Toshiba MMU-P0121H Service Manual page 133

3-7-3-8. How to replace IPDU P.C. board
IPDU P.C. board
Screw
Screw
IPDU P.C. board
Screw
CN11
n Procedure
(1) Be sure to turn off power supply of the outdoor unit before replacement work.
(2) Wait for 10 minutes or more after turning off power supply, measure to check the voltage between CN09 and
CN11 on IPDU P.C. board is 10V or less and then replace IPDU P.C. board.
(3) Remove all the connectors, faston terminals, and lead wires connected to IPDU P.C. board.
(4) Remove all screws at the four corners of IPDU P.C. board and four screws fixing the multi modules, which
are shown in the figure.
(5) After removing IPDU P.C. board, remove the supporters attached at the four corners of IPDU P.C. board and
reattach them to IPDU service P.C. board.
(6) Apply silicon grease to radiation surface of the multi module (surface which comes in contact with heat sink)
on IPDU service P.C. board.
(7) Install IPDU service P.C. board to the controller, and fix it with eight screws.
(8) According to the wiring diagram, connect connectors, faston terminals, and lead wires to IPDU service P.C.
board. In this time, do not forget to pass the lead wires through T02 and T03 on IPDU service P.C. board.
(9) Cover the outdoor unit, and check the operation by turning on power supply.
T02
Screw
1404A02Y
3-130
Screw
CN09
Screw
Screw
T03
Screw