The Icom IC-2A/AT/E maintenance manual provides detailed instructions on the setup, operation, and troubleshooting of the 144MHz FM transceiver, including descriptions of operating controls, circuit functions, and maintenance procedures. It also includes sections on disassembly, adjustment, and a comprehensive troubleshooting guide to assist users in resolving common issues.
Manual Overview
The Icom IC-2A/AT/E maintenance manual provides detailed guidance for servicing the 144MHz FM transceiver. The troubleshooting section outlines a systematic flow for diagnosing issues, emphasizing the importance of understanding error codes and diagnostics for efficient problem resolution. Technicians are advised to follow the preliminary checks and basic alignment procedures before delving into more complex repairs. Calibration and adjustments are crucial for maintaining optimal performance, with specific instructions provided for measuring instruments required during these processes. Board-level guidance is detailed in the circuit description and block diagram sections, which explain the functions of receiver, transmitter, and PLL circuits. The manual includes a comprehensive board layout and voltage charts to assist technicians in identifying and resolving issues at the component level. Disassembly instructions are provided to facilitate access to internal components, ensuring technicians can perform necessary repairs and adjustments effectively.
Quick Issues Covered
- Diagnose power-up failures using voltage charts and schematics.
- Troubleshoot receiver circuit issues with detailed circuit descriptions.
- Use schematic diagrams for effective circuit tracing and repairs.
Overview
The IC-2A/AT/E is a 144MHz FM transceiver, and the maintenance manual provides detailed information on its specifications, operating controls, circuit descriptions, block diagrams, mechanical parts, maintenance and adjustment procedures, board layout, voltage charts, troubleshooting, IC specifications, parts list, and schematic diagrams. The manual covers aspects such as the transceiver’s frequency coverage, power supply requirements, transmitter and receiver specifications, and control functions.
Specifications
- Number of Semiconductors
- Transistors 43 (42) <41>
- FET 3
- IC 5 [6] (6)
- Diodes 21 (20)
- Frequency Coverage
- 144.000 ~ 147.995MHz: IC-2Au, IC-2A0, IC-2AT, IC-2E1
- 144.000 ~ 145.995MHz: IC-2E0L
- Frequency Resolution
- 5KHz steps 800 channels or 400 channels
- Frequency Control
- Digital PLL synthesizer, with thumbwheel switches
- Frequency Stability
- Within +1.5KHz
- Usable Temperature
- ~10°C ~ 60°C (14°F ~ 140°F)
- Antenna Impedance
- 50 ohms unbalanced
- Power Supply Requirement
- DC 8.4V; with attendant power pack IC-BP3, DC 6 ~ 12V
- negative ground is acceptable
- Current Drain at 8.4V
- Transmitting
- HIGH : 1.5W Approx. 550mA
- LOW : 0.15W Approx. 220mA
- Receiving
- At max audio output Approx. 130mA
- Squelched Approx. 20mA
- Dimensions
- 116.5mm (H) x 65mm (W) x 35mm (D) without power pack
- Attendant power pack, IC-BP3 49mm (H) x 65mm (W) x 35mm (D)
- Weight
- 470g [490g] including power pack, IC-BP3 and flexible antenna
- TRANSMITTER
- Output Power
- HIGH: 1.5W, LOW: 0.15W at 8.4V
- Emission Mode
- 16F3
- Modulation System
- Variable reactance frequency modulation
- Max. Frequency Deviation
- 45KHz
- Spurious Emission
- More than 60dB below carrier
- Microphone
- Built-in electret condenser microphone
- Optional speaker-microphone (IC-HM9) can be used
- Operating Mode
- Simplex
- Duplex +600KHz from receive frequency
- RECEIVER
- Receiving System
- Double-conversion superheterodyne
- Modulation Acceptance
- 16F
- Intermediate Frequency
- 1st: 10.695MHz
- 2nd: 455KHz
- Sensitivity
- More than 26dB S+N+D/N+D at 1nV
- Less than 0.5uV for 20dB noise quieting
- Squelch Sensitivity
- Less than 0.4uV
- Spurious response rejection ratio
- More than 60dB
- Selectivity
- More than +7.5KHz at —6dB point
- Less than +15KHz at —60dB point
- Audio Output Power
- More than 300mW
- Audio Output Impedance
- 8 ohms
Controls & Indicators
TOP PANEL
– SQUELCH CONTROL: Sets the squelch threshold level. Rotate counterclockwise to turn off the squelch function and clockwise to increase the threshold level.
– VOLUME CONTROL (and TONE CALL SWITCH): Controls audio output level. Clockwise rotation increases audio output. For IC-2E, it also functions as a Tone Call Switch for accessing repeaters.
– TRANSMIT/BATTERY INDICATOR: Illuminates in transmit mode and indicates battery condition.
– ANTENNA CONNECTOR: Connects the supplied flexible antenna or an external antenna using a BNC connector.
– EXTERNAL MIC JACK: Connects an external microphone, disabling the built-in microphone.
– POWER SWITCH: Controls the power supply to the device.
– EXTERNAL SPEAKER JACK: Connects an external speaker or earphone, disabling the built-in speaker.
– 5KHz SHIFT SWITCH: Adjusts the frequency by adding 5KHz.
– 10KHz THUMBWHEEL SWITCH: Sets the 10KHz digit of the operating frequency.
– 100KHz THUMBWHEEL SWITCH: Sets the 100KHz digit of the operating frequency.
– 1MHz THUMBWHEEL SWITCH: Sets the 1MHz digit of the operating frequency.
FRONT PANEL
– PUSH TO TALK (PTT) SWITCH: Press to transmit and speak into the microphone.
– TWO-TONE ENCODER PAD (IC-2AT): Used for autopatch, accessing closed repeaters, and other controls.
– RF POWER SWITCH: Selects RF output power (HIGH 1.5W or LOW 0.15W).
– DUPLEX/SIMPLEX SWITCH: Selects operation mode (DUPLEX for repeater, SIMPLEX for same frequency).
– DUPLEX MODE SWITCH: In DUPLEX mode, selects transmitting frequency 600KHz above or below receiving frequency.
– CHARGER CONNECTOR: Connects to the wall charger or other power source.
– BATTERY CHARGE INDICATOR: Lights during battery charging.
Installation / Setup
Refer to the PDF for details.
Operation
The manual does not provide specific basic usage steps or operation modes in the provided sections.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Service manual (PDF – 7.6 MB)
Service manual for Icom IC-2A/IC-2AT/IC-2E. Guides technicians in troubleshooting, calibration, and assembly. File size: 7.6 MB.
- Brand: Icom-ic-2a-ic-2at-ic-2e-service
- Model: MANUAL
- Type: Service manual
- File size: 7.6 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-2A / IC-2AT / IC-2E Service Manual Overview
The Icom IC-2A, IC-2AT, and IC-2E are compact handheld transceivers designed for reliable two-way radio communication. These models are widely used by amateur radio enthusiasts and professionals for clear voice transmission over VHF frequencies. This service manual provides detailed technical information, schematics, and repair guidelines to assist technicians and users in maintaining and servicing these radios effectively.
Main Features and Specifications
- Frequency Range: VHF band coverage suitable for amateur radio use
- Power Output: Adjustable transmission power for efficient battery use
- Channel Memory: Multiple programmable channels for quick access
- Compact and Lightweight Design: Portable for field and mobile operations
- Built-in Squelch Control: Reduces background noise for clearer reception
- Battery Powered: Rechargeable battery pack for extended use
- Durable Construction: Designed to withstand daily operational wear
Basic Usage and Operation Tips
To operate the Icom IC-2 series transceivers, first ensure the battery is fully charged. Turn the unit on and select the desired channel using the channel selector knob. Adjust the squelch control to minimize background noise without cutting off weak signals. Press and hold the push-to-talk (PTT) button to transmit your voice, releasing it to listen. Regularly check the antenna connection for optimal signal quality. Familiarize yourself with the manual’s detailed controls to maximize functionality.
Troubleshooting and Maintenance Notes
If you experience poor transmission or reception, verify battery charge and antenna condition first. Intermittent audio or failure to power on may indicate battery or internal component issues, which can be diagnosed using the service manual’s schematic diagrams. Clean the battery contacts and connectors periodically to prevent corrosion. For persistent problems, refer to the troubleshooting section in the manual for step-by-step repair procedures.
Safety Reminder
Always operate the transceiver in accordance with local regulations and licensing requirements. Avoid transmitting near sensitive electronic equipment or medical devices. Do not attempt repairs unless you are qualified; improper servicing can cause damage or injury. Use only manufacturer-approved batteries and accessories to ensure safe operation.