Interface Board Replacement Procedure - Carrier MMY-MAP0724FT9UL Service Manual

14-3. Interface board replacement procedure

Parts code Description
4316V519 Interface P.C. Board
This Interface board is commonly installed in different models before shipment. When the board assembly is to
be replaced, check the displayed inspection contents below and replace the board in accordance with the
model, following the below procedure.
Replacement steps:
(1) Turn off the power supply of the outdoor unit.
(2) Remove all of the connectors and fast-on terminals connected to the interface board. (Remove the
connectors and fast-on terminals by pulling the connector body. Do not pull the wire).
(3) Remove the interface board from the six PCB mounts (
(4) Cut the jumper wires of the service board, as instructed in the table below.
The jumper setting differs from original supplied PCB, therefore be sure to configure the Jumpers as in the
table below.
If the model is not specified, inspection code "L10" is displayed and the equipment will not operate.
Model name
Service P.C. Board
MMY-MAP0724FT9UL
MMY-MAP0964FT9UL
MMY-MAP1204FT9UL
MMY-MAP0724FT6UL
MMY-MAP0964FT6UL
MMY-MAP1204FT6UL
Interface P.C.Board
(431-6V-519)
Dip Switches
SW06 SW07 SW09
SW11 SW12 SW13
SW16 SW17
Jumpers
(5) Set the dip switch settings of the service board to match the switch settings of the PCB being replaced.
(6) Install the service board to the outdoor control unit (Confirm that it is securely fixed to the PCB Mounts).
(7) Connect the connectors and fast-on terminals (Confirm that they are correctly and securely inserted).
(8) If a component on the board is bent during board replacement, adjust it manually ensuring that it is not
short or contact other parts.
(9) Install the cover, then turn on the power supply. Check the operation.
Applicable model
MMY-MAP0724FT9UL
MMY-MAP0964FT9UL
MMY-MAP1204FT9UL
MMY-MAP0724FT6UL
MMY-MAP0964FT6UL
MMY-MAP1204FT6UL
J12 J11
Yes Yes
— —
Cut Cut
Cut Cut
— —
Cut Cut
Cut Cut
1
SW10
SW14
1
1
P.C. board type code
MCC-1606
1
).
J10 J09
Yes Yes
Cut —
Cut Cut
Cut —
Cut —
Cut Cut
Cut —
– 245 –
Product code
ASM-PCB(I/F)
J22 J25
Yes Yes
— Cut
— Cut
— Cut
Cut Cut
Cut Cut
Cut Cut
1
1
Push this part to the
direction of the arrow.
And remove the PCB.
PCB Mounts
1
1