| Symptom: |
Radio is off frequency. |
| Probable Cause: |
2nd L.O. needs alignment. |
| Cure: |
Align L39 coil on PLL unit: Set displayed frequency to
511.9999 MHz and adjust L39 coil for 768.0000 MHz at J6 test point on PLL
unit. |
| Remarks: |
This is a common problem in the IC-R7000. We recommend
that the 2nd L.O. frequency be checked on all IC-7000s that are in need
of repair. |
|
|
| Symptom: |
No digital display when the radio warms up. |
| Probable Causes: |
1) Faulty DC-DC converter on display unit. 2) Bad solder
at flex cable between display unit and DS1 display. |
| Cure: |
Replace dried-out electrolytic capacitors in display unit.
Resolder cracked joints at display flex cable. |
|
|
| Symptom: |
Low RX on all bands. |
| Probable Cause: |
Incorrect voltages from DC-DC unit. |
| Cure: |
Check for correct output voltages at J2 connector of the
DC-DC board. Replace C1 and C2 capacitors (both 33 µF, 16v) on the DC-DC
unit if voltages are incorrect. |
|
|
| Symptom: |
Distorted audio in FM mode, especially as unit warms-up. |
| Probable Cause: |
Bad capacitor on IF unit. Unit needs update. |
| Cure: |
Replace electrolytic capacitor C135 on IF unit and update
IF unit: Install a 100 K resistor between the negative side of C135 capacitor
and ground. |
