The Kenwood TH-79 A/E service manual provides detailed instructions for disassembly, repair, and adjustment of the radio, including circuit descriptions and wiring diagrams for troubleshooting. It covers the setup and operation of the dual-band radio, explaining the frequency configurations and signal channels for both VHF and UHF bands.
Manual Overview
The Kenwood TH-79 A/E service manual provides detailed instructions for technicians on disassembly, circuit descriptions, and adjustments necessary for maintaining and repairing the 144/430(440)MHz FM dual bander. The manual includes a comprehensive troubleshooting flow, focusing on the removal and separation of the main unit into parts A and B, and further disassembly of the shield cover, B unit, and LCD assembly. Circuit descriptions detail the frequency configuration, highlighting independent PLL circuits for VHF and UHF bands, and the double super heterodyne method for receiving signals. The manual also covers the transmission signal channel, detailing the pathway from microphone input to antenna output. Calibration and adjustments are guided by specifications for various components, such as the MCF and ceramic filters, ensuring optimal performance. Board-level guidance is provided through wiring diagrams and PC board views, assisting in precise repairs and adjustments. The manual does not include specific error codes or diagnostics but emphasizes the importance of understanding circuit functions and signal pathways for effective troubleshooting.
Quick Issues Covered
- Diagnose power-up failures with detailed disassembly instructions.
- Calibrate frequency using PLL circuit adjustments.
- Trace circuits using comprehensive schematic diagrams.
Overview
The product is a 144/430(440)MHz FM dual band transceiver, model TH-79 A/E by Kenwood. The service manual covers various technical aspects including disassembly for repair, circuit descriptions, component descriptions, semiconductor data, parts list, exploded view, packing, adjustment, terminal functions, wiring diagram, PC board views, schematic diagram, block diagram, and specifications.
Specifications
- TH-79 A/E
- 144/430(440)MHz FM DUAL BANDER
- Kenwood
- Service Manual
- Specifications on back cover
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
Refer to the PDF for details.
Operation
Refer to the PDF for details.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Service manual (PDF – 3.2 MB)
Kenwood TH-79A/E Service Manual PDF (3.2 MB): Guides technicians in troubleshooting, calibrating, and repairing the TH-79A/E model.
- Brand: Kenwood-th-79-a-e-service
- Model: MANUAL
- Type: Service manual
- File size: 3.2 MB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Download MANUAL service manual (PDF)
Kenwood TH-79-A-E Service Manual Overview
The Kenwood TH-79-A-E is a professional-grade handheld transceiver designed for reliable two-way communication in various environments. Widely used by amateur radio enthusiasts and professionals alike, this device offers clear audio transmission and robust performance. The service manual provides detailed instructions for maintenance, repair, and optimal operation of the Kenwood TH-79-A-E, ensuring longevity and peak functionality.
Main Features and Specifications
- Frequency Range: VHF 144-148 MHz
- Power Output: Up to 5 Watts
- Channel Capacity: 128 channels with memory storage
- Display: Backlit LCD for easy readability in low light
- Battery: Rechargeable NiMH battery pack with extended life
- Modulation: FM with high audio clarity
- Durability: Rugged design suitable for outdoor use
- Additional Features: CTCSS/DCS tone signaling, VOX operation, and emergency alert function
Basic Usage and Operation Tips
To operate the Kenwood TH-79-A-E, first ensure the battery is fully charged. Turn on the device using the power knob and select the desired channel using the channel selector. Adjust the volume to a comfortable level. For transmitting, press and hold the push-to-talk (PTT) button and speak clearly into the microphone. Release the PTT button to listen. Utilize the scan function to monitor multiple channels efficiently. Refer to the manual for programming custom channels and setting up tone squelch features.
Troubleshooting and Maintenance Notes
If you experience weak transmission or reception, verify antenna connection and battery status. Intermittent audio may indicate a need for internal cleaning or component inspection as outlined in the service manual. Regularly clean the exterior and connectors with a soft cloth to prevent dust buildup. Replace the battery pack when operating time diminishes significantly. For complex repairs, follow the step-by-step service procedures to avoid damaging sensitive components.
Safety Reminder
Always operate the Kenwood TH-79-A-E in accordance with local regulations and avoid transmitting in restricted frequency bands. Do not expose the device to extreme temperatures or moisture. When servicing, disconnect the battery to prevent electrical shock. Use only authorized replacement parts to maintain device safety and performance.