Scotsman AF Series Service Manual page 26

Page 26
As soon as the ice is scooped out (with the
resumption of the light beam between the two
infrared sensor of ice level control) 6 seconds later the
ice machine resumes its operation with the simul-
taneous extinguishing the 2nd YELLOW LED.
F. P.C. BOARD (Data processor)
The P.C. BOARD, fitted in its plastic box located
in the front of the unit, consists of two separated
printed circuits one at high and the other at low
voltage and protected by fuses. Also it consists of
five aligned LEDS monitoring the operation of the
machine of three jumpers (TEST used only in the
factory, 60/70°C used to set up the PC Board at
proper safety cut out condensing temperature
and 3' to by pass the 3 minutes Stand By) and of
input terminals for the leads of the sensor probes
as well as input and output terminals for the leads
of the ice maker electrical wires.
The P.C. BOARD is the brain of the system and
it elaborates, through its micro processor, the
signals received from the sensors in order to
control the operation of the different electrical
components of the ice maker (compressor, gear
motor, etc.).
The five LEDS, placed in a row in the front of the
P.C. BOARD, monitor the following situations:
GREEN LED
Unit under electrical
power
YELLOW LED
- Blinking: I/R beam cut
out
- Steady: unit shut-off at
storage bin full
- Blinking fast: I/R beam resumed
TO BY-PASS THE 3'/60' STAND BY TIME, SYMPLY JUMP "TEST" CONTACTS WITH PCB ENERGIZED
3' STAND BY BY-PASS JUMPER
60-70°C
60-70°C
JUMPER
JUMPER
POWER
POWER
BIN FULL
NO WATER
TO HI/LOW COND.
TEMP.
TEMP.
3' STAND
3' STAND
BYPOWER
TO HI EVAP. TEMP.
WRONG OR SLOW
SYEN
DRIVE MOTOR
ROTATION
ROTATION
WATER SENSOR
SOCKET
DRIVE MOTOR SENSOR SOCKET
CONDENSER SENSOR SOCKET
REMOTE
MICROPR. EPROM
SOCKET
JP1 TEST
JP260/70°C
JP3
EVAPORATOR SENSOR SOCKET
YELLOW LED
Unit shut-off due to a
too lo-water level into
float tank
RED LED
ON all the time
- Unit shut-off due to a
too hi-condensing
temperature
- Unit shut-off due to a
too lo-ambient temperature
°
<+1 C
Blinking
3 minutes start up delay time
YELLOW LED
ON all the time
- Unit shut-off due to the
wrong rotation direction
of gear motor
- Unit shut-off due to the
too lo speed of gear motor
Blinking
- Unit shut-off due to a
too hi-evaporating temp.
°
>-1 C after 10 min of operation
YELLOW AND
RED LED
- Blinking: Evaporator sensor
out of order
- Steady: Condenser sensor
out of order
I/R ADJUSTER
OPTICAL ICE LEVEL
OPTICAL ICE LEVEL
CONTROLSENSOR SOCKET
Page 26
TRIAC
TRIAC
TRANSFORMER
TRANSFORMER
DRIVE MOTOR
RELAY
RELAY
COMPRESSOR
RELAY
RELAY
FUSE
FUSE
RESISTANCE
RESISTANCE
TERMINAL
TERMINAL
BOARD
BOARD