Outdoor Unit Control Pcb Replacement Procedure; Precautions For Safety - Mitsubishi Heavy Industries KX6 series 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:
Indicates an imminently hazardous situation which will result in death or serious injury if
WARNING
proper safety procedures and instructions are not adhered to.
CAUTION
Indicates a potentially hazardous situation which may result in minor or moderate injury
if proper safety procedures and instructions are not adhered to.
¡ 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 replace PCB,
The PCB replacement 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 PCB is incorrectly replace, it will cause an electric shock or fire.
¡ Bundle the wiring so as not to tense because it will cause an electric shock.
(Note) If cut the tie, the wiring cables should be bound with new tie again.
• Exchange the control PCB according to the following procedure.
1. Replace the control PCB after elapsing 3 minutes from power OFF.
(Be sure to measure voltage (DC) at both capacitor terminals (1. Power supply for PCB 2. Power supply for fan motor)
and check that the voltage is discharged completely. (Refer to Fig.1))
2. Disconnect the connectors from the PCB.
3. Disconnect the blue wiring passing through CT1 on the PCB before replace the coutrol PCB.
4. Set the setting switches (SW1-6) of new PCB same as previous PCB.
5. Tighten up a screw after passing blue wiring through CT1 of the changed.
6. Connect the connectors to the PCB. (Contirm the connectors are not half inserted.)
CNEEV2
CNEEV1
CNTH
CT1
CNB2
CNU1
CNF2
CNF1
CNP1
CNL1
CN 2
CNS1
CNS2
CNG1
CNG2
CNI

Precautions for Safety

WARNING
CNQ3
CNFAN_2
CNFAN_1
CNA2 2
CNN2
CNN1
CNN6 CNR1 CNM1
Parts arrangement view
CAUTION
2
CNQ1
CNW
CNX1
After elapsing 3 minutes
1 Reuse the parts used before the PCB exchange.
2 Please do not carry out wrong insertion.
The PCB will be destroyed if a mistake is made
in putting CNA2 (brown) and CNQ3 (yellow).
97
- -
'10 • KX-SM-148
PCB012D017F
from power OFF
CNQ3
CNA2