From error code sticky:
Universal Error Codes
11 Low Incoming Voltage
12 Ram Error
13 Power Interruption
14 Excessive Credits
21 Coin In Jam
22 Excessive Coins Inserted
31 Hopper Over Pay
32 Coin Out Jam
33 Hopper Empty
41 1st Reel Improper Spin
42 2ndt Reel Improper Spin
43 3rd Reel Improper Spin
44 4th Reel Improper Spin
50 Door Open
51 Door Open while Reel Spin
52 Coin Test with Door Open
If malfunctions mentioned below happen, the following error codes are indicated on the "WINNER PAID METER". At the same time, the "TILT" lamps on the reel glass and the tower Light (except in case of the error code "50") are turned on, the error sound is activated and the game becomes invalid
ERROR CODES
TROUBLES
11 LOW VOLTAGE
12 BATTERY POLARITY
21 COIN JAM
31 COINS OVER-DISPENSED
32 HOPPER JAM
33 HOPPER EMPTY
41 1ST REEL SPINNING IMPROPERLY
42 2ND REEL SPINNING IMPROPERLY
43 3RD REEL SPINNING IMPROPERLY
50 DOOR OPEN
LOW VOLTAGE "11"
If voltage temporarily drops, the error code "11" is indicated on the "WINNER PAID METER", the "TILT" lamps are turned on, the error sound is activated and the game becomes invalid. However, when voltage recovers to the rated minimum, the machine is automatically reset within 2 seconds and the game becomes valid. Please note that the display of the error code "11" still remains on the "WINNER PAID METER" even after the machine is automatically reset. It will be cleared when a next game is played.
BATTERY POLARITY "12"
If the voltage of the built-in battery is lower than the rated one when AC power is "ON", the error code "12" is indicated on the "WINNER PAID METER", the "TILT" lamps are turned on, the error sound is activated and the game becomes invalid. In such a case, the built-in "RAM" has not memorized the previous status. Therefore, it is necessary to completely clear the "RAM" memory. Press the "ALL CLEAR SWITCH" being located on the "MAIN LOGIC BOARD" and at the same time, switch on AC power. Please note that you have to keep pressing the "ALL CLEAR SWITCH" at least 2 or 3 seconds even after switching on AC power. Through the above procedures, the "TILT" lamps and the error sound can be turned off. Also the error code "12" can be cleared and the game becomes available.
CO IN JAM "21"
If it takes more or less than the time being fixed for a coin to pass through the "COIN SWITCH", a coin passes the "COIN SWITCH" from down to up, or some coins are jammed at the "COIN SWITCH", the error code "21" is indicated on the "WINNER PAID METER", the "TILT" lamps are turned on and the error sound is activated. The "COIN SWITCH" is using two photo sensors, which not only count the inserted coins but also protect a machine against "STRINGING". Press the "RESET SWITCH" to clear all the above. If coins are jammed around the "COIN SWITCH", remove them before pressing the "RESET SWITCH".
COINS BEING OVER-DISPENSED "31"
If the "HOPPER UNIT" pays out more coins than the coins being won or pays out coins except when they are won, the error code "31" and the numbers of coins being over-dispensed are indicated on the "WINNER PAID METER", the "TILT" lamps are turned on and the error sound is activated. During this status, the game is invalid. In such a case, press the "RESET SWITCH" to clear the status of the error code "31". Please note that the numbers of coins being over-dispensed are totaled to the "METER READING NO. 3 (TOTAL OUT)" and the "METER READING NO. 9 (OVER PAID)".
HOPPER JAM "32"
If the "HOPPER PAYOUT COUNTSWITCH" is switched on for 2 or 3 seconds by some obstructions like coins being jammed in it, the error code "32" is indicated on the "WINNER PAID METER", the "TILT" lamps are turned on and the error sound is activated. If this happens, press the "RESET SWITCH" to clear the status of the error code "32" after removing such obstructions.
HOPPER EMPTY "33"
If coins are not paid out within 9 to 10 seconds after the "HOPPER UNIT" starts running, the error code "33" is indicated on the "WINNER PAID METER", the "TILT" lamps are turned on and the error sound is activated. During this status, the game is invalid. This error normally happens when there are no coins in the "HOPPER UNIT". Therefore, refill the "HOPPER UNIT" with coins and press the "RESET SWITCH" to clear the status of the error code "33". Then close the "FRONT DOOR". The "HOPPER UNIT" starts to pay out the balance.
1ST REEL SPINNING IMPROPERLY "41"
In case the 1st reel spins improperly or does not spin, the error code "41" is indicated on the "WINNER PAID METER", the "TILT" lamps are turned on and the error sound is activated. In such a case, the status at the time when the error happens is maintained until the status of the error code "41" is cleared by pressing the "RESET SWITCH". Please note that the reel spinning sound changes to the error sound 15 seconds after the said error happens, and also that the game being in progress at the time when the said error happens becomes invalid. Press the "RESET SWITCH" to clear the status of the error code "41.
2ND REEL SPINNING IMPROPERLY "42"
In case the 2nd reel spins improperly or does not spin, the error code "42" is indicated on the "WINNER PAID METER", the "TILT" lamps are turned on and the error sound is activated. During this status, the game is invalid.
3RD REEL SPINNING IMPROPERLY "43"
In case the 3rd reel spins improperly or does not spin, the error code "43" is indicated on the "WINNER PAID METER", the "TILT" lamps are turned on and the error sound is activated. During this status, the game is invalid.
DOOR OPEN "50"
In case the front door is open, the error code "50" is indicated on the "WINNER PAID METER", the "DOOR OPEN" lamp (yellow color) on the tower light unit is turned on and the error sound is activated every 2 minutes. During this status, the game is invalid but can be tested by using the "COIN TEST SWITCH". The "DOOR OPEN" lamp and the error sound can be turned off by closing and locking the front door. However, the error code "50" still remains on the "WINNER PAID METER" even after the front door is closed and locked and can be cleared only
when a next game is played. Please note that the insertion of coins during this error is the same as using the "COIN TEST SWITCH" and is not added to the "TOTAL IN COUNTER", Also there is no actual payout even though you win
Moi c'elle qui m'intéresse est la COINS BEING OVER-DISPENSED "31"
C'est quand la MAS vous surpaye une ou plusieurs pièces d'où le code erreur.
J’aimerais savoir peut importe la marque de votre MAS ( Bally, IGT, pachi, ...) qu'elle manipulation vous effectuer pour résoudre ce problème?????

Si quelqu'un peut ouvrir un manuel ou peut me renseigner sa serais sympa

A++ les gars