Technical Description
SC 303/313
10
013447-101_rev-07
SCAN COIN
Count Sensor Input
Signal pulses from the coin sensor are processed by the
microcontroller. Any pulses with a duration shorter than 1 ms are
rejected as false.
Permanent Memory
IC5 is a serial EEPROM which forms the permanent memory. In the
event of a power supply loss the micro controller automatically stores
important information at this location. When the power supply is
resumed the micro controller reads the information from the
EEPROM and restores the machine to the state it held prior to the
power loss.
PSU Board
The PSU board uses a 5 V/1 A switched regulator. A 6.8 V transient
absorption diode Z1 protects the circuit from transient voltages.
The motor is switched ON/OFF via opto-isolator OP1 and triac
SCR1. A single 5 V pulse is used for the switching. Forward/reverse
control of the motor is provided by means of the 24 V relay REL1.
The relay switches the motor supply voltage between two
independent windings on the motor, connected in opposite polarity.
The stop solenoid is operated via the transistor T1. This paragraph
relates to revisions 1, 2 and 3.
On revision 4 the motor is controlled by triacs only, instead of a
relay. The coin level detection is integrated on the PSU board, so
there is no need to use the CH 45 board.
Summary of Contents for SCAN COIN SC 303
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Page 37: ...Circuit Diagrams and Layouts 31 013447 101_rev 07 SC 303 313 SCAN COIN PSU board rev 4...
Page 40: ...Circuit Diagrams and Layouts SC 303 313 34 013447 101_rev 07 SCAN COIN PSU board rev 4...
Page 41: ...Circuit Diagrams and Layouts 35 013447 101_rev 07 SC 303 313 SCAN COIN...
