Kenwood TK-790 Service Manual

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

2TK-790/(B)/H(B)CONTENTS / GENERALGENERAL ......................................................................................................................... 2SYSTEM SET-UP ............................................................................................................. 4OPERATING FEATURES ................................................................................................. 5INSTALLATION .............................................................................................................. 16DISASSEMBLY FOR REPAIR ......................................................................................... 22CIRCUIT DESCRIPTION ................................................................................................. 26SEMICONDUCTOR DATA ............................................................................................. 32DESCRIPTION OF COMPONENTS ............................................................................... 36PARTS LIST .................................................................................................................... 39EXPLODED VIEW .......................................................................................................... 57PACKING ........................................................................................................................ 61ADJUSTMENT ............................................................................................................... 65TERMINAL FUNCTION ................................................................................................. 74WIRING .......................................................................................................................... 77PC BOARD VIEWS / CIRCUIT DIAGRAMSDISPLAY UNIT (X54-3190-20) : KCH-10 .................................................................. 79DISPLAY UNIT (X54-3200-20) : KCH-11 .................................................................. 81CONTROL UNIT (X57-5610-XX) (B/3) ..................................................................... 87FINAL UNIT (X57-5610-XX) (C/3) : TK-790/(B) ....................................................... 97TX-RX UNIT (X57-5610-XX) (A/3) ......................................................................... 101FINAL UNIT (X45-3560-10) : TK-790H(B) .............................................................. 113BLOCK DIAGRAM ........................................................................................................ 117SPECIFICATIONS ......................................................................................................... 119GENERALINTRODUCTIONSCOPE OF THIS MANUALThis manual is intended for use by experienced techni-cians familiar with similar types of commercial grade com-munications equipment. It contains all required service in-formation for the equipment and is current as of this publica-tion date. Changes which may occur after publication arecovered by either Service Bulletins or Manual Revisions,which are issued as required.ORDERING REPLACEMENT PARTSWhen ordering replacement parts or equipment informa-tion, the full part identification number should be included.This applies to all parts : components, kits, and chassis. Ifthe part number is not known, include the chassis or kitnumber of which it is a part and a sufficient description ofthe required component, for proper identification.PERSONNEL SAFETYThe following precautions are recommended for person-nel safety :• DO NOT transmit if someone is within two feet (0.6meter) of the antenna.• DO NOT transmit until all RF connectors are secure andany open connectors are properly terminated.• SHUT OFF this equipment when near electrical blastingcaps or while in an explosive atmosphere.• All equipment should be properly grounded beforepower-up for safe operation.• This equipment should be serviced by only qualified tech-nicians.