The Icom service manual for the IC-P4AT/ET UHF FM transceiver provides detailed information on setup, operation, and troubleshooting across different versions, including specifications, circuit descriptions, adjustment procedures, and parts lists. It emphasizes safety precautions such as avoiding exposure to liquids and ensuring correct power supply connections to prevent damage to the transceiver.
Manual Overview
The Icom IC-P4AT/ET UHF FM Transceiver service manual provides detailed guidance for technicians on troubleshooting, diagnostics, and adjustments. The manual includes a troubleshooting flow that advises technicians to ensure problems are internal before disassembly and to disconnect the transceiver from power before opening. It emphasizes using insulated tools for adjustments and advises against keeping the power on for extended periods if the transceiver is defective. Error codes and diagnostics are not explicitly detailed, but the manual includes sections on circuit descriptions and board layouts that can aid in identifying issues at the board level. Calibration and adjustments are covered in detail, particularly for the PLL, receiver, and transmitter circuits, with specific procedures outlined for each. The manual also includes board-level guidance, with layouts for logic, main, and various other units, providing a comprehensive overview of the internal structure. Technicians are reminded to use a 40 dB to 50 dB attenuator when connecting test equipment to avoid damage.
Quick Issues Covered
- Diagnose power-up failures with voltage diagram reference.
- Adjust PLL circuits for frequency stability.
- Trace circuits using detailed schematics for component faults.
Overview
This service manual provides detailed service information for the IC-P4AT and IC-P4ET UHF FM Transceivers. It covers four different versions of these transceivers, designed for various regions including Europe, USA, Australia, and Asia. The manual includes sections on specifications, inside views, circuit descriptions, mechanical parts and disassembly, parts list, adjustment procedures, board layouts, optional units, block diagrams, and voltage diagrams. It also provides repair notes and guidelines for ordering replacement parts.
Specifications
- Frequency coverage: U.S.A. 440~450 MHz, Australia 430~440 MHz, Asia 430~440 MHz, Europe 430~440 MHz
- Mode: FM
- Tuning steps: 5, 10, 12.5, 15, 20, 25, 30 or 50 kHz
- Dial select steps: 100 kHz or 1 MHz
- Number of channels: Memory channels 100, Call channel 1, Scan edge channels 2
- Antenna impedance: 50 Ω (nominal)
- Usable battery pack or case: BP-110~BP-114
- External DC power supply: 6~16 V DC (negative ground)
- Current drain (at 13.8 V DC): Transmit High 1.8 A, Low 950 mA, Power saved 19 mA (typical), Receive Rated audio output 250 mA
- Usable temperature range: —10 °C~+60 °C (+14 °F~+140 °F)
- Frequency stability: ±5 ppm (0 °C~+50 °C; +32 °F~ +122 °F)
- Dimensions (with BP-111): 49 (W)x 105 (H) x 38.5 (D) mm, 1.9 (W) x 4.1 (H) x 1.5 (D) in (Projections not included)
- Weight (with BP-111): 280 g (9.9 oz)
- Output power (at 13.8 V DC): 5.0, 3.5, 1.5 W or 500 mW (selectable)
- Modulation system: Variable reactance frequency modulation
- Max. frequency deviation: ±5 kHz
- Spurious emissions: Less than —60 dB
- Microphone impedance: 2 kΩ
- Heatsink duty cycle: Transmit: Receive=1 min.: 3 min.
- Receive system: Double-conversion superheterodyne
- Intermediate frequencies: 1st 30.875 MHz, 2nd 455 kHz
- Sensitivity: Less than 0.16 µV for 12 dB SINAD
- Squelch sensitivity (threshold): Less than 0.1 µV
- Selectivity: More than 15 kHz/—6 dB, Less than 30 kHz/—60 dB
- Spurious response rejection: Less than —60 dB
- Audio output power: 200 mW at 10 % distortion with an 8 Ω load
- Audio output impedance: 8 Ω
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
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Safety & Warnings
NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than 16 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~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 – 11.6 MB)
Icom IC-P4AT/IC-P4ET Service Manual PDF (11.6 MB): Guides technicians in troubleshooting and repairing Icom IC-P4AT and IC-P4ET models.
- Brand: Icom-ic-p4at-ic-p4et-service
- Model: MANUAL
- Type: Service manual
- File size: 11.6 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-p4at-ic-p4et-service MANUAL Overview
The Icom IC-P4AT and IC-P4ET are compact, handheld transceivers designed for reliable two-way communication. Ideal for both professional and personal use, these devices provide clear audio transmission and robust performance in various environments. This service manual offers detailed instructions for maintenance, repair, and operation to ensure optimal functionality and longevity of your Icom transceiver.
Main Features and Specifications
- Frequency Range: VHF 136-174 MHz
- Output Power: 5 Watts (High), 1 Watt (Low)
- Channel Capacity: 16 Channels
- Battery Type: Rechargeable NiMH Battery Pack
- Display: LCD with Channel and Battery Status
- Emergency Alert Function
- Compact and Lightweight Design
- Water-Resistant Construction (IP54)
Basic Usage and Operation Tips
To operate the Icom IC-P4AT/IC-P4ET, first ensure the battery is fully charged. Turn the device on using the power switch and select the desired channel with the channel selector knob. Adjust the volume to a comfortable level. Press the Push-To-Talk (PTT) button to transmit and release it to listen. For best communication quality, hold the microphone about 2-3 cm from your mouth and speak clearly. Utilize the emergency alert feature in critical situations to send a distress signal to other units.
Troubleshooting and Maintenance Notes
If you experience poor audio quality or reduced transmission range, check the antenna connection and ensure the battery is charged. Regularly clean the exterior and connectors with a soft, dry cloth to prevent dust buildup. Avoid exposing the device to extreme temperatures or moisture beyond its specifications. If the unit fails to power on, try replacing or recharging the battery. Refer to this service manual for detailed repair procedures and parts replacement instructions.
Safety Reminder
Always use the Icom IC-P4AT/IC-P4ET transceiver according to the manufacturer's guidelines. Avoid operating the device while driving or in hazardous environments where distraction could lead to accidents. Keep the device away from water and extreme heat to prevent damage. Only use approved accessories and batteries to ensure safe and reliable operation.