MULTI TYPE

Procedure 2: Replacing P.C. Board
1 Replace the faulty P.C. board with a service P.C. board.
Be sure to replicate the old jumper setting (removal), switch setting (SW501), and connector short-circuit
setting (e.g. CN34) on the service P.C. board. (See the diagram at below.)
(MCC-1570)
CN34
(red)
J01
SW501
Connector for drain pump (CN504)
J02
The type and capacity of the indoor unit
are necessary for fan speed setting.
* Set the jumper wire J02 according to
the capacity class as shown below.
AP009~AP030
AP036~AP056
J02
Cut
Present (factory default)
If a short-circuiting plug had been used on the
replaced P.C. board, reuse it on the service P.C. board.
Be sure to set this jumper as required to make
the selection of a motor protection level possible.
(MCC-1402)
CN41
(MCC-1403)
CN041
CN34
CN030
From left: CN112, 111 and 110
If a short-circuiting plug had been used on the
replaced P.C. board, reuse it on the service P.C. board.
If a short-circuiting plug had been used on the replaced
P.C. board, reuse it on the service P.C. board.
2 It is necessary to establish a one-to-one correspondence between the indoor unit being serviced
and the remote controller.
Turn on the indoor unit using one of the methods described below according to the system configuration.
(1) Single (stand-alone) operation
Turn on the indoor unit and proceed to Procedure 3.
(2) Group operation
A) If it is possible to selectively turn on the indoor unit being serviced
Turn on the indoor unit being serviced and proceed to Procedure 3.
B) If it is not possible to selectively turn on the indoor unit being serviced (Case 1)
a) Temporarily disconnect the group control wiring from terminals A and B of the indoor unit being serviced.
b) Connect the remote controller wiring to the terminals, turn on the indoor unit, and proceed to Procedure 3.
* If this method cannot be used, proceed to the alternative method described below (Case 2).
C) If it is not possible to selectively turn on the indoor unit being serviced (Case 2)
a) Remove the CN41 connectors of all other indoor units in the same group.
b) Turn on the indoor unit and proceed to Procedure 3.
Case 1
Indoor unit
P.C. board
Indoor unit
P.C. board
Indoor unit (one being serviced)
Service P.C. board
Remove group control wiring from terminals
A and B of indoor unit being serviced, and
connect remote controller wiring.
A
B
A
B
A
B
Group control wiring
Remote controller
Case 2
Indoor unit
P.C. board
Indoor unit
P.C. board
Indoor unit (one being serviced)
Service P.C. board
CN
41
Remove CN41
connectors of all
other indoor units
in same group.
A B A B A B
Group control wiring
* Be sure to restore the temporarily removed group control wiring and CN41 connectors to their initial states after
Procedure 3 has been completed.
279
Remote controller