When tuning the Main Encoder of the TS-450S/690S with bare hands you may encounter a "scratching" noise in the speaker if an antenna with a high SWR is used. If gloves are worn no problem is encountered. This occurs because the shaft of the encoder is not grounded.
Replace the Main Encoder with one that has a grounded shaft.
Qty Description Part No.
1 Main encoder W02-1836-05
2 Mounting screws N90-3006-46
Note: You must use the new mounting screws listed above with the replacement encoder.
Time required for this modification is 30 minutes or less.