Nanao MS9 Schematics?

[zed7]

I'm looking for some MS9 schematics (whichever revision) that're legible so I can troubleshoot some 60hz interference I have a bit easier. I've been struggling to find any legible schematics online, so I figured I can ask here. Thank you!

 

[ChuChu Flamingo]

Might be related but if this is an Egret 2 I've noticed a little wavyness in my picture with the original taito power supply. When I replaced with a aftermarket one I noticed it had qway worse diagonal line interference.

By default the taito power supply doesn't have field ground connected. Either did my aftermarket power supply. So what I did on my aftermarket one is connect it to the inside cabinet and the interference went away. Tl;dr basically stops excess voltage from running back and causing that diagonal line noise.

Is that the 60hz interference you are talking about?

 

[ShootTheCore]

Installing an isolation transformer for the monitor should help with the interference noise. Like this:

Monitor Isolation Transformer 100V Output - Arcade Parts and Repair

Arcade CRT monitor isolation transformer with 100VAC output and 120VAC input 60Hz, 100VA. color coded wires for the input & output for easy installation.

www.arcadepartsandrepair.com

That’ll stop the monitor’s power circuit from picking up ground noise from the PCB & cabinet power supply.

As for an MS9 chassis service manual, the whole service manual is included in the back of the Sega Touring Car service manual. Download this and skip ahead to Page 136 for the start of the MS9 manual, or Page 185 for the circuit diagram.

https://www.gamesdatabase.org/Media/SYSTEM/Arcade//Manual/formated/Sega_Touring_Car_Championship_-_1996_-_Sega.pdf