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11-2.IPDU P.C. board replacement procedure
(MCC-1655: 43H69024)
1. Applicable models
MCY-MHP0305HT
MCY-MHP0305HT-C
MCY-MHP0305HT-ID
MCY-MHP0305HT-CF
2. Shipped parts list
Please make sure that before you do the work, the following parts are shipped all.
No
1
P.C.board Replacement Procedure Manual (English and Chinese each 1page A4 paper double side print.)
2
Service P.C.board MCC-1655 (IPDU P.C.board) in Antistatic air cap
3. Replacement steps
(1) Turn off the power of the outdoor control unit. (Turn off the power of the outdoor unit.)
(2) Immediately after turning off the power of the outdoor unit, the electrolytic capacitors inside the unit will still
have a high voltage, and there is a risk of electric shocks. Therefore, wait at least 5 minutes after turning off
the power then start the replacement procedure.
(3) Disconnect the screws ⑤、 ⑥、 ⑦ and all connectors which are connected to the malfunctioning IPDU P.C.board.
(Since the connectors may be damaged if they are pulled out by grasping their lead wires, be sure to take hold of the
connectors themselves when disconnecting them.)
(4) Remove the malfunctioning IPDU P.C. board and Heatsink from the 1 card spacer ①, 2 card spacers ② and
2 cord clamps ③.
(Take care when removing the IPDU P.C. board not to damage the card spacers ①, ② and cord clamps ③.
If a card spacer ①, ② and cord clamps ③ have been damaged, be sure to use card spacers ①, ② and cord
clamps ③ packed with the board, and replace the damaged card spacer by following the steps in the service
manual. Failure to replace it may cause malfunction of the IPDU P.C. board.)
(5) Disconnect screws ⑧, then remove the malfunctioning IPDU P.C.board from the Heatsink. Remove 5 single-
touch spacers ④ from the malfunctioning IPDU P.C.board.
(6) The screws, cord clamps ③ and single-touch spacer ④ which were removed will be used again when the
service P.C. board is installed so keep them in a safe place to ensure that they will not be lost or misplaced.
(7) When replacing the board, install the removed single-touch spacer ④ on the service P.C.board, and evenly
apply silicone heat sink compound to the heat-sink surfaces of the IPM, IGBT and rectifi er devices on the
service P.C.board. Then install the board on the Heatsink. Failure to apply the silicone heat sink compound
may cause malfunction of the service P.C. board. (Tightening torque for screws ⑧(M3x20): 0.55±0.1 N･m)
(8) Use the removed screws ⑤(M3x20) , screws ⑥(M4x8) and screws ⑦(M4×10) to install the service
P.C.board and Heatsink in the outdoor control unit.
(9) Connect the disconnected lead wires by following the wiring diagram display panel. (Check that the wires
have been inserted correctly and securely to prevent connection errors.)
(10) If screws ⑤, ⑥, ⑦ and ⑧ are not tightened suffi ciently, the contact will deteriorate, and that will possibly
cause malfunctioning so pay attention when tightening the screws. However, power-driven screwdrivers or
air screwdrivers must not be used when installing the replacement P.C. board because using such devices
may damage the components.
(Tightening torque: screw ⑥, ⑦ 1.2 ±0.1 N･m, screw ⑤, ⑧ 0.55±0.1N･m)
(11) If any of the components on the P.C. board have been bent in the course of the replacing the board, rework
them so that they do not come into contact with the other components.
(12) Install the cover, turn on the power, and check operation.
MCY-MHP0405HT
MCY-MHP0405HT-C
MCY-MHP0405HT-ID
MCY-MHP0405HT-CF
Parts name
154
175
MCY-MHP0505HT-C
MCY-MHP0505HT-CF
Quantity
1
1
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