Kenwood TS 570 Service Manual

The Kenwood TS 570 is a high-performance amateur radio transceiver featuring 100W output power, all-mode operation (SSB, CW, AM, FM, RTTY), built-in antenna tuner, DSP filtering, and comprehensive receiver/transmitter capabilities. This service manual covers technical specifications, circuit descriptions, alignment procedures, troubleshooting, and maintenance guidelines for qualified service technicians.

1. Technical Specifications 2. Block Diagram Overview 3. Circuit Descriptions 4. Alignment Procedures 5. Test Points & Measurements 6. Troubleshooting Guide 7. Parts List & Replacement 8. PCB Layouts 9. Wiring Diagrams 10. Safety Precautions 11. Firmware Information

Technical Specifications

Complete technical specifications for the Kenwood TS 570 transceiver system.

Parameter	Specification
Frequency Coverage	Receive: 0.1-30 MHz; Transmit: 1.8-30 MHz (amateur bands)
Output Power	100W PEP (SSB), 100W (CW), 40W (AM), 25W (FM)
Modes	LSB, USB, CW, AM, FM, RTTY
Sensitivity	0.25 μV for 10 dB S/N (SSB, CW)
Selectivity	DSP filters: 2.4/1.8/0.5 kHz (SSB), 500/250 Hz (CW)
Power Supply	13.8V DC ±15%, 22A max
Dimensions	280(W) × 105(H) × 310(D) mm
Weight	Approx. 6.5 kg
Antenna Impedance	50 ohms unbalanced
Built-in Tuner	AT-570 automatic antenna tuner (optional)

Block Diagram Overview

System block diagram showing major functional sections and signal flow.

RF Front End: Preselector, RF amplifier, first mixer
IF System: Multiple IF stages with crystal filters
DSP Section: Digital signal processing for filtering and demodulation
Transmitter Chain: Microphone amp, modulator, driver, final amplifier
Power Supply: DC-DC converters and voltage regulators
Control System: Microprocessor and interface circuits

WARNING! High voltages present in final amplifier section. Exercise extreme caution when servicing.

Circuit Descriptions

Detailed circuit analysis of major subsystems.

Receiver Circuit: RF input through audio output stages
Transmitter Circuit: Microphone input to RF output
PLL Synthesizer: Frequency generation and control
DSP Board: Digital signal processing implementation
Power Amplifier: Final RF amplification and protection
Control Interface: Front panel and remote control

CAUTION! Static-sensitive components present. Use proper ESD precautions.

Alignment Procedures

PLL Alignment: Reference oscillator and VCO adjustments
Receiver Alignment: RF and IF stage gain optimization
Transmitter Alignment: Carrier suppression, power output calibration
Filter Alignment: Crystal filter center frequency adjustment
DSP Calibration: Filter characteristics and AGC timing
Meter Calibration: S-meter and power meter accuracy
Antenna Tuner: Matching network calibration (if equipped)

Test Points & Measurements

Critical test points and expected voltage/waveform measurements.

Test Equipment Required: Oscilloscope, RF power meter, frequency counter, multimeter, dummy load, signal generator.

Key Test Points: TP1 (PLL lock detect), TP2 (IF output), TP3 (AGC voltage), TP4 (Transmit drive), TP5 (Final collector current). Voltage Measurements: +8V, +5V, +13.8V, -8V rails. RF Measurements: Transmit power, receiver sensitivity, spurious emissions.

Troubleshooting Guide

Systematic troubleshooting procedures for common problems.

Verify power supply voltages before beginning diagnosis
Check fuses F1 (8A) and F2 (3A) for power issues
Use service mode for error code interpretation
Follow signal flow from input to output for no-receive/no-transmit
Check microprocessor reset circuit for control issues

Tip: Always start with simplest solutions - check cables, connectors, and power first.

Parts List & Replacement

Comprehensive parts list with manufacturer part numbers and substitutes.

Symptom	Possible Cause	Corrective Action
No power	Blown fuse, power supply failure	Replace F1/F2; check DC input circuit; verify Q101-Q104
No transmit	PA failure, relay issue	Check final transistors (2SC2879); verify TR relay; test driver stages
Poor receiver sensitivity	RF amp failure, filter issues	Test Q1-Q3; verify crystal filters FL1-FL3; check AGC voltage
Frequency instability	PLL unlock, reference oscillator	Check TCXO (X1); verify VCO circuits; test lock detect voltage
Display problems	LCD failure, controller issue	Check LCD connections; verify +5V supply; test microprocessor

Reset: Power cycle; factory reset procedure available in service mode.

PCB Layouts

Detailed printed circuit board layouts for main unit and optional modules.

Wiring Diagrams

Complete interconnecting wiring diagrams and cable harness details.

CAUTION! Disconnect power before performing continuity tests or harness inspections.

Safety Precautions

High voltage present in power supply and RF final sections. Use isolation transformer when servicing AC-powered accessories. RF radiation hazard during transmitter testing - use dummy load.

Firmware Information

Current firmware versions: Main CPU V1.20, DSP V1.15. Update procedures and version history. Service mode access: Hold [F] and [A/B] while powering on.

Service Contacts: Authorized Kenwood service centers only. Technical support available through Kenwood dealer network.