Fault Codes; Blank Display; Fig. 14 - Continuous 12 Volts - Norcold 2118IM Service Manual

Fault Codes

Blank Display

On-Off Theory of Operation:
Continuous 12-Volts (See Fig.14)
12VDC is supplied to the refrigerator at Power Board terminals
12VDC & GND [A]. This 12VDC travels through the Power Board
to fuse F1 [B] and then out to P1-6 [C]. Via the red-blue wire, the
12VDC exits the Power Board and enters the Display Board at
P1-1 [D]. The 12VDC travels through the Display Board to one side
of the normally open On-Off switch [E]. This 12VDC is referred
to as the continuous 12-volts because it is always present at the
one side of the On-Off switch when 12VDC power is applied to the
refrigerator.
P3
WH-BK/BC-NR
POWER BOARD/PANNEAUD'ALMENTATION

Fig. 14 - Continuous 12 Volts

Switched 12-Volts (See Fig. 15):
Pressing the On-Off switch [E] will allow 12VDC to pass through
the On-Off switch and back to the Power Board via the blue wire [F]
connected between the Display Board at P1-3 [G] and the Power
Board at P2-3 [H]. Once the 12VDC reaches the Power Board, a
signal is sent out to the coil of relay K3 [J] via the U1 microproces-
sor. This signal allows the K3 relay to energize thus closing the
normally open contacts [K].
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12VDC
1 2
B
GND
-
YL-GN/JN-VE
-
-
-
+
+
+
+
+
+
+
LIMIT_OUT
LIMIT_IN
AC_HT_HI_2
AC_HT_HI
AC_HT_LO_2
AC_HT_LO
BU-BL
BK-NR
L2
L1
12VDC/VCD (BAT POS)
A
12VDC/VCD (BAT NEG)
C
D
RD-BU/RG-BL P1
1
RD-YL/RG-JN ON-OFF
2
Vreg
BU-BL
3
BK-NR
4
5
15
MODE
TEMP
E
P3
MICRO
DISPLAY BOARD / CARTE D'AFFICHAGE
SERVICE MANUAL