Scotsman C2648 - Manual (Page 43)

C2648 Prodigy and Prodigy Plus Service Manual
January 2015
Page 43
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 and the Period in the display code.
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 - a good curtain switch will have
very low resistance when the curtain is closed - .5 to 2 ohms. A defective switch has about 100 or more
ohms of resistance when the curtain is closed. 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 J1 or J2 together. Reconnect
electrical power. When jumped, the matching SW light will go out. When unplugged or open, the SW light
will be ON.
Curtain Switch Indicator Lights
Light is ON when curtain is open
Curtain
Switch