Electronic Components - Norcold N109X Series Service Manual

Description
Inputs, outputs, monitoring, and diagnostic functions are
managed and controlled by the power board. Inputs,
outputs, monitoring information, and diagnostic functions
are communicated through the optical control assembly.
The wire harness interfacing the power board with the
optical control assembly is "foamed" into the cabinet.
Wiring pictorials and wiring diagrams can be found on
pages 45, 46, and 47.
Because the wire harness is "foamed" into the
cabinet, it is not a replaceable component. This
wire harness is not connected to the ice maker wire
harness described on page 48.
Power board
The power board is located on the back of the
refrigerator below the absorber coils. It is seated on an
insulated base to prevent the printed circuit from making
contact with the refrigerator's cabinet metal plate. The
power board seated in its base is shown in Figure 36.
Two self-tapping 1/4 inch hex head screws hold the
power board and base in place. The power board cover
is held by three self-tapping 1/4 inch hex head screws.
Removal–Power board
1. Turn OFF the refrigerator.
2. Turn OFF the RV DC power to the refrigerator.
3. Disconnect dc power supply wires from power
board terminals 12 VDC and 12_VGND1.
4. Unplug the AC power cord from the RV AC
receptacle.
5. Disconnect the AC cord from the power board.
6. Disconnect the gas valve wires from power board
terminals GV and GV_GND.
7. Disconnect the spark sense electrode wire.
N109XIM (ice maker)
• Loosen the water valve bracket, then move the
bracket/water valve assembly out of the way.
8. Remove the three 1/4 inch self-tapping hex head
screws from the power board cover.
9. Remove the power board cover.
10. Disconnect the AC heater wires from power board
terminals AC_LO and AC_HI.
11. Disconnect the wire harness connector from
power board, terminal P1.
12. Remove the two 1/4" hex head screws attaching
the board to the base, then remove the power
board along with its base.
40
N109X Models
NOtE

ELECtRONIC COMPONENtS

F3 fuse AC heater
AC power terminals
figure 36. N109X power board
Installation–Power board
1. Seat the power board in the base.
2. Attach the power board and base assembly to
the refrigerator using two, 1/4 in. self-tapping hex
head screws. Do not overtighten screws.
3. Connect the wire harness connector to the power
board, terminal P1.
4. Connect the AC heater wires to terminals AC_HI
and AC_LO.
5. Position and align the power board cover over the
power board. Attach the cover using three, 1/4 in.
self-tapping hex head screws. Do not overtighten
screws.
6. Connect the solenoid gas valve wires to terminals
GV and GV_GND.
7. Connect the spark/sense electrode wire to the
power board high tension terminal.
8. Connect the AC power cord to the power board.
9. Plug AC power cord into the RV AC receptacle.
10. Connect positive and the negative DC power wire
leads to the power board.
n Positive wire (+) to terminal 12VDC.
n Negative wire (–) to terminal 12_VGND1.
N109XIM (ice maker)
• Reinstall the water valve and bracket assembly.
11. Turn ON the RV DC power to the refrigerator.
12. Turn ON refrigerator, then check all power board
control functions before placing in service.
Wire harness 5 amp fuse
connector (P1) DC power (F1)
Refrigerator Service Manual