| Symptom: |
No TX output. |
| Probable
Cause: |
Bad Q32 transistor on
RF unit. |
| Cure: |
Replace Q32 transistor
(2SC4673D) on RF unit. Also check for leaky D37 diode (MA862) on RF
unit. |
|
|
| Symptom: |
Raspy RX audio when
warm, sounds like intermodulation. |
| Probable
Cause: |
Leaky D37 diode on RF
unit. |
| Cure: |
Replace D37 diode
(MA862). |
|
|
| Symptom: |
TX LED indicator does
not light. |
| Probable
Cause: |
R105 resistor on SW-A
unit has been knocked loose during shipping. |
| Cure: |
Replace or resolder
R105 resistor (1.8 K) |
| Remarks: |
R105 resistor is a
surface-mount component. |
|
|
| Symptom: |
Harsh TX CW note. |
| Probable
Cause: |
Unit needs factory
update. |
| Cure: |
Change value of
tantalum capacitor C18 on IF unit to 3.3 µF, 16 V. |
|
|
| Symptom: |
Radio is dead, does not
power-up. Radio powers up if VCC line to PA is disconnected. |
| Probable
Cause: |
Shorted PA FETs. |
| Cure: |
Replace both PA FETs. |
|
|
| Symptom: |
Display dims in CW TX
when AF volume is turned up. |
| Probable
Cause: |
Unit requires factory
update to logic unit. |
| Cure: |
Contact Icom Technical
Support for update procedure. |
|
|
| Symptom: |
In a brand new radio,
rotary encoder shaft does not turn smoothly; feels rough. |
| Probable
Causes: |
Shipping damage to
rotary encoder. |
| Cure: |
Replace rotary encoder. |
