Kenwood TK-780 Service Manual Supplement

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

25TK-780/HINSTALLATIONRedBlackYellowGreenABCA B CCOM1 No Yes YesCOM2 Yes Yes No2. Make sure the unit’s power is turned off.3. Remove the upper case of the transceiver and lift the DCcable bushing ( 1 ) from the chassis.4. Remove the pad as shown in Figure 8 ( 2 ).5. Insert the KCT-31 cable ( 3 ) into the chassis ( 4 ).The write retaining band ( 5 ) must be inside the chassis.6. Replace the DC cable bushing ( 6 ).7. Connect the KCT-31 to the TX-RX unit (A/2) as shown inFigure 9 ( 7 ).8. Replace the upper case.12AB3465CN6CN1CN2CN4CN3AB7CN6CN1CN2CN4CN3BCWhen the COM2 is used.When the COM1 is used.6-3. Installing the KCT-31 in the transceiverNote :When the COM1 is used, A connector is unused.When the COM2 is used, C connector is unused.1. Bind the unused connecor to the cable with a retainingband as shown.When the COM1 is used. When the COM2 is used.RedBlackYellowGreenABCFig. 7Fig. 8Fig. 9Note :· The modification must be applied to the TK-780/780Htransceivers with a serial number of 30200000 or smallerwhen using a COM2 port. Replace the 47kΩ (R675) chipresistor on the TX-RX unit (B/2) with a 4.7kΩ resistor.Original New47kΩ (RK73GB1J473J) → 4.7kΩ (RK73GB1J472J)· Enable the serial port function on the terminal.· Refer to the service manual of each radio or the help filethat came with the FPU (Field Programming Unit) for de-tails.