Most Common Service Questions about the AH-2, AH-3 and AT-120
The information on this page is subject to the terms
and conditions set forth on the ICOM America Service FAQ Index page.
| 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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©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.