The Icom maintenance manual for the IC-5571 and IC-551D transceivers covers setup and operation through detailed descriptions of operating controls, circuit descriptions, and options installation. It also provides troubleshooting guidance with sections on maintenance, adjustment, and a voltage chart to assist in diagnosing and resolving issues.
Manual Overview
The Icom IC-5571/IC-551D maintenance manual provides detailed guidance for servicing the transceiver, focusing on troubleshooting, diagnostics, calibration, and adjustments. The troubleshooting section outlines a systematic approach to diagnosing issues, including a flowchart for identifying faults and resolving common problems. Error codes and diagnostic procedures are provided to assist technicians in pinpointing specific issues within the device’s circuitry. Calibration and adjustments are covered extensively, with instructions for PLL, receiver, and transmitter adjustments to ensure optimal performance. The manual includes board-level guidance, detailing the layout and schematic diagrams of the PC boards, which are essential for in-depth repairs and understanding the device’s electronic architecture. Additionally, the manual specifies the necessary measuring instruments for adjustments, ensuring technicians are equipped with the correct tools. Overall, the manual serves as a comprehensive resource for maintaining and repairing the Icom transceiver, with a focus on technical accuracy and detailed procedural information.
Quick Issues Covered
- Diagnose PLL unit issues with detailed adjustment procedures.
- Troubleshoot power-up failures with comprehensive error code listings.
- Utilize schematic diagrams for effective circuit tracing and repairs.
Overview
The document is a maintenance manual for the ICOM IC-5571 and IC-551D all-mode transceiver. It includes detailed sections on specifications, operating controls, circuit descriptions, block diagrams, options installation, disassembly, maintenance and adjustment, voltage charts, troubleshooting, IC specifications, and parts lists. The manual provides comprehensive technical information necessary for the maintenance and operation of the transceiver.
Specifications
- Number of Semi-Conductors
- Transistors 56 [74]
- FET 13 [17]
- IC (includes CPU) 30 [44]
- Diodes 114 [162]
- Frequency Coverage
- 50 ~ 54MHz
- Operationable Temperature
- —10°C ~ +60°C (14°F ~ 140°F)
- Frequency Stability
- Less than +500Hz after switch on 1 min to 60 min, less than 100Hz per 1 hour after 60 min, and less than +1KHz in the range of —10°C to +60°C
- Antenna Impedance
- 50 ohms unbalanced
- Power Supply Requirements
- 13.8V DC +15%, negative ground, or 117V/240V AC +10%
- Current drain
- 18A max. (at 200W input)
- Power Consumption
- Receive at min. audio level 0.5A
- (at 13.8V DC) at max. audio level 0.7A
- Transmit in SSB/CW modes 3.3A [15A]
- in AM mode 3.0A [8A]
- in FM mode 3.3A [15A]
- Dimensions
- 1114mm(H) x 241mm(W) x 3114mm(D)
- Weight
- 6.1kg [6.6kg]
- TRANSMITTER
- Emission Modes
- A3J SSB (USB/LSB)
- A1 CW
- A3H AM
- F3 FM
- RF Output Power
- SSB 10WPEP (1~10W adjustable) [SOW PEP (1 ~80W adjustable)]
- CW 10W (1 ~ 10W adjustable) [SOW (1 ~ 80W adjustable)]
- AM 4W (0 ~ 4W adjustable) {40W (0 ~ 40W adjustable)]
- FM 10W (1 ~ 10W adjustable) {SOW (1 ~ 80W adjustable)]
- Modulation System
- SSB/AM Balanced modulation
- FM Variable reactance frequency modulation
- Max. Frequency Deviation
- +5KHz
- Spurious Emission
- More than 60dB below peak power output
- SSB Carrier Suppression
- More than 40dB below peak power output
- SSB/AM Unwanted Sideband
- More than 40dB down at 1000Hz AF input
- Microphone
- 600 ohm dynamic or electret condenser microphone
- RECEIVER
- Receiving Mode
- A1 (CW), A3J (USB, LSB), A3H (AM), F3 (FM)
- Receiving System
- SSB/CW/AM Single Superheterodyne (Triple Superheterodyne when Pass Band Tuning unit is installed or IC-551D)
- FM Double Superheterodyne
- Intermediate Frequency
- SSB/CW/AM 9.0115MHz
- (When Pass Band Tuning Unit is installed, or IC-551D: 2nd IF: 10.75MHz, 3rd IF: 9.0115MHz)
- FM 1st IF: 9.0175MHz, 2nd IF: 455KHz
- Sensitivity
- SSB/CW/AM Less than 0.5uV for 10dB S+N/N
- FM* More than 30dB S+N
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
“”
Download MANUAL Service manual (PDF – 5.1 MB)
Icom IC-551/IC-551D Service Manual PDF: Troubleshoot and repair radio systems efficiently. File size: 5.1 MB.
- Brand: Icom-ic-551-ic-551d-service
- Model: MANUAL
- Type: Service manual
- File size: 5.1 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-551 / IC-551D Service Manual Overview
The Icom IC-551 and IC-551D are compact, high-performance handheld transceivers designed for amateur radio enthusiasts and professional communication users. These devices operate in the VHF frequency range, providing reliable two-way communication with clear audio quality and robust signal reception. The service manual offers detailed technical guidance for maintenance, repair, and troubleshooting, ensuring optimal device performance and longevity.
Main Features and Specifications
- Frequency Range: 144–148 MHz (VHF band)
- Output Power: Up to 5 Watts
- Modulation: FM (Frequency Modulation)
- Channel Capacity: 200 memory channels
- Battery Type: Rechargeable Ni-Cd or Ni-MH battery pack
- Display: LCD with backlight for easy readability
- Built-in CTCSS and DCS for selective calling
- Compact and lightweight design for portability
- Emergency alert function
Basic Usage and Operation Tips
To operate the IC-551/IC-551D, power on the device and select the desired frequency or memory channel using the keypad or rotary dial. Adjust the volume and squelch controls for clear audio reception. Use the push-to-talk (PTT) button to transmit your voice. Regularly charge the battery to maintain optimal performance and avoid unexpected power loss during use. Familiarize yourself with the emergency alert feature for quick access in urgent situations.
Troubleshooting and Maintenance
If you experience weak transmission or reception, check the antenna connection and ensure the battery is fully charged. Refer to the service manual for detailed circuit diagrams and component locations to assist with repairs. Clean the exterior and keypad regularly to prevent dirt buildup. Avoid exposing the device to extreme temperatures or moisture, which can damage internal components. For persistent issues, consult authorized service centers or qualified technicians.
Safety Reminder
Always operate the Icom IC-551/IC-551D in accordance with local regulations and licensing requirements. Avoid transmitting near sensitive electronic equipment or medical devices to prevent interference. Use only manufacturer-approved batteries and accessories to ensure safety and device compatibility. When servicing the transceiver, disconnect the battery and follow proper electrostatic discharge (ESD) precautions to protect internal circuits.