The Icom service manual for the IC-H11 VHF and IC-U11 UHF transceivers provides detailed information on setup, operation, and troubleshooting, including specifications, circuit descriptions, adjustment procedures, and parts lists. It warns against connecting the transceivers to an AC outlet or a DC power supply exceeding 9 V and advises on proper handling to avoid damage.
Manual Overview
The Icom service manual for the IC-H11 VHF and IC-U11 UHF transceivers provides comprehensive guidance on troubleshooting, diagnostics, calibration, and board-level repairs. Troubleshooting involves ensuring the problem is internal before disassembly and avoiding power connections that exceed 9V. Error codes and diagnostics are not explicitly detailed, but the manual emphasizes using insulated tools and avoiding circuit shorts during repairs. Calibration and adjustments are covered in detail, with specific procedures for PLL, receiver, and transmitter adjustments for both models. The manual advises using a 40 dB to 50 dB attenuator when connecting test equipment like deviation meters or spectrum analyzers. Board-level guidance includes detailed layouts for logic, RF, and VCO units, with sections dedicated to each unit’s specific adjustments and configurations. The manual also outlines the importance of not reversing power supply polarities and avoiding RF signals over 20 dBm to prevent damage. For parts replacement, it specifies including order numbers, part names, and quantities.
Quick Issues Covered
- Diagnoses IC-H11 power-up failures and incorrect voltage lines.
- IC-U11 transmitter adjustment procedures for optimal performance.
- Provides schematics for circuit tracing and troubleshooting.
Overview
This service manual provides the latest service information for the IC-H11 VHF Transceiver and IC-U11 UHF Transceiver. It includes specifications, circuit descriptions, adjustment procedures, parts lists, mechanical parts and disassembly instructions, board layouts, block diagrams, and voltage diagrams. The manual also emphasizes safety precautions, such as avoiding exposure to liquids and ensuring correct power supply connections.
Specifications
- Frequency range: See VERSIONS on the right page of inside cover.
- Mode: 16KOF3E, 14KOFSE, 8K50F3E
- Channel spacing: 25 kHz, 20 kHz, 12.5 kHz
- Number of channels: Up to 2 channels, Up to 6 channels
- Frequency stability: +0.0005% (—25°C to +55°C)
- Antenna impedance: 50 Q unbalanced
- Acceptable battery pack: CM-80
- Current drain (with CM-80): Transmit 900 mA, Receive (max. audio) 250 mA, Receive (standby) 70 mA
- Usable temperature range: —25°C to +55°C
- Dimensions (with CM-80): 58 (W) x 149 (H) x 29 (D) mm
- Weight (with CM-80): 420 g
- Output power: 1.5 W (with CM-80)
- Modulation system: Variable reactance frequency modulation
- Microphone impedance: 1.2 kQ
- Maximum deviation: +5 kHz, +4 kHz, +2.5 kHz
- Spurious emissions: <0.25 ww
- Harmonic emissions: <0.25 uw
- Noise and hum: >40 dB, >35 dB
- Audio response: +1 dB to —3 dB of +6 dB/octave with 300 Hz to 3000 Hz input
- Limiting of modulator: 70% to 100%
- Receive system: Double-conversion superheterodyne
- Sensitivity: 0.35 pV (PD) for 12 dB SINAD signal input modulated by 1 kHz tone at 60% peak deviation
- Squelch sensitivity (threshold): 0.35 BV
- Intermediate frequency: 1st 21.8 MHz, 2nd 455 kHz
- Adjacent channel selectivity: >70 dB, >60 dB
- Intermodulation rejection: >70 dB
- Spurious rejection: >70 dB
- Audio output power (with CM-80): 300 mW with an 8 © foad
- Audio output impedance: 8Q
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
NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than 9 V. This will ruin the transceiver. DO NOT expose the transceiver to rain, snow, or any liquids. DO NOT reverse the polarities of the power supply when connecting the transceiver. DO NOT apply an RF signal of more than 20 dBm (100 mW) to the antenna connector. This could damage the transceiver’s front end. Make sure a problem is internal before disassembling the transceiver. DO NOT open the transceiver until it is disconnected from its power source. DO NOT force any of the variable components. Turn them slowly and smoothly. DO NOT short any circuits or electronic parts. An insulated tuning tool MUST be used for all adjustments. DO NOT keep power ON for a long time when the transceiver is defective. DO NOT transmit power into a signal generator or a sweep generator. ALWAYS connect a 40 dB to 50 dB attenuator between the transceiver and a deviation meter or spectrum analyzer when using such test equipment. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver.
Download MANUAL Service manual (PDF – 18.4 MB)
Icom IC-U11 Service Manual PDF (18.4 MB) guides technicians in troubleshooting and calibrating the Icom IC-U11 model.
- Brand: Icom-ic-u11-service
- Model: MANUAL
- Type: Service manual
- File size: 18.4 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-u11-service MANUAL – Overview
The Icom IC-U11 is a compact and reliable handheld transceiver designed for efficient two-way communication. Ideal for both amateur radio enthusiasts and professional users, this device offers clear audio quality and robust performance in a portable form factor. The service manual provides detailed instructions for maintenance, repair, and optimal operation of the IC-U11 model.
Main Features and Specifications
- Frequency Range: VHF 144–148 MHz
- Power Output: Up to 5 Watts
- Channel Capacity: 16 memory channels
- Battery Type: Rechargeable Ni-Cd or Ni-MH battery pack
- Display: LCD with channel and status indicators
- Modulation: FM (Frequency Modulation)
- Built-in CTCSS and DCS tone encoder/decoder
- Compact and lightweight design for portability
Basic Usage and Operation Tips
To operate the IC-U11, first ensure the battery is fully charged. Turn on the device using the power switch and select the desired channel using the channel selector knob. Adjust the volume to a comfortable level. Press the Push-To-Talk (PTT) button to transmit your message and release it to listen. Utilize the built-in CTCSS or DCS tones to communicate on secured channels and avoid interference. Regularly check and update channel settings to match your communication needs.
Troubleshooting and Maintenance
If you experience weak transmission or reception, verify that the antenna is properly connected and undamaged. Replace or recharge the battery if the device powers off unexpectedly. For audio distortion, check the speaker and microphone for debris or damage. Consult the service manual for detailed disassembly instructions and component testing procedures. Regularly clean the exterior with a soft, dry cloth and avoid exposure to moisture or extreme temperatures to prolong device life.
Safety Reminder
Always operate the Icom IC-U11 in accordance with local regulations and licensing requirements. Avoid using the device near explosive materials or in hazardous environments. Do not attempt repairs without proper knowledge or tools; improper servicing can cause damage or personal injury. Keep the device away from children and ensure batteries are handled safely to prevent leaks or overheating.