Toshiba MMU-AP0091H service manual Interface Board Replacement Procedure, Replacement steps, 224

17-2-5. Interface Board Replacement Procedure

This service board is commonly installed in different models. If the board assembly is to be replaced, check the displayed inspection contents and replace the board with the correct version for the model and follow this procedure.

Replacement steps

1.Turn off the power supply of the outdoor unit.

2.Remove the connectors, fasteners and screw terminals connected to the interface P.C. board.

3.Remove the interface P.C. board from the six card edge spacers.

4.Disconnect the jumper wires of the service board, as instructed in the table below. The jumper setting differs from the one to be replaced.

If the model is not specified, inspection code “L10” is displayed and the equipment will not operate.

No.	Model name	J09	J10	J11
At shipment	Service P.C. board	Yes	Yes	Yes
1	MMY-MAP0802FT8-INV	Disconnect	Disconnect	Leave intact
2	MMY-MAP1002FT8-INV	Leave intact	Disconnect	Leave intact
3	MMY-MAP1202FT8-INV	Disconnect	Leave intact	Leave intact

5. Set dip switch settings of the service board to the switch settings detailed below before replacement.

Dip Switch	Setting contents
SW07	Demand setting
SW10	Outdoor fan high static pressure setting, etc.
SW13	System address setting
SW14
SW30	Terminating resistance setting

6.After setting the jumper wires of the service board, install the service board in the outdoor control unit (Confirm that it is securely fixed to the card edge spacers.)

7.Connect the connector and fasten terminals (confirm that they are correctly and securely inserted).

8.If a component part on the board is bent during board replacement, adjust it manually so that it is not in contact with other parts/components.

9.Install the cover then turn on the power supply. Check the operation.

Jumper wire replacement place (J09, 10, 11)

	IC02
	IC01
IC300	IC301
	CN314
CN311
	224