Check Of Outdoor Unit - Mitsubishi Electric MUX-19TV - E1 Service Manual

Check of outdoor unit

D
Compressor and outdoor fan do not operate.
Start
Check the voltage of terminal block outdoor unit
L - N.
AC220~240V between
Check the voltage of terminal block of indoor
unit. Is there 12V DC to terminal block between
1 and 2.
Check the voltage of terminal block of outdoor
unit. Is there 12V DC to terminal block between
1 and 2.
Turn OFF power supply to the indoor unit and the outdoor
unit.
Is fuse F61 blown?
Replace the fuse.
Replace outdoor control P.C. board.
No
Yes
No
Yes
No
Yes
No
Yes
Check the outdoor power supply and connection.
Reconfirmed
Check the indoor unit control P.C. board.
Refer to the service manual No.OB227 REVISED
EDITION-B page 121.
Check continuity of indoor and outdoor unit conec-
tion.
Remove connector from outdoor control P.C. board CN71~CN74, CN90,
and continuity confirmation next (1) ~ (8).
(1) Between CN71 1 pin and 1 of A room of the outdoor terminal block.
(2) Between CN71 3 pin and 2 of B room of the outdoor terminal block.
(3) Between CN73 1 pin and 1 of B room of the outdoor terminal block.
(4) Between CN73 3 pin and 2 of B room of the outdoor terminal block.
(5) Between CN74 1 pin and 1 of C room of the outdoor terminal block.
(MUX20TV only)
(6) Between CN74 3 pin and 2 of C room of the outdoor terminal block.
(MUX20TV only)
(7) Between CN90 1 pin and L of the outdoor terminal block.
(8) Between CN90 3 pin and N of the outdoor terminal block.
Yes
All continuity in the upper (1) ~ (8).
No
Exchange the wiring whith continuity is no in.
29