Jake's WG 25k7191 Info

2004-09-03
I added some pictures of how the isolation transformer is connected.

2004-01-31
Somebody sent me a copy of the schematics that are specific to the 25k7191. Also, my monitor isn't working, so I'm going to have to deal with that somehow (loud screaming sounds when I turn it on... Last time I tried it wouldn't power on at all).

2004-01-16
Added a manual for the k7191 (see below). Also added some notes about the fuse on this monitor.

2003-11-25
Click here to see pictures of a strange circuit board attached to my monitor.

I'm putting this page up because I had a few small problems while using my Wells Gardener WGk7191 arcade monitor in my Mame cabinet. It appears that a few other people have run into the same problems, so I thought I'd keep the information here for people to find.

I am using the monitor with a VGA cable hack with the ArcadeVGA video card from Ultimarc. When I tried to run Windows 98 at 800x600 or 640x288, the display wouldn't look right. At the bottom of the screen, there was a fold where the screen would curl, and in effect I was losing the bottom part of the screen. This affected Mame games that run at certain resolutions also and runnig Windows at 800x600 or 640x288 (640x480 worked fine). On the Ultimarc message board, someone mentioned that they had fixed this same problem. (Note: this also affected certain games when I was running my monitor with the Trident Blade T64 card with AdvanceMame.)

FUSE:
I pulled out the fuse and took a look at it. The fuse in my monitor is "2A 250VAC". On the fuse, it also says, "BEL 3 SB". The monitor's circuit board where the fuse plugs in has "2A 250VAC" printed on it. There are little icons on the fuse for "SB" and "UL". I think that the "SB" stands for Slow Blow.



Click the thumbnails for full-size pictures.
K7000 Monitor Manual (pdf) I finally got my hands on the manual for the k7191. It's in pdf format, and actually the manual is for the k7000. However, Wells Gardner sent it to someone for use with the k7191, so I am assuming that this is the correct manual.

NOTE: The schematics diagram in this manual mentions that the diagram is for the 9k7700, 13k7800, 19k7600, and 19k7900 monitors and to "Refer to other schematic diagrams for certain unique models.". See the next image for the 25k7191 schematics.
The schematics diagram for the Wells-Gardner Model 25K7191.
Here's a picture of the diagram that is printed on the back of my k7191 monitor.
Here's close-up of a picture of the pot that I adjusted to fix the curling problem. Note that you need a screwdriver or something to adjust it. It almost doesn't look like a pot at all (to me, but I'm not experienced with this stuff at all).
Here's a zoom-out of the same pot.
Here are the outputs for the monitor cable. These are the wires that need to be spliced to a VGA monitor cable hack for use with the ArcadeVGA PC video card from Ultimarc. Note that I also added a vsync wire to my VGA cable hack. This is required in order to use the Act Labs PC USB Light Gun with the arcade monitor.
My monitor gets power from the black and white wires.
These wires go into my isolation transformer, then back out to a wall plug.

Note:
Act Labs USB PC Light Gun is now working!
Andy Warne at Ultimarc has been running some tests with the Act Labs gun and arcade monitors. He discovered that if you use an arcade monitor and you splice the hsync and vsync wires together in your VGA cable hack, then the light gun won't work. I added a wire to my monitor's output cable for the vsync, and wired it correctly to the video card, and now I'm playing gun games on my cabinet. Sweet! By the way, according to Andy, this fact is true no matter what kind of video card you are using.

Here are some useful links:
VGA to Arcade Monitor Tutorial A very good page that helped me wire my monitor to my computer
BYOAC The build your own arcade controls has very good info on all aspects of building arcade machines. If you have any questions, there are many helpful people in the messsage board. There is also a lot of info in the huge FAQ there.
Mr. Salty's VGA to Arcade Monitor Info Another page that I found useful for a second opinion while hacking a VGA cable for my arcade monitor.
Ultimarc's web site This is where the ArcadeVGA card was created - totally awesome for connecting an arcade monitor to your Mame computer.