| Symptom: |
Won't start tuning. |
| Probable
Cause: |
Faulty regulator. |
| Cure: |
Replace faulty IC9
8-volt regulator chip. |
|
|
| 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 IC10, IC11, or
IC12 chips. |
| 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 chip and/or
IC2 5-volt regulator. |
| Cure: |
Replace defective
parts. |
