The service manual for the IC-746PRO HF/VHF Transceiver provides detailed information on specifications, disassembly, circuit descriptions, and adjustment procedures necessary for setup and operation. It also includes troubleshooting guidelines, such as ensuring the transceiver is disconnected from power before servicing and using insulated tools for adjustments to prevent damage.
Overview
The IC-746PRO is an HF/VHF transceiver. The service manual provides detailed service information for this model, including specifications, disassembly instructions, circuit descriptions, adjustment procedures, parts lists, and various diagrams. The manual also includes safety warnings and repair notes to ensure proper handling and maintenance of the transceiver.
Specifications
- + Frequency coverage: Receive 0.030—60.000 MHz, 108.000-174.000 MHz; Transmit 1.800-1.999 MHz, 3.500-3.999 MHz, 7.000—7.300 MHz, 10.100-10.150 MHz, 14.000—14.350 MHz, 18.068-18.168 MHz, 21.000—21.450 MHz, 24.890-24.990 MHz, 28.000—29.700 MHz, 50.000-54.000 MHz, 144.000-148.000 MHz
- + Mode: USB, LSB, CW, RTTY
- + Number of memory channels: 101 (99 regular, 1 call, 2 scan edges)
- + Antenna connector: SO-239 x 3 (2 for HF/50 MHz bands and 1 for 144 MHz band; 50 Q)
- + Usable temp. range: -10°C to +60°C (14°F to 140°F)
- + Frequency stability: Less than +7 ppm from 1 min. to 60 min. after power ON; Temperature fluctuations (0°C to +50°C; 32°F to 122°F) less than +5 ppm
- + Power supply requirement: 13.8 V DC +15 % (negative ground)
- + Current consumption: Transmit max.power 23.0A; Receive stand-by 22A; max. audio 3.0A
- + Dimensions: 287(W) x 120(H) x 316.5(D) mm
- + Weight: 9.0 kg (19 Ib 13 oz)
- + ACC 1 connector: 8-pin DIN connector
- + ACC 2 connector: 7-pin DIN connector
- + REMOTE connector: 2-conductor 3.5(d) mm
- + Output power: SSB/CW/RTTY/FM 5-100 W; AM 5-40 W
- + Modulation system: SSB PSN modulation; AM Low power modulation; FM Phase modulation
- + Spurious emission: Less than -50 dB (HF bands); Less than —60 dB (50/144 MHz bands)
- + Carrier suppression: More than 40 dB
- + Unwanted sideband suppression: More than 55 dB
- + ATX variable range: 49.99 kHz
- + Mic. connector: 8-pin connector (600 Q)
- + ELE-KEY connector: 3-conductor 6.35(d) mm
- + KEY connector: 8-conductor 6.35(d) mm
- + SEND connector: Phono (RCA)
- + ALC connector: Phono (RCA)
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
The source provides some setup highlights for the IC-746PRO HF/VHF Transceiver. It emphasizes the importance of disconnecting the DC power cable before performing any work on the transceiver to avoid electric shock or equipment damage. To access the internal units for installation or adjustment, the carrying handle and several screws from the top, sides, and bottom of the transceiver need to be removed to lift the covers. There are no specific details on wiring, clearances, or calibration in the provided source.
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 – 14.3 MB)
Icom IC-746PRO Service Manual PDF: 14.3 MB. Assists technicians in troubleshooting, calibrating, and repairing the IC-746PRO radio model.
- Brand: Icom-ic-746pro-service
- Model: MANUAL
- Type: Service manual
- File size: 14.3 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-746PRO Service Manual Overview
The Icom IC-746PRO is a versatile HF/VHF/UHF transceiver designed for amateur radio enthusiasts and professionals alike. This device supports a wide frequency range and offers advanced communication capabilities, making it ideal for both casual and serious radio operators. The service manual provides detailed instructions for maintenance, repair, and troubleshooting to ensure optimal performance and longevity of the transceiver.
Main Features and Specifications
- Frequency Coverage: HF (1.8–30 MHz), VHF (50 MHz), and UHF (144 MHz)
- Output Power: Up to 100 watts on HF and VHF bands
- Multiple Operating Modes: SSB, CW, AM, FM, and RTTY
- Built-in Digital Signal Processing (DSP) for enhanced audio quality
- Large multi-function LCD display with adjustable backlight
- Memory channels for quick frequency recall
- Advanced noise reduction and automatic notch filter features
Basic Usage and Operation Tips
To operate the IC-746PRO, first ensure the antenna is properly connected and tuned for the desired frequency band. Power on the unit and select the operating mode suitable for your communication needs. Use the tuning dial to adjust frequency, and utilize memory channels for quick access to favorite frequencies. Adjust the volume and squelch controls to optimize audio clarity. Regularly update the firmware if applicable to maintain device functionality and access new features.
Troubleshooting and Maintenance Notes
If you experience issues such as distorted audio, loss of signal, or power failures, consult the troubleshooting section of the manual for step-by-step diagnostics. Common maintenance tasks include cleaning connectors, inspecting antenna cables, and checking for firmware updates. Avoid exposing the transceiver to extreme temperatures or moisture to prevent internal damage. For complex repairs, refer to the detailed circuit diagrams and parts list provided in the service manual.
Safety Reminder
Always disconnect the power supply before performing any maintenance or repairs to avoid electrical shock. Use only recommended accessories and antennas to prevent damage to the transceiver. Operate the device in a well-ventilated area to avoid overheating, and adhere to local regulations regarding radio frequency transmissions to ensure safe and legal operation.