(8) Screw the Compressor P.C. board to the heat sink by the six screws (
h
,
i
) that were removed in step (3).
If the screws are loose, the semiconductors will generate heat, and cause it to breakdown.
Do not use an electric driver or an air driver.
The semiconductor may receive a damage.
13-1-5. Fan-Motor P.C. Board (MCC-1734) Replacement Procedure
Subject part
43T6W894
: ALL model
This board is commonly installed in different models. Set the DIP switch (SW800) setting of the service board
to the switch setting before replacement.
Included item:
The torque of the screws
Screw terminals
M5
10
2.0
N•
m
DB01, Q201
M4
15 1.2N• m
Collar and bush
M3
25 0.6N• m
(9) Re-connect the connectors and screw terminals (
g
).
Be sure that all the connectors and the screw terminals
are connected correctly and securely inserted.
(10) If the components on the P.C. board were bent during board replacement, adjust it manually ensuring that
it is not short-circuited or contact other parts.
(11) Install the cover, then turn on the supply. Check the operation.
MCC-1734 : 1pcs
Spacer : 4pcs
+%
%0
%0
%0
%0
%0
%0
%0
+%
%0
59
%
%0
(
+%
%0
%0
%0
%0
%0
%0
%0
+%
%0
59
%
%0
(
Fan-motor P.C. board
(
43T6W894
)
Pinch this part by
round-nose pliers for
removing the P.C. board
Spacer
SW800
Screw
Screw
Space r
Spacer
ԙ
Space r
Spacer
Uniformly apply the Silicone Thermal Grease to the heat dissipating
surfaces of the IPM (IC300).
Note: Do this work carefully. Please do not soil or scratch the area which
attaches the semiconductor of a heat sink.
Silicone Thermal Grease use one of the following
• Momentive Performance Materials ‘’TIG1000’’
• Mizutani Electric Ind ‘’HSC1000’’
• Shin-Etsu Chemical ‘’G-746’’ or ‘’G-747’’
• Dow Corning Toray ‘’SC102’’
Replacement steps:
(1) Turn off the power supply of the outdoor unit and
wait at least 5 minutes for the capacitor to
discharge.
(2) Remove all of the connector which were
connected to the Fan-motor P.C. board. (Remove
the connectors by pulling the connector body. Do
not pull the wire.)
(3) Remove two screws (
e
).
(These screws are to be re-used after
procedure.)
(4) Remove the P.C. board from the four spacers
(
d
) by round-nose pliers.
(5) Set the SW800 setting of the service P.C. board to match the switch
setting from the original P.C. board.
(6) Apply the Silicone Thermal Grease to the semiconductors (IC300) on
the service P.C. board, and align the positions of the heat sink holes to
mount the Fan-motor P.C. board on the outdoor control unit. And fix the
Fan-motor P.C. board to the outdoor control unit by the spacers (
d
).
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Summary of Contents for MMY-MUP0801HT7JP
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