Collectibles-General (Antiques)/Slot Machine



I am new to Slot machines and I believe I have a Bally 873 5 line. Can you verify with the attached pictures? I am in need of a repair manual. As you can see in the picture it lights but does not register the coins. When I manually move the wire at the coin slot I hear one of coils click in but that is all. I did read one of your responses to someone else and cleaned the connectors in the back of the reals and coin units. Any help would be greatly appreciated.

Hi Frank,

I agree that this machine could be the Bally M-873 model but It looks to me that it has after market glass in it which is not all that uncommon, same game but casinos sometimes had the designed of the glass changed to fit their casinos design. It also looks very clean inside so it could of been rebuilt by some company in the past. I see in the photo that the insert coin light is on, when you insert the full 5 coins does the "insert coins" light go off? Oh, I see you say it does not register the coins, so try tripping (flick the coin switch wire) the coin switch wire under the coin mechanism 5 times, does this register and make the "insert Coins" light go off?

The Bally 2400 manual is the best of the original Bally manuals for these machines that Bally put out. There is another huge manual that is an after-market manual that is unsurpassed in photos and details of how these Bally Electro/Mechanical machines function and its like 250 pages with hundreds of photos. This manual will even show you how to get into that top box where the rest of the relays and steppers are located. I have this manual if that is something you're interested in, but you would have to email me at for this information. I'll give you the links to the other two manuals I suggested below as they are listed on the website. The 2400 manual is the perfect companion to the one above as it has the Bally part numbers and part names in it and it is faster to use being a factory service manual as it doesn't take the space like the one above to explain how it all operates. Here are the links:
Once there look for these two manuals:

Bally Electro/Mechanical Manual Number 2400
This is about the best manual Bally ever made for the Electro/Mechanical machines, from the 700 Thu the 1000 model number series machines. Also has detailed stepper units for some of the models. Very good book, good for learning and troubleshooting with. 131 pages of great information

And this one:

Bally Electro/Mechanical Trouble Shooting Manual/Guide
This is great help for finding those problems with your Bally e/m slot machine

Also when it becomes time to sell your machine these items will help to sell it as people who don't know these machines want a service manual.

Thank You
Rodger Knutson

Collectibles-General (Antiques)

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Rodger Knutson


I am an expert on old coin operated machines, slot machines, trade stimulator's, jukeboxes, old arcade machines, etc. I have been identifying these for people who respond to my web site listed below, for a few years now. In almost all cases I am able to tell them about their old coin operated machines, the year, the value, and other general information about their machines. I do not know much about soda vending machines, coin banks, or scales, but I will try to help you with these if I can. Please email photo's to: My web site is at:


I bought my first slot machine, a .50 Cent Mills Black Cherry in 1969 and have been hooked from that time, I still have that Slot machine! Before that I found a open barrel full of old scraped jukebox wall boxes behind a restaurant, I wanted them all but never took a one of them. Anything that took a coin drove me nuts!

C.O.C.A. and other slot and coin operated machine groups, associations, groups, and clubs.

Many, the Coinslot magazine, always juken, Coin Slot Journal, Slot Box Collector, and others that I don’t remember at this time.

Graduated from Ballard High School in 1969, went to Edison Technical Collage for a couple of years taking welding and metal fabrication, tig, mig, heliarc, also arc and gas welding and fabrication. Then Apprenticed under a slot machine technician who worked in the slot machine industry Reno Nevada, and set up bar poker progressive machines in the casino's, and repaired machine and did the repairs on slot machine circuit boards there. He also was involved in the 2 hand dealer's market and bought and sold machines at the casinos auctions for the secondary market, which includes selling used machine overseas. I learned a ton from this man; he always had the correct answers and took the time to teach me the business. My interest and knowledge in other and older coin operated machine is for the most part, self-taught. It's been my passion from back in 1968 and before, my thirst for knowledge about these machines has kept me more interested over the years, and keeps me searching for more information even today. I have meet and talked to book authors on these machines, attended hundreds of coin operated shows and auctions, and I stay with that to this very day.

Awards and Honors
Take a look at my allexperts rating, and my guest book, links to these are at Also you can check my 100 percent rating on ebay, as I have been there with ebay from their day one, I am user coinslots at ebay. My other awards come from the very people that I deal with, I always make them happy, no matter what it takes, but they always are happy anyway as the countless thank you letters testify to me, so I know I am doing right, and the best I can. I have found so many hard to find parts for people, I hunt them down and don't stop until I find what is needed to get that customers machine running again and back to life, that is my main goal.

Past/Present Clients
Client privacy prevents this answer, as some are VIP and famous and I will not betray the trust.

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