Kenwood TK 730 Service Manual

The Kenwood TK 730 is a VHF mobile transceiver designed for professional communications applications. This service manual covers technical specifications, installation procedures, maintenance guidelines, troubleshooting, and repair instructions for qualified service technicians. The radio operates in the 136-174 MHz frequency range with 45W output power and features programmable channels, CTCSS/DCS capabilities, and robust construction for demanding environments.

1. Technical Specifications 2. Installation Procedures 3. Front Panel Controls 4. Programming Instructions 5. Circuit Description 6. Alignment Procedures 7. Disassembly/Reassembly 8. Troubleshooting Guide 9. Parts List 10. Schematic Diagrams 11. Service Notes

Technical Specifications

Detailed technical specifications and performance characteristics of the Kenwood TK 730 mobile transceiver.

Parameter	Specification
Frequency Range	136-174 MHz VHF
Output Power	45W (High), 25W (Mid), 5W (Low)
Channels	Up to 128 programmable channels
Modulation	16K0F3E (FM)
Power Supply	13.8V DC ±15%
Current Drain	Receive: 0.8A (max audio), Transmit: 12A
Dimensions	140(W) × 45(H) × 190(D) mm
Weight	Approx. 1.3 kg
Temperature Range	-30°C to +60°C
Antenna Impedance	50 ohms

Installation Procedures

Proper installation guidelines for mounting and connecting the TK 730 transceiver.

Mounting: Secure the main unit in vehicle using mounting bracket, ensuring proper ventilation.
Power Connection: Connect red wire to positive terminal, black wire to negative terminal with appropriate fuse.
Antenna Installation: Install compatible VHF antenna with proper grounding and SWR adjustment.
Control Head: Mount control head in accessible location using supplied bracket.
Cable Routing: Route all cables away from heat sources and moving parts.

WARNING! Ensure proper fuse protection and antenna SWR below 2:1 before transmission.

Front Panel Controls

Description and function of all front panel controls and indicators.

Controls: POWER/VOLUME knob, Channel selector knob, MONI button, PF keys (programmable), 16-key keypad, LCD display.

Display Indicators: TX/RX, Busy, Power level, CTCSS/DCS, Scan, Lock, and programmable icon displays. PF keys can be customized for functions like scan, power level selection, tone encode/decode, and more through programming software.

Programming Instructions

Programming procedures using KPG-49D programming software and cable.

Software Installation: Install KPG-49D software on compatible Windows PC.
Radio Connection: Connect programming cable to radio's microphone jack and PC COM port.
Read/Write: Read current configuration, modify settings, write new configuration to radio.
Channel Setup: Program frequencies, CTCSS/DCS codes, power levels, and scan lists.
Function Assignment: Configure PF keys and other programmable features.

CAUTION! Always backup original configuration before making changes.

Circuit Description

Detailed circuit analysis of major sections in the TK 730 transceiver.

RF Unit: PA module, driver stage, and final amplifier circuitry.
PLL Synthesizer: Frequency generation and stability circuits.
IF Section: 21.4 MHz and 455 kHz IF stages with ceramic filters.
Audio Processing: Microphone preamp, audio power amplifier, and CTCSS/DCS circuits.
Power Supply: Voltage regulation and protection circuits.
Control Unit: Microprocessor and interface circuits.

Alignment Procedures

Step-by-step alignment procedures using proper test equipment.

Alignment	Procedure	Test Points
PLL Adjustment	Adjust VC1 for zero beat at specified frequencies	TP1, TP2
Transmit Power	Adjust VR5 for 45W output at high power setting	RF output
Modulation Balance	Adjust VR3 for proper deviation	MOD IN
Receiver Sensitivity	Adjust L3, L4 for 0.22μV at 12dB SINAD	RF generator
Squelch Threshold	Adjust VR4 for proper squelch operation	Squelch control

Disassembly/Reassembly

Proper disassembly and reassembly procedures for service access.

Remove control head: Disconnect cable and remove mounting screws.
Remove top cover: Remove screws from top and sides of main unit.
Access internal boards: Remove shield covers and board mounting screws.
Component replacement: Follow ESD precautions when handling PCBs.
Reassembly: Reverse disassembly procedure, ensuring all connectors are secure.

WARNING! Disconnect power and antenna before disassembly. Use ESD protection.

Troubleshooting Guide

Common problems and solutions for the TK 730 transceiver.

Symptom	Possible Cause	Corrective Action
No power	Blown fuse, power cable	Check fuse F1 (15A), verify power connections
No transmit	PA unit, PLL unlock	Check PA voltage, verify PLL lock at TP2
Poor reception	RF front end, antenna	Check antenna SWR, test RF amplifier Q1
Display issues	Ribbon cable, LCD	Check control head cable, replace LCD if damaged
Audio problems	Speaker, audio IC	Test speaker continuity, check IC2 audio output

Parts List

Replacement parts and components for service and repair.

Main Unit: X51-3530-XX (main board), X51-3540-XX (RF board)
Power Amplifier: X10-1480-XX (PA module)
Control Head: X51-3550-XX (front panel assembly)
LCD Display: X06-1630-XX (LCD module)
Common ICs: IC1 (CPU), IC2 (Audio), IC3 (PLL)
Fuses: F1 (15A), F2 (5A)

Schematic Diagrams

Reference to included schematic diagrams for circuit analysis.

Complete schematic diagrams are provided in separate sections covering:

Main board schematic (power supply, control circuits)
RF board schematic (transmit/receive circuits)
Control head schematic (display and keypad circuits)
PLL synthesizer schematic (frequency generation)
Audio processing schematic (microphone and speaker circuits)

Note: Refer to diagram numbers X51-3530-10 through X51-3530-50 for complete schematics.

Service Notes

Important service notes and technical bulletins.

Firmware Updates: Check for latest firmware version using programming software. Component Changes: Some components may have been updated during production - verify part numbers before replacement. Calibration: After major component replacement, full alignment may be required. Safety: Always use specified replacement parts and follow proper safety procedures.

Service Support: Contact Kenwood authorized service centers for technical support and genuine replacement parts.