The Icom IC-820H service manual provides detailed instructions for setting up, operating, and troubleshooting the VHF/UHF all-mode transceiver, including specifications, disassembly instructions, circuit descriptions, and adjustment procedures. It also includes safety warnings, such as avoiding exposure to rain or connecting to power supplies exceeding 16 V, and emphasizes careful handling during repairs to prevent damage or electric shock.
Overview
The product is the ICOM IC-820H, a VHF/UHF all-mode transceiver. The service manual provides detailed information on specifications, disassembly instructions, circuit descriptions, adjustment procedures, parts lists, mechanical parts, semiconductor information, board layouts, voltage diagrams, and block diagrams. It includes safety warnings, such as not connecting the transceiver to an AC outlet or a DC power supply exceeding 16 V, and not exposing it to liquids. The manual also outlines repair notes and ordering parts instructions.
Specifications
- Frequency coverage: 144 MHz band, 440 MHz band
- Mode: SSB (ASU), CW (A1), FM(F3)
- Number of memory channels: 116
- Antenna impedance: 50 Ω unbalanced
- Usable temperature range: -10°C to +60°C; +14°F to +140°F
- Frequency stability: ±3 ppm (-10°C to +60°C)
- Power supply requirement: 13.8 VDC ±15%
- Current drain: Transmit High 6.5 A, Receive Max audio 2.0 A, Stand-by 2.0 A
- Dimensions: 241(W) x 94(H) x 239(D) mm
- Weight: 5.0 kg; 11.0 lb
- Receive system: Single conversion superheterodyne, Double conversion superheterodyne, Triple conversion superheterodyne
- Intermediate frequencies: (Unit: MHz)
- Sensitivity (both VHF and UHF bands): FM 0.18 µV for 12 dB SINAD, SSB, CW 0.11 µV for 10 dB S/N
- Squelch sensitivity (both VHF and UHF bands): FM Threshold Less than 0.1 µV, Tight Less than 0.5 µV, SSB,CW Threshold Less than 1.0 µV, Tight Less than 3.2 µV
- Selectivity: SSB,CW More than 2.3 kHz/-6 dB, Less than 4.2 kHz/-60 dB, CW narrow More than 0.5 kHz/-6 dB, Less than 1.34 kHz/-60 dB, FM More than 15.0 kHz/-6 dB, Less than 30.0 kHz/-60 dB
- Spurious and image rejection ratio: More than 60 dB
- Audio output power: More than 2.0 W with an 8 Ω load at 10% distortion
- RIT variable range: SSB,CW ±2 kHz (max.), FM ±10 kHz (max.)
- Output power: BAND MODE HIGH LOW, FM, CW 45W BW, 144 MHz, SSB 35 W SW, FM, CW 40W 6W, 430 MHz, SSB 30 W 6W
- Spurious emissions: Less than -60 dB
- Carrier suppression: More than 40 dB
- Unwanted sideband: More than 40 dB
- Microphone impedance: 600 Ω
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
Refer to the PDF for details.
Operation
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Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Service manual (PDF – 46.6 MB)
Icom IC-820H Service Manual PDF: Troubleshoot and calibrate the IC-820H efficiently. File size: 46.6 MB.
- Brand: Icom-ic-820h-service
- Model: MANUAL
- Type: Service manual
- File size: 46.6 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)
Icom IC-820H Service Manual Overview
The Icom IC-820H is a high-performance amateur radio transceiver designed for reliable communication across various frequency bands. This service manual provides detailed technical information, schematics, and repair instructions to assist technicians and enthusiasts in maintaining and servicing the device effectively.
Main Features and Specifications
- Frequency Range: 144 MHz to 148 MHz (2-meter band)
- Modes Supported: FM, CW, SSB
- Output Power: Up to 50 Watts
- Built-in Automatic Frequency Control (AFC)
- Multiple Channel Memory Storage
- Adjustable Squelch and RF Gain Controls
- Backlit LCD Display for Frequency and Mode Information
- Robust Metal Chassis for Durability
Basic Usage and Operation Tips
To operate the Icom IC-820H, first ensure the antenna is properly connected and the power supply matches the device requirements. Use the frequency dial or keypad to select your desired frequency. Adjust the squelch control to eliminate background noise when no signal is present. When transmitting, monitor the output power and avoid overdriving the transmitter to prevent distortion. Regularly check the microphone and speaker connections for optimal audio clarity.
Troubleshooting and Maintenance Notes
Common issues include weak transmission signals, receiver noise, or display malfunctions. Refer to the service manual’s schematic diagrams for component-level troubleshooting. Regularly clean the exterior and connectors to prevent corrosion. Replace worn-out fuses and inspect internal wiring for loose connections. Calibration procedures are detailed in the manual to maintain frequency accuracy and transmitter performance.
Safety Reminder
Always disconnect the power supply before performing any maintenance or repairs. Avoid exposure to high voltages inside the unit. Use proper grounding techniques to prevent electrical shock. Follow all local regulations regarding radio transmission power and frequencies to ensure safe and legal operation.