roothorick
Active member
This is more just putting my thoughts down so I don't forget anything, though commentary from the enlightened peanut gallery is welcome. For reference, it's a 4-25 version 3 with the black marquee.
Outstanding problems:
As a precaution, I removed the battery from the mainboard. It looked, frankly, almost brand new. I didn't see any signs of leaking at all. Still, I'm leaving it out. I'll add on a connector and put a displaced battery somewhere in the cabinet (much) later.
Troubleshooted the sound issue a little bit. Speakers meter good -- 8ohms each. Didn't check cabinet wiring. Checked 12V -- 12.15 at edge socket with board connected. Using some shitty unamplified speakers I had laying around, plugged into the headphone jack, as a workaround until I get around to figuring out what happened to the amp.
Played with the monitor a bit too. Green and red respond to cutoff/gain pots but are VERY weak. As I turn up the gain pots, they become visible but very dim, then just bleed out, still very dim. I'm scared for the tube
still, I'm gonna try swapping around the CDTs.
The marquee lights are not what I was expecting. I was expecting a SMT LED array with a diffuser. What I actually found is what appears to be electroluminescent pads (think EL wire except a solid rectangle), four of them on two PCBs, driven by yet a third PCB mounted behind the marquee. Fascinating shit, I'm gonna have to spend some time with this circuit.
Outstanding problems:
- I do not like ANY of the games in it
- No sound from speakers. Headphones are fine (volume goes up to FREAKIN' LOUD!) though.
- Monitor has very very weak red and green.
- Title card lights don't work.
- DAT CP. Left joystick is utterly unusable, right A button is completely destroyed.
As a precaution, I removed the battery from the mainboard. It looked, frankly, almost brand new. I didn't see any signs of leaking at all. Still, I'm leaving it out. I'll add on a connector and put a displaced battery somewhere in the cabinet (much) later.
Troubleshooted the sound issue a little bit. Speakers meter good -- 8ohms each. Didn't check cabinet wiring. Checked 12V -- 12.15 at edge socket with board connected. Using some shitty unamplified speakers I had laying around, plugged into the headphone jack, as a workaround until I get around to figuring out what happened to the amp.
Played with the monitor a bit too. Green and red respond to cutoff/gain pots but are VERY weak. As I turn up the gain pots, they become visible but very dim, then just bleed out, still very dim. I'm scared for the tube
The marquee lights are not what I was expecting. I was expecting a SMT LED array with a diffuser. What I actually found is what appears to be electroluminescent pads (think EL wire except a solid rectangle), four of them on two PCBs, driven by yet a third PCB mounted behind the marquee. Fascinating shit, I'm gonna have to spend some time with this circuit.
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