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Troubleshooting Williams/Bally WPC System & System 11. 

Deltronic 1275 Ticket Dispenser

Despite the fact that the ticket dispenser is a fairly simple device a regular maintenance is required to ensure its reliable operation. The most common ticket dispenser is the Deltronic ( DL 1275) ticket dispenser. The connection to the machine is very simple. A four wire connection is all what is required. Ground (black wire), +12V (red wire), notch output (blue wire), motor drive input (white wire).

The machine will drive the motor drive input "high" in order to switch the motor "ON". The motor driver transistor (NPN Darlington driver transistor) will turn "ON" and will connect ground to the motor. Note that the other side of the motor is connected to the +12V.The motor will turn and keep dispensing the tickets as long as the drive input is held "high". The tickets are passing through the opto interrupter (opto switch) which detects the notches on the edge of the tickets. Every notch creates a pulse which is further conditioned by a CMOS Schmitt Trigger IC Inverter (4584 or 40106) and an open collector transistor (2N2222 or 2N4401). These pulses are fed back to the game computer. Each dispensed ticket creates one pulse.

The game computer counts the pulses and will keep dispensing the tickets until the the number of pulses received will be equal to the number of tickets the game computer intended to dispense. Then the motor drive input will be driven "Low" and the dispensing will stop. In order to prevent any part of the ticket to be dispensed after the motor is switched "OFF" the motor must stop suddenly. A brake transistor connected across the motor ensures that. Without it the motor would keep turning for brief time dispensing a portion of the ticket.

The brake transistor takes no part in switching the motor "ON". It only acts briefly when the motor is switched '"OFF". As the motor tends to continue spinning, it becomes a dynamo generating power. The brake transistor turns "ON". The current flowing through the brake transistor and the motor creates a magnetic field, which will bring the motor to a sudden stop.


The failure to detect the notch is probably the most common problem. The opto switch gets obstructed by the dust created from the paper fiber and must be regularly cleaned. A paintbrush used just for this purpose works well.

Check the opto switch with your multimeter. Measure the voltage on the notch output (blue wire) against the ground (black wire). You should measure 5V with the opto switch obstructed and below 0.7V with the opto switch cleared. If the notch output stays on 5V no matter what you do with the opto switch, clean the opto and retest it. If it is still not okay the opto switch may need to be replaced. If the notch output measures 0V with the opto switch obstructed , it may mean the notch output is not connected to the game board input. Check this connection. The 5V comes from a pull up resistor which is a part of the game board input.

We also need to make sure that the tickets are passing through the opto switch. A spring blade mounted in opposite of the opto switch pushes the tickets toward the switch. Make sure that there is enough tension but not more than it is necessary.


It will depend on the game software. Most machines will let the ticket dispenser run for brief time and if the notch is not received they will turn the motor off. Usually four tickets are dispensed. So, if someone complains that four tickets are dispensed no matter what score has been reached, you know what to look for. In some rare instances the game software does not treat this condition very well and the machine may leave the motor turned on and thus dispense all of the tickets.


Keep the mechanism clean, free of dust and ticket leftovers. Keep all screws tight.Check the top and the bottom ticket guides. Older dispensers may need to be upgraded with new metal guides and transporting rollers. The new metal guides are not only stronger but they also have a different shape and protrude from the slot in the front plate. This eliminates ticket jamming on the front plate.Make also sure that the top spring has enough tension to ensure good grip of the ticket.





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