Toshiba MMD-AP0481HF2UL Service Manual

Also see for MMD-AP0481HF2UL: Service manual Owner's manual Installation manual Manual

– 106 –Procedure 2: replacing P.C. board1 Replace the faulty P.C. board with a service P.C. board.Be sure to replicate the old jumper setting (removal), and connector short-circuit setting (e.g. CN34) on theservice P.C. board. (See the diagram at below.)2 It is necessary to establish a one-to-one correspondence between the indoor unit beingserviced and the remote control.Turn on the indoor unit using one of the methods described below according to the system configuration.(1) Single (stand-alone) operationTurn on the indoor unit and proceed to Procedure 3.(2) Group operationA) If it is possible to selectively turn on the indoor unit being servicedTurn on the indoor unit being serviced and proceed to Procedure 3.B) If it is not possible to selectively turn on the indoor unit being serviced (Case 1)a) Temporarily disconnect the group control wiring from terminals A and B of the indoor unit beingserviced.b) Connect the remote control wiring to the terminals, turn on the indoor unit, and proceed toProcedure 3.* If this method cannot be used, proceed to the alternative method described below (Case 2).C) If it is not possible to selectively turn on the indoor unit being serviced (Case 2)a) Remove the CN041 connectors of all other indoor units in the same group.b) Turn on the indoor unit and proceed to Procedure 3.* Be sure to restore the temporarily removed group control wiring and CN041 connectors to their initial statesafter Procedure 3 has been completed.(MCC-1403) CN041CN030If a short-circuiting plug had been used on the replacedP.C. board, reuse it on the service P.C. board.Remove group control wiring from terminalsA and B of indoor unit being serviced, andconnect remote control wiring.Indoor unit (one being serviced)Service P.C. boardP.C. boardIndoor unitIndoor unitP.C. boardRemote controlGroup control wiringRemove CN041connectors of allother indoor unitsin same group.Case 1Case 2 Indoor unit (one being serviced)Service P.C. boardP.C. boardIndoor unitIndoor unitP.C. boardRemote controlGroup control wiring