[Premium-Rx] Tentec RX340 Malfunction Mystery

[Arthur Delibert]

I'm wondering if anyone has any insight into the following problem:  My RX340 has lost the ability to tune via the tuning knob, and there is nothing displayed where one would normally see and select the Step size ( 1 Hz, 10Hz, etc.).

Otherwise, it seems to be normal -- i.e., it receives, and the frequency and frequency display can be changed via the keyboard or by recalling a memory.  They "aux parameters" and "memory scan" sections of the display look and work normally (except that when the receiver is first turned on, the memory scan area displays "pty" and that doesn't go away when I tune memories).

I would appreciate if anyone can share any insights.

Thanks.
Art Delibert, KB3FJO