How To Repair The Circuit Of Automatic Mahjong Machine

▶Undivided

Failure reason: K1 is broken, the machine head will not push the card; 12# is broken, it will cause no card; K2 is broken, causing no card; K3 is broken, shuffled after a few tricks, it will not be able to branch. K4 sensor is broken, The chain cannot be stopped.

▶Loud noise

When K5 is broken and there are too many cards in the conveying trough, the magnetic turntable will not stop and the noise will be very loud.

▶Card issuance

The cause of the fault: the slot line sensor is broken, and the machine head will not stop when the power is turned on. If the oil inlet machine head does not work well, sometimes the card will be issued; 11# is broken, it cannot be used when the trick is changed, when there is a good card in the machine, Turn on the power and the machine will card the card.

▶Tricks are not converted

Cause of failure: 13#, 14# are broken, they cannot be used in the first gear, and the tricks cannot be changed.

▶17 tricks, 18 tricks appear

Failure reason: 12# sensor (pier position count) is in the wrong position or the gap of the slot-shaped optocoupler square light sheet is small.

▶After the control panel is raised, the card raising table of one party will be raised automatically

The cause of the failure: mainly due to improper adjustment of the microswitch shrapnel

▶When the machine is turned on, the motor may run automatically according to the rules

The cause of the failure: the motherboard chip program may be disordered or the crystal oscillator is broken.

▶Occasionally there are multiple tricks when making cards

Cause of failure: This phenomenon is mainly due to the increase in the inertial distance of the motor after the new motor has been running for a period of time, and the gap between the square light barrier and the slot-shaped optocoupler has become smaller, and sometimes the gap is completely absent. The time difference between the chain moving and the card entering speed, the counter is wrong.

▶The control board dice keeps jumping or not jumping

The cause of the failure: the relay or the controllable silicon is broken down; the corresponding lift contact switch is in a normally closed state, or it is caused by interference.

▶The up and down movement of the up-and-down table is non-stop

The cause of the failure: the button is broken or the control panel transistor is broken, and the 11 volt alternating current is not available.

▶The machine head keeps pushing during the shuffling process

The cause of the failure: the slot-shaped optocoupler is broken, the line contact is not good or the main board is broken

▶When the card is shuffled, the card passes through the trick sensor, and the machine head pusher retreats to make the card.

The cause of the failure; this phenomenon is generally caused by the poor sensitivity performance of the K2 sensor. (Old style has a through-beam sensor)

▶The lights don’t light up when the cards are ready

The cause of the failure: the flat wire is in poor contact; the control panel light is broken.

▶The magnetic coil motor rotates slowly or reversely, and there is no strength

The cause of the fault: When the solid-state relay of the mainline board is broken, the motor will rotate slowly or the motor will run out of control when the power is turned on. If there is no strength, sometimes the line connector is poorly contacted or the capacitor is broken.

▶The control panel does not rise or fall continuously

The cause of the failure: The failure to lift is due to the control panel button failure or the flat wire damage or the swingarm and the bearing jump out, the bearing screw is off, and the motor is broken. Constant lifting is: the contact switch of the lifting motor is damaged; the contact switch line connector is in poor contact; the flat wire is short-circuited; the control panel button is short-circuited; the main board control output is faulty; the external power source interference signal is too strong.

▶The chain motor has reversed force rotation or the motor has no action

Causes of failure: Generally judged to be a bad capacitor; poor contact of connectors; failure of the motor itself.

▶Turn on the power, the machine will not automatically reset, no buzzer

Cause of failure: The above phenomenon shows that the machine has no output power supply. Check the 220v output terminal voltage of the power switch. If not, the power switch is broken. If there is 220V voltage, all motors will not work, it is judged that the toroidal transformer is broken or the line from the output terminal of the power switch to the toroidal transformer is broken, whether the small transformer has 8V AC output, whether the switching power supply has 5V DC Output.

▶After the power is turned on, the buzzer can't be reset, and the indicators on the control panel are also on, giving people the feeling that there is no power.

The cause of the failure: firstly make the machine head in the closed state, and then turn on the power. If reset, it means that the machine head motor is damaged or there is a problem with the groove sensor. If it is normal, then measure whether the power supply at the 220v input end of the toroidal transformer has voltage, such as Yes, the toroidal transformer is damaged. If not, check whether the power switch has output voltage. If there is, it means that there is a disconnection at the connection line between the transformer and the switch. If not, it means that the power switch is damaged and just replace it.

▶Automatic power failure analysis

Cause of failure: Regarding automatic power-off, first check whether the motor connector has poor contact, and whether the 220v power switch is fixed, and then check the turntable. The wiring below is correct. Try to bundle the optical induction line and the motor power line. Check that everything is normal. At this time, consider whether the original accessories are caused by poor performance. At this time, you can directly change the power switch. Another type of automatic power-off is that the dice lights on the control panel will flash once when each deck of cards is ready to be raised, or the lights on the dice will flash once during the process of making the cards. Whether the flat wire is short-circuited, whether the 11#, 13#, 14# road plate sensor is directly rubbed with the push plate, whether the K2, 12# light-sensitive fixing screw is directly short-circuited with the light-sensitive welding point, and the welding point of the dice coil of the control panel Is there a short circuit?