Toshiba R410A Service Manual page 219

Procedure 2 : Exchange of P.C. board for service
1. Exchange P .C. board with a P .C. board for service.
In this time, the jumper line (cut) setup or the (short-circuit) connecting connector setup on the previous P .C.
board should be reflected on P .C. board for service. (See the blow figures.)
(MCC-1402)
CN34
2. It is necessary to set Indoor unit to be exchanged : Remote controller = 1 : 1
Based upon the system configuration, turn on power of the indoor unit with one of the following items.
1) Single (Individual) operation
Turn on power of the indoor units and proceed to Procedure 3.
2) Group operation
A) In case that power of the exchanged indoor unit only can be turned on
Turn on power of the exchanged indoor unit only and proceed to Procedure 3.
B) In case that power of the indoor units cannot be turned on individually ( Case 1 )
a) Remove temporarily the group wire connected to the terminal blocks A and B of the exchanged
indoor unit.
b) After connecting the remote controller wire only to the removed terminal block, turn on power of the
indoor units and proceed to Procedure 3.
When the above methods cannot be used, follow to the two cases below.
C) In case that power of the indoor units cannot be turned on individually ( Case 2 )
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.
(Case 1)
(Case 2)
Remove CN41 connectors
of the indoor units other
than the units to be changed
in the same group.
JP1 CN41
From the left
CN112,111,110
When short-circuited plug is mounted to P.C. board before
change, re-mount the short-circuited plug as previons.
Indoorunit Indoorunit
P.C. board
A B
Group wire
Indoorunit Indoorunit
P.C. board
CN
41
A B
Group wire
(MCC-1403)
Indoorunit Service P.C. board of
P.C. board
A B
Remote
controller
Indoorunit Service P.C. board of
P.C. board
A B
Remote
controller
219
JP001 CN041
CN030
the unit to be changed
A B
Remove the group wire of the
terminal blocks A and B of the
changed indoor unit, and then
install the remote controller only.
the unit to be changed
A B