Circuit Board Diagnostic Procedure - Cornelius CR1200 Service Maintenance Manual

CIRCUIT BOARD DIAGNOSTIC PROCEDURE

Turn the power switch to the "ON" position. The D-5 red LED (error indicator) will be illuminated for 2 seconds.
After the D-5 red LED goes out, short across the bottom two terminals of the Test Plug with a jumper wire or a
pocket screwdriver and then remove the jumper. The circuit board is now in the test mode.
One of these two conditions will exist:
S If the Ice Thickness Potentiometer is within the factory setting the D-5, red LED will flash continiously.
S If the Ice Thickness Potentiomater is not within the factory setting, the D-5 red LED will not be illuminated.
In either case the Green LED indicators will illuminate for 2 seconds each in the sequence shown below. They
will continue to sequence until you turn the power off and stop the procedure.
Failure of the green LED's to cycle in this sequence indicates a defect in the circuit board.
166240004
D-11 Green
D-12 Green
D-14 Green
D-6 Green
D-15 Green
22
Hot Gas
Water Pump
Contactor
Fan
Dump Valve
12/1/94
Rev 3/4/96