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General| Frequency Range | 144-148 MHz |
|---|---|
| Mode | FM |
| Receiver Sensitivity | 0.2 µV (12 dB SINAD) |
| Supply Voltage | 13.8 V DC |
| Sensitivity | 0.16 μV for 12 dB SINAD |
Guidance on obtaining help for operation, capability, and servicing from ICOM.
Information on how to order parts for efficient service.
Specifies the frequency ranges for different versions of the transceiver.
Outlines the voltage and current requirements for the power supply.
Details specifications related to the transmitter functionality.
Describes the receiver system architecture.
Details the receiver sensitivity with a 50-ohm load.
Details the receiver selectivity characteristics.
Explains the front panel layout and controls.
Detailed view and labeling of the front panel components.
Details the frequency display and its indicators.
Explains the rear panel layout and connectors.
Shows the internal view of PLL and Logic units.
Shows internal view of Main and RF YGR units.
Block diagram for IC-275A/E/H models.
Details on the receiver circuits of the transceiver.
Details the antenna and 1st mixer circuit functionality.
Details on noise blanker, notch filter, and FM detector circuits.
Description of mixer and AF amplifier circuits for SSB/CW.
Description of FM squelch, S-meter, and center meter circuits.
Details on the transmitter circuits of the transceiver.
Description of circuitry for CW mode transmit IF signals.
Description of TX Amp and Antenna circuits for IC-275A/E.
Description of the standby control circuit.
Description of the Phase Locked Loop (PLL) circuits.
Description of the DDS unit.
Description of the logic circuits.
Description of the reset circuit.
Description of the sensor circuit.
Explanation of the matrix used for controls.
Steps for disassembling the transceiver frame.
Steps for disassembling the front panel.
Steps for disassembling the rear panel.
Connector assembly for front, logic, and PLL units.
Connector assembly for front, main, and RF YGR units.
Connector assembly for PA and REG units (IC-275A/E).
Connector assembly for PA, CTRL, and Filter units (IC-275H).
Important precautions before performing maintenance or servicing.
Test instruments and locations for PLL adjustment.
Test instruments, locations, and values for frequency/tone adjustment.
Shows adjustment points on the logic unit.
Test instruments, locations, and values for receiver adjustment.
Continuation of receiver adjustments.
Test instruments and conditions for transmitter adjustment.
Continuation of transmitter adjustments.
Test instruments and conditions for transmitter adjustment.
Continuation of transmitter adjustments.
Component layout for Front Units (1).
Component layout for Front (SW-A) Unit.
Component layout for Front (VR-A) Unit.
Component layout for Front Unit (2).
Component placement on the front unit's component side.
Component details for logic and sensor units.
PCB layout and component connections for the logic unit.
Component details for PLL and DDS units.
PCB layout and component connections for the PLL unit.
Component details and PCB layout for the DDS unit.
Component details for the main unit.
PCB layout and component connections for the main unit.
Component details and PCB layout for the RF YGR unit.
Component details for the REG unit (IC-275A/E).
Component details for the PA unit (IC-275A/E).
Component details for the CTRL unit (IC-275H).
Component details for the PA unit (IC-275H).
Component details and PCB layout for the FILTER unit (IC-275H).
Voltage diagram for the front unit.
Voltage diagram for the logic unit.
Voltage diagram for the PLL unit.
Voltage diagram for the main unit.
Voltage diagram for the RF YGR unit.
Voltage diagrams for REG and PA units (IC-275A/E).
Voltage diagrams for CTRL, PA, and FILTER units (IC-275H).
List of EF parts.
List of parts for the front unit.
List of parts for reference units.
List of parts for the logic unit.
Continuation of logic unit parts list.
List of parts for the PLL unit.
List of parts for the main unit.
Continuation of main unit parts list.
Continuation of main unit parts list.
List of parts for the SQL unit.
List of parts for the RF YGR unit.
List of parts for the REG unit (IC-275A/E).
List of parts for the PA unit (IC-275A/E).
List of parts for the CTRL unit (IC-275H).
List of parts for the FILTER unit (IC-275H).
Schematic diagram of the front section.
Schematic diagram of the sensor section.
Schematic diagram of the logic section.
Schematic diagram of the tone SQL section.
Schematic diagram of the voice section.
Schematic diagram of the RAM section.
Schematic diagram of the main section.
Schematic diagram of the CTRL section.
Schematic diagram of the FILTER section.
Schematic diagram of the PA section.
Schematic diagram of the RF YGR section.
Schematic diagram of the logic section.
Schematic diagram of the DDS section.
Schematic diagram of the PLL section.
Schematic diagram of the RF YGR section.
Schematic diagram of the front section.
Schematic diagram of the sensor section.
Schematic diagram of the logic section.
Schematic diagram of the tone SQL section.
Schematic diagram of the voice section.
Schematic diagram of the logic section.
Schematic diagram of the main section.
Schematic diagram of the CTRL section.
Schematic diagram of the PA section.
Schematic diagram of the RF YGR section.
Schematic diagram of the logic section.
Schematic diagram of the DDS section.
Schematic diagram of the PLL section.
Schematic diagram of the RF YGR section.
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