Fdtc Series; Replace The Pcb - Mitsubishi Heavy Industries SRK20ZSX-W Service Manual

(i)

FDTC series

Replace and set up the PCB according to this instruction.
1) Set to an appropriate address and function using switch on PCB.
Select the same setting with the removed PCB.
Item
Address
Test run
2) Set to an appropriate capacity using the model selector switch(SW6).
Select the same capacity with the PCB removed from the unit.
SW6
25VH
35VH
50VH
60VH

3) Replace the PCB

a) Unscrew terminal (Arrow A) of the "E1" wiring (yellow/green) that is connected to PCB.
b) Replace the PCB only after all the wirings connected to the connector are removed.
c) Fix the board such that it will not pinch any of the wires.
①Replace the pwb
d) Switch setting must be same setting as that of the removed PCB.
1. Unscrew terminal(Arrow A) of the "E1" wiring(yellow/green) that is connected to pwb. e) Reconnect the wirings to the PCB. Wiring connector color should match with the color of connector of the PCB.
2. Replace the pwb only after all the wirings connected to the connector are removed.
f) Screw back the terminal (Arrow A) of the "E1" wiring, that was removed in a).
3. Fix the board such that it will not pinch any of the wires.
4. Switch setting must be same setting as that of the removed pwb.
4) Control PCB
5. Reconnect the wirings to the pwb. Wiring connector color should match with the color of connector of the pwb.
6. Screw back the terminal(Arrow A) of the "E1" wiring, that was removed in 1.
Parts mounting are different by the kind of PCB.
②Control pwb
Parts mounting are different by the kind of pwb.
CNH (Black)
CNTA (Blue)
CNL (Black)
CNC (White)
CNT (Blue)
CNN (Yellow)
LED2 (Green)
CNI (Blue)
CNJ1 (White) CNJ2 (Grey)
Switch
SW2 Plural indoor units control by 1 remote control
OFF
SW7-1
ON
SW6
-1 -2 -3 -4
ON
ON OFF OFF OFF
OFF ON OFF OFF
ON OFF ON OFF
1
ON ON ON OFF
Example setting for 25VH
LED3 (Red) CNR (White)
SW7
CNB (Black)
Content of control
Normal
Operation check/drain motor test run
2 3 4
SW5 CNW3 (White)
SW2
SW6
104
- -
'19 • SCM-SM-276
PSC012D050
CNW0 (White)
A
CNM1(White)
Part number
C