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Marantz DP870 No Code, or should I say no sound

I have enjoyed may years of great sound from this unit. I had a DTS decoder upgrade performed to the unit may years ago with no issues. Right now the unit will only power on...will not switch between any modes either optical, coaxial, or by-pass mode. Tryed playing a DTS only audio disk, and no sound at all will come out. Any ideas?

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  • Anonymous Mar 05, 2009

    Initially the problem can be rectified by opening up the top vent cover and access to the internal circuit board to detach any of the connectors and reattached it back, close back the top cover and power on the unit. You get back the AC3 signal delivered from your source but after a while you find that you had to perform the same task over and over again and finally it cannot worked anymore.

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I have similar problem, It ends up is a connector having cold joint. You have to open up the cover and solder all connector from the bottom of the pcb. After that, it will works for a long time.

Posted on Dec 02, 2009

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Posted on Jan 02, 2017

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Marantz a/v reciever sr-96 users manual i canot find it.


I found a partial copy, first 9 pages in pdf format. if you want it can email me here:
nasa.info@mail.com

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It's probably not heat due to the Marantz' large frame and heat-synchs.
This could simply be a mismatch of impedance. The amp is 120w per channel, so make sure the speakers can handle this. Check the impedance (ohms) of the speakers and the amp as well. Clipping can be caused by overpowering the speakers, which could damage the speakers in the long-run.
If this is only from 1 source- (i.e.- Blu-ray player or cable) then it could be digital clipping.. This Marantz can decode 96kHz PCM or normal Dolby Digital & DTS. If this is a Blu-ray it may be streaming 192kHz PCM... (but most likely the Marantz will not even attempt to play that audio)
I hope this helps.

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I have a panasonic SC-PT850 DVD home cinema system, and although it says it is DTS and Dolby 5.1 compatable but it does not give out any sound at all when i play Blueray films or Playstation 3 games which...


Not so much an answer more a shared problem with a slight insight. On the Panasonic manual page 40 http://www.panasonic.ae/EN/Manuals/SC-PT550%20-%20850W.pdf
It states the following: This unit can decode the surround signals received through cable TV box, digital broadcasting or satellite broadcasts. Refer to your equipment’s operating instructions for details. Only Dolby Digital and PCM can be played with this connection.
So it sounds like the SA-PT850 unit will decode DTS from an internal source ie DVD but not from an external source ie ps3 or WDTV which is a shame because I own a WDTV. The solution for me is to convert the dts to ac3 (Dolby digital) which works great. But not sure if this is an option for you.

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It is a preamplifier with sound processing which is sometimes referred to as pre pro... There is a simple solution to lack of DTS, the unit has 5 analog bypas inputs, bypass as they do not go through units Digital Signal Processing circuitry and DD processor.
If you have a DVD/BD player that has five (or more) analog outpusts you plug them in into your preamp and have the player decode DTS to analog signal. If the player has five analog outputs it mostly like has the on-board decoder. Other than this you can use a stand-analog DTS decoder in the same manner but it sounds like a cumbersome and costly alternative. Hope this helps.

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Hi Ron,

It sounds like the sub is not auto turning on, or has no audio output, and or the sub driver itself has failed. Do you have a multimeter, and we can diagnose the unit? :)

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First of all, Linear PCM is the best option to choose. PCM (Pulse Code Modulation) is a format for uncompressed raw audio data.

Some 5.1 sets have Dolby ProLogic II for example. The raw PCM output gets spread at your speakers dynamically. Meaning the decoder of your set interprets it the way it thinks is best. For example, if it gets a high frequency tone, it sends it to the center speakers as for human voice has a very high frequency. The center speaker is meant for dialogs.

But when you choose a compressed, encoded format such as Dolby or DTS the channel devidance is already mixed for you for optimal theatre experience.

When you choose DTS or Dolby in the menu of your Blu-ray Disc it will originally output a raw PCM audio stream. The decoder knows how to decode the DTS data out of it when you use the DTS audio track from the movie. The same goes for Dolby. Some movies can output pure PCM, but then most sets use ProLogic II to devide it over the speakers.
It's kinda hard to explain how it works, bottom line is.. there's nothing wrong.

I hope it makes sense to you and your question is answered.

Greetings,

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Is this only on some movies? Look to see in your options is you have and decoder settings. What audio format do you prefer, DTS or Dolby?
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hey... just reading the manual.. p28 "enjoying the sound effects" note says that "this machine is not equipped with dts digital surround decoder. when you select digital sound, sound is not output during playback disc with dts." not sure of the implications of this, but sounds like the problem you spoke of

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