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20
Refrigerator Service Manual
NX6 / NX8 / NXA Models
Note: K3 is a latching relay. Once the relay coil is
energized the contacts close and remain closed even
when the 12VDC is removed, hence the term “latching
relay”. With the K3 contacts now closed, 12VDC is
passed back to the Display Board via the White-Red
wire [J] between P1-9 of the Power Board and P1-2 of
the Display Board. This 12VDC will remain at P1-2 until
the latching relay is “un-latched”, which will not take
place until the On-Off button is depressed again. This
12VDC is termed the switched 12-volts and is used to
power ON the display.
Note: The On-Off switch [E] is a momentary push-
button switch. The operation described above takes
place during the “split second” the On-Off button is
depressed to power the refrigerator on. If for some
reason the display does not turn on, the On-Off button
can be pushed and held down to aid in troubleshooting.
EXAMPLE: Verify you have 12VDC between P1-1
(GND) and P1-6 (continuous 12-volts) of the Power
Board. Leave the meters black ground lead connected
to P1-1 and move the red positive lead from P1-6 to
P2-3 of the Power Board. Have someone press and
hold the On-Off button. You should measure 12VDC as
long as the On-Off button is held in. When the On-Off
button is released you should see the 12VDC go away.
NX61 / NX81 Fault Codes - cont’d
