TS830.7                     TS830S Frequency shift

If you experience an intermittent shift in display and operating frequency,
the cause will be a loose screw on the AF-AVR unit heat sink.

On the AF-AVR unit X49-1140-00, there are three self-tapping screws holding
the aluminum heat sink to the PCB. These also supply the ground connection
to that section of the board. Between the heat sink and the PCB foil, add a
tooth lockwasher at the two accessible self-tapping screws.

                              Procedure:
   1. Remove the top cover (8 screws) and unplug the speaker.
   2. Remove the bottom cover (8 screws).
   3. Remove 5 screws holding the AF-AVR and swing the board over. Leads
      do not have to be unplugged.
   4. Add the two tooth-lock washers between the heat sink and the PCB foil.
   5. To reassemble, reverse the above procedure.

Hal, N6AN