and the board fuses. When the coil is engaged it makes a noise but doesn't pull in.

OP

Quoted from tombags:

Problem solve, and bigguybbr was correct, the rectifier board is one pin off. I measured the voltage at the pins of J1 on the Alltek board and matched them up with the wires according to the schematics and all the coils and lights function correctly. Thanks to bigguybbr for the help. Now on to the next probem, no sound from the SB-100.