|
Symptom:
|
|
Low RX sensitivity on 2-meters.
|
|
|
Probable Cause:
|
Burned D6 on PA unit.
|
|
|
Cure:
|
Replace D6 (MA862).
|
|
|
|
|
|
Symptom:
|
|
No TX power output on an HF band.
|
|
|
Probable Cause:
|
Bad filter relay.
|
|
|
Cure:
|
Locate and replace faulty filter relay (will be type AHY-103).
|
|
|
|
|
|
Symptom:
|
|
Low/distorted RX audio.
|
|
|
Probable Cause:
|
Burned foil trace on PLL unit.
|
|
|
Cure:
|
Repair SPE (ground) foil trace on PLL unit.
|
|
|
|
|
|
Symptom:
|
|
Low TX output on HF & 6-meters.
|
|
|
Probable Cause:
|
Shorted D18 and Q1 in filter unit.
|
|
|
Cure:
|
Replace D18 (DAP222) and Q1(2SC4081).
|
|
|
|
|
|
Symptom:
|
|
Inadequate mic gain.
|
|
|
Cure:
|
Install field mod on main unit: Change value of R236 from 27k, to 68k-82k. [The higher the resistor value, the greater increase in mic gain].
|
|
|
|
|
|
Symptom:
|
|
Thin-sounding mic audio.
|
|
|
Cure:
|
Install field mod inside HM-103: Remove rubber gasket from beneath mic element.
|
|
|
|
|
|
Symptom:
|
|
Off frequency in FM TX.
|
|
|
Probable Cause:
|
FM VCO lock voltage needs adjustment.
|
|
|
Cure:
|
Adjust FM VCO lock voltage for 1.5 volts as per service manual.
|
|
|
|
|
|
Symptom:
|
|
Unit is stuck in TX mode.
|
|
|
Probable Cause:
|
Shorted T/R switch transistor.
|
|
|
Cure:
|
Replace shorted Q32 in main unit.
|
|
|
|
|
|
Symptom:
|
|
Radio won't power up.
|
|
|
Probable Cause:
|
Burned ground foil trace in flex cable.
|
|
|
Cure:
|
Replace flex cable EP2 at main board.
|
|
|
|
|
FAQ Index Page | Amateur Radios
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©1997 ICOM America, Inc. The ICOM logo is a registered
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.
