Introduction
This service manual provides detailed information for the Icom IC-970, IC-970M, and IC-970D, which are VHF/UHF multi-band, all-mode transceivers. It covers essential aspects for maintenance and repair, including specifications, disassembly procedures, parts lists, adjustment methods, circuit diagrams, and block diagrams. For any unclear points or issues encountered during repair or adjustment, please contact Icom service centers.
Key Features and Specifications
- Frequency Range: 144-146 MHz, 430-440 MHz, 1260-1300 MHz (with UX-97 installed)
- Modes: SSB (USB/LSB), CW, FM
- Power Requirements: DC 13.8V ±15% (DC power type) or AC 100V ±10% (AC built-in type)
- Antenna Impedance: 50Ω unbalanced
- Operating Temperature: -10°C to +60°C
- Frequency Stability: Within ±3ppm (0°C to +50°C)
- Receiver Sensitivity: Detailed specifications for SSB/CW and FM modes across different bands are provided.
- Selectivity: Specifications for SSB/CW and FM selectivity are listed.
Manual Structure
The manual is organized into the following sections:
- 1. Specifications: General and detailed electrical and mechanical specifications.
- 2. Exploded Views: Detailed diagrams of the chassis, front panel, SW units, rear panel, and accessories.
- 3. Parts List: Comprehensive list of all components with order numbers.
- 4. Adjustment Methods: Step-by-step guides for tuning and calibration, including PLL adjustments and RF/receiver adjustments.
- 5. Component Layout Diagrams: Visual guides showing the placement of components on various internal units.
- 6. Circuit Diagrams and Voltage Distribution: Schematics and voltage readings for troubleshooting.
- 7. Block Diagram: An overview of the transceiver's internal architecture.
