Kenwood TS-450S Service Manual

General description of the TS-450S/690S HF transceivers, highlighting their capabilities.

Details unit configurations for different models and destinations, including key features.

Lists destination codes, associated frequency bands, and optional accessories.

Explains the frequency configuration methods and considerations for the transceiver.

Details the frequency configuration process and signal flow within the transceiver.

Diagram illustrating the frequency configuration of the Phase-Locked Loop (PLL) circuit.

Explains the components and their roles in the PLL circuit configuration.

Describes the reference oscillator circuit and presents the PLL circuit block diagram.

Details the operation of the LO2 and LO3 loops within the PLL circuit.

Presents PLL data and frequency information in a table format.

Explains the CAR Unit and the function of the cancel loop circuit.

Illustrates the block diagram and data format for the DDS IC (YM6631).

Provides an overview of the receiver circuit configuration and its front-end.

Presents the overall block diagram of the receiver system.

Circuit diagrams for the RF Unit and IF Unit.

Details the operation of the NB1 and NB2 noise blanker circuits.

Explains the functionality of the squelch circuit in different modes.

Describes the Select circuit and the Notch circuit for signal filtering.

Details the AGC, signal-strength meter, and dB meter circuits.

Explains IF filter selection, initial conditions, and optional filter types.

Overview of the transmitter circuit configuration and its main blocks.

Illustrates the overall block diagram of the transmitter.

Describes the ALC circuit and its power control mechanism.

Details power control, VSWR protection, and temperature protection circuits.

Explains the ALC meter circuit and its specific adjustment procedures.

Explanation of timing for standby control operations.

Details on TXB keying timing and RBC signal generation.

Illustrates timing signals for CKY, PLL, DDS, and transmit/receive.

Circuit diagrams for TRX, BK-IN, DELAY, and METER units.

Diagram illustrating the standby timing circuit.

Explains timing details for full break-in operation.

Details on TXB and CKY signal generation timing.

Illustrates CKY generation timing diagrams.

Details timing for semi-break-in and VOX operations.

Explanation of TXB and CKY signal generation.

Description of the 50MHz 50W Final Unit.

Describes the AT Unit and its auto antenna tuner functionality.

Presents the block diagram for the auto antenna tuner.

Details the operation of the auto tuning mode.

Instructions for manual and preset antenna tuning procedures.

Table specifying settings for antenna tuning operations.

Overview of the digital control unit, CPU, and memory.

Illustrates the block diagram of the digital control unit.

Explains address control and the memory map structure.

Details on Reset, Display, and RL/DDS control circuits.

Illustrates circuits for Reset and Encoder functions.

Explains control signals for the IF unit.

Diagrams for IF and RF unit serial-to-parallel converters.

Details control signals for the AT unit.

Circuit diagrams for AT-450 and AT-300 control.

Explains serial interface, key scan, and beep functions.

Circuit and matrix diagrams for interface and key functions.

Details the EEPROM circuit and its diagram.

Explains the analog input circuit and its diagram.

Presents band data for various frequency ranges.

Details the function of pins for specific ICs.

Details the extended I/O functions for IC7.

Illustrates the system diagram related to IC7.

Explains the various option setting modes and menus.

Details Extended Function 1, including menu selection and termination.

Explains settings for memory protect erase and write inhibit.

Presents the settings table for Extended Function 1.

Details Extended Function 2 and its menu operations.

Introduces the adjustment function and its menu.

Explains menu selection and termination for adjustments.

Details the CW pitch settings and frequency adjustments.

Provides a comprehensive table of adjustment menu items and procedures.

Describes the TC9174F interface, including pin functions and diagrams.

Details the SN74LS145NS, including its truth table and block diagram.

Describes TC4066BF analog switch and TC74HC573AF address latch.

Provides terminal connection and block diagram for the CPU.

Details the TC74HC138AF address decoder, including its truth table.

Describes LZ9213GJ encoder gate array and M51951BML system reset IC.

Details µPD74HC390G frequency divider and SN74S74NS D-FF.

Provides terminal descriptions and block diagram for the PLL CXD1225M.

Lists components specifically for the RF Unit.

Lists components for various Final Units.

Lists components for the Digital Unit and IF Unit.

Continues the list of components for the IF Unit.

Lists components for PLL, CAR, and Filter Units.

Lists components for VCO2, Side Tone, VOX, FM MIC AMP, Notch, NB2 units.

Lists parts for the main TS-450S/690S unit.

Lists components for the RF Unit.

Lists components for the Switch Unit.

Continues the parts list for the RF Unit.

Continues the parts list for the RF Unit.

Further continuation of the parts list for the RF Unit.

Extensive parts list for the RF Unit.

Detailed parts list for the RF Unit.

Lists components for the HF 100W Final Unit.

Lists components for the 50MHz 10W Final Unit.

Lists components for the 50MHz 50W Final Unit.

Lists components for the Digital Unit.

Continues the parts list for the Digital Unit.

Lists components for the IF Unit.

Continues the parts list for the IF Unit.

Lists components for the PLL Unit.

Continues the parts list for the PLL Unit.

Lists components for the CAR Unit.

Shows an exploded view of the main unit assembly (Section A).

Exploded views of Filter Unit, Final Unit, and Rear Panel.

Exploded view of the Sub Panel assembly.

Exploded views of Chassis Assembly and RF module.

Exploded views of LCD Assembly and Switch Unit.

Lists the test equipment necessary for adjustments.

Table showing preferred settings for various parameters.

Guide to entering and operating the adjustment mode.

Details on using the expansion menu mode for adjustments.

Illustrates front and rear panel layouts for TS-450S and TS-690S.

Procedure for initializing settings and checking the display.

Adjustment procedures for the PLL and CAR units.

Details the adjustment procedures for the receiver section.

Adjustments for S-meter, beep tone, notch, and noise blanker.

Adjustments for RF attenuation and RF gain.

Adjustments for AGC, voice, and signal-to-noise ratio.

Details squelch adjustments for SSB and FM modes.

Procedures for adjusting various transmitter circuits.

Procedures for EEPROM writing and power down adjustment.

Adjustments for SWR protection, FM deviation, and processor.

Adjustments for microphone sensitivity and tone side level.

Diagram indicating upper adjustment points on the units.

Diagram indicating lower adjustment points on the units.

Details terminal functions for the Switch Unit.

Details terminal functions for the RF Unit.

Details terminal functions for Final Units.

Details terminal functions for the Digital Unit.

Details terminal functions for the PLL Unit.

Details terminal functions for CAR and Filter Units.

Details terminal functions for the AT Unit.

Shows component and foil side views of the AT Unit PC board.

Circuit diagram and PC board views for the RF Unit.

Circuit diagram for the IF Unit of the TS-690S.

Component and foil side views of the Digital Unit PC board.

Circuit diagram for the Digital Unit of the TS-450S.

Component side view of the Side Tone Unit.

Component side view of the VOX Unit.

Component side view of the TRX Unit.

Component side view of the METER Unit.

Component and foil side views of the IF Unit PC board.

Circuit diagram for the IF Unit of the TS-450S.

Component and foil side views of the PLL Unit PC board.

Circuit diagram for the PLL Unit of the TS-450S.

Component and foil side views of the VCO2 Unit PC board.

Circuit diagram for the CAR Unit.

Component and foil side views of the Filter Unit PC board.

Circuit diagram for the Filter Unit of the TS-690S.

Component and foil side views of the AT Unit PC board.

Circuit diagram for the AT Unit.

Component side view of the Switch Unit.

Component and PC board views of the LCD Assy.

Detailed schematic diagram for the TS-450S.

Detailed schematic diagram for the TS-690S.

Block diagram illustrating the RF Unit.

Block diagram illustrating the IF Unit.

Block diagram illustrating the PLL Unit.

Block diagram illustrating the CAR Unit.

Level diagram illustrating the RX section signal flow.

Level diagram illustrating the TX section signal flow.

Shows external views of the PS-33 and PS-53 DC power supplies.

Guides for adjusting voltage and overcurrent protection.

Illustrates the packing procedure for the PS-33/53.

Lists components for the PS-33/53 DC power supply.

Shows the external view of the SO-2 TCXO Unit.

Details frequency, stability, and output specifications for the SO-2.

Provides specifications for the SP-23 external speaker.

Presents the schematic diagram for the VS-2 voice synthesizer.

Specifies parameters for SSB crystal filters.

Specifies parameters for CW crystal filters.

Shows the external view of the TU-8 Tone Unit.

Details frequency range, deviation, and power specifications.

Explains the circuit design of the TU-8 Tone Unit.

Covers tone-burst and continuous tone mode adjustments.

Includes program settings and timing diagrams for TU-8.

Lists components for the TU-8 Tone Unit.

Shows the PC board layout for the TU-8 Tone Unit.

Presents the schematic diagram for the TU-8 Tone Unit.

Detailed specifications for the TS-450S model, covering general, transmitter, and receiver parameters.

Specifics on TS-450S receiver sensitivity, selectivity, and other performance metrics.

Detailed specifications for the TS-690S model, covering general, transmitter, and receiver parameters.

Specifics on TS-690S receiver sensitivity, selectivity, and other performance metrics.