1976 Sea Wolf Midway Monitor Power Supply

jeffm210 said:
Has anyone seen this chassis? The small board is the power supply board that slides into the metal framework. My tube lights. is there a replacement or does anyone have any parts or ideas? Thanks
Click to expand...

I don't recognize that chassis. The metal "pan" usually will have a sticker on it stating the manufacturer/model number. This sticker can fall off and become lost (sometimes it can be found in the floor of the game). The schematics in the manual look like Motorola XM series, but that picture is not a XM chassis.

Edward
 
Adds to the mystery... Surprising that no one knows what chassis Midway used in this game. Considering I have original eq. I am repairing the monitor power supply board, as another member put it easily. Maybe I just need the big 600mF cap, who might have one?
 
I don't see any 600 uf caps (I believe the Mf annotation is outdated nomenclature). There are many 680 uf or 560 uf that should suffice carried by Bob Roberts. Mouser, Digikey, etc. should also be able to provide you the part.
 
jeffm210 said:
Adds to the mystery... Surprising that no one knows what chassis Midway used in this game. Considering I have original eq. I am repairing the monitor power supply board, as another member put it easily. Maybe I just need the big 600mF cap, who might have one?
Click to expand...

Video game monitors and original equipment is almost meaningless.

In the mid 70's, there was three "major" companies manufacturing monitors for the gaming industry....Motorola, Wells-Gardner, and TEC. Then you had a handful of "fly-by-night" small companies trying their hand at a piece of the gaming pie...and manufacturing gaming monitors. Some of these companies didn't last more than a year. No one monitor manufacturer could keep up with the demand of the gaming industry, thus, you had many companies making monitors....thus you could have two identical game titles with two different brands of monitors in them from the factory. The monitor schematic in the Sea Wolf manual is a Motorola XM series monitor (that's not what you have).

Your monitor in the picture is not one of the "big three" companies (unless it's some early model I've never seen by them...you never know, anything's possible). I'm betting your monitor was manufactured by one of the many "small" companies that were around at the time.

Have you removed that chassis from the cabinet so you can get a go look at it? I bet you'll find a manufacturer tag on it somewhere. Is that a voltage doubler/triple I see in the chassis picture?

Edward
 
I have pulled it out. Only name on it is Midway and a part number. Thats why I thought it was all original EQ. There is a service repair date written on the flyback cover that is from 1976. The monitor is a B&W sylvania. The wire harnesses have not been chopped up or hacked into. Just down the street from Midway was Rauland tube and Zenith less than a 1/2mile away. It seems that Sylvania is or was a big name...

I also looked at the caps and there are some VERY old looking caps about 8" long 2" around and have multiple terminals with wires soldered on all of them under the chassis frame inside a silver canister.

I think maybe I just need to take it to a TV repair place and have them make the repairs. There is an old-time TV/VCR place nearby... :)
 
Taking it to a TV repair shop could work. It might be expensive with labor, etc. But they could probably tell you what you have. Where are you located? Maybe there's another KLOVer nearby that can take a look.
 
jeffm210 said:
I have pulled it out. Only name on it is Midway and a part number. Thats why I thought it was all original EQ. There is a service repair date written on the flyback cover that is from 1976. The monitor is a B&W sylvania. The wire harnesses have not been chopped up or hacked into. Just down the street from Midway was Rauland tube and Zenith less than a 1/2mile away. It seems that Sylvania is or was a big name...

I also looked at the caps and there are some VERY old looking caps about 8" long 2" around and have multiple terminals with wires soldered on all of them under the chassis frame inside a silver canister.

I think maybe I just need to take it to a TV repair place and have them make the repairs. There is an old-time TV/VCR place nearby... :)
Click to expand...

Sylvania is who made the tube....not the monitor. Sylvania and Amperex were the major manufacturers of gaming black & white tubes...there were others, but that's the two you usually see.

Those big caps were common in the black & white days. It's one package with multipule caps inside....usually two ,three, or four caps contained inside. That's why it'll have a lot of legs. The various values (should) be stamped on it (unless they've worn off with time).

Edward
 
I'm located in the Chicago area. I took the whole chassis into a small shop. $45 to check it, applied towards the repair plus parts. Seems fair. ???
 
LOL. I plan to stay optimistic... They felt they could after looking at it. Plus I have the schematics. Fingers crossed...
 
Sorry I am not Chassis savvy. I posted a picture of the full chassis in an earlier post. Some think it is a Motorola XM. I have not taken it in yet...
 
It is most definitely *not* a Motorola XM. It might be a M5000....I've never seen one of those. Or it could be a knockoff of an XM, but this looks nothing like a real XM501 or 701. When you said you had schematics for it, I thought maybe it said on there what it is. And note that the schematic in the Sea Wolf manual is for a XM501. It could be that the monitor was replaced a long time ago, or when your cab was made they didn't have a XM501 available and they put something else in. Who knows? Don't ya love this hobby?

BTW, it was hard to see any detail in your chassis photo. Can you get a closer picture? And what's the smaller board from? Is that part of the monitor?
 
I think mudmantim has this game... maybe get lucky and he has the same monitor? and the stickers still present to ID it?

doesn't hurt to ask him to look...
 
The smaller board is the monitor power supply board with Midway etched in solder on every board and repair notes back to 1976 when it was released. I think it is a rogue set up. The board #s match the schematic as they are also etched in solder with their board numbers (see earier post). Maybe the first run on production and then they changed or ???.

Another game owner has a different setup. Like the monitor supply board is a slide-edged board goes into a socket on the metal frame on mine. Thats why theres no connector pins or tabs on it.

All-in-all it figures I have an oddball setup... LOL
 
cwilkson said:
It is most definitely *not* a Motorola XM. It might be a M5000....I've never seen one of those. Or it could be a knockoff of an XM, but this looks nothing like a real XM501 or 701. When you said you had schematics for it, I thought maybe it said on there what it is. And note that the schematic in the Sea Wolf manual is for a XM501. It could be that the monitor was replaced a long time ago, or when your cab was made they didn't have a XM501 available and they put something else in. Who knows? Don't ya love this hobby?

BTW, it was hard to see any detail in your chassis photo. Can you get a closer picture? And what's the smaller board from? Is that part of the monitor?
Click to expand...

I can add....it's definitely not a M5000.

Edward
 
OK, I've been doing some digging in old Midway manuals. In the Gun Fight manuals parts list...they list two different 23" monitors (with different part numbers). One is a Motorola, the other is listed as a Midway monitor. I guess (in their very early days) Midway actually made their own monitors. There's even schematics for this Midway monitor at the end of the Gun Fight manual. I can't see a lot of your chassis from the pictures, but the schematics sure look like it....it even has a voltage doubler. I bet this is it.

http://arcarc.xmission.com/PDF_Arcade_Bally_Midway/Gun_Fight_Parts_Catalog_(Nov_1975).pdf

Edward
 
ELutz said:
...the other is listed as a Midway monitor.
Click to expand...
Wow. I think we have a winner! Part #'s match the ones on the chassis & power supply. Good sleuthing Edward!

jeffm210 -
Now you have the schematic for sure. As long as the yoke and the other coils/transformers are good this thing is almost certainly fixable. Even the MC1391 is replacable with an NTE815.

While you have the monitor out, please take the highest quality photos that you can. Make sure they're close ups. Then send them to Bob Roberts to add to his monitor ID page so the next guy can ID his Midway monitor more easily. :)
 
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