Dynamo HS-5 Restoration

[Deebo]

This is my first attempt at a cab restoration, and am using this as a learning experience. I bought this non working HS-5 cabinet, and am hoping to get the original hardware back to working order. Currently the only thing that is working is the marquee light, and the fan in the CPS2 board.


The board on the left seems to be some type of video slots game board, and seems to have it's own type of "JAMMA" harness, and from what I can gather this harness and the JAMMA harness going to the CPS2 are being shared somehow. The power supply shown here is unused. Everything is running of a 200 watt PS in the rear of the cabinet.



The monitor seems to be a WG 25k7191, at least that's what the label on the chassis mount says. From everything that I've been reading, this monitor type has to run through an ISO transformer, which I believe one of the below picture shows. Please correct me if I'm way off base. I don't get any type of filament light on the back of the monitor. Can one of the many issues be a faulty ISO transformer? This seems like the easiest place to begin, (other than the fuse) before I even dare to learn about chassis repair.






ISO Transformer??



Inside the back of cabinet:



I've started by removing the extra board and disconnecting all the CP wiring.

Questions:

Is there any inexpensive way to connect the CPS2 board for testing with out having to buy extra hardware like the Supergun I've read about?
Is documentation available that has the original wiring and connector types for this cabinet? I was hoping to use the existing connectors if possible.
Should I just say screw it, and thrown in a LCD and PC, and call it a day?

 

[DonPanetta]

You should have left the wiring in for now.

The big question here is why do you have two power supplies installed?

 

[Deebo]

You should have left the wiring in for now.

The big question here is why do you have two power supplies installed?

It came like that...the one on the drawer looks like it might've been the original, but it's dead. The only wiring I removed was where the board on the left connected all the buttons. My first goal is just to get power to something else other than the marquee and CPS2 board fan. I don't even know if it's good unless there's a easy way to test it.

 

[DonPanetta]

It came like that...the one on the drawer looks like it might've been the original, but it's dead. The only wiring I removed was where the board on the left connected all the buttons. My first goal is just to get power to something else other than the marquee and CPS2 board fan. I don't even know if it's good unless there's a easy way to test it.

neither of the two power supplies seem original to the cabinet although that's not a huge issue at the moment. The original power supply is an XT style power supply. The current 2 in your setup will work as they are pin compatible but as you can see by the pic of the rear unit, they don't mate up with the cutout in the back of the cabinet.

I'd work on getting the power supplies issue sorted and the voltages tested. then fire up the cab again.

 

[PrairieDillo]

25" K7000A monitor

 

[SillyB]

Congrats on your Dynamo! I love them and have restored a ton of them.

This is my first attempt at a cab restoration, and am using this as a learning experience. I bought this non working HS-5 cabinet, and am hoping to get the original hardware back to working order.

I've learned a ton just by jumping in and doing lots of reading on this forum. In the beginning I also really liked the Arcade Repair Tips channel on youtube. They have a series of videos that walk you through a lot of the basics people around here will take for granted you already know.

Currently the only thing that is working is the marquee light,

This tells us that you have 120v from your plug, cord, receptacle, power switch and isolation transformer. That helps to identify where to start your trouble shooting. Look at the Bob Roberts power diagram https://forums.arcade-museum.com/threads/bob-roberts-power-center-diagram.420801/

and the fan in the CPS2 board.

That means you have voltage to the jamma harness somewhere near 5v. A cheap mulitmeter can verify how much exactly you have. 4v will be enough to run the fan but not power the game. Arcade Repair Tips has videos how to check voltage and adjust power supplies. Unfortunately CPS2 games have a suicide battery and when it runs out of voltage the game dies. I've had a few previously working CPS2 boards die on me in the last year. If you have good voltage at the jamma connector, there is a good chance your board isn't working. They can be repaired using a few different methods.

The monitor seems to be a WG 25k7191, at least that's what the label on the chassis mount says. From everything that I've been reading, this monitor type has to run through an ISO transformer, which I believe one of the below picture shows. Please correct me if I'm way off base. I don't get any type of filament light on the back of the monitor. Can one of the many issues be a faulty ISO transformer? This seems like the easiest place to begin, (other than the fuse) before I even dare to learn about chassis repair.

ISOs almost never fail. They are just windings, so physical damage is the only way I've seen one fail.

That monitor like PrairieDillo mentioned is a Wells Gardner K7000a. These monitors give a great picture and are very reliable. They get a bad rep because they were built by Zenith and use an obsolete flyback transformer which can't be sourced, but they aren't as failure prone as the standard 7000.

You can't always see neck glow. Usually you can hear HV if you have raster. You can turn the brightness all the way up and see if your screen turns white to determine if the monitor is powered.

Questions:

Is there any inexpensive way to connect the CPS2 board for testing with out having to buy extra hardware like the Supergun I've read about?

Find another local arcade guy and put the board in his game!

Is documentation available that has the original wiring and connector types for this cabinet? I was hoping to use the existing connectors if possible.

@DonPanetta is the guru of historical documentation on Dynamo cabinets. There is a good website with Dynamo info too https://www.drzero.org/videogames/dynamo/

Should I just say screw it, and thrown in a LCD and PC, and call it a day?

NO! It's worth the effort to fix whatever is going on here and have a real arcade game. If the CPS2 is dead you can get a $35 pandora's box from Aliexpress and it plays 1,800 games. If the monitor is dead someone can fix it. Just be patient and you'll get it resolved.