Diagnostic Procedure For Each Check Code (Indoor Unit) - Toshiba MMU-AP0057MH-E Service Manual

8-5. Diagnostic Procedure for Each Check Code (Indoor Unit)

* Please refer to the multi outdoor unit service manual excluding these.
[P12 trouble]
Power off.
Is not
connection trouble or
disconnection on the connector
CN210 of indoor unit
P.C. board?
NO
Disconnect the connector CN210 to
the indoor P.C. board
Does the
fan turn smoothly when
turned by hand?
YES
Is each
resistance value
on the motor side of the
fan motor connector CN210
of the indoor P.C.
board correct?
YES
Is F01 of the
indoor P.C.
board open?
NO
Is R04 or R05
of the indoor P.C.
board open?
NO
YES
NO
NO
Model name for the indoor fan motor.
ICF-340D60-1
<Checking procedure>
Measure the resistance of the following terminals with the tester.
Internal motor circuit is damaged if the measured value is out of
the range in below table.
Pin No. 7 6 5
Color Blue Yellow White
Measure by connecting the com side to 4 (Black) while measuring.
The measurement may vary.
Measurement place
I. Between 4 (Black) - 1 (Red)
II. Between 4 (Black) - 5 (White)
III. Between 4 (Black) - 6 (Yellow)
IV. Between 4 (Black) - 7 (Blue)
[Action if the measurement is out of the range]
If any measurement in the above table is between 0 to several
100 Ω, replace the indoor P.C. board together with the motor since
the indoor P.C. board is damaged.
YES
YES
– 81 –
Repair the connector
connection.
Replace the indoor
fan motor.
Replace the indoor
fan motor.
4 3 2 1
Black — — Red
Resistance value
a, b, c
∞
(MΩ)
35k – 65kΩ
130k – 170kΩ
∞
(MΩ )
Replace the indoor P.C.
board (MCC-1643).
Replace the indoor P.C.
board (MCC-1643).
Check the indoor P.C.
board (MCC-1643).
If failure Replace