IC-820H
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Symptom:
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Intermittent/no RX/TX. Display reads "_______".
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Probable Cause:
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PLL unlock.
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Cure:
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Replace bad X1 on PLL unit.
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Symptom:
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Some front panel controls on left side do not work. (mode switch, lock switch, etc...)
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Cure:
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Rework bad or cracked solder at J1 on SW-A unit.
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Symptom:
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Unit stuck in TX mode.
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Cure:
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Replace bad Q40 on main unit.
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IC-2340H
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Symptom:
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Any of the following: Cannot change band to UHF, no UHF volume or squelch control, no UHF tuning, or strange-sounding beep tone.
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Cure:
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Rework bad soldering at J3 on display unit and replace the SW-B board with a factory-modified flex PC board.
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Symptom:
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No audio output from receiver.
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Cure:
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Remove excessive solder on the Main-A unit near the audio amp.
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Symptom:
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Howling if volume is turned up when using UHF.
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Probable Cause:
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Microphonics in VCO section.
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Cure:
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Resolder the ground spring at the UHF VCO shield. You may also add a second spring for further improved resistance to microphones.
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IC-2700H
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Symptom:
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On the control head, cannot change bands on either VHF or UHF, no volume or squelch control, or no tuning control. Microphone control OK from mic.
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Cure:
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Repair bad soldering at J3 and J4 on the control unit and/or J1 on the SW-A and SW-B units. (There will be a factory-modified flex PC board, but as of 2/22/96 it has not yet been received by the parts department.)
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Symptom:
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No transmit on either band.
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Cure:
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Rework bad solder at J4 on logic unit and/or J2 on mic unit. (There will be a factory modified flex PC board, but as of 2/22/96 it has not yet been received by the parts department.)
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Symptom:
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No audio output from receiver.
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Cure:
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Rework bad soldering at the EXT SPKR jack on the Main-A unit.
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IC-281H
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Symptom:
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Cannot turn off, no volume control, no tuning control.
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Cure:
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Repair bad soldering at J4 and J5 in logic unit and/or J1 on SW-A and SW-B unit. Replace SW-A and SW-B unit with factory-modified flex PC boards.
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IC-RP1520/1620
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Symptom:
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Weak RX, sometimes weakness varies. Alignment does not help.
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Cure:
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C80 tantalum capacitor (1uF, 35v) on the receiver unit may be installed backwards. The PCB silk-screening is incorrect. Replace the capacitor with a new one.
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IC-970A/H
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Symptom:
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No RX/TX on 440mhz band. Dashed lines on display.
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Probable Cause:
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PLL unlock.
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Cure:
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LPL loop on the PLL-B unit is out of alignment and/or unstable. Replace the plastic trimmer with a ceramic 12pf type and realign.
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Symptom:
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Extremely low or no TX power output.
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Probable Cause:
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Broken solder connection at J2 on APC board.
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Cure:
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Repair solder connections. Reposition APC board upward to reduce stress on connector to prevent future failure.
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Symptom:
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No TX/RX, flashing dots (on LT version), flashing LED (on simple version).
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Probable Cause:
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Hidden system data has been lost.
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Cure:
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Clone from a working radio to computer and SAVE the file. Clone to radio to restore data.
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trademark of ICOM, Inc. All ICOM radios significantly exceed FCC
regulations limiting spurious emissions. All stated specifications are
subject to change without notice or obligation.
