DC Wire Removal:
1. Drop door down and remove the door assembly by loosening the two screws in the
middle of the door assembly. The screws are captive and will not fall out. Pull out at the
top of the door assembly to remove from case.
2. On the bottom left side of the fuse board find the lug that is marked NEG and has a
white wire going to it. Loosen screw and remove wire.
3. On the bottom right side of the fuse board find the lug that is marked VCC and has a red
wire going to it. Loosen screw and remove wire.
AC Wire Removal:
CAUTION: MAKE SURE THE RV IS UNPLUGGED FROM ANY 110V POWER
SOURCE (SHORE CORD, GENERATOR, OR INVERTER).
4. Remove the converter black wire from the breaker. NOTE: This wire has a metal pin that
is inserted into the breaker with a pigtail wire added to it. If the pigtail wire is connected
to another wire, disconnect that wire from the pigtail.
5. Remove the converter white wire from the neutral bus bar.
6. Remove the converter green wire from the ground bus bar.
7. In the converter compartment, remove the two screws at the front of the MBA holding
it in place. Slide the MBA forward routing the wires through the slots in the case until
you see the majority of the MBA board. Disconnect the 4-pin connector on the MBA
control board by gently pulling it out of its socket. Similarly, disconnect the 3-pin
connector from the small vertical daughter board. At this time, you can pull the MBA
fully out of the case.
NOTE: When installing a replacement MBA, reverse the order of steps 1-7.
If the MBA is being returned under a warranty claim, follow the packaging instructions in
your warranty claim packet.
Figure 4
8
Summary of Contents for WF-8500MBA Series
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