Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 277

(c) Outdoor inverter PCB replacement procedure
1) Model FDC71VN
a) Replace the PCB after elapsing 3 minutes from power OFF.
(Be sure to measure voltage (DC) between T26 and T27 on inverter PCB, and check that the voltage is
discharged sufficiently (10V or less). (Refer to Fig.2))
b) Take off the connection of inverter PCB terminal and connector, and remove the screw of power transistor (IC10),
active filter (IC2), and diode stack (DS1) then remove the PCB. Wipe off the silicon grease neatly on the controller's
radiation heat fins. (Refer to Fig.1 and 2)
c) Refer to table1 for the setting of switch (JSW10, 11) of new PCB.
d) Before installing the power transistor (IC10), active filter (IC2), and diode stack (DS1) on the new PCB, apply
silicon grease equally to the their surface. (Make full use of the silicon grease.) They may be damaged unless
they apply it.
e) Tighten the screw of power transistor (IC10), active filter (IC2), and diode stack (DS1) on inverter PCB and connect
terminal and connector. Confirm the connection and there is not the half insertion. Tighten properly power
transistor, (IC10) active filter (IC2), and diode stack (DS1) with a screw and make sure there is no
slack. They can be damage if not properly tighten. (Recommended tightening torque: power transistor
(IC10)1.2±0.1 and active filter (IC2)0.98±0.1, diode stack(DS1) 0.5±0.1)Unit N∙m
259
– –