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Old 31st March 2005, 01:37 PM   #1
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Default Schematic for Sony STR-D311 needed

I just fixed a friend's Sony receiver. Nothing special. Put in new Sankens on one channel. Sounds good, and has been running on the test bench speakers for about 5 hours.

Thing is, when I push the B speaker switch to on (nothing connected) sound stops on the A speakers. Seems strange. Just wanted to check the schematic to see if it is supposed to do this for some reason if there is nothing hooked up to B. The B switch is a different type than the A switch for some reason. Just seems strange and wanted to be sure all is well before giving it back.

Nothing bad seems to be happening when B is on (outputs don;t heat up or anything) and music comes back as soon as it is switched back off.

Hmmm...
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Old 31st March 2005, 04:48 PM   #2
macboy is offline macboy  Canada
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This is a low end receiver, and as such, the two speaker sets are wired in series (not parallel) when you activate both. So when you push the B button without any speakers connected to A, the circuit is open and voila, no sound. I've attached a clipping from the schematic of another low end Sony receiver (STR-DE405). You can see how the speakers are connected by examing it.
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Old 31st March 2005, 05:21 PM   #3
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Thans I thought it might be something like that, then I thought, naw, it couldn't be THAT cheap.
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Old 1st April 2005, 01:16 AM   #4
anatech is offline anatech  Canada
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Yup, it is. Just fixed a Pioneer that does the same thing.

-Chris
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Old 1st April 2005, 11:07 AM   #5
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At least it's not mine
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Old 2nd April 2005, 01:15 AM   #6
anatech is offline anatech  Canada
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Oh yeah! Ditto.
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