I'm new here but I am hoping I can get some assistance of an issue I am having with my Gottlieb Volcano. I have a sequential set of solenoids that are not working. They are #22 ball gate return, #23 ball release, #24 ball saver relay and #25 motor relay. I've bench tested the solenoids in question on the board (Q13 thru Q15) and all seem good. These are go back to the Z4 chip on the solenoid board so it could be suspect but I'm not sure what do look for next. I did test the Z4 chip for 5 volts at pin 16 and it was good. I'm not sure what to look at on that chip next or if the issue could trace back to the MPU. I'm hoping someone here with experience can tell me what the next steps should be. I've attached the snips of the schematics as an aid.

Gottlieb Volcano Schematic111022019.pdf

Gottlieb Volcano Schematic211022019.pdf

Gottlieb Volcano Schematic311022019.pdf

Thanks for the response. I've done what you suggested and there is a pulse on the CK input of the Z4 chip, so I assuming it's good. But I'm going to order a replacement as a precaution and its always good to have some on hand. I have a new question regarding the pin designations on the Gottlieb boards. On the schematics pins are identified as either an alpha or a numeric. You can see on the board the starting pin identifier (1 or A), but from what I can tell not all letters or numbers are used and I'm having a hard time determining the exact pin location on the board (Z for example). Also, some letters on the schematics have a solid line above them and I'm not sure what that refers to. Any clarification would be appreciated.

Thanks for the info, this is very helpful. I assumed that the Alpha pin id's omitted some letters but my Goggle searches were of no use so this clears that up. Also, the letters with the line above them being just additional pin id's makes sense. Now I'll have to wait for my chips and I'll replace that one using a socket as well. Hopefully that will be it.