Symptom:
Using the following key sequence will result in a failure to receive on VFO B.
- Select different frequencies for VFO A and B. (Example: 14.019 for VFO A and 14.018 for VFO B. Mode SSB, 2.7 KHz FILTER for 455 KHz and 8.83 MHz).
- Select VFO A to RX and VFO B to TX. The press the TF-W key.
- Press the ENT key and select a frequency in the 7 MHz band. (For example: 7.018 MHz for VFO A and 7.019 for VFO B).
- Press the ENT key and reselect the 14 MHz band.
- Change VFO B from TX to RX. The FILTER display for 8.83 dissapears and reception is disabled on VFO B.'
Countermeasure:
Press the 8.83 MHz FILTER select key one time, or replace the ROM chip.
Parts required:
Qty Description Old part No. New Part No Circuit Description
1 ROM 27C512BJDUG 27C512BJDUJ IC-19
or
1 ROM 27C512BJDVG 27C512RJDVJ IC-19
Time required for this modification is 30 minutes or less.
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