Kenwood TS-930 Service Manual PDF

The Kenwood TS-930 is a professional HF amateur radio transceiver featuring 100W output power, general coverage receiver, built-in antenna tuner, digital frequency display, and advanced filtering capabilities. This service manual provides comprehensive technical documentation for maintenance, repair, and alignment procedures. Below are key sections covering specifications, block diagrams, alignment procedures, troubleshooting, schematics, and parts lists.

1. Technical Specifications 2. Block Diagrams 3. Alignment Procedures 4. Circuit Descriptions 5. Troubleshooting Guide 6. Schematic Diagrams 7. Parts List 8. Mechanical Assembly 9. Test Equipment Requirements 10. Safety Precautions 11. Service Notes

Technical Specifications

Complete technical specifications for the Kenwood TS-930 transceiver system.

Parameter	Specification
Frequency Range	Receive: 0.5-30 MHz, Transmit: 1.8-30 MHz (amateur bands)
Output Power	100W PEP (SSB), 80W (CW), 40W (AM)
Modes	SSB, CW, AM, FM
Sensitivity	0.25μV for 10dB S+N/N (SSB)
Selectivity	2.4kHz, 500Hz, 250Hz (SSB/CW)
Power Supply	13.8V DC ±15%, 20A max
Dimensions	140(W) × 145(H) × 350(D) mm
Weight	Approx. 10.5 kg
IF Frequencies	1st IF: 73.05 MHz, 2nd IF: 8.83 MHz, 3rd IF: 455 kHz
Antenna Impedance	50 ohms unbalanced

Block Diagrams

System block diagrams showing signal flow and major circuit sections.

Receiver Block Diagram: RF amplifier, mixer, IF stages, detector, audio output.
Transmitter Block Diagram: Microphone amp, balanced modulator, driver, PA stages.
Frequency Synthesis: PLL circuits, VCO, reference oscillator, dividers.
Power Supply: Regulator circuits, protection systems.
Control Circuits: Microprocessor, display driver, interface logic.

NOTE: Refer to schematic diagrams for detailed component-level information.

Alignment Procedures

Step-by-step alignment procedures for optimal performance.

Receiver Alignment: RF stages, IF amplifiers, BFO adjustment.
Transmitter Alignment: Carrier suppression, sideband balance, power output.
PLL Alignment: VCO tracking, lock range, reference frequency.
Filter Alignment: Crystal filter alignment for proper bandwidth.
Meter Calibration: S-meter, power meter, ALC indicators.

WARNING! Use proper test equipment and follow ESD precautions during alignment.

Circuit Descriptions

Receiver Section: Triple conversion superheterodyne with high dynamic range.
Transmitter Section: Phasing method SSB generation with Class AB power amplifier.
Frequency Synthesizer: Digital PLL system with 10Hz step resolution.
Audio Circuits: Microphone preamp, audio filters, speaker amplifier.
Control System: Microprocessor-based control with memory functions.
Power Supply: Switching regulator with overcurrent protection.
Display Circuit: Digital frequency display with LED indicators.

Troubleshooting Guide

Systematic troubleshooting procedures for common problems.

Symptom	Possible Cause	Corrective Action
No power	Power supply, fuse, wiring	Check DC input, replace fuse F1 (8A), verify wiring.
No transmit	PTT circuit, relay, PA	Check K1 relay, Q15-Q18 PA transistors, PTT switch.
Poor reception	RF amp, mixer, IF stages	Test Q1-Q3 RF stages, check mixer diodes, align IF.
Frequency error	PLL, reference oscillator	Adjust TC501 (10.24MHz), check PLL lock voltage.
Display problems	Display driver, power	Check IC16 display driver, +5V supply to display.

Reset: Power cycle unit; check for factory reset procedure if available.

Schematic Diagrams

Complete schematic diagrams for all circuit boards and subsystems.

Main Unit Schematic: Receiver, transmitter, and control circuits.
Power Supply Schematic: Regulator and protection circuits.
Display Board Schematic: Frequency counter and indicator circuits.
Filter Unit Schematic: Crystal filter networks and switching.
Control Board Schematic: Microprocessor and interface circuits.

Tip: Use high-quality prints for component identification and trace routing.

Parts List

Comprehensive parts list with component designators and specifications.

Component	Designator	Specification	Replacement Part
Power Transistor	Q15-Q18	2SC1307 or equivalent	2SC1969
RF Transistor	Q1-Q3	2SC1674	2SC2570
IC Regulator	IC4	μA723	LM723
Crystal Filter	XF1	9MHz SSB	Kenwood YG-455C
Main Fuse	F1	8A slow-blow	Same

NOTE: Use exact replacements for critical RF components.

Mechanical Assembly

Mechanical drawings and assembly instructions.

Chassis Assembly: Main frame, mounting brackets, heat sinks.
Front Panel: Controls, display, knobs, and switches.
Circuit Boards: Main board, display board, filter board locations.
Shielding: RF shielding cans and grounding points.
Cabling: Interconnect wiring and harness routing.

CAUTION! Handle circuit boards carefully to avoid damage to components.

Test Equipment Requirements

Recommended test equipment for service and alignment.

Oscilloscope: Dual trace, 50MHz minimum
RF Signal Generator: 0.1-150MHz with modulation
Frequency Counter: 10Hz resolution, 150MHz range
Power Meter: 1-200W range, 1.8-30MHz
DMM: Digital multimeter with high impedance
Dummy Load: 50 ohm, 100W minimum
Audio Generator: 20Hz-20kHz range

Safety Precautions

Important safety information for service technicians.

WARNING! High voltages present in power supply and RF sections. Disconnect power before servicing. Use isolation transformer when working on AC circuits. Follow ESD precautions with solid-state components.

Service Notes

Additional service information and common modifications.

Service Bulletin	Description	Application
TS-930-001	PA transistor upgrade procedure	All serial numbers
TS-930-002	Display brightness improvement	Early production units
TS-930-003	VCO stability modification	Units with drift issues
TS-930-004	Microprocessor reset procedure	Locked control systems

Service Support: Kenwood authorized service centers only for warranty work.