Mitsubishi Electric MU-GD08ND, Service Manual

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11
8-2. Trouble criterion of main parts
$ $ :INNER PROTECTOR
TROUBLESHOOTING 8
8-1. Cautions on troubleshooting
1. Before troubleshooting, check the following:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after
confirming the horizontal vane is closed, turn OFF the breaker and / or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel,
the cabinet, the top panel and the electronic control P.C. board.
3) When removing the electronic control P.C. board, hold the edge of the
board with care NOT to apply stress on the components.
4) When connecting or disconnecting the connectors, hold the housing of the
connector. DO NOT pull the lead wires.
MU-C08VC MU-C10VC MU-C13VC MU-C18VC
Lead wiring
Housing point
Outdoor fan
motor (MF)
INNER FUSE
MU-GD08/GD12ND-
126 & 2 OPEN
MU-GD10ND-
145 OPEN
Measure the resistance between the terminals with a tester.
(Coil wiring temperature -10
o C ~ 40 o C)
WHT RED BLK
AUX.
MAIN
FUSE
Compressor (MC)
INNER
PROTECTOR
MU-GD08ND-
155 & 5 OPEN
90 & 10 CLOSE
MU-GD10/GD12ND-
150
&
5 OPEN
90 & 10 CLOSE
Part name Check method and criterion
Measure the resistance between the terminals with a tester.
(Coil wiring temperature -10
o C ~ 40 o C)
Figure
RED
WHT
BLK
P
C
S R
C1
C1
C1
C1
MU-GD08ND MU-GD10ND MU-GD12ND
MU-GD08ND
MU-GD10ND
MU-GD12ND
Color of
lead wire
Normal
MU-GD08ND-
C1
MU-GD10ND-
C1
MU-GD12ND-
C1
C-R 3.12 ~ 3.82 Ω 2.41 ~ 2.96 Ω 1.32 ~ 1.62 Ω
C-S 4.32 ~ 5.29 Ω 3.33 ~ 4.08 Ω 2.05 ~ 2.52 Ω
Color of
lead wire
Normal
MU-GD08ND -
C1
MU-GD10ND -
C1
MU-GD12ND -
C1
WHT-BLK 222 ~ 272 Ω 338 ~ 415 Ω 124 ~ 153 Ω
BLK-RED 245 ~ 300 Ω 228 ~ 280 Ω 154 ~ 189 Ω