Outdoor Unit Transistor Module Replacement Procedure - Mitsubishi Heavy Industries Hi-COP Series Service Manual

2.6 Outdoor unit transistor module replacement procedure

Since the following precaution is the important contents for safety, be sure to observe them.
・
WARNING and CAUTION are described as follows:
WARNING
！
！ CAUTION
・ Securely exchange the transistor module according to this procedure.
If the transistor module is incorrectly exchanged, it will cause an electric shock or fire.
・ Be sure to check that the power source for the outdoor unit is turned OFF before exchanging the transistor module. The
transistor module exchange under current-carrying will cause an electric shock.
・ After finishing the transistor module exchange, check that wiring is correctly connected with the transistor module before
power distribution. If the transistor module is incorrectly exchanged, it will cause an electric shock or fire.
・ Band the wiring so as not to tense because it will cause an electric shock.
Exchange the transistor module according to the following procedure.
1. Exchange the transistor module after elapsing 3 minutes from power OFF.
(Be sure to measure voltage (DC) on both capacitor terminals (P, N of transistor module or connector terminals of
fan motor power etc.) , and check that the voltage is discharged sufficiently.)
2. Disassemble the control box.
3. Disconnect with the wire (U, V, W, P, N ) to the transistor module. (Refer to Fig.1 Parts arrangement view)
4. Pull up the inverter PCB from transistor module. Remove transistor module after removing the screw for transistor
module.
5. Attach the transistor module. Coat the transistor module where its reverse-side all over with accessories silicone
grease uniformly.
6. Set the inverter PCB with make sure of connect connector.
7. Connect with the wire (U, V, W, P, N ) to the transistor module.
8. Assemble the control box as before.
(Blue)
(Red)
Precautions for Safety
Indicates an imminently hazardous situation which will result in death or serious injury if proper safety
procedures and instructions are not adhered to.
Indicates a potentially hazardous situation which may result in minor or moderate injury if proper safety
procedures and instructions are not adhered to.
Connector connected by inverter PCB
N
P
Fig.1 Parts arrangement view
！ WARNING
!
！ CAUTION
U V
(Red) (White)
129
– –
'14 • KX-SM-204
PCB012D043
W
(Blue)