Philips receiver FR 931 - diyAudio
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Old 11th June 2011, 01:02 PM   #1
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Default Philips receiver FR 931

Problem whit surround speakers (they do not hear anything, no output sound). must to connect all the speakers(center and surround speakers ) to activate the surround mode ? the speakers must be with a certain impedance ? Can anyone help me with a service manual? thank you very much!
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Old 12th June 2011, 10:59 AM   #2
frenzic is offline frenzic  Netherlands
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I Use a FR951 in my no frills easy listening system. You have to activate surround mode by pressing a button. It is only pro logic though, which is analogue and encoded in a rather crude way in the stereo signal. That probably explains why you do not hear anything other than stereo when you play ac3 or dts surround media. I put up the pdf I have of the FR951. Not sure if that helps, but there you go.

https://rapidshare.com/files/2452213...0s_dfu_eng.pdf

Click the image to open in full size.
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Old 12th June 2011, 11:17 AM   #3
frenzic is offline frenzic  Netherlands
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After a think through I suggest you hook up your source via analogue stereo and then set the surround mode on the receiver. Also hook up all the speakers. This will get you pseudo surround and is the only way to do it since the dolby specs on the FR are obsolete.
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Old 12th June 2011, 10:50 PM   #4
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thanks for the feedback ...I tested with four speakers without center (I do not have one yet), with pro logic activated... and nothing! perhaps because the center speaker is not coupled do not hear anything on the other in surround mode? a kind of protection for the receiver?
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Old 13th June 2011, 09:34 AM   #5
frenzic is offline frenzic  Netherlands
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Did you push the button for speaker group b? It happens a lot with these babies that the contacts in the section containing the surround button and tone controls wear out, in that case you need a screwdriver and some spray. Don't worry, it is self explanatory once you remove the lid. If that still won't work you could also check for any broken wiring surrounding the tone control section.
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Old 13th June 2011, 04:13 PM   #6
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with four speakers conected in group a and b it work....in stereo mod with a and b activated
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Old 14th June 2011, 07:59 AM   #7
frenzic is offline frenzic  Netherlands
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So the amps work fine. It must be a source problem or the surround button does not make contact. What is your source, what are it's output settings and how did you hook it up?
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Old 14th June 2011, 05:42 PM   #8
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the source is a PC and the signal is taken from line out
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Old 18th June 2011, 05:00 PM   #9
frenzic is offline frenzic  Netherlands
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Well that should work ok. Get out the spray then.
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Old 19th June 2011, 04:11 PM   #10
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I left it with speakers connected to A and B. the surround not know how to make it work
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