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PRECAUTIONS FOR SERVICING
Be sure that the power switch is turned off or the power cable is disconnected before servicing.
Removing the P.W.B.s.
System Configuration of Outdoor Unit Electrical Parts.
The outdoor unit electrical parts consist of two P.W.B.s as shown in the figure.
<Main P.W.B. (M board)>
Contains a rectifier circuit and inverter module, their controlling microcomputer and
microcomputer peripheral control circuits. The board incorporates high and low current sections.
<Power P.W.B. (P board)>
Contains a switching power circuit, noise filter, power factor improvement circuit, etc.
The switching power circuit supplies power to electronic circuits on the Main P.W.B. through
CN3.
When replacing any P.W.B, disconnect all the cab les (including ground wires).
※
[A. Main P.W.B.]
Remove four screws securing the Main
1.
P.W.B. to the cooling fins, and remove the
Main P.W.B. from the cooling fins.
[B. Power P.W.B.]
Open the support latches and raise the
1.
power P.W.B. in the direction of the arrow as
shown in Fig. A.
<Direction of the power P.W.B. removal>
WARNING
2.
- 89 -
Open the support latches and raise
the Main P.W.B. in the direction of
the arrow as shown in Fig. A.
<Direction of the Main P.W.B. removal>
Open these support latches to
remove the power P.W.B.
Fig. A
Open these support latches to
remove the Main P.W.B.
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