The only owner's manual I saw in searches was for $50 -
http://www.manuals-in-pdf.com/download-LBTD307-SONY-p-271615.html
I saw a number of free Service Manuals for it, but those are for repair rather than instruction in use.
SONY LBTD307 Owner Manual
Get free manual
https://freeonlineservicemanual.blogspot.com/2021/07/sound-audio-sound-instrument-manual.html?showComment=1625353857089&m=1#c1718629861852162499
SOURCE: Finding an Instruction Manual for Sony stereo system
How do I remove the protect mode from my Sony LBT-LX5 Stereo?
SOURCE: istruction manual for a sony
This was very difficult to find, but I found it just for you! Please make sure you rate my answer 4 thumbs up! Thanks so much for understanding, it would be a huge help to me. I would be forever grateful if you could do this for me. To view the manual you will need adobe reader, which you can get for free from http://get.adobe.com/reader/ You probably already have it though, please try opening the file first and find out. Here is the manual / guide please give it a few minutes the file is quite large:
http://micromatikal.dlinkddns.com:8000/cust/d570.pdf
The problem appears to be in the selector chip or the microprocessor ic, a schematic would be the next step to narrow down the field.
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