Step 1: Ensure that your Blu-ray player has an HDMI output and your Sony Home Theater system has an HDMI input.
Step 2: Connect an HDMI cable from the HDMI output on your Blu-ray player to the HDMI input on your Sony Home Theater system.
Step 3: Use the Input or Source button on your Sony Home Theater system to select the HDMI input to which you connected your Blu-ray player.
Step 4: Turn on your Blu-ray player and the Sony Home Theater system.
Step 5: Use the Speakers or Audio Setup option on your Blu-ray player to set the audio output to Bitstream or PCM. This should enable your connected speaker setup through the AV Receiver on your Sony Home Theater system.
Now you should be able to enjoy surround sound when playing Blu-ray discs. Please ensure your home theater configuration, including speaker arrangements and calibration (automatic and manual), matches your expectations, preferences, and the physical limitations of your entertainment space. Some advanced options may even involve customizing speaker levels and delays for an immersive experience or simulating various room environments such as a concert hall or movie theater ambiance with virtual surround. Feel free to explore other menu options for further tweaking according to your needs.