Power Board Replacement Procedure; Harness Connector —Optical Control Display Circuit Board - Norcold 121X Series Service Manual

Back View
Figure 7-9. —Harness connector —Optical control display circuit board.

Power board replacement procedure

Tools:
1/4" nut driver
Anti-static wrist strap
Removal of existing power board.
1. Power OFF the refrigerator.
2. Power OFF the RV DC power to the
refrigerator.
For steps 3, 4, and 5 see Figure 7-10, page 59.
3. Unplug the AC power cord at the RV AC
receptacle and at the power board.
4. Disconnect DC power supply wires at power
board terminals 12VDC and GND.
5. Disconnect the spark/sense electrode wire.
6. Remove the power board cover. See Figure
7-11, page 59.
a. Remove two 8-32 x 1" hex head screws.
b. Pull the cover off the power board.
58
S 7
ection
To disconnect
For steps 7, 8, 9, 10, See Figure 7-12, page 60.
7. Disconnect the AC heater wires at power
board:
a. Black wires at terminals AC_HT_LO and
AC_HT_LO2
b. Yellow wires at terminals AC_HT_HI and
AC_HT_HI2.
8. Disconnect the high temperature limit switch
wire leads terminals LIMIT IN and LIMIT
OUT.
9. Disconnect the wire harness connector at
terminal P1.
10. Disconnect the wire harness connector at
terminal P2.
12. Remove the existing power board from the
base and install the replacement power
board. See Figure 7-13, page 60.
13. Reverse steps 12 through 1 to complete
installation.
To connect