Test Procedures - Sensors - Scotsman Prodigy Elite MC0322 Service Manual

MC0322 through MC2148
Air, Water, and Remote Cooled Service Manual

Test Procedures - Sensors

All electrical components in this ice machine can be diagnosed with a volt-ohmmeter.
Curtain Switch:
1. Test using the controller's indicator lights. Observe SW1 and SW2. Open and close the curtain in question.
When the curtain is opened, the SW light will be ON. When the curtain gets to within a half inch of closing (at
the switch) the SW light will go OUT.
2. Test with an ohmmeter. Disconnect electrical power. Open the control box cover. Unplug the curtain switch
lead from the controller. Connect an ohmmeter to the leads of the switch. Open and close the curtain. When
the curtain is closed, the switch is closed and there will be continuity (5 ohms or less). When the curtain is
open, the switch is open and the circuit will be open.
3. Test the controller's curtain switch circuit by jumping the connectors on J7 or J8 together. Reconnect
electrical power. When jumped, the matching SW light will go out. When unplugged or open, the SW light will
be ON. J8 is for the SW1 light.
Curtain Switch
Indicator Lights
Light is ON when
curtain is OPEN
Single curtain models
have one indicator
light ON all the time.
December 2015 Page 46