Fig. 15 - Switched 12 Volts - Norcold 2118IM Service Manual

Fault Codes, cont'd.
P3 1 2
J
WH-BK/BC-NR
H
BU-BL
BK-NR
POWER BOARD/PANNEAUD'ALMENTATION

Fig. 15 - Switched 12 Volts

K3 is a latching relay. Once the relay
NOTICE
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 red-yellow wire [L] between P1-9 of
the Power Board and P1-2 [M] of the
Display Board. This 12VDC will remain at
P1-2 [M] 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.
2118, 2118IM, 2118IMD Series
12VDC/VCD (BAT POS)
12VDC
12VDC/VCD (BAT NEG)
GND
-
YL-GN/JN-VE
-
-
-
+
+
+
+
K
+
+
+
LIMIT_OUT
LIMIT_IN
AC_HT_HI_2
AC_HT_HI
L
AC_HT_LO_2
AC_HT_LO
F
L2
L1
RD-BU/RG-BL P1
1
RD-YL/RG-JN ON-OFF MODE
2
Vreg E
BU-BL
3
BK-NR
4
5
P3
MICRO
M
G
NOTICE
16
TEMP
DISPLAY BOARD / CARTE D'AFFICHAGE
The On-Off switch [E] is a momentary
push- button switch. The operation de-
scribed 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.
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