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AH-2, AH-3, AT-120 Most Common Service | Radioaficion Ham Radio

AH-2, AH-3, AT-120 Most Common Service

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Most Common Service Questions about the AH-2, AH-3 and AT-120

©1997 ICOM America, Inc.



Symptom: Won't start tuning.
Probable Cause: Faulty regulator.
Cure: Replace faulty IC9 8-volt regulator.


Symptom: Won't start tuning.
Probable Cause: Start line goes low, but key line remains high.
Cure: Replace faulty Q2, Q3, or Q4 transistors.


Symptom: Won't tune on some bands.
Probable Cause: Faulty !C10, IC11, or IC12.
Cure: Replace faulty ICs.
Remarks: Check resistor-cap pairs next to relays for signs of overheating.


Symptom: In AH2 controller: "TUNE" and "THRU" LEDs don't work.
Probable Cause: Faulty IC1 and/or IC2 5-volt regulator.
Cure: Replace defective parts.
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