Toshiba MMU-AP0091H service manual Procedure 2 Exchange of P.C. board for service, 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) JP1 CN41 (MCC-1403) JP001 CN041

CN34

From the left

CN112,111,110

CN030

When short-circuited plug is mounted to P.C. board before change, re-mount the short-circuited plug as previons.

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.

Indoorunit	Indoorunit	Indoorunit Service P.C. board of
P.C. board	P.C. board	the unit to be changed

(Case 1)

A B A B

A B

Remove the group wire of the

terminal blocks A and B of the

(Case 2)

Remove CN41 connectors of the indoor units other than the units to be changed in the same group.

	Group wire
Indoorunit	Indoorunit
P.C. board	P.C. board

	CN
	41
A B	A B

Group wire

Remote	changed indoor unit, and then
controller	install the remote controller only.

Indoorunit Service P.C. board of the unit to be changed

A B

Remote controller

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