Kenwood TM-255E Service Manual

Describes the transceiver's signal path and frequency generation process.

Explains the Phase Locked Loop circuit operation and its frequency usage.

Details the PLL loop operation, frequency conversion, and signal output stages.

Details the receiver circuit, including single conversion and IF stages.

Describes receiver frontend components like FET amplifiers and filters.

Explains the Automatic Gain Control (AGC) circuit operation.

Outlines the transmitter circuit, including IF stages and frequency generation.

Explains the Automatic Level Control (ALC) circuit function.

Lists parts for the main unit TM-255A/E.

Lists items and settings for adjustment.

Lists frequencies and modes used during adjustment.

Lists menu items and their corresponding functions in adjustment mode.

Explains panel operations and key functions within adjustment mode.

Provides step-by-step instructions for entering and using adjustment mode.

Details the RIT VR mechanical center correction procedure.

Explains the IF-SHIFT VR mechanical center correction procedure.

Details the LSB carrier point adjustment.

Details the USB carrier point adjustment.

Explains S meter curve adjustment for S1 level.

Explains S meter curve adjustment for S9 level.

Explains S meter curve adjustment for full scale.

Explains S meter curve adjustment for S1 level in FM.

Explains S meter curve adjustment for full scale in FM.

Details RF meter curve adjustment for the low range.

Details RF meter curve adjustment for the middle range.

Details RF meter curve adjustment for the high range.

Explains how to set the FM microphone gain.

Explains how to set the SSB microphone gain.

Describes the procedure for writing settings into EEPROM.

Details the setting procedures for adjustment mode.

Covers PLL and CAR adjustments.

Details RX adjustment procedures.

Provides the schematic diagram of the TX-RX Unit.

Provides the schematic diagram of the TX-RX Unit.

Receiver specifications.

Transmitter specifications.