Electronic Tester; Circuit Board Testing - Scotsman FME2400 Service Manual

NME1850 & FME2400

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
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:
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.
LED
SWITCH TO
''FULL ''
3. Unplug ''water sen'' connector from control
board.
4. Plug ''water sen'' connector from Scotsman
tester into 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.
PHOTO TRANS
LIGHT GOES
ON
''NO WATER ''
January 1994
Page 32
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.
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.
SWITCH TO
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.
LIGHT ON
WATER SENS