Outdoor Unit Control Pcb Replacement Procedure - Mitsubishi Heavy Industries KXZ 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:
WARNING
CAUTION
Securely exchange the PCB according to this procedure.
●
If the PCB 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 substrate.
●
The PCB exchange under current-carrying will cause an electric shock or fire.
After finishing the PCB exchange, check that wiring is correctly connected with the PCB before power distribution.
●
If the PCB is incorrectly exchanged, it will causean electricshock or fire.
Band 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.
2. (Be sure to measure voltage (DC) on Pin terminals 1-3 of CNA1 and check that the voltage is
discharged sufficiently. (Refer to Fig.2 ))
3. Disconnect the connectors from the controlPCB.
4. Disconnect the blue wiring passing through CT1 on the PCB before exchanging the PCB.
5. Match the setting switches (SW1-5) and jumper wires (J11-16) with the former PCB.
6. Tighten up a screw after passing blue wiring through CT1 of the changed.
7. Connect the connectors to the control 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.
CNA1
Parts No.
CT1
CNX2
CNX1
SW1 SW2
J11-16
SW3
SW4 SW5
CNEEV2
CNEEV1
WARNING
CAUTION
CNQ1 CNW CNZ1
CNB2 CNF2 CNP1
CNTH CNF1 CNU1
115
114
- -
– –
'14 • KX-SM-221
'14 • KX-SM-221
PCB012D046B
CNM1
CNN8
CNN1
CNN2
CNN3
CNR1
CNA2
CNFAN1
CNFAN2
CNV
CNI1
CNS1
CNL2
CNL1
CN17
Fig.1 Part arrangement view