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NME1850R & FME2400R
CIRCUIT BOARD TESTING
WARNING
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.)
If the "NO WATER" indicator is lit, but inspection
shows that the water level in the reservoir is above
the top of the water level sensor, OR the "BIN
EMPTY" indicator is off while inspection shows that
the ice level sensors are properly aligned, clean
and not obstructed, use the tester as follows:
Bin Control Note: All testing is done with the
electrical power on, the master switch on, and
all reset switches "reset".
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.
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.
SWITCH TO
"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
1. Unplug "water sen" connector from control
board.
2. Plug "water sen" connector from Scotsman
tester into circuit board.
PHOTO TRANS
LED
LIGHT
GOES ON
January 1995
Page 34
b. If the light on the tester IS on, move the "bin full"
SWITCH TO
"BIN EMPTY"
LIGHT GOES ON
LIGHT OFF
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