Kenwood TK-780 Service Manual

Also see for TK-780 series: Programming instructions Instruction manual Service manual supplement Instruction manual Service manual

23TK-780INSTALLATION6-2. Modifying the Transceiver• Horn alertThe signal from pin 4 of IC7 on the TX-RX unit (A/2) turnsQ4 and 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 DisableHR1HR1HR26. 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 (A/2), inserting W2(3P; green) into CN5 on the TX-RX unit (A/2), and connectingthe 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 ( 1 ) 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( 3 ). The notch ( 2 ) in the board must be placed at thefront left side.4. Attach the cushion on the top of the KAP-1 switch unit.Fig. 623413W1W2CN1CN2KCT-19Cushion(G13-1710-04)CN3CN51CN3MPTTGNDSBTXAOTXAIRXAORXAIR571R529C4C3OPC2C1TX-RX unit (A/2)Component side viewTX-RX unit (B/2): Control sectionFoil side viewCode 4 (C4)Code 3 (C3)Code 2 (C2)Code 1 (C1)(TX-RX A/2 PCB)(TX-RX A/2 PCB)(TX-RX A/2 PCB)(TX-RX A/2 PCB)(TX-RX A/2 PCB)(TX-RX B/2 PCB)(TX-RX B/2 PCB)(TX-RX B/2 PCB)TXAI (TXAI)RXAI (RXAI)OPT (OP)MPTT (MPTT)SB (SB)GND (GND)RXAO (RXAO)TXAO (TXAO)R529DisableR571DisableTK-780Scrambler board( ) : PCB silk name(TX-RX B/2 PCB)(TX-RX B/2 PCB)(TX-RX B/2 PCB)(TX-RX B/2 PCB)Fig 5