Circuit Board Testing - Scotsman NME650R Service Manual

NME650R

CIRCUIT BOARD TESTING:

INSTRUCTIONS FOR USING TESTER (Optional,
order part no. A33942-001)
(These instructions assume that the unit will not
LED
SWITCH TO
"FULL"
run, and prior investigation of electric power,
controls, and mechanical parts indicates that the
electronic circuit may be at fault.)
Note: Testing is done with the electrical power
on, the master switch on, and all the reset
switches "reset".
Electrical Shock Hazard.
Electrical shock can cause
personal injury.
Disconnect electrical
power before connecting
tester.
PHOTO TRANS
LIGHT
GOES 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 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.
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
SWITCH TO
"NO WATER"
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.
June 1994
Page 36
LIGHT ON
WATER SENS