markn2wae
Mark T N2WAE
My ST-7405 tuner has a strange problem.
Depending if the tuner is hot or cold, the "opto lock" control high "good" or low when indicating it is tuned.
For example, depending on the temperature of the set, when I tune in "104.30" on the dial and let go of the knob, it will go to 104.29, 104.30, or 104.31.
I have found a coil inside the set to "fix" the problem, but next time there is a temperature change, it's "off" again.
I have no way of knowing if the "mis-tuning" is just a display error or the actual signal is being mis-tuned also.
There is no switch to defeat this action other than your fingers touching the tuning dial, I do like this feature if it can only be made to work properly, other wise the set plays fine.
So far, I haven't found a schematic or service manual for it yet. :sigh:
Mark T.
Depending if the tuner is hot or cold, the "opto lock" control high "good" or low when indicating it is tuned.
For example, depending on the temperature of the set, when I tune in "104.30" on the dial and let go of the knob, it will go to 104.29, 104.30, or 104.31.
I have found a coil inside the set to "fix" the problem, but next time there is a temperature change, it's "off" again.
I have no way of knowing if the "mis-tuning" is just a display error or the actual signal is being mis-tuned also.
There is no switch to defeat this action other than your fingers touching the tuning dial, I do like this feature if it can only be made to work properly, other wise the set plays fine.
So far, I haven't found a schematic or service manual for it yet. :sigh:
Mark T.