– 98 –
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.)
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
.
* Be sure to restore the temporarily removed group control wiring and CN41 connectors to their initial states after
Procedure 3 has been completed.
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.
From left: CN112, 111 and 110
Remove group control wiring from terminals
A and B of indoor unit being serviced, and
connect remote controller wiring.
Indoor unit (one being serviced)
Service P.C. board
P.C. board
Indoor unit
Indoor unit
P.C. board
Remote controller
Group control wiring
Remove CN41
connectors of all
other indoor units
in same group.
Case 1
Case 2
Indoor unit (one being serviced)
Service P.C. board
P.C. board
Indoor unit
Indoor unit
P.C. board
Remote controller
Group control wiring
Summary of Contents for MMC-AP0154H-E(-TR)
Page 145: ... 145 ...
Page 149: ... 149 9 2 1 Way cassette type SH 4 2 0 P A 8 1 0 P A 5 1 0 P A ...
Page 156: ... 156 MMU AP0056MH ...
Page 159: ... 159 9 4 Slim duct type MMD AP0054SPH AP0074SPH AP0094SPH AP0124SPH AP0154SPH AP0184SPH ...
Page 162: ... 162 MMD AP0056MH ...
Page 165: ... 165 9 5 Concealed duct standard type MMD AP0074BH AP0094BH AP0124BH AP0154BH AP0184BH ...
Page 166: ... 166 ...
Page 169: ... 169 MMD AP0244BH AP0274BH AP0304BH AP0364BH AP0484BH ...
Page 170: ... 170 ...
Page 173: ... 173 MMD AP0564BH ...
Page 174: ... 174 ...
Page 177: ... 177 E Parts ...
Page 179: ... 179 9 6 Concealed duct high static pressure type MMD AP0184H AP0244H AP0274H AP0364H AP0484H ...
Page 183: ... 183 MMD AP0724H AP0964H ...
Page 184: ... 184 ...
Page 187: ... 187 9 7 Ceiling type MMC AP0154H AP0184H AP0244H AP0274H ...
Page 190: ... 190 MMC AP0364H AP0484H ...
Page 194: ... 194 9 8 Floor standing type MMF AP0154H AP0184H AP0244H AP0274H ...
Page 195: ... 195 MMF AP0154H AP0184H AP0244H AP0274H ...
Page 198: ... 198 MMF AP0364H AP0484H AP0564H ...
Page 199: ... 199 MMF AP0364H AP0484H AP0564H ...
Page 203: ... 203 9 9 Floor standing concealed type MML AP0074BH AP0094BH AP0124BH AP0154BH AP0184BH ...
Page 206: ... 206 MML AP0244BH ...
Page 209: ... 209 9 10 Floor standing cabinet type MML AP0074H AP0094H AP0124H AP0154H AP0184H ...
Page 210: ... 210 MML AP0074H AP0094H AP0124H AP0154H AP0184H ...
Page 213: ... 213 MML AP0244H ...
Page 214: ... 214 MML AP0244H ...