Mitsubishi Electric SRK100VNPZJX Technical Manual Download Page 347

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346

'12 • PAC-T-174

(c) Outdoor inverter PCB replacement procedure

Precautions for Safety

• Since the following precaution is the important contents for safety, be sure to observe them.
WARNING and CAUTION are described as follows:

WARNING

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.

CAUTION

WARNING

• Securely replace the PCB according to this procedure.
If the PCB is incorrectly replaced, 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 the
PCB. The PCB replacement under current-carrying will cause an electric shock or fire.
• After finishing the 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.

CAUTION

• Band the wiring so as not to tense because it will cause an electric shock.

Replace the inverter PCB according to the following procedure.

！

1) Model FDC71VN

a) Replace the PCB

after elapsing 3 minutes from power OFF.

(

Be sure to measure voltage (DC)

between T26 and T27 on inverter PCB, and

check that the voltage is

discharged sufficiently (10V or less)

. (Refer to Fig.1))

Take off the connection of inverter PCB terminal and connector, and remove the screw of power transistor (IC10),

active filter (IC2), and diode stack (DS1) then remove the PCB. Wipe off the silicon grease neatly on the controller’s
radiation heat fins. (Refer to Fig.1 and 2)
c) Refer to table1 for the setting of switch (JSW10, 11) of new PCB.
d)

Before installing the power transistor (IC10), active filter (IC2), and diode stack (DS1) on the new PCB, apply

silicon grease equally to the their surface. (Make full use of the silicon grease.)

They may be damaged unless

they apply it

Tighten the screw of power transistor (IC10), active filter (IC2), and diode stack (DS1) on inverter PCB and connect

terminal and connector. Confirm the connection and there is not the half insertion.

Tighten properly power

transistor, (IC10) active filter (IC2), and diode stack (DS1) with a screw and make sure there is no

slack. They can be damage if not properly tighten.

(Recommended tightening torque: power transistor

(IC10)1.2±0.1 and active filter (IC2)0.98±0.1, diode stack(DS1) 0.5±0.1 Unit N·m

-1

OFF

-1

-2

OFF

-2

-3

OFF

-3

OFF

JSW10

-4

OFF

JSW11

-4

OFF

Parts arrangement view

Fig. 1 Position of fastontab and terminal

Table. 1 Switch setting

T24

(YELLOW)

CNI4

T27

(BLUE)

T25

(YELLOW)

T26

(RED)

T28 (RED)

CNG2

T22

(WHITE)

T21

(RED)

Voltage measurement point
(T26 (red), T27 (blue))

T30 (BLUE)

T29(WHITE)

Parts No.

JSW11

JSW10

CNI2

CNO1

SCREW OF POWER TRANSISTOR

(IC10)

SCREW OF DIODE STACK

(DS1)

SCREW OF ACTIVE FILTWER

(IC2)

after elapsing 3 minutes
from power OFF

Connectors are
not half inserted

Model FDC100VN, 125VN, 140VN

a) Replace the PCB

after elapsing 3 minutes from power OFF

(

Be sure to measure voltage (DC)

on both capacitor terminals located in controller back, and

check that the

voltage is discharged sufficiently

.(Refer to Fig.1))

b) Take off the connection of inverter PCB terminal block connector and remove the screw of power transistor then

remove the PCB. Wipe off the silicon grease neatly on the controller’s radiation heat fins.

c) Refer to table1 for the setting of switch (JSW10,11) of new PCB.

d) Before installing the power transistor on the new PCB,Apply uniformly a bundled of silicon grease first on the

surface of power transistor.Make sure it is applied to prevent damage on power transistor.

e) Tighten the screw of power transistor on inverter PCB and connect the terminal block.Confirm the connection and

don’t use soldering in the connection.Tighten properly the power transistor with a screw and make sure there is no
clearance gap.Power transistor can be damage if not properly tighten.(Recommended power transistor tightening
torque:0.98~1.47N∙m)

TB1

TB11

Parts No.

Parts arrangement view

Fig.1 Position of capacitor

TB2

TB10

TB5

TB6

Connector

CNI2

CNI4