Optical cable plugged in but is not a selectable input in a Sony receiver STR-K750p

[sdowney717]

Hi, I recently thought to get an optical cable to compare how it sounds with a coax cable with DD 5.1.
The cable connects to an HDMI switch that extracts audio to both coax and optical.
The coax works good with the Sony. The optical does not work at all, I do see a red light on the cable output.
On the Sony receiver you do an input select of auto, coax, optical or analog.
However the receiver skips right past optical, it never appears in the menu to be selected.
Does that mean the Sony does not see an optical signal? Now get this, I have another Sony same model and it does same exact thing, skips past it.

I dont have another cable to test and thinking of returning it to Amazon, It is an Amazon Basic cable.
This is the manual page that tells you what to do

 

[Randyman...]

Is Optical selected for a different input? Possibly only assignable to one-at-a-time (disable on the other input). Also - try "Auto" with the Coax disconnected.

I doubt you will experience any difference - but experimenting is fun, and you are learning more about your equipment!

 

[Randyman...]

Actually - looking at a pic of the rear panel - it says "Optical / Video 2 in". I had a receiver with that behavior before - you had to select a certain input for Optical to be available, and a different one for Coax to be available (DVD in)...

Digital component hookups - Sony STR-K750P Manual - Page 10 of 52

Sony STR-K750P manual : Digital component hookups

manualsbrain.com

 

[sdowney717]

I just solved this. Yes, Optical input is only selectable on like video 2.
DVD is coax with no optical. Why would they do that? It caused me a lot of confusion.
Instructions implies to me that you press input select and it offers all the input choices regardless of the video source selected.