Possible Faults And Solutions In The Circuit Of Automatic Mahjong Machine

▶Loud noise

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

▶After the control panel is raised, the card raising table will automatically rise

Cause of failure: mainly improper adjustment of the micro switch shrapnel

▶Bad control panel button will appear

The control panel does not rise; the dice keeps jumping; it rises and then falls.

▶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 multiple tricks when making cards

Cause of failure: This phenomenon is mainly due to the increase of 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 there is no gap at all. The time difference between the chain moving and the card entering speed, the counter error.

▶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 AC power 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 cards are shuffled, the cards pass through the trick sensor, and the hand-pushing device retreats to make cards

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

▶The light does not turn on when the card is ready

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

▶The magnetic coil motor turns slowly or reverses, and there is no strength

The cause of the failure: When the solid state relay of the main line board is broken, the motor will rotate slowly or the motor can't be controlled 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 swing arm 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 not in good 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 a reverse rotation phenomenon 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 operate, it is judged that the toroidal transformer is broken or the line from the output end 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 turning on the power and beeping once, it cannot be reset, and the indicators on the control panel are also on, which gives 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 slot line sensor. If it is normal, then measure whether the toroidal transformer 220v input power supply has voltage, such as Yes, it means that the toroidal transformer is damaged. If not, check whether the power switch has output voltage. If there is, it means there is a break in the connection line between the transformer and the switch. If not, it means 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 bad contact, 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 light of the control panel will flash once when each deck of cards is ready to be raised, or the dice lights 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 control panel dice coil welding place Is there a short circuit? [Full automatic mahjong machine accessories]

▶Analyze the reasons for pushing a single card

The reason for the failure: first check the height of the 4# sensor. Generally, it is the best to sense the white three-quarters of the first card, because when it is low, it will cause K1 to induce secondary induction, so push the single card; check the groove shape The distance between the optocoupler and the square light sheet is too close (generally 50 wires-1 mm), because when it is too close, there will be a malfunction when controlling the motor, which will make the continuous operation of the machine, so push the single card; check the motor Whether the inertia is too large; the phenomenon of pushing a single card will also appear when the program has a disorderly control.

▶Reset the cards without shuffling

Cause of the failure: The failure of pushing a single card will cause the customer to reset the card if it is not shuffled; it is caused by automatic power failure in the middle of the shuffling. For detailed reason analysis, see the previous failure; 16 tricks when playing 17 tricks, the reason may be the pressing board It is caused by loose or dirty corresponding chain rod sleeve; K4 sensor is broken or the position is wrong, so that K4 senses when it sees the long chain rod; the long chain rod is broken; when playing flower cards, it is when using 1st gear 11#, 12 #、14#When the sensor is broken or the position is wrong, it can't sense well and give a conversion signal, so there will be a phenomenon that the card is reset without being shuffled.

▶The solid state relay on the main board controls the motor operation

Bending angle (divided into small inside, large inside, small outside, and large outside); the crystal oscillator provides the reference frequency; the distance between the sensor sleeve and the sensor is about 0.5 cm; the sensor sleeve is dirty or the position is wrong, which will cause the machine to not reset or not distinguish