Technical Description
9
013447-101_rev-07
SC 303/313
SCAN COIN
5
Technical Description
5.1
Mechanical Construction
The SC 303/SC 313 consist of a chassis enclosed within removable
plastic covers. With the covers removed all components of the
machine are accessible for maintenance.
The drives for the out-feed belt, the coin disc, and the channel drive
belt are powered by the main electric motor.
5.2
Electronics
The electronics in the SC 303 and SC 313 are contained on the CPU
board and the PSU board.
CPU Board
The functions of the CPU board are based on a single microchip
controller. The supply voltage is + 5 V DC and the power
consumption is approximately 180 mA.
Power Fail and Watch Dog
A power fail and watchdog circuit monitors the unregulated 24 V DC
supply. The watch dog is connected via CN2 pin 8 to IC8 pin 4.
If the voltage drops to approximately 14 V, power fail is detected at
pin 12 of the microcontroller. The program is interrupted and data is
transferred to the EEPROM. At the next power on, the information
written into the EEPROM is read into the microcontroller memory.
Display
There are six multiplexed, seven segment LEDs (DIS1 - DIS6)
mounted on the CPU board. Ports P00 to P07 on the
microcontroller drive the display segments and port P27 together
with IC3 select the digits. Each of the six display units is lit for
approximately 270
μ
s, which gives a cycle time of approximately 1.7
ms. To avoid display flicker the display units are updated in the order
DIS5, DIS2, DIS6, DIS1, DIS3, DIS4, DIS5 and so on.
Keys
All control keys are connected directly to the microcontroller via the
ports P10 to P15. All contact bounces are filtered by the software.
Summary of Contents for SCAN COIN SC 303
Page 1: ...013447 101_rev 07 SCAN COIN SC 303 313 Coin Counters Service Manual...
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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...
