Service manual

37
Installation and Service Manual
COMPONENT DIAGNOSTICS
3 RELAY CIRCUIT BOARD PROXIMITY SWITCH CHECK PROCEDURE
3 Relay Circuit Board Proximity Switch Check Procedure
To check proximity switch, the switch must be con-
nected to the circuit board with the toggle switch in the
ice position.
IF LED OF PROXIMITY SWITCH BLINKS OFF AND
ON WITH THE OPENING AND CLOSING OF THE
WATER CURTAIN PROCEED:
A) Push manual harvest button on the circuit board
- cuber should go into harvest (defrost) mode.
Red LED of control board should come on indi-
cating harvest mode. Manually open the water
curtain - LED of proximity switch and RED LED
of control board should go out indicating the ter-
mination of the harvest mode.
B) Manually hold the water curtain in the open po-
sition for 15 seconds maximum. The ice machine
should shut down. This signals the bin control
function of the proximity switch is operational.
Closing the water curtain should restart the ice
machine in the ice making mode.
FAILURE OF THE PROXIMITY SWITCH TO FUNCTION
AS NOTED IN BOTH A AND B ABOVE - PROCEED
TO THE DC VOLTAGE CHECK PROCEDURE.
CD
CD
EV
EV
N/C
(+)
(-)
Early production 3 relay control boards had a 7 terminal
strip connector. Terminals CD must have a jumper for the
control board to function correctly.