| Symptom: |
Radio will not transmit
or receive after warm-up. |
| Probable
Cause: |
PLL unlock. |
| Cure: |
Replace unstable C228
trimmer capacitor with a ceramic equivalent and adjust the lock
voltage for 2 volts instead of 2.5 volts as stated in the manual. |
|
|
| Symptom: |
Carrier output when mic
is keyed in SSB mode, distorted TX audio. RF feedback. |
| Probable
Cause: |
RF feedback. |
| Cure: |
Add a ground jumper at
J10 connector, pin 4 on main unit. |
|
|
| Symptom: |
Won't operate tuner. |
| Probable
Cause: |
S1 and/or S2 switches
on the logic are not set in the proper position. Q52 transistor may
be bad. |
| Cure: |
Set switches correctly.
Check Q52 transistor for failure. |
|
|
| Symptom: |
No display. |
| Probable
Cause: |
IC5 chip and C12
capacitor blown on logic unit. |
| Cure: |
Replace blown IC5 IC
and C12 capacitor. |
|
|
| Symptom: |
Radio won't turn off. |
| Probable
Cause: |
Bad Q1 transistor on
relay unit. |
| Cure: |
Replace Q1 transistor. |
