Mitsubishi FDT125VNPWVH - (5) Outdoor unit control failure diagnosis circuit diagram

(5) Outdoor unit control failure diagnosis circuit diagram
◆Inspection of resistance value of sensor Remove the connector and check the resistance value. See the section of sensor characteristics on page 83-85.
◆Inspection of outdoor fan motor See page 90.
Display Voltage range
◆Voltage check in PCB The normal range is as follows.
①DC 20V DC 18ーDC 22 V ②DC 15V DC 14ーDC 16 V ③DC 13V DC 11ーDC 14 V ④DC 5V DC 4ーDC 6 V ⑤DC 2.5V DC2.3ーDC 2.7 V
◆Power source and serial signal inspection
L to N : AC220/230/240V 1 to 2/N : AC220/230/240V 2/N to 3 : Normal if the voltage oscillates between
DC 0 and approx. 20V
● Voltage check point (PCB ASSY PCB1)
Voltage C93
15V voltage for fan motor control
Voltage C213 13V voltage for EEV
Voltage C79 5V voltage for CPU
Voltage C150 20V voltage for communica�on to indoor unit
PCB ASSY PCB2
Voltage C502
2.5V voltage for current detec�on
amplifier
②
③
⑤
①
④
CAUTION
-
HIGH VOLTAGE
High voltage is produced in the control box. Don't touch electrical parts in the control box for 5 minutes after the
unit is stopped.
Color
Color symbol
RD
Mark
Yellow／GreenY／G BlackBK BlueBL YellowYE WhiteWH Red
◆
Check point of outdoor unit
'22 • PAC-SM-412
-
47
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