HELP: Power Supply / Isolation Transformer

NERDtendo

Well-known member

Donor 2011
Joined
May 14, 2010
Messages
4,672
Reaction score
357
Location
Republic, Washington
I am making a Standard JAMMA out of all of my spare parts that I had in my closet. It will go in an old gutted Double Up video poker upright cab that I have. I wanted to make a drop in AC power unit (much like The Real Bob Roberts without the $100 price tag).

http://www.therealbobroberts.net/accenter.html

I had a JAMMA power supply and the AC unit for a Nintendo cab, I pulled the gold box and replaced it with my little black one. I made it look decent and then I got to questioning it. The isolation transformer takes in 120v and puts out 100v. Am I going to need to replace the iso transformer with a 1:1 for it to work in a Standard JAMMA???

On another note, I have never worked with JAMMA before. The only arcades that I have repaired and rebuilt are Nintendo. Do standard arcade CRTs have electrical plugs or are they two holed molex type connectors for the power??? The reason I ask is that The Real Bob Roberts offers a harness to go on the iso transformer and it has a molex type connector where the Ninty version has a lower voltage outlet inside the machine.

http://www.therealbobroberts.net/isoharn.jpg

I have a number of forks in the road and I am wondering which path would give the best results.

I could change the iso transformer. Then change the outlets to allow for three pronged cords (this would help if I end up installing an computer LCD monitor instead or an original arcade CRT).

I could see if I can locate a Standard JAMMA compatible monitor that requires 100v (if they exist).

I could get the iso transformer and harness from Bob Roberts and call it good.


I am okay with leaving my on/off switch, fuse, and line filter the way they are; correct???


I am starting to think I should have just bought the Bob Roberts delight but I figure I will turn this into a learning experience.
 

Attachments

  • POWER SUPPLY.jpg
    POWER SUPPLY.jpg
    95.8 KB · Views: 43
Most monitors usually have a two pin Molex on them - there are a couple of different types. Nothing is stopping you from splicing a normal household cord onto them and plugging it into the Nintendo isolation transformer output.

Most monitors should work OK on 100v, others might not. You'll have to try and see. Depends on what kind of monitor you intend to use. You may have to adjust the B+ voltage to run the monitor on lower input voltage. You could also just swap the isolation transformer for a normal 1:1 one if you have problems using the Nintendo one.

-Ian
 
Back
Top Bottom