Toshiba Carrier MMU-AP0182H2UL Service Manual page 148

C) In case that power of the indoor units cannot be turned in individually. (
a) Remove all CN41 connectors of the indoor units in the same group except those of the exchanged
indoor unit.
b) Turn on power of the indoor units and proceed to Procedure 3
∗ After Procedure 3 operation has finished, be sure to return the temporarily removed group wire
or CN41 connector to the original connection.
Indoor unit
(Case 1)
Indoor unit
(Case 2)
Remove CN41 connectors of the indoor units other
than the units to be changed in the same group.
P.C. board parts layout drawing
Method of DIP switch setting
Bit 1 Terminator resistor (for central control)
SW01
Bit 2 Remote controller A/B selection
Bit 1 Custom / Multi model selection
SW02
Bit 2 No use
∗1 : Match to set up contents of P.C. board before replacement.
P.C. board
A B A B
Group wire
P.C. board
CN41
A B A B
<MCC-1510>
SW01
ON 2
1
IC10
Selected content
Indoor unit
Service P.C. board of the unit to be changed
A B
×
Remote
controller
Indoor unit Service P.C. board of the unit to be changed
A B
Group wire
Remote
controller
SW02
1 ON
2
DIP switch (SW01, SW02)
J01
EEPROM (IC10)
MMK-AP 3H2UL series
1
1
ON
OFF
148
CASE 2
)
Remove the group wire of the
terminal blocks A and B of the
changed indoor unit, and then
install the remote controller only.
At shipment
OFF (Without terminator)
OFF (A selection)
OFF
OFF