Kenwood TK-790 Service Manual

Also see for FleetSync TK-790: Specifications Instruction manual Specifications Instruction manual

18TK-790/(B)/H(B)5. Ignition Sense Cable (KCT-18)The KCT-18 is an optional cable to use the following func-tions:5-1. Ignition functionThe ignition function allows you to turn the transceiver'spower on and off with the ignition key of your car. Whenyou are driving with the ignition key on, the horn alert func-tion is disabled.5-2. Timed power off functionThe timed power off function turns the transceiver'spower off the time specified with the programming soft-ware (KPG-44D) after the ignition key is turned off. Whenyou are driving with the ignition key on, the horn alert func-tion is disabled.The ignition sense function and the timed power off func-tion can be used at the same time.5-3. Modification• If the TK-790 and KCH-10 or KCH-11 are used1. Remove the short plug from the accessory connector (9pins) on the back of the transceiver.2. Insert the KCT-18 into pin 1 (IGN).3. Remove the upper half of the case of the TK-790.4. Set jumper resistors (0 ohm), R504, R506, R742 andR743, on the control unit (X57-561 B/3) as shown inTable 1 (Refer to page 21).5. Reinstall the upper half of the case.• When the remote kit is usedIf the accessory connector (9 pins) on the rear of thetransceiver is available, use the method described above. (Ifthe KRK-7DB or KRK-8DBH is used, use the accessory con-nector (9 pins) on the back of radio 1.)If the accessory connector (12 pins) on the back of thecontrol head is used:1. Remove the plug from the accessory connector (12 pins)on the back of the control head.2. Cut off the end of the rubber cap (accessory), insert theKCT-18 into the cap, and insert it into pin 1 (IGN) of theshort plug.3. Install the short plug and rubber cap on the connector onthe rear of the control head, then clamp the bottom of therubber cap with the supplied tie wrap.4. Remove the upper half of the case of the TK-790.5. Set jumper resistors (0 ohm), R504, R506, R742 andR743, on the control unit (X57-561 B/3) as shown inTable 1 (Refer to page 21).6. Reinstall the upper half of the case.Note : If the KCT-18 is used for the KRK-8DBH, use the 9-pinplug on the back of radio 1 or the 12-pin plug on the back ofhead 1. The plugs on radio 2 and head 2 cannot be used.If the KCT-18 is used for the KRK-7DB, use the 9-pin plug onthe back of radio 1 or the 12-pin plug on the back of thehead. The plug on radio 2 cannot be used.Available function when KCT-18 is R504 R506 R742 R743connectedHorn alert function OFF during Present Absent Present Absentdriving, Timed power off function(Default)Horn alert function OFF during Absent Present Present Absentdriving, Ignition functionNone (The transceiver cannot be Absent Absent Present Absentturned on.)HA function OFF during driving, Present Absent Absent PresentIgnition function & Timed poweroff functionTable 1 R504, R506, R742 and R743 setup chart(Refer to page 21)INSTALLATIONFig. 71793 KCT-18Accessoryconnector (9P)1 310 12Rubber capTie wrapKCT-18CutAccessoryconnector (12P)6. External Speaker (KES-4)The speaker output from the TK-790 is as follows:1. The KCH-10 has a built-in speaker (3W/8 ohms).2. The KCH-11 does not have a built-in speaker.3. The external speaker output from the accessory connec-tor (9 pins) on the back of the transceiver is 13W/4 ohms.Use the KES-4.4. The speaker output from the accessory connector (12pins) on the back of the control head is 2W/4 ohms. If theremote kit (KRK-5, KRK-6DH, KRK-7DB or KRK-8DBH) isused, use the KSP-1A or KES-4. If the KSP-1A is used, donot attempt to modify the transceiver to increase the au-dio output.Note : Since the TK-790 uses a BTL audio amplifier, do notground the speaker output pin.