Outdoor Unit Control Pcb Replacement Procedure; Precautions For Safety; To Exchange The Control Pcb - Mitsubishi Heavy Industries FDC280KXZE1 Service Manual

2.4 Outdoor unit control PCB 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 replace PCB according to this following instruction.
If PCB is incorrectly replace, it will cause an electric shock or fire.
¡ Be sure to check that the power source for the outdoor unit is turned OFF before replacing PCB, The PCB re-
placement under current-carrying will cause an electric shock.
¡ After finishing PCB replacement, check that wiring is correctly connected with the PCB before power distribution.
If the PCB is incorrectly replaced, it will cause an electric shock or fire.
¡ Bundle the wiring so as not to tense because it will cause an electric shock.
Exchange the control PCB according to the following procedure.
1. Exchange the PCB after elapsing 3 minutes from power OFF.
(Be sure to measure voltage (DC) and check that the voltage is discharged sufficiently. (Refer to Fig.1))
2. Disconnect the connectors from the PCB.
3. Disconnect the blue wiring passing through CT1 and CT2 on the PCB before exchanging the PCB.
4. Match the setting switches (SW1-6) and jumper wires (J11-J16) with the former PCB.
5. Tighten up a screw after passing blue wiring through CT1 and CT2 of the changed. (If the CT2 is not assembled, only CT1.)
6. Connect the connectors to the PCB. (Confirm the connectors are not half inserted.)

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.
CNEEV１
SW3 SW5
SW1 SW2
SW4 SW6
J11-16
CNTH
CT1
CT2
CNP2
CNB4
CNC2
CNU2
CNB2
CNU1
CNF2
CNF1
CNP1
CNL1
CNL2
CNB3
CNS1
CNS2
（※１）
CNG
CNG
CNI1
CNN12
CNN5
CNR2
CNM2
CNN11
CNN7
CNN9
Fig.1 Parts arrangement
WARNING
CAUTION
CNEEV４
CNFAN1
CNEEV３
CNQ1
CNEEV２
CNFAN2
CNN3
CNN6
CNN2
CNR1
CNN1
CNM1
CNN8
124
– –
'14 • KX-SM-202
PCB012D046A
CNQ2
CNW
CNX1
CNA3
CNA1
Parts No