Toshiba A90-0132, Service Manual

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Replacing the interface PC board
Interface PC board replacement procedure
How to replace the interface PC board - MCC-1343-03
The service interface PC board is common to all MMS outdoor models.
Replace the PC board according to the following procedure:
(1) Turn off the power supply of the outdoor unit.
(2) Remove all the connectors and fasten terminals connected to the interface PC board.
(Remove the connectors without grasping the leads)
(3) Remove the interface PC board from the mounting clips.
(4) Cut the jumper link of the service PC board according to the table below:
Inverter unit - heat pump model
Outdoor model Electrical box label Jumper No. Service PC board label
J-02 J-05 J-06 J-07 J-08 J-09 J-22
MM-A0280HT MMY-MP1001HT8-INV cut - - - - - - MMY-INV
MM-A0224HT MMY-MP0801HT8-INV cut - - cut cut cut - MMY-INV
Fixed-speed unit - heat pump model
Outdoor model Electrical box label Jumper No. Service PC board label
J-02 J-05 J-06 J-07 J-08 J-09 J-22
MM-A0280HX MMY-MP1001H8-E-P cut cut - - - - - MMY-E-P
MM-A0224HX MMY-MP0801H8-E-P cut cut - cut cut - - MMY-E-P
MM-A0160HX MMY-MP0601H8-E-P cut cut cut cut - cut - MMY-E-P
Inverter unit - cooling only model
Outdoor model Electrical box label Jumper No. Service PC board label
J-02 J-05 J-06 J-07 J-08 J-09 J-22
MM-A0280CT MMY-MP1001HT8-INV cut - - - - - cut MMY-INV
MM-A0224CT MMY-MP0801HT8-INV cut - - cut cut cut cut MMY-INV
Fixed-speed unit - cooling only model
Outdoor model Electrical box label Jumper No. Service PC board label
J-02 J-05 J-06 J-07 J-08 J-09 J-22
MM-A0280CX MMY-MP1001H8-E-P cut cut - - - - cut MMY-E-P
MM-A0224CX MMY-MP0801H8-E-P cut cut - cut cut - cut MMY-E-P
MM-A0160CX MMY-MP0601H8-E-P cut cut cut cut - cut cut MMY-E-P
(5) From the tables above confirm the jumper status and PC label matches the required outdoor unit.
(6) Insert the PC board into the electrical control box ensuring the PC board is secured by the 7 supporting clips.
(7) Insert the connectors and the fasten terminals.
(8) Check there is no insertion error and that all components are vertical.
(9) Replace electrical control box cover and outer painted panel.
(10) Turn on power supply and check the operation of the outdoor unit is normal.
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