Before I get into too much detail, would it be inappropriate for me to start a thread on the Restoration forum since it is not a pin and I do not plan on restoring this to like new condition at this point?
Now onto the fun stuff!
I got my manual yesterday started digging into the literature last night. During my review I learned a few things:
1) This is going to be a really cool and rewarding learning experience for me and my kids!
2) The power supply assembly drawing is not what is in my machine. Based on what I gather from pinwiki, my power supply board is an earlier version so I just downloaded the drawing and schematic available on pinwiki.
3) The CPU is a system 6.
4) The Sound board does not appear to be quite what is in my game, but I will worry about that later.
I'll probably be giving more detail than needed, but I'm new to this and I want to make sure I can go back and see what I did and why.
This morning my son (he's 9) and I decided to take our first crack at this.
Upon powering up the machine the display lights came on as did the florescent light over the pins. None of the scoring boards or lights came on and the pins did not come down. On the CPU board both diagnostic LEDs lit up and stayed lit. The logic diagram indicates a CMOS RAM (IC19) failure.
With that in mind, I decided to start simple and test the power inputs on the power supply assembly (labeled 3J1 on the drawings). Unfortunately the power supply board schematics for the early version of the power supply board do not indicate the voltage that should be at each pin, so I just used the later power supply schematic on pinwiki. My results were as follows:
Connector ID-PIN(schematic voltage): my voltage
3J1-1 (+18v +-2V): 22.8v
3J1-2 (+28v): 6.03v
3J1-3 (+28v): 6.03v
3J1-4 (90vac): 58.37v
3J1-5 (not used)
3J1-7 (not used)
3J1-8 (not used)
3J1-9 (90vac): 18.8v
3J1-10 (9.30vac): 10.5v
3J1-11 (9.30vac): 10.6v
Did I jump the gun by testing the pins on the power input connector (3J1)? If not, what are the possible reasons for my voltages being low on pins 1,2,3,4 & 9?