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13-1-5. Fan-Motor P.C. Board (MCC-1734) Replacement Procedure
Target model 43T6W894: ALL model
This board is commonly installed in different models.
match as before replacement.
Included items:
① MCC-1734 : 1pcs
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) ) R
ove 2 screws(③).
(These screws are to be re-used after procedure.)
(4) Remove the P.C. board from 4 spacers(②)
by round-nose pliers.
(5) Set the SW800 setting of the service P.C. board to match as before
replacement.
(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 (②).
Silicone Thermal Grease use one of the following
･Momentive Performance Materiais ''TIG1000''
･Shin-Etsu Chemical ''G-746'' or ''G-747''
(7) Screw the Fan-motor P.C. board to the heat sink by the 2 screws (③) 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.
(8) Re-connect the connectors. Be sure that all the connectors are connected correctly and securely inserted.
(9) If the components on the P.C. board were bent during board replacement, adjust it manually ensuring
that it is not short or contact other parts.
(10) Install the cover, then turn on the supply. Check the operation.
Set the DIP switch (SW800) settings of the service board to
② Spacer : 4pcs
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.
The torque of the screws
③
- 301 -
Fan-motor P.C. board
(43T6W894)
② Spacer
② Spacer
SW800
･Mizutani Electric Ind ''HSC1000''
･Dow Cornig Toray ''SC102''
Screw
M3 x 0.55" (14mm)
② Spacer
② Spacer
Pinch this part by round-
nose pliers for removing
the P.C. board
② Spacer
0.44 ft•lbs (0.6 N•m )
③ Screw
③ Screw
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