Kenwood TK-780 Service Manual Supplement

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

20TK-780/H INSTALLATION1. Accessory Connection Cable(KCT-19 : Option)The KCT-19 is an accessory connection cable for con-necting external equipment. The connector has 15 pins andthe necessary signal lines are selected for use.1-1. Installing the KCT-19 in the transceiver1. Remove the upper and lower halves of the transceivercase, and lift the DC cord bushing ( 1 ) from the chassis.2. Remove the pad as shown in Figure 1 ( 2 ).3. Insert the KCT-19 cable ( 3 ) into the chassis ( 4 ).The wire harness band ( 5 ) must be inside the chassis.4. Replace the DC cord bushing ( 6 ).5. Connect the KCT-19 to the TX-RX unit (A/2) as shown inFigure 2 ( 7 ).6. Connect the KCT-19 to the external accessory by insert-ing the crimp terminal ( 8 ) into the square plug ( 9 ),both of which are supplied with the KCT-19.131315 12Crimp terminal(E23-0613-05)BECBDCN6CN2CN4CN3DEBCAContactSquare plug(E09-1571-05)3467895CN112Fig. 1Fig. 21-2. KCT-19 Accessory Port FunctionNo. (A) No. (B,C,D,E) Name Function Note1 D-2 AHK External hook input *1BUSY System busy output2 D-5 ME Microphone ground *1AM Speaker audio mute input3 D-3 IGN Ignition sense input4 D-1 DEO Receiver detector output5 D-6 MI External microphone input *1TXS Transmitter sense output6 B-2 E Ground7 B-3 SB Switched B+, DC 13.6V output.Maximum 0.75A8 D-7 PTT External PTT input, active low.During DTC is low, it works asDATA PTT.9 D-4 DI Data modulation input10 B-1 HOR Horn alert/call output11 D-8 SQ Squelch detect output (Conventional)/Logic squelch output (LTR).12 C-1 SP Speaker audio output.13 E-1 CN2 LOK Link complete pulse output. *1and *2CN4CN2 AM Speaker mute input.14 E-2 CN4 RXD Serial control data input *2CN2 MM MIC mute input, active high.15 E-3 CN4 TXD Serial control data output. *2CN2 DTC Data control channel signal input,*1 Data channel : LowLOK Link complete pulse output..TXS Transmitter sense output,Active highFSW Foot switch input, active lowNote*1 : The functions of A-1, A-2, A-5, A-13 (when connector E is con-nected to CN2), and A-15 (when connector E is connected toCN2) are changed as described in the jumper chart.*2 : The functions of A-13, A-14 and A-15 are changed if the con-nector E is connected to CN2 or CN4 of the radio.No. CN2 CN4E-1 LOK/AM LOKE-2 MM RXDE-3 LOK/DTC/TXS/FSW TXD· Connect CN6 of the radio to connector C of the KCT-19 instead ofto the internal speaker connector, if use external speaker.