Interface P.c. Board (Mcc-1747) Replacement Procedure - Toshiba MMY-MUP0721FT6P-UL Service Manual

13-1-3. Interface P.C. Board (MCC-1747) Replacement Procedure

Target model 43TNV345: ALL models
This Interface service P.C. board is commonly installed in different models. After replacing the service board,
Please change the model.
Included items:
①MCC-1747 : 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 connectors and wiring for screw
terminals(⑧) which were connected to the interface
P.C. board. (Remove the connectors by pulling the
connector body. Do not pull the wire.)
(3) Remove 3 screws(⑨:2pcs, ⑩:1pcs).
(These screws are to be re-used after procedure.)
(4) Remove the P.C. board from the 6 spacers
(②:4pcs, ③:2pcs)
(5) Set the DIP switch settings of the service board to match
as before replacement.
Interface P.C.Board
（43TNV345）
7seg Display
DIP Switch
②Spacer : 4pcs ③Spacer : 2pcs
⑤Bush : 3pcs ⑥Short Connector : 1pcs
(6) Use new spacers(②, ③), a supporter(④) if they are broken.
(7) Using new bushes(⑤), attach the service board.
(8) Re-connect the connectors and resin cover, screws(⑨, ⑩), screw
terminals(⑧). Be sure that all the connectors and the screw terminals
are connected correctly and securely inserted.
The torque of the screws
(9) Attach a new clamp filter(⑦) to the lead as in the above figure.
And fix it with the lead using a cable tie.
(The cable tie is included in the package of clamp filter(⑦).
(10) The product with HP-SW2 should connect HP-SW2 to CN306.
The product without HP-SW2 should connect a short connector(⑥)
to CN306.
Caution: Please do not use a short connector(⑥) for a product with
(11) If a component on the P.C. board is bent during board replacement,
adjust it manually ensuring that it is not short or contact other parts.
(12) Install the cover, then turn on the power supply.
④Support : 1pcs
⑦Clamp
② Spacer
⑨ Screw
⑤ Bush
⑨ Screw
⑤ Bush
③ Spacer
② Spacer
⑦ Clamp filter
⑩ Screw
⑧
Screw terminal
⑨
Screw
⑩
Screw
HP-SW2. The protection circuit does not operate.
- 335 -
filter︓1pcs
Resin Cover CN306 Red
⑤ Bush
⑧ Screw terminal
M4×10 0.89 ft•lbs (1.2 N•m)
M3×25 0.44 ft•lbs (0.6 N•m )
M4×8 0.89 ft•lbs (1.2 N•m)
② Spacer
③ Spacer
② Spacer