Technical Description
Technical Handbook
019722-101 Rev. 05
18
SC-350/360
Reset logic
Operating principle:
• P0.6 of CPU (pin 33) detect POWER FAIL. The POWER FAIL is
provided to pin 33 from pin 14 of IC2C.
• V24 VAC is detected via R10. R11 and Z6 controls the
hold peak at 3.9 V.
• Should POWER FAIL be detected (no 24 VAC), the output
pin 14 of IC2C will change to low which will be detected by P0.6
of the CPU.
• Reset signal to CPU (pin 9) is handled by IC 3 pin no 8.
Non-volatile memory
The IC4 is a serial EEPROM which forms the non-volatile memory.
If the power supply fails, the micro controller automatically stores
important information in IC4.
When the power supply returns the micro controller, the IC3 reads
stored information from the IC4 and restores the machine to the
state before the power failed.
Coin sensor
The coin sensor is connected to the micro controller IC3 via CN2.
Signal pulses from the coin sensor are processed by the micro
controller IC3. Pulses shorter than 1 ms are rejected as false.
Coin level sensor (for SC-360 with automatic coin
hopper)
The coin level sensor controls the coin level on the rotating disc and
is connected to the micro controller via a filter.
If the coin level falls too low, the micro controller sends a start signal
to the hopper motor, to enable more coins to pass to the rotating
disc.
Safety switch
The safety switch on the inspection cover monitors if the lid is open.
The switch is connected to CN3 at the PSU board. If the lid is open,
the connection between IC10 pin 2 and IC8 pin 13 is open. The
green LED above
Start/Stop
starts to flash.
The micro controller IC3 (IC1) monitors this connection via IC13
pin 10.
