Kenwood TK-880 Service Manual

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23TK-880INSTALLATION6. PA/HA Unit (KAP-1 : Option)6-1. Installing the KAP-1 in the TransceiverThe Horn Alert (max. 2A drive) and Public Address func-tions are enabled by inserting the KAP-1 W1 (3P; white/black/red) into CN3 on the TX-RX unit, inserting W2 (3P;green) into CN5 on the TX-RX unit, and connecting the KCT-19 (option) to CN2 and CN3 of the KAP-1.• Installation procedure1. Open the upper case of the transceiver.2. Insert the two cables ( ) with connectors from theKAP-1 switch unit into the connectors on the transceiver.3. Secure the switch unit board to the chassis with a screw( ). The notch ( ) in the board must be placed at thefront left side.4. Attach the cushion on the top of the KAP-1 switch unit.13 2Fig. 623413W1W2CN1CN2KCT-19Cushion(G13-1710-04)CN3CN71CN3MPTTGNDSBTXAOTXAIRXAORXAIR571R529C4C3OPC2C1TX-RX unit (A/2)Component side viewTX-RX unit (B/2)Foil side viewCode 4 (C4)Code 3 (C3)Code 2 (C2)Code 1 (C1)(TX-RX PCB)(TX-RX PCB)(TX-RX PCB)(TX-RX PCB)(TX-RX PCB)(Cont. PCB)(Cont. PCB)(Cont. PCB)TXAI (TXAI)RXAI (RXAI)OPT (OP)MPTT (MPTT)SB (SB)GND (GND)RXAO (RXAO)TXAO (TXAO)R529DisableR571DisableTK-880Scrambler board( ) : PCB silk name(Cont. PCB)(Cont. PCB)(Cont. PCB)(Cont. PCB)Fig 56-2. Modifying the Transceiver• Horn alertThe signal from pin 4 of IC7 on the TX-RX unit turns Q4and Q6 on and off and drives KAP-1 HA relay to drive thehorn with a maximum of 2A.The default output is HR1. The relay open output can beobtained between HR1 and HR2 by removing R1 in the KAP-1.R1 Output formHR1 (Default) EnableHR2 DisableHR1HR1HR2