Check Optical Interrupter Bias, section 5-5.4, and Optical Interrupter Mechanical Adjustment 5-5.d. Note that a mechanical VTVM or VOM is specified for alignments. If all that is good check the direction logic, 5-5.7.
73,
-Jim
NU0C
On Mon, 19 Feb 2024 21:36:43 -0800
"K6OXN Bob" <bobk6oxn@...> wrote:
The RV-75 I am working on, only decrements it will not increment. Either way I turn it, it only goes down in freq. Any clues are most helpful.
Jim Shorney