Fan-Motor P.c. Board (Mcc-1734) Replacement Procedure - Toshiba MMY-MUP0801HT8P-TR Service Manual

(8) Screw the Compressor P.C. board to the heat sink by the six screws (
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.
(9) Re-connect the connectors and screw terminals (
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.

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:
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) Remove two screws (
(These screws are to be re-used after
procedure.)
(4) Remove the P.C. board from the four spacers
( ) 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 (
Silicone Thermal Grease use one of the following
• Momentive Performance Materials ''TIG1000''
• Shin-Etsu Chemical ''G-746'' or ''G-747''
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
Screw terminals
).
DB01, Q201
Collar and bush
Fan-motor P.C. board
(43T6W894)
Spacer
Spacer
SW800
).
• Mizutani Electric Ind ''HSC1000''
• Dow Corning Toray ''SC102''
- 295 -
) that were removed in step (3).
2.0N• m
M5 10
M4 15 1.2N• m
M3 25 0.6N• m
Space r
Space r
Pinch this part by
round-nose pliers for
removing the P.C. board
Spacer
Screw
Screw