Ipdu P.c.board Replacement Procedure - Toshiba MCY-MUG0401HSW-E Service Manual

11-2.IPDU P.C.board Replacement Procedure

1. 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-1690 (IPDU P.C.board)
3 Card Spacer (No.
③
2. 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 before starting the replacement procedure.
(3) Make sure that the voltage between the –side of DB01 and the +side DB02 is low before working.
(4) Disconnect all the screws ④ , screw ⑤ and screws ⑥ and 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.)
(5) Remove the malfunctioning IPDU P.C. board from the 2 single-touch spacers ① and 2 card spacers ③ .
(Take care when removing the IPDU P.C. board not to damage the 2 card spacers③. If a card spacer ③ has been damaged, be sure to use
a card spacer③ packed with the board and replace the damaged card spacer by following the steps in the service guide. Failure to replace
it may cause the IPDU P.C. board to malfunction.)
(6) The screws and single-touch spacers ① 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 spacers ① on the service P.C. board, and evenly apply silicone heat sink
compound to the heat-sink surfaces of the IPM, IGBT and rectifier devices on the service P.C. board. Then install the board in the outdoor
control unit.
Failure to apply the silicone heat sink compound may cause the service P.C. board to malfunction.
(Tightening torque for screws ② (M4x14) used to secure single-touch spacers ① : 1.2 ±0.1 N•m)
(8) When replacing the board, use the removed screws④(M4x8) , screws ⑤(M3x14) and screws ⑥(M4×15) to connect the disconnected lead
wires following the wiring diagram display panel. (Check that the wires have been inserted correctly and securely to prevent
connection errors.)
(9) If screws ④ , screws ⑤ and screws ⑥ are not tightened sufficiently, the contact between the terminals will deteriorate, possibly causing
malfunctioning so pay attention when tightening the screws. However, under no circumstances must power-driven screwdrivers or air
screwdrivers be used when installing the replacement P.C. board using such a device may damage the components.
(Tightening torque: screw ④ , ⑥ 1.2 ±0.1 N•m、screw ⑤ 0.55±0.1N ･ m)
(10) 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.
)
Parts name
239
Quantity
1
1
2