These procedures require the machine to be connected to the power supply. The voltages of the
electronic circuit are very low, but HIGHER VOLTAGES ARE PRESENT IN THE UNIT. Do not touch
anything but the tester while the unit is being checked out. Make all connections to the circuit board with
the ELECTRICAL POWER OFF.
INSTRUCTIONS FOR USING TESTER, (Optional, order part no. A33942-001)
(These instructions assume that the unit will not run, and prior investigation of electric power, controls,
and mechanical parts indicates that the electronic circuit may be at fault.)
Note: All testing is done with the electrical power
on, the master switch on.
1. Unplug ‘‘photo trans’’ and ‘‘LED’’ connectors
from the circuit board.
2. Plug ‘‘photo trans’’ and ‘‘LED’’ connectors from
the tester into the circuit board.
3. Unplug "water sen" connector from the circuit
board.
4. Plug "water sen" connector from Scotsman
tester into the circuit board.
Bin Control:
a. Move the ‘‘bin full’’ switch on the tester to Full.
The light on the tester should be ON.
If the light on the tester is not on, the circuit board
should be replaced.
b. If the light on the tester IS on, move the ‘‘bin
full’’ switch to Bin Empty. The light on the tester
should go OFF, and the Bin Empty light on the
circuit board should go ON.
If the Bin Empty light is ON, wait 10-20 seconds for
the machine to start, if the machine starts, replace
the ice level sensors.
If the Bin Empty light does not come ON, the
circuit board should be replaced.
Water Level
a. Move ‘‘water’’ switch on tester to No Water
position. The No Water light on the circuit board
should go ON. If not, replace the circuit board.
b. Move the ‘‘water’’ switch on the tester to the
Water position. The No Water light on the board
should go OFF. If not replace the circuit board. If
the light does go off, replace the water level
sensor.
If the Bin Empty light is ON, wait 10-20 seconds for
the machine to start. The machine should start.
CIRCUIT BOARD TESTING
LED
SWITCH TO
"FULL"
PHOTO TRANS
LIGHT GOES
ON
SWITCH TO
"NO WATER"
WATER SENS
LIGHT GOES ON
Single System RL
January 1997
Page 24
