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.
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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.
Paper Slot Holder
- 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)
Kimewaza Slot Holder
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
CODE | DESCRIPTION | PROBLEM |
12 | Low Battery | Battery voltage on processor board has dropped below 2.9 volts DC |
21 | Coin-In Tilt | Optic coin-in sensors were blocked |
3100 | Extra Coin Out | Stuck/jammed coin in hopper or optic sensor detects extra coin paid |
3200 | Coin-Out Tilt | Hopper coin-out sensor was blocked |
3300 | Hopper Empty | Hopper coin-out sensor sensor detects no coins were dispensed for 8 seconds or more. Hopper needs to be refilled with coins/tokens. |
41 | Reel #1 | Tilt Designated reel is misaligned or malfunctioning |
42 | Reel # 2 Tilt | Designated reel is misaligned or malfunctioning |
43 | Reel #3 | Tilt Designated reel is misaligned or malfunctioning |
44 | Reel #4 | Tilt Designated reel is misaligned or malfunctioning |
45 | Reel #5 Tilt | Designated reel is misaligned or malfunctioning |
49 | Reel Mechanism Disconnected | A reel mechanism has become unplugged or the circuit is interrupted |
61 | CMOS RAM | Bad CMOS RAM data or data was cleared |
62-0 | Bad Game EPROM | Game program or data program check |
62-1 | Bad Data EPROM | Bad EPROM data |
63 | Processor Tray Open | Main processor door has been opened and closed since last game played |
65-0 | Bad EEPROM Device | Processor could not successfully read from or write to chip |
65-1 | Bad EEPROM Data | Data is invalid or corrupted |
65-2 | Game Type Mismatch | Game data om CMOS RAM does not match game data in EEPROM |
66 | Game EPROM Changed | Machine senses the game EPROM has been changed |
67 | Data EPROM Changed | Machine senses the data EPROM has been changed |
68 | Non-Compatible Data EPROM | Data EPROM is not a standard file |
99-1 | Bill Validator | Stacker jam |
99-2 | Bill Validator | Cash box removed |
99-4 | Bill Validator | Cash box full |
99-5 | Bill Validator | Hardware error |
99-6 | Bill Validator | Reverse bill detected |
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.
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.
Return to player (RTP) is one of the most-important concepts to slots players. Payback determines how much the average player wins from a slot machine.
A slots game with 95% RTP, for example, would theoretically deliver $0.95 back for every $1 wagered. A slot machine with 88% payback would only offer $0.88 for each dollar wagered.
Gamblers want to know slots’ RTP for obvious reasons. Knowing a machine’s payout percentage provides an indication on your long-term odds of winning.
But one of the most-common fears is that casinos can simply change slots odds whenever they feel like it. Many gamblers are convinced that casinos alter RTP for a variety of reasons, whether it’s to lower payback during busy hours or simply earn more overall profits.
This fear seems valid when considering that players don’t see the inner workings of slot machines. But are casinos really able to alter payback on a whim?
I’m going to discuss this matter by looking at how casinos change RTP, common beliefs on the subject and casino limitations in controlling payback.
Slot machine RTP is determined by the pay table and how often each prize is programmed to hit.
The pay schedule shows how many credits each symbol combination delivers. The pay table only tells so much, though, and doesn’t show how often each payout is programmed hit.
Each symbol features a certain number of “stops,” which determine how often it’ll land on the reels. Low-paying icons are always programmed with more stops than high-paying symbols.This aspect makes perfect sense when considering that casinos would lose money if they showered you with the jackpot and other large payouts. Instead, games offer lots of smaller prizes and rarely pay the jackpot.
A random number generator (RNG) ultimately determines which symbol combinations come up on each spin. Contrary to common opinion, the RNG does not determine payback.
Instead, this program merely cycles through different symbol combinations to determine the results of your spin. The RNG is more likely to include symbols that have a higher number of stops.
An RNG has no recollection of what happens on your previous spins. Instead, its main job is to come up with random results.
Again, icons with many stops will be chosen by the RNG more frequently than other symbols.
Casinos don’t need to worry about programming payout percentages — this is the game developer’s job. Instead, they simply consider what RTP they want to order for a given game.
Providers give land-based casinos a number of options to choose from when ordering payback.
Here’s an example:
- MGM Grand wants to order Aristocrat’s Game of Thrones.
- Aristocrat offers RTP choices of 88.0%, 90.0%, 92.0%, and 94.0%.
- MGM selects the version with 92.0% payback.
Online slots developers usually offer a uniform RTP for any game that they produce. Internet casinos that license their slots are then forced to use the provider’s chosen payout percentage.
But a minority of online slots providers do let casinos choose from preset RTP amounts (covered later).
How casinos change payout percentages depends upon the style of game. Payback for most land-based slot machines is determined by the EPROM chip located inside.
A gambling establishment can alter a machine’s RTP as long as they have the EPROM chip, which is sometimes the case. Theoretically, any casino that has these chips can change payback whenever they like.
The catch, though, is that many gambling jurisdictions require the casinos to report when they alter a game’s RTP. This process requires that a casino manager spends time filling out paperwork.
Some slot machines operate on downloadable software, which comes from a central server. In these cases, the casino doesn’t have to open a game and change a chip.
Instead, they can simply download the software to alter RTP. But just as with replacing an EPROM chip, casinos need to follow their jurisdiction’s guidelines when changing server-based payout percentages.
For starters, gambling venues can’t make these changes when somebody is playing a machine. Furthermore, they have to wait a certain amount of time before altering any game settings.
What’s the Common Belief about Casinos Changing Slots Payback?
Some slots players believe that casino owners and management can change RTP across the board by simply flipping a switch. This theory has been furthered propelled bythe rise of video slots.
Very few land-based slot machines operate on mechanical reels and levers these days. Instead, casinos mainly feature video slots that run through software programs.
Of course, gamblers’ fears are only magnified when dealing with online casinos. These websites are headquartered far away from most players, leading to concerns that internet casinos can do anything they want to slots payback without anybody knowing.
But what else beyond suspected greed leads players to believe that casinos will cheat them through lower RTP?
A driving force behind conspiracy theories is how slot machines are the streakiest casino game. Most slots only see players win around 20-40% of their spins, even with every payline activated.
Such low hit frequency leads gamblers to experience long losing streaks. In turn, these cold streaks cause players to theorize that casinos have changed RTP.
Card Slot Holder
What’s the Real Story Behind Casinos’ Ability to Alter RTP?
Contrary to what some players believe, casinos don’t simply alter payout percentages whenever they feel like winning more money. Instead, gambling venues must go through the proper channels.
Earlier I covered how many jurisdictions require casinos to submit paperwork before changing the EPROM chip inside a slot machine.
Not only does an important employee waste time filling out paperwork and sending it to the local gambling control commission, but the casino must also pay for another EPROM chip. These chips are expensive, meaning it’s not economically viable to continue changing RTP.
Of course, server-based slot machines can be altered faster without opening machines. But there are deterrents from doing this as well.
Some Las Vegas slot machines are so popular that they have people standing off to the side waiting to play. Therefore, casinos can’t change RTP for these games until things slow down in the middle of the night.
More importantly, gambling establishments don’t like tying up games and preventing people from playing. This creates another situation where it doesn’t make economic sense to put games down for maintenance just to constantly change payback.
Casino employees’ time is valuable, especially with regard to managers. It would be a waste of resources and manpower to alter RTP from machine to machine.
Of course, none of this subsides fears that online casinos can change payout percentages as they please. But gaming sites face roadblocks in this regard too.
In fewer cases, online casinos can choose from different RTP options just like land-based establishments. Realtime Gaming (RTG) commonly does this by offering their clients payout percentages ranging from 91.0% to 97.5%.
Casinos must decide on the chosen payback when ordering a certain game. They can’t, however, ask RTG to change payout percentages back and forth every day.
RTG allows gaming sites to choose from different payout percentages due to the various bonuses offered through their software setup. RTG offers total casino packages where they handle the bonuses, games, and more. Clients have some flexibility here and can either choose high bonuses with low slots RTP or vice versa.
In any case, you can see that there’s nothing nefarious going on with the average online casino and game provider. This is especially true when considering that many slots developers and casinos undergo third-party auditing to ensure that their games offer fair and random results.
Is there Any Truth to the Idea That Casinos Can Change Payback with a Switch?
Earlier I mentioned how some players believe that casinos can merely flip a switch to change all of their slot machines’ RTP.
I dismiss this idea, because casinos need to go through the proper channels to change payback. But is there any shred of truth to the switch-flipping concept?
A 2006 New York Times piece offers evidence that it’s possible for casinos to quickly change RTP for many different games.
This article revolves around a Treasure Island casino executive named Justin Beltram, who discusses how his casino was undergoing a technology experiment at the time.
The piece reads that “with a few clicks of his mouse” Beltram can reprogram the “denominations required to play, payback percentages, even game themes” for all of Treasure Island’s 1,790 slot machines.
Much of the article deals with how easy it is to change settings in server-based slots versus the EPROM-chip games. Beltram notes that he could change a game’s settings within “20 seconds” using this technology, compared to the lengthy and complicated process of opening machines to alter settings.
The executive also squashed the notion that his casino would abuse this power to win more money from players. Beltram insists that such practices would be bad for business and possibly lead to trouble with gaming regulators.
David G. Schwartz, director for UNLV’s Center for Gaming Research, did express concerns about casinos changing payback through servers. “Let’s say you’re playing at 2 and you’re doing great and you come back at 6 and the pay tables have changed,” explains Schwartz.
While this is a valid concern, lowering odds and causing players to lose more is counterproductive to business. Nobody wants to play at a casino where they think that the odds are stacked against them.
Beltram notes that the goal of server-based slot machines is all about quickly catering to players’ demands. He told a story about a high roller who wanted to play a $25 Double Diamond machine. This game didn’t have server technology, forcing Treasure Island to order the chip from IGT and quickly replace the coin denomination before the high roller could begin playing.
Overall, the article suggests that while it’s possible for casinos to quickly change slots payback with server technology, this concept is more about meeting customer demands than anything.
Long story short, casino managers don’t have time to sit in their back office and switch RTP every time that they see somebody winning. Casinos already have the edge over players, and it’s not worth the time or repercussions to con gamblers.
The thought that casinos instantaneously change all of their slots payback is only one misbelief regarding the subject. Here are a few more myths surrounding how casinos handle slots RTP.
Slots Payback Happens on a Cycle
Some gamblers are convinced that slots payout percentages happen on a cycle. This idea stems from the belief that slot machines are programmed to offer payouts at specific intervals.
Here’s an example of how one might conceptualize this:
- Jackpot pays exactly once every 1 million spins.
- 1,000-coin prize pays every 250,000 spins.
- 500-coin prize pays every 50,000 spins.
- 100-coin prize pays every 10,000 spins.
- 50-coin prize pays every 5,000 spins.
- 5-coin prize pays every 50 spins.
- 1-coin prize pays every 10 spins.
Players who believe that slot machines work like this often think that they can win a jackpot by playing at the right point. They look for a jackpot that hasn’t been won in a while and start playing in hopes that the game is nearing the end of its payout cycle.
But slots results are determined by an RNG, which has no recollection of previous payouts and merely continues generating random results.
Jackpots and other payouts are programmed with specific odds. Certain jackpots may very well be programmed to pay every 1 million spins on average.
But the key is that this prize doesn’t have to pay out after exactly 1 million rounds. Instead, the jackpot can hit at 500k spins or 2 million spins.
Casinos Change RTP during the Day and Night
Another common slots myth is that casinos alter payout percentages throughout the day. This theory is based on the logic that slot machines are more generous during the less-busy day hours and tighter during the busier evening hours.
It makes sense to believe that casinos would tighten payback when they have more slots customers. Doing so would enable them to earn far more profits.
If a slot has a 5% house edge, this means that casinos are winning a nickel for every dollar wagered by players. Assuming a gambler bets $600 per hour, the casino is making $30 on average (600 x 0.05).

The last thing a gambling establishment wants to do is lower payback and discourage people from playing during busy hours.

Many gamblers already become suspicious that payback has changed when they go through cold streaks. Casinos don’t want to add fuel to this fire by actually altering RTP just to increase an advantage that they already have.
Native American Casinos can Do Whatever They Want
I’ve covered the limitations facing gaming sites and commercial land-based casinos when altering slots payout percentages. But what about Native American casinos?
Some slots players believe that US tribal casinos can do whatever they want, because they’re located on sovereign ground. The reality, though, is that Native American casinos don’t have as much free rein as people think.
These casinos must comply with gambling regulations set forth by the tribe’s gambling commission. These standards are defined by negotiations between tribes and the state where they’re located.
Once the state and tribe come to an agreement, the pact must be approved by the US Department of the Interior.
Contrary to some players’ opinions, Native American gambling venues don’t make rules as they go and change slots payback whenever. Instead, they too have regulations that are discussed and approved by multiple parties.
Many gamblers picture casinos fiendishly lowering slots RTP to maximize their profits. But these theories are the result of misunderstandings about how the gambling industry works.
Most land-based and online casinos operate in jurisdictions that impose restrictions on alerting payout percentages. Some jurisdictions go as far as to require paperwork every time that casinos want to change RTP.
In other cases, gambling venues can quickly change payback through server technology. Even this comes with restrictions, though, including a machine being down while the casino changes payback.
You can generally assume that most land-based slot machines offer anywhere from 88% to 95% RTP. Penny and nickel slots comprise the lower end, while quarter denominations and above constitute the higher end.
Online slots usually deliver between 95% and 97% payback. You can google individual slots or game providers to research online payout percentages.
You have little reason to fear casinos lowering RTP to a ridiculously small percentage. They have too much at stake if they’re caught, and gambling jurisdictions have rules against doing so.