Kenwood TM G707 Service Manual

The Kenwood TM G707 is a dual-band FM transceiver operating on 144MHz and 430MHz amateur radio bands. This service manual covers technical specifications, circuit diagrams, alignment procedures, troubleshooting, and maintenance guidelines for qualified service technicians. The unit features cross-band repeating, CTCSS/DCS encode/decode, wide frequency coverage, and robust construction for amateur radio applications.

1. Technical Specifications 2. Block Diagrams 3. Circuit Descriptions 4. Alignment Procedures 5. Disassembly Instructions 6. Troubleshooting Guide 7. Parts List 8. PCB Layouts 9. Test Points 10. Service Notes 11. Warranty Information

Technical Specifications

Complete technical specifications and performance characteristics of the Kenwood TM G707 transceiver.

Parameter	Specification
Frequency Range	144-148 MHz (RX/TX), 430-450 MHz (RX/TX)
Mode	FM
Output Power	50W (VHF), 35W (UHF)
Power Supply	13.8V DC ±15%
Current Drain	RX: 0.5A (squelched), TX: 10A max
Sensitivity	0.16μV for 12dB SINAD
Selectivity	±12kHz at -6dB
Audio Output	2W at 10% distortion
Dimensions	140(W) × 40(H) × 180(D) mm
Weight	1.2 kg

Block Diagrams

System block diagrams showing signal flow and major functional blocks.

RF Section: VHF/UHF receiver and transmitter blocks
IF Section: 45.05MHz and 455kHz intermediate frequency stages
Audio Section: Audio processing and amplification circuits
Control Section: Microprocessor and control logic
Power Supply: DC-DC conversion and regulation

WARNING! High voltages present in transmitter stages. Exercise caution when servicing.

Circuit Descriptions

Detailed circuit descriptions for each major section of the transceiver.

Receiver Front End: RF amplification and first mixer circuits
IF Amplifier: Crystal filter and IF amplification stages
Detector: Quadrature detector for FM demodulation
Transmitter: VCO, driver, and final amplifier stages
Power Supply: Switching regulator and linear regulators

CAUTION! Static sensitive components. Use proper ESD protection.

Alignment Procedures

Receiver Alignment: Sensitivity, selectivity, and squelch adjustments
Transmitter Alignment: Power output, deviation, and frequency calibration
VCO Alignment: PLL lock range and modulation characteristics
CTCSS Alignment: Encode/decode frequency accuracy
Test Equipment Required: Spectrum analyzer, frequency counter, power meter, oscilloscope
Alignment Points: Trimmer capacitors, variable inductors, potentiometers
Reference Frequencies: 16.8MHz reference oscillator
Modulation Limits: ±5kHz maximum deviation

Disassembly Instructions

Step-by-step disassembly procedure for accessing internal components.

Procedure: Remove knobs, front panel, top cover, bottom cover, and circuit boards as needed.

Power off and disconnect all cables
Remove control knobs and front panel screws
Separate front panel from main chassis
Remove top and bottom cover screws
Lift main circuit board for component access

Tip: Document screw locations and cable routing during disassembly.

Troubleshooting Guide

Systematic troubleshooting procedures for common problems.

Symptom	Possible Cause	Corrective Action
No power	Power supply, fuse, regulator	Check DC input, replace fuse F1 (10A), test regulator IC
No receive	RF stages, IF circuits	Verify receiver sections, check crystal filters, test IF IC
No transmit	PA stages, VCO, PLL	Test final transistors, verify VCO operation, check PLL lock
Poor sensitivity	Front end, alignment	Align receiver front end, replace RF transistors if needed
Frequency error	Reference oscillator, PLL	Adjust reference oscillator, verify PLL programming

Reset: Factory reset procedure available in service mode.

Parts List

Complete list of replacement parts and components.

Semiconductors: Transistors, ICs, diodes with part numbers
Passive Components: Resistors, capacitors, inductors
Mechanical Parts: Knobs, connectors, hardware
PCB Assemblies: Main board, front panel, power supply
Test Equipment: Service fixtures and test cables

WARNING! Use only genuine Kenwood replacement parts.

PCB Layouts

Printed circuit board layouts and component location diagrams.

Test Points

Voltage and signal test points for performance verification.

Closed Captions: Enable in DVD setup (On/Off). Parental Controls: Block by movie/TV ratings in FEATURES menu (password 9999).

Service Notes

Important service notes and technical updates.

CAUTION! Observe proper grounding and use approved service tools.

Warranty Information

Warranty terms and service center information. This service manual is intended for qualified service technicians only. Unauthorized modifications may void warranty. For technical support, contact authorized Kenwood service centers. Copyright © Kenwood Corporation. All rights reserved.