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The problem with my Optimus STA-300 is very strange.It only retains the stored settings if the source is AM.If any other source is selected(FM,tape,phono,CD/Aux), it looses data when powered down.Does anyone have a service manual or schematics for this receiver?I opened the unit, but could not identify a battery or special capacitor for the memory circuit.

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The unit should store FM stored settings without a battery backup. As long as it is plugged in, the memory for the FM side of the circuit board should do the same thing, logically, as the AM mode side of things.

http://support.radioshack.com/support_audio/doc8/8125.htm

troubleshooting document, but doesn't include symptoms of Source being selected or not selected with AM vs. FM, respectively.
http://support.radioshack.com/support_audio/doc11/11695.pdf

exploded parts diagram above.

I think the board is defective.

http://support.radioshack.com/support_tutorials/audio_video/afq-3101991.htm

The manual is no longer available for this model.

I used to work for radio shack in the 1990s and these fax back documents look familiar. But, I think that this Optimus Receiver is not repairable anymore, even by the Radio Shack service centers.

Sorry about that.

Posted on Jul 20, 2010

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