Part Replacement Instructions
900-0107-01-00 Rev A 9
6. With the AC PCBA lifted as high as possible, guide the Control PCBA into its slot in the chassis. Lower
the AC PCBA over the top of the Control PCBA. As shown in Figure 14, there is a “lip” on the AC PCBA
that fits over the top of the Control PCBA.
IMPORTANT:
Ensure the AC wires from the transformer (see step 5) are routed through the gap
on the bottom of the AC PCBA. (See Figure 10.) Routing them elsewhere will
pinch the wires and could cause the inverter to fail.
Ensure that the copper prongs on the AC PCBA do not pinch the output wires
when the board is lowered into place.
7. Once each PCBA is seated and secured in the chassis, re-attach the ribbon cables to the boards.
NOTE: FX-class inverters use two identical cables with 34 pins. Ensure that the cables are bent as
shown in Figure 15 so that they can be routed correctly inside the inverter.
NOTE: FXR-class inverters do not have identical cables. Do not confuse them. The cable between the
AC PCBA and Control PCBA has 34 pins. The cable between the FET PCBA and Control PCBA has 40 pins.
Ensure the cables are bent as shown in Figure 15 so that they can be routed correctly inside the inverter.
Figure 15 Ribbon Cables
8. Install the ribbon cable that is bent on one end to the FET PCBA and the Control PCBA. (See Figure 16 and
also Figure 7 if necessary.) In the FX inverter, this cable has 34 pins. In the FXR inverter, it has 40 pins.
Make sure the red stripe is oriented toward the top of the chassis. Push down on each end until the levers
click and the plug is secure.
Figure 16 FET to Control Ribbon Cable
AC to Control
Ribbon Cable
(34 pins)
FET to Control
Ribbon Cable
(34 pins for FX,
40 pins for FXR)
Red Stripe to Top
Red Stripe to Bottom
Red Stripe to Top
