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If you have a slot machine or you have bought one old used vintage slot machine and want to have some fixes to get it work then obviously you will think you need a machine technician. Many of you will even think of taking it to some repair station to get things done. But here in the guide you will find some of the repairs that you yourself can do with your slot machine and you need not need to join machine technical repair training school.

Like any other machines Slot machines too are a blend of electronic and mechanical components, that wear with age and require routine repairs. Before you begin to repair yourself do note that every slot machine that you have purchased whether old or new comes with installation and user guide manual. You need to read that many a times until you are familiar with each components and parts of the slot machine and understand thoroughly as how the slot machine works.

In your guide to repair slot machines you will find some common repairs that can be carried out by you, some videos to watch as well. If your slot machine has some complex issue then obviously you require a qualified technician.

Changing the Top Florescent Light

The top florescent light bulb is easily changed by following these simple procedures. The replacement bulb is an F15T8/CW 18″ 15 Watt bulb which is available at most hardware and department stores or may be purchased online at Ebay or Amazon or realslotmachinesforsale under the category ‘parts of slot machine’.

• Open the main slot machine door and ensure the door is fully open. Turn off the power to the slot machine. The power switch can be found with the main door open about midway down on the right side just inside the machine.
• If the machine is equipped with a top ticket printer, you must pull the bottom of the printer out far enough to see where the ticket paper is located, and note the area large enough to place a couple of your left fingers under.

• Remove the top metal trim strip which is a cover plate to the right of the ticket printer and/or is located along the bottom of the top glass. There are a couple of clips on the back of the metal trim strip that fit into notches on metal bracket which holds the top glass. The metal trim strip should be lifted upwards and outwards to remove.
• Once the metal trim strip is removed, the next step is to remove the top glass. Note that some top metal trim strips have a slot in the top that holds the top glass and they must be removed very carefully as to not damage or drop the top glass.

• You can now see the top glass is held in place by usually two or three clips that rise above the metal bracket behind the top metal trim strip. Now slowly lift up on the top glass from both bottom edges until the top glass until it is high enough to gently pull it forward and allowing it to slide down and away from the top track and clips holding it in place.
• Once the top glass has been removed, put it somewhere where it will not get knocked over or broken. You will see the florescent bulb in the middle of the top box area of the machine. Care should be taken removing the bulb as it may be very hot. Remove the old bulb by twisting the florescent tube about a quarter to half turn allowing the two prongs on the bulb to slide out of the fixture on both sides of the bulb.

• Remove and discard the old bulb. To install the new bulb, align the two prongs on each side of the florescent tube with the slits on each fixture in the top box of the slot machine. Twist the bulb into place normally using about a quarter to half of a turn. If the bulb is not secure or aligned, repeat the procedure.
• If your slot machine is an IGT S Plus machine, it is equipped with a florescent bulb starter. Then you can replace the starter when replacing the florescent light bulb. The starter is an FS-U Universal Starter. They are available at most hardware and department stores or may be ordered online too. The starter for the top florescent bulb on an IGT S Plus machine is located directly behind the florescent bulb fixture on the left side of the slot machine in the top box area.
• It is replaced by twisting about a quarter to half a turn as it is held in place with a bayonet type mount. Remove the old starter and discard. Replace with a new FS-U Universal Starter by aligning the two pins on the bottom of the starter with the notches in the starter receptacle, pushing it up into the starter socket, and then twisting it a quarter to half a turn into place.
• Prior to re-installing the top glass, turn the power switch on the right inside of the machine on to verify the bulb works properly. If it does not, turn the power off and check that the bulb is properly installed and secure. If replacing a starter, check that it is also properly installed and secure.
• After verifying the bulb is working, it is now time to replace the top glass. If your slot machine has a top ticket printer, ensure the ticket printer is still pulled out so you can place your fingers in the opening while replacing the top glass.
• Carefully and slowly lift up the top glass placing each hand under the bottom of the top glass. Slide it into the upper edge track on the top box of the slot machine carefully lifting it so it slides into the tracks while being able to push the top glass back far enough to clear the two or three raised clips on the metal bracket where the top glass holding track is located.
• Gently and slowly lower the top glass behind the clips so as to allow them to hold the glass in place. If properly secured, the top glass will not be able to slide down or out of its position. Keep a secure hold on the top glass until you are certain it is secured in the proper position.
• Replace the top metal trim strip by aligning the two or three hooks the back through the metal bracket that supports and holds the top glass. Once the hooks on the back are in place, gently push the top metal trim strip down and it should snap into place. If you have a slot machine with a top ticket printer, close it tight into position. Close the main slot machine door and you are ready to play.

Changing the Belly Glass Florescent Light

The belly glass florescent light bulb is easily changed by following these simple procedures. The replacement bulb is an F15T8/CW 18″ 15 Watt bulb which is available at most hardware and department stores or may be bought online as spare parts of slot machine.

• Open the main slot machine door. Turn off the power to the slot machine. The power switch can be found with the main door open about midway down on the right side just inside the machine.
• Facing the slot machine door, look on the right side of the door just around from bill acceptor area. You will see a knob sticking out that is approximately the size of the end of a regular pencil. This knob when pulled out releases the slot machine belly glass assembly (belly door) to fold down so the bulb can be accessed.

• There are a couple of very important thing to remember prior to pulling this knob to release the belly door. First try pulling gently on the knob. If it does not allow you to pull out and you have a lock installed directly above it, the lock must unlocked in order to allow the release knob to pull out. When pulling out the release knob, be ready for the belly door to fold down.
• Most of the time you must lightly pull on both sides of the belly door to get it to fold down, however always place your hand under it so it does not fall down too quickly causing the belly glass to break or crack.
• Once the belly door is in the down position, you will see the access to the florescent bulb bracket that is held in place by a small Phillips screw. Remove the screw and place it the coin tray so it will be handy when you need it after replacing the bulb.

• The long metal bracket that holds the florescent bulb must be slid slightly right or left so as to be able to lift it out of the belly door. Gently lift the metal bracket with florescent bulb out of the assembly far to be able to turn it over to replace the bulb. Be cautious as the bulb could still be hot!
• Grasp the metal bracket holding the florescent bulb and remove the old bulb by twisting the florescent tube about a quarter to half turn allowing the two prongs on the bulb to slide out of the fixture on both sides of the bulb.

• Remove and discard the old bulb.To install the new bulb, align the two prongs on each side of the florescent tube with the slits on each fixture that is on each side of the new bulb. Twist the bulb into place normally using about a quarter to half of a turn. If the bulb is not secure or aligned, repeat the procedure.
• Now turn the metal bracket that holds the newly installed bulb over and back into position in the belly glass assembly. Slid the bracket slightly right or left into position and replace the small screw which holds the metal bracket in place.
• If your slot machine is an IGT S Plus machine, it is equipped with a florescent bulb starter. So you need to replace the starter a well when replacing the florescent light bulb. The starter is an FS-U Universal Starter. They are available online and you can purchase one.
• The starter for the belly glass florescent bulb is located on the back of the main slot machine door on the lower right hand corner as you face the back of the door.

• It is replaced by twisting about a quarter to half a turn as it is held in place with a bayonet type mount. Remove the old starter and discard. Replace with a new FS-U Universal Starter by aligned the two notches on the bottom of the starter, pushing it into the starter socket, and then twisting it a quarter to half a turn into place.
• Prior to closing the belly glass door, turn the power switch on the right inside of the machine on to verify the bulb works properly. If it does not, turn the power off and check that the bulb is properly installed and secure. Also check to ensure the starter is properly installed and secured.
• Lift the belly glass assembly up and push it into place in the slot machine door. Ensure the belly glass door snaps into place and the knob on the side of the door is in its normal position. It is spring loaded so as to not allow the belly glass assembly to open unless it pulled. If the belly door appears to be in place, pull on both sides of the belly door to make sure it is locked and secure.
• If you unlocked the lock above the knob, re-lock it. Close the main slot machine door and you are ready to use your slot machine.

Changing the Push Button Bulbs

All of the slot machine’s push button lights such Play Max Credits, Spin Reels, Bet One Credit, etc. are easily replaced by following this simple procedure. The replacement bulbs are #161 on IGT S2000 machines and #555 on IGT S+ machines and may be purchased from online stores.

• Fully open the slot machine door. Look on the backside of the door. Each push button will extend down from the shelf on the door and will have a small wire bundle going to it. Identify which push button bulb needs to be replaced.
• Carefully pull down on the bottom of the push button area that is normally white and is where you will see wiring connected. Using your thumb and two fingers, pull straight down and the bottom portion of the push button should snap out.

• You will now be able to see the bulb in the top area of the lower push button assembly. Use caution as the bulb may be very hot. Pull the wedge bulb out and discard it. Notice the slot in which the bulb located.
• Place a new bulb in the slot noting the direction of slot ensuring the new wedge bulb is inserted so as to line up in the slot. Push the new bulb into place.

• Replace the bottom of the push button assembly by inserting it into the top portion of the push button assembly. The bottom portion will snap into position. Ensure that none of the wire connections have been accidentally knocked loose on the bottom of the push button. Note the push button light will not illuminate until the slot machine door is closed. Close the main slot machine door and you are ready to play.

Changing the Small Panel Lights

The small panel lights that illuminate the denomination amount and other areas behind the glass are easily changed. For denomination amount lights on the IGT S2000, a #73 bulb is needed and a #86 bulb is needed on the IGT S+ slot machines. They may be bought online from slot machine selling sites.

Here it is described as how to change the lights behind denomination amounts such as .25 Cents. Other small panel light bulbs are changed in the same manner.

• Fully open the slot machine door. Look on the backside of the door. Note the location where the denomination amount would be located near the center just below the slot machine’s center glass. The area will appear to be flat with a small bulb holder projecting out that is slightly larger in diameter than a regular pencil and is flat on two or four sides.

• This bulb holder is removed by simply twisting it a quarter to half a turn and then gently pulling it out of its socket. It is held in place by somewhat of a bayonet type mount.
• Once the bulb holder is removed, pull the wedge bulb out of the socket and discard the old bulb. Caution should be taken as the old bulb may be very hot. Replace the bulb by firmly inserting a new bulb into the socket of the bulb holder being careful to align the wedge bulb correctly into the slot.
• Take the bulb holder and look for two notches on each side of the opening where the bulb holder is inserted. Note there are two notches on the bulb holder. Align the notches inserting the bulb holder into the panel.
• Gently twist the bulb holder about a quarter to half a turn to lock it into place. Verify the bulb is illuminating, and if not repeat the procedure using a different new bulb. Now close the main slot machine door and ready to use.

Cleaning Your Slot Machine

This is common thing and all you need is usually nothing more than a damp cloth to clean the exterior cabinet of your slot machine. Never use any abrasive or ammonia based cleaners on the cabinet of the machine.

The slot machine top, center and belly glasses may all be cleaned on the outside by using a window cleaner. However if you own a slot machine with a frosted exterior glass or one that has any exterior decorated markings such as stars, a window cleaner should not be used as the cleaner may damage the exterior images. Care should be taken cleaning interior glass as a cleaner and cloth may damage labels or markings.

The inside of the slot machine should not require cleaning other than occasionally removing dust. This can normally be done with a damp clean cloth, however ensure the power switch has been turned off prior to cleaning.

When wiping dust inside your machine, be careful not to loosen any wires or connections. Do not use a damp cloth on the face of your reel strips as the playing symbols on the reel strips could come off or become torn. Also be very careful not to touch the back side of your reel strips with a damp cloth especially if the back sides of the reel strips are black. This can cause damage to this type reel strip.

When your Slot Machine Doesn’t Power On

When you get a slot machine and wish to locate or set up at your place, determine the household 120V AC outlet you are planning to use has power. Keep in mind some outlets are controlled on and off by a wall switch.

• With the slot machine unplugged from the outlet and surge protector, open the slot machine main door. Remove the coin tray by lifting up and pulling out the tray. Simply pull it out and down to remove the tray.

• The hopper is on the bottom floor of the machine and slides out on two base rails along two metal guides. Slide the hopper out slowly by grasping the handle with your left hand and supporting the hopper with your right hand. Do not use the black hopper bowl to pull the hopper out of the slot machine.
• On the lower right corner of the slot machine you should see the black power cord coming into the machine. The power cord plugs into the Power Distribution Unit which is located on the back wall of the slot machine.
• Verify the power cord is firmly plugged into place into the right side of the Power Distribution Unit.

• Place the hopper back into the slot machine making sure it slides in easily and completely with the base rails on hopper guides on the bottom of the machine. The hopper plugs into a receptacle toward the back of the machine. It is designed to fit in easily without using excessive force.
• The coin tray can be easily put back into place by ensuring the alignment pins on the coin tray match up to the top alignment holes on the bottom side of the machine. The tray should be pushed down into place. Make sure the tray is even when pushed into place. If the coin tray is not aligned and even, remove the coin tray, and repeat the procedure.
• Verify the power cord is firmly plugged into a good surge protector. Plug the end of surge protector into the outlet you have verified is good, and make sure the on/off switch on the surge protector is turned on.
• Now turn the power switch on the inside right of the slot machine to the on position and verify the slot machine is powered on by lights illuminating.

Jackpot Payout Reset

When your slot machine just hit a 25,000 credit Jackpot it now needs to be reset to continue playing. Depending on the model slot machine you have and the amount of the payout will determine the best course of action.

If you have an IGT S+ Slot Machine and your win is under the maximum payout amount specified on the center glass of the machine, the hopper may run out of coins or tokens. This is normally displayed by Error Code 3300. In this case it usually a simple matter of taking the coins or tokens that have been paid out and putting them back in the hopper allowing it to fully pay out. However, if you won a large jackpot that is “hand pay out”, then follow the steps below.

• First open the main slot machine door. Locate the Jackpot Key which is normally kept inside the slot machine in a plastic envelope on the side of the cash box. If you do not find it inside the machine, often times the Jackpot Key will be strapped with the main slot machine door key. It is a small key as pictured below.
• Take the key in hand and locate the jackpot reset which is a keyhole located on the right side of the slot machine. It is normally about two-thirds up from the bottom of the machine.

• Insert the Jackpot Reset Key into the keyhole. Turn the key only one quarter turn to the right. This will reset the machine, and once you close the main slot machine door, you will be ready to resume play.
• Note that if you turn the Jackpot reset key multiple times you may place your slot machine into a test mode and will thus delay your ability to continue playing.

Some of the Error Codes you get on Slot Machine

Error Code 3300 (IGT S+ Machines)

Simply put Error Code 3300 is normally telling you your hopper is low on or completely out of coins or tokens.

Open the main slot machine door. Look into the hopper. If it is empty or has just a few coins or tokens, place about 500 coins or tokens back into the hopper. Close the main slot machine door. In a few moments you should hear the sound of the hopper’s motor turning and soon the remaining coin payout will begin.

Error Code 3100 (IGT S+ Machines)

Error Code 3100 (Extra Coin Out Tilt) normally signifies either a jammed/stuck coin or token in the coin-out chute on the hopper, or the hopper coin-out sensor has detected the hopper may have paid out an extra coin.

• Open the main slot machine door. Remove the coin tray by lifting up and pulling out the tray. Simply pull it out and down to remove the tray.
• The hopper is on the bottom floor of the machine and slides out on two base rails along two metal guides. Slide the hopper out slowly by grasping the handle with your left hand and supporting the hopper with your right hand. Do not use the black hopper bowl to pull the hopper out of the slot machine.
• Inspect the hopper to determine if any coins/tokens appear to stuck or jammed in the hopper knife or the hopper coin-out channel.
• If a coin appears to be stuck or jammed, empty the hopper of coins/tokens for easier access to clearing the jammed coin/token.
• Once the stuck or jammed coin has been removed, place the hopper back into the slot machine making sure it slides in easily and completely with the base rails on hopper guides on the bottom of the machine. The hopper plugs into a receptacle toward the back of the machine. It is designed to fit in easily without using excessive force
• Refill the hopper with the proper size coins or tokens. The coin tray can be easily put back into place by ensuring the alignment pins on the coin tray match up to the top alignment holes on the bottom side of the machine. The tray should be pushed down into place. Make sure the tray is even when pushed into place. If the coin tray is not aligned and even, remove the coin tray, and repeat the procedure.
• Close the main slot machine door. The error code should be gone and the machine is ready to play.

Error Code 12 (IGT S+ Machines)

The 3.6 volt battery on the slot machine CPU Board normally lasts for years. However when an Error Code 12 is displayed, this is an indication the battery voltage has dropped below 2.9 volts and is now a low battery.

It is recommended to replace the battery as soon as possible. They can be purchased online from ebay, amazon or realslotmachinesforsale. When ordering a replacement battery, they will provide you with detailed instructions on how to change this battery which is located on the slot machine’s CPU Board.

In order to reset Error Code 12 temporarily, simply open and close the main slot machine door. It is important not to wait for a long time to replace the battery as data stored on the RAM may be lost. Replace the battery Asap.

Following are some of the other error codes that might interest you to solve your problem in repairing the slot machine

Hopper is Full and Coins Go Down a Chute to Bottom of Machine

Slot machines that accept coins were designed this way because when used constantly on the casino floor, hoppers could quickly fill. There is a coin level probe on side of the hopper that looks like a brass screw sticking inward toward the hopper bowl. This probe detects when coins/tokens are at a selected level, and will cause the subsequent coins/tokens played to go down a chute to the bottom of the slot machine.

Provided your slot machine sets on a regular casino slot machine stand with holes in the top and the holes are aligned with the slot machine, those coins which bypassed the hopper will go down the chute, through the hole in the bottom of the machine, through the hole in the top of the stand, and into the open area in the stand cabinet. As casinos have done for years, place a small plastic tub in the slot machine stand cabinet to collect these excess coins. Gothel rapunzel slot machine.

Retrieving Currency from the Cash Box

Though not all slot machines are equipped to accept currency in order to comply with certain laws but if your slot machine is equipped with a bill acceptor, bill transport and cash box, the bills in the cash box can easily be retrieved.

• Open the slot machine main door. The cash box door is located just under the yellow chute for the bill acceptor. Ensure the cash box door is fully open.
• On the right side of the cash box toward the top is a release level. Push release lever down and pull the cash box straight out toward you. If the cash box seems difficult or impossible to pull out, make sure you have pushed the release lever down.

• Hold the cash box in both hands and turn it upside down. Notice on the bottom of the cash box is a door which has two small finger sized holes on one side. Normally the door is held closed by a small piece of electrical tape so the bottom cash box door doesn’t come open while removing it from the cash box chassis of the slot machine.
• While holding the cash box with the bottom door up toward you, open the door and you will see where the bills are stored. The large spring expands as more and more bills are added to the cash box. Remove the bills by pulling them straight out.
• Close the bottom door of the cash box and re-secure the door using the same small piece of electrical tape. Turn the cash box around to the original position when you removed it from the slot machine.
• Align the flat top of the cash box with the flat surface at the top of the cash box chassis from which you removed it. Slide it firmly into place. Now close the cash box door and the main slot machine door and you are ready to use it for gaming.

All the content, graphics and videos in this post have been gathered by research for you from various online sources and hope this helps you as a guide to repair your slot machines. Note that many guide books and manuals too are there for you to buy from online stores which are handy to know as how to repair your slot machines. Just stay tuned at realslotmachinesforsale and know many more interesting information about slot machines.

You can play a slot machine in Las Vegas before you’ve even reached baggage claim: there are tiny slots parlors in every terminal of McCarran International Airport. Once you pick up your rental car, you can stop for gas and play slots at a convenience store. And that’s all before you’ve even reached your hotel-casino, which — if it follows the modern standard — dedicates roughly 80 percent of its gaming floor to slots, and only 20 percent to table games.

Bally Technologies, one of the world’s largest manufacturers of slot machines, is headquartered 3 miles south of the Strip. When I visited Bally in mid-March, Mike Trask, the company’s senior marketing manager, walked me into the company’s showroom to play some games. Compared to the cacophony of a casino floor, Bally’s showroom was practically monastic, the lights low and the room silent apart from the soothing hum of two dozen hibernating consoles.

Trask, a tall man in his 30s with dirty-blond hair, showed me the company’s new Friends-themed game, installed on Bally’s ProWave cabinet, a slick, 42-inch curved console. Friends celebrated its 20th anniversary last year, and the company hopes to tap some of that nostalgia. 'That person, that girl who watched every episode of Friends when it came out, is our demographic,' Trask said, standing alongside the cabinet.

I took a seat in front of the unit, and Trask touched a logo on the display’s upper corner, selected a box on the display that ensured I would get a bonus round, and told me to hit the spin button. I did, and a pared down version of the show’s theme song played, the NBC sextet smiled at me from the prime of their youth, and five reels of symbols — a Central Perk decal, a guitar, screenshots of characters — scrolled down the screen. The Wheel of Fortune-style bonus round featured a clip of Rachel saying, 'Happy birthday, Grandma!' wearing a wedding dress.

Bally assembles all of its machines in a factory warehouse next to its game studios and tucked behind its Vegas corporate headquarters. Last year, Scientific Games, Bally’s parent company, shipped out more than 17,000 new units. On my visit, hundreds of freshly assembled slot machine shells, featuring the industry standard black exterior and jutting dashboards, lined the warehouse walls.

A tag attached to each cabinet indicated its destination: Oklahoma, Washington, Michigan, Canada. Only a handful were destined for Vegas casinos, a sign of gaming’s national and international expansion. Scientific Games acquired Bally last year for $5 billion. At the time, 23 states had legalized gambling, a heavily taxable industry, to quickly infuse deficient coffers.

But the expansion of gaming generally is the expansion of slot machines specifically — the modern casino typically earns 70 to 80 percent of its revenue from slots, a stratospheric rise from the 1970s when slots comprised 50 percent or less. New York, the latest state to introduce gaming, doesn’t even allow table games, and Pennsylvania, now the third-largest gaming state in the country after Nevada and New Jersey, only later allowed table games in an amendment to its legislation. And increasingly, the psychological and technical systems originally built for slot machines — including reward schedules and tracking systems — have found admirers in Silicon Valley.

In the factory, Trask and I passed a ProWave cabinet, a design released by Bally in mid-2014 that features a 32-inch concave screen, like an even more curved Samsung TV. Trask claimed that putting the same exact games on curved screens increased gameplay 30-80 percent. I asked him why that was. 'It looks cool; it’s incredibly clear,' he said in a tone suggesting a guess as good as any. Game designers are charged with somehow summoning the ineffable allure of electronic spectacle — developing a system that is both simple and endlessly engaging, a machine to pull and trap players into a finely tuned cycle of risk and reward that keeps them glued to the seat for hours, their pockets slowly but inevitably emptying. As we stood over the gaming cabinet, Trask told me about the floor of the MGM, home to 2,500 machines and hundreds of different games. Trask’s mission, as he saw it, was simple: 'Our job is to get you to choose our game.'

The prototypical slot machine was invented in Brooklyn in the mid-1800s — it was a cash register-sized contraption and used actual playing cards. Inserting a nickel and pressing a lever randomized the cards in the small display window, and depending on the poker hand that appeared, a player could win items from the establishment that housed the machine. In 1898, Charles Fey developed the poker machine into the Liberty Bell machine, the first true slot with three reels and a coin payout. Each reel had 10 symbols, giving players a 1-in-1,000 chance of hitting the 50-cent jackpot if three Liberty Bells lined up. The three-reel design was a hit in bars and became a casino standard, but for decades gaming houses considered them little more than a frivolity — distractions for the wives of table-game players. Accordingly, casinos were dense with table games, and slots were relegated to the periphery.

That began to change in the 1960s, when Bally introduced the electromechanical slot machine. The new rig let players insert multiple coins on a single bet, and machines could multiply jackpots as well as offer up smaller, but more frequent wins. Multi-line play was introduced: alongside the classic horizontal lineup, players could now win with diagonal and zig-zagged combinations. The new designs sped up gameplay and breathed life into the stagnating industry.

William 'Si' Redd, the bolo tie-wearing Mississippi native who oversaw some of Bally’s new projects during the era, was instrumental to that renaissance. 'The player came to win,' he said, 'he didn’t come to lose, [so] speed it up, give him more, be more liberal. Let him win more, but then [you make money] still with the speeding up, because it was extra liberal.' In other words, the new machines lowered slots’ volatility — gaming parlance for the frequency at which a player experiences big wins and losses.

The casino floor of the Boulder Club, early 1950s. Image courtesy of the University of Nevada, Las Vegas

In the 1970s, Redd left Bally and founded another gaming manufacturer that was later renamed IGT. IGT specialized in video gambling machines, or video poker. Video poker machines could be designed to have even lower volatility, paying players back small amounts on more hands. And video poker’s interactive elements made them extra engrossing, turning them into an enormous success: people lined up to play the first machines, and the game’s ability to command a player’s complete concentration for hours gave it a reputation as the 'crack cocaine' of gambling.

'If you were to take $100 and play slots, you’d get about an hour of play, but video poker was designed to give you two hours of play for that same $100,' Redd said at the time, instructing game designers to lengthen the time it took a poker machine to consume a player’s money.

Redd also acquired the patent for the newly created Random Number Generator, which computerized the odds-calculator behind the spinning reels and allowed game makers to control volatility. A modern slot machine, at its core, is nothing more than an RNG going through millions or billions of numbers at all times. When a player hits a spin button, they are simply stopping the RNG at a particular moment. Everything beyond that — the music, the mini-games, the actual appearance of spinning reels, Rachel, Monica, and the rest of the gang keeping you company — is window dressing to keep you hitting spin.

IGT now makes 93 percent of the world’s video poker machines and is the largest manufacturer of video slots in the world. Its Wheel of Fortune franchise spans every kind of slot machine — reels, curved screens, and massive installations with enormous physical flourishes. On my visit to their Las Vegas offices, I asked Jacob Lanning, IGT’s vice president of product management, what makes a good game. 'If you can figure that out, you’ve got a job,' he said. Trask had told me something similar: 'If we knew what the perfect game was, we’d just keep making that game over and over.'

Perhaps no one has uncovered the Platonic ideal of the slot machine, but certain principles undergird most games. First, there’s a vague aesthetic uniformity: colors tend toward the primary or pastel, franchise tie-ins are a must, and the game soundtracks are typically in a major key. Meanwhile, the multi-line wins introduced by Bally have become an unintelligible tangle: modern slots offer players upwards of 50 and sometimes 100 different winning combinations — so many that without the corresponding lights, sounds, and celebration, most casual and even advanced players would have trouble recognizing whether they’d won or lost.

To keep players gambling, all slots rely on the same basic psychological principles discovered by B.F. Skinner in the 1960s. Skinner is famous for an experiment in which he put pigeons in a box that gave them a pellet of food when they pressed a lever. But when Skinner altered the box so that pellets came out on random presses — a system dubbed variable ratio enforcement — the pigeons pressed the lever more often. Thus was born the Skinner box, which Skinner himself likened to a slot machine.

The Skinner box works by blending tension and release — the absence of a pellet after the lever is pressed creates expectation that finds release via reward. Too little reward and the animal becomes frustrated and stops trying; too much and it won’t push the lever as often.

Like video poker, most multi-line slots rarely pay large jackpots, instead doling out smaller wins frequently. 'They’re imitating the formula of video poker, but they’re doing it in a slot formula,' Natasha Schüll, an associate professor at MIT who has researched slots for 15 years, says. In 2012, Princeton University Press published Addiction by Design: Machine Gaming in Las Vegas, the culmination of her research and a deconstruction of the slot machine.

Schüll says modern slot machines essentially continued the trend started by Redd so as not to jolt players too intensely in the form of losses — or wins. 'Too-big wins have been shown to stop play because it’s such an intense shift in the situation that you’ll kind of pause, you’ll stop, you’ll take your money and leave,' says Schüll. Stretching out gameplay with minor rewards, Schüll says, 'allows you to get in the flow of, another little win, another little win.'

As a result, modern slots pay out on approximately 45 percent of all spins, instead of the 3 percent of traditional slots. 'The sense of risk is completely dampened,' Schüll says. 'Designers call them drip feed games.'

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That analysis is supported by a 2010 American Gaming Association white paper. 'Lower-volatility games often have greater appeal in 'locals markets' than in destination resort markets like Las Vegas or Atlantic City…Customers tend to play these games for longer periods of time…' In other words, lower volatility games paved the way for gaming’s wild expansion nationwide.

The advent of bonus games has also helped bolster slot machines’ popularity: instead of just winning money, certain combinations can trigger mini games. In the IGT showroom, Lanning showed me the company’s forthcoming Entourage game, in which a bonus game has the player match portraits of characters. In the industry, it’s called a pick-em bonus. 'Those are the most popular features,' Melissa Price, the senior vice president of gaming for Caesar’s Entertainment, told me. 'Customers enjoy ‘perceived skill’ experience.'

And then, there’s the emotional appeal: Price told me the company commissioned a study to find out why people love the Wheel of Fortune line so much. 'People said it was as much about the brand as anything,' she said. 'People said, ‘That brand — I used to hear it in the living room at my grandma’s house, I’d hear that wheel spinning because my grandma watched it. It reminds me of my grandma.’ I mean, how can you compete with that?'

Price and I spoke on the floor of Harrah’s Las Vegas at 9:00AM — the slots players were already at their machines, or perhaps they’d been there all night. Last year, Harrah’s parent company, Caesar’s Entertainment, declared bankruptcy as a consequence of overextension and growing competition. During proceedings, creditors appraised Caesar’s vast store of customer data as the company’s most valuable asset, worth about $1 billion.

Harrah’s pioneered the now industry standard Total Rewards player tracking system, first with a punchcard program introduced in 1985, then with a digital program and magnetic cards in the 1990s. Slots were easy to track, and stood at the very center of the program. The system grew even more sophisticated under the auspices of former CEO Gary Loveman. Loveman arrived at Harrah’s fresh from teaching at Harvard Business School, and he brought a methodical business savvy to an industry that, in many ways, had spent decades winging it.

Before the tracking system, the player management was as sophisticated as watching which players spent a lot of money and comping amenities to encourage them to spend more. 'We all looked around and said, there’s got to be a more automated way to do that,' said Price.

Price and I stood behind a woman playing IGT’s Ellen Degeneres game. Ellen’s head whizzed down the reels on the parabolic display in high definition. As long as the player had her Total Rewards card inserted in the machine, every time she hit the spin button the system recorded the size of her bet, what game it was spent on, at what time, how long she’d been playing for, and so on, until she hits the 'Cash Out' button on the machine, at which point all the data is encapsulated in her file, along with all the other games she has ever played at a Caesar’s casino.

Player tracking systems revealed more than a pit boss ever could: over time, Harrah’s can create a portrait of the person’s risk profile, including how much money a player typically loses before they stop playing and what kinds of gifts to give them to keep them on the gaming floor. Sometimes, that can be a penthouse suite; other times, it can be as little as giving a player $15 in cash. In 2012, This American Life charted the lurid and unsettling extreme of how these systems can be used in a story about a Harrah’s in Indiana that enticed a woman to keep playing with unlimited hotel suites, diamond jewelry, and free trips to the Kentucky Derby. The perks fueled her gaming habit until she was $125,000 in debt.

Every casino today has a form of the data system invented at Harrah’s — most of them are now built by Bally. 'We are the envy of probably every consumer products industry out there because of the amount of data that we really have on our players,' said Price. Newer systems can even visualize heat maps of casino activity — an operator can see precisely how much is being spent in a specific time period in localized areas.

Claim: According to official data, slots account for more casino revenue than any other gambling game. The home of Atlantic City has seen casinos close as its casino revenue has dropped from $5.2 million in 2006 to $2.5 million in 2015. New Jersey legalized online gambling in 2013 after the. https://ninbright.netlify.app/percentage-of-casino-revenue-generated-by-slot-machines.html. Slot machines at a casino in Atlantic City, New Jersey Gambling in the United States is legally restricted. In 2008, gambling activities generated gross revenues (the difference between the total amounts wagered minus the funds or 'winnings' returned to the players) of $92.27 billion in the United States.

The data also vindicates Redd’s approach: the small slots customer, over a lifetime of spending, is just as valuable as the high roller. 'The slot player was the forgotten customer,' Loveman told Bloomberg BusinessWeek in 2010. 'I had to be willing to be unsexy in this,' Loveman added. 'I can take you to a casino that would have a lot of young beautiful people in there and you would say, ‘Man, this is a happening place.’ I could take you to another place where there are a lot of people who look like your parents. The latter would be a lot more profitable than the former. My job is to make the latter.'

After my trip to Vegas, I visited the Sugarhouse casino in Philadelphia, on the bank of the Delaware River. Sugarhouse opened in 2010 and is one of 12 casinos that turned Pennsylvania into a gaming powerhouse after legalization in 2004. The casino’s interior — clear passageways, a clean line of sight from the eastern to western walls — brimmed with activity on a Tuesday evening. Sugarhouse squealed with the cacophony of slots and the saccharine melodies sounded like a thousand robots blowing bubbles. (The slot manufacturer Silicon Gaming decided at one point that soundtracks in the key of C were the most agreeable.)

In 11 years of legalized gaming, the state has earned $3 billion from table games and $17 billion from slots. Table players at Sugarhouse made their wagers at an island amidst an ocean of slots. As I made my way through the casino, I struck up a conversation with two slot players: Diane Singleton, a 45-year-old retiree; and Jack, who refused have his last name published. The two were playing Fu Dao Le, whose theme can only be described as Cherubic Chinese Babies. The game was loaded onto a ProWave cabinet, and a red cursive Bally logo hung in the upper right corner of the screen.

I asked what they enjoyed about the game. Jack said that unlike other games, Fu Dao Le is 'highly interactive.' He likes the game’s 'kooky stuff; you can touch the display,' he said, touching the image of cherubic babies above the reels, causing them to laugh with a Pillsbury Doughboy-like giggle.

Jack and Singleton say they’ve both earned 'Black Cards' through Sugarhouse’s player tracking system, meaning they’ve each spent more than $10,000 here. Jack says the casino has comped them four cruises so far; Singleton says she threw her card away because it reminded her of how much money she’d spent. I had more questions, but at a certain point it became apparent that Singleton was no longer listening.

'She’s in the zone right now,' said Jack.

The 'zone' is at the core of Schüll’s theory about the success and proliferation of slot machines. She heard the term over and over again in her 15 years of research — the players repeatedly told her that they played to zone out, to escape thought.

To understand the zone, you first have to understand 'flow,' the concept developed by Hungarian psychologist Mihaly Csikszentmihalyi to describe a hyperfocused state of absorption. During 'flow,' time speeds up (hours feel like minutes) or slows down (reactions can be made instantly) and the mind reaches a state of almost euphoric equilibrium. Schüll, in her book, describes Csikszentmihaly’s four criteria of flow: '[F]irst, each moment of the activity must have a little goal; second, the rules for attaining that goal must be clear; third, the activity must give immediate feedback; fourth, the tasks of the activity must be matched with challenge.' For most of their history, slots easily fulfilled the first two criteria; after lowering volatility, they fulfilled the third criterion, and with the introduction of multiple lines, endless bonus rounds, and the occasional mini-game, they finally fulfilled the four criteria.

The 'zone' is flow through a lens darkly: hyperfocused, neurotransmitters abuzz, but directed toward a numbness with no goal in particular. When Singleton emerged from the zone, I asked her again why she found the slots so compelling. 'I lost my husband two years ago to throat cancer,' she explained. 'He was the love of my life, and I started doing this just to — I was out of my mind and spent a lot of time at the cancer center.' Jack had lost his son to pancreatic cancer. As they told their stories, Jack and Singleton hit the spin buttons and the machines blared so loudly that their words were lost in the noise.

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Singleton says she never recovered from the pain of her loss, and that’s why she keeps coming back to the slots. Jack echoed that sentiment: 'I don’t have to think. And I know I can’t win.'

'Right, so you know that,' said Singleton.

'Every now and then…you get something,' Jack agreed.

'But it’s never what you lost.'

'Because I don’t care whether I win 38 cents or 600 dollars.'

'You just want to see them again.'

Singleton rifled through her wallet filled with $100 bills. 'I’ll be right back, guys,' she said, and went off to get change.

Back at the Bally showroom, Trask and I had sat in front of the company’s new Duck Dynasty game. 'There’s never been more slot machines in the world than there are today,' he said. 'And that’s proliferation not just in the US, but abroad.' His hand rested on the game’s display, his index finger next to a reel symbol of a cast member sticking his tongue out and playing air guitar. Scientific Games’ market now includes 50 countries on six continents. This spring, the company announced it was planning on providing 5,000 of the 16,500 machines recently authorized in Greece.

The industry is also preparing for the eventual deterioration of its key middle-aged demographic and competition from free-to-play mobile games. 'People only have so much leisure time and there’s a lot of activity on iPhones,' Price told me. At one point in the Bally’s warehouse, Trask said, 'You know how you get people younger to gamble? Hand them a fucking telephone.'

The industry seems to be working on the same hunch. In 2011, Caesar’s acquired Playtika, an online casino games company that offers free and paid mobile games. A year later, IGT acquired the free casino games app DoubleDown, which runs as both a stand-alone mobile app and through Facebook. The company now offers online table games and a good sample of its portfolio of slots, including Wheel of Fortune, to mobile players. Earlier this year, the gaming giant appointed former Zynga studio manager Jim Veevart as DoubleDown’s vice president of games. And last year, Churchill Downs Incorporated, which runs seven casinos in addition to its Kentucky Derby racetrack, acquired the free games company Big Fish Games.

Meanwhile, the tech sector is adopting the principles of slot design for its own purposes. In the early aughts, the tech writer Julian Dibbell devised the concept of ludocapitalism, a term inspired by watching World of Warcraft players mine gold in the game to making a living in real life. Ludocapitalism was an attempt to explain the growing gamification of society through technology. Dibbell admits the concept’s parameters are vague, but at its most basic it identifies that capitalism can harness the human play drive for better or worse — and that increasingly, games aren’t allegories that say something about our lives; they are our lives. As people move toward more Schüll says. Writing in The Atlantic, Alexis Madrigal tapped Schüll’s concept of the ludic loop to explain the inextricable entrancement of flipping through Facebook photos: you push a button over and over, primed for an eternally fleeting informational reward.

A more exact replica of a slot may be Tinder. The mechanics of the dating app mirror the experience of playing slots: the quick swiping results in an intermittent reward of connection, followed by the option to either message your potential date or 'Keep playing.' Tinder recently launched a premium version that allows the user to undo an accidental 'not interested' swipe, essentially monetizing mistakes made while in the automatic rhythm of the zone.

'I can’t tell you how often I’ve been approached since the publication of my book by Silicon Valley types who say things like, ‘Wow, the gambling industry really seems to have a handle on this attention retention problem that we’re all facing,' Schüll told me. 'Will you come tell our designers how to do a better job?’'

Last year, Schüll heard from Nir Eyal, a tech entrepreneur who founded and sold two startup companies that produce advertisements in free-to-play games. '[Eyal] showed me his copy of my book, and it had, like, hundreds of hot pink sticky notes coming out of it,' she told me. In his 2014 book Hooked: How to Build Habit Forming Products, Eyal laid out his 'Hook Model' of product development that works on basic behaviorist principles: a trigger turns into an action turns into a variable reward turns into a further personal investment back into the product. Last year, he invited Schüll to speak at his Habit Summit, hosted at Stanford. Schüll gave a talk on the 'dark side of habits,' placing slot machines on the undesirable end of the habit spectrum.

Eyal told me he invited Schüll to offer a less self-congratulatory, 'rah-rah' voice to the conference. Although the conference focused on how to build habit-forming tech products, 'These techniques — they have a dark side,' he said. 'If not used appropriately, or if used for nefarious purposes, then they don’t always benefit the user.'

Still, it was difficult to determine whether Schüll’s slot research has been received as a warning or a how-to guide within tech. Eyal criticized slot machines for what he said was a business model dependent on addicted players — 'that industry, I have a problem with,' he said. But Hooked is in many ways tech’s version of Addiction by Design: his model of successful product design is a loop going from 'trigger' to 'action' to 'variable reward' to 'investment' and back again. In his trigger section, Eyal uses Instagram to illustrate how emotional pain can be a powerful motivator to use a product — in that app’s case, the mostly insubstantial pain of lost memories. He writes, 'As product designers it is our goal to solve these problems and eliminate pain…users who find a product that alleviates their pain will form strong, positive associations with the product over time.'

I asked Eyal what distinguishes mobile games or dating apps from slot machines. He gave a range of answers that sounded at once comprehensive and somewhat defensive — that tech addictions never really plummet to the league of gambling addiction; that people prone to addiction will be addicted no matter what — before finally admitting that, in a sense, everything functions like a slot machine.

'All content needs to be made interesting. What you’re doing as a writer is introducing variable rewards into your story. Everything that engages us, all pieces of content are engineered to be interesting,' he said. 'Movies aren’t real life, books aren’t real life, your article isn’t real life. It’s manufactured to pull us one sentence after another through mystery, through the unknown. It’s a slot machine. Your article is a slot machine. It has to be variable. So just because an experience introduces variability and mystery — that’s good!'

'I think the answer is, it’s okay to addict people as long as your business model doesn’t depend on it,' he said, as if finally finding the answer to a problem that had long seemed without a solution. 'That’s the answer,' he added. 'That’s the answer.'

Correction: a previous version of this article stated that modern slots have a 45 percent payback rate. In fact, they pay out on approximately 45 percent of all spins. In addition Nir Eyal's Hooked was published in 2014, not 2003.

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Edited by Michael Zelenko