Today's Message Index:
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1. 09:10 AM - Re: Various hackery (XDP-210EQ) (Ethan)
2. 08:11 PM - Re: Various hackery (XDP-210EQ) (Matt Dralle)
3. 09:01 PM - Re: Various hackery (XDP-210EQ) (Ethan)
4. 10:08 PM - Re: Various hackery (XDP-210EQ) (dralle@matronics.com (Matt Dralle))
Message 1
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| Subject: | Various hackery (XDP-210EQ) |
--> XDP4000X-List message posted by: Ethan <telmnstr@757.org>
> Yep I've noticed that from my CDX-T60 analog changer on some peaks on some
> discs. I'm going to (eventually, one day) get a pair of analog RCA
> attenuators from Parts Express. They sell them in various dB increments for
> fairly low cost. I'm thinking the 1dB ones will do fine as 3dB might be too
> much? Anyhow I think a pair of those will cure the problem. For me, what
Interesting, I will have to look into these.
> All analog-only changers and analog-only HUs have their firmware code
> permanently set to "ANALOG OUTPUT" mode which means whenever you switch to
> one of these sources on the UniLink bus the XDP will "expect" that the
> signal will be analog and disable the digital input(s).
Did you work for Sony or repair them? Are you positive they don't reuse
the master controller IC in multiple models, just leaving the digital
switch pin disconnected? This was my hope, to convert a analog only
changer like the CDX757MX (might be wrong model) to support digital output
without filtering the unilink bus data.
I really wish I could turn on digital input for the XT-40V too :-(
> Yeah I see where you are going with this--the CDX-757 is an MX changer,
> right? Meaning it can do MP3 playback? It can be done, yes I think so,
> particularly because that series of changer (828/838/727/737/etc.) is very
> closely related and are almost identical mechanically/physically. However,
> the thing I always wondered was about the MP3 support... Because MP3s would
> utilise an MP3 decoder/processor that digital information from the MP3s may
> never be accessible in S/PDIF PCM format on the board anywhere; furthermore
> it might not accompany the regular CD-Audio S/PDIF stream even if it were
> accessible meaning you'd only get digital output from CDs and not MP3s.
> It's worth a try though, if you have the time and resources because you
> might well get it to work.
I figure the table top mp3 capable cd players probably do S/PDIF .... I
guess it depends on how they implemented it.
> Yeah you'd just need to buy the 757 service manual and also the service
> manual for one of the same family digital out changers (828/838/848X would
> do) and you could probably figure it out. Unfortunately I've never seen any
> of those manuals online anywhere; so you might have to fork out the $10-$15
> each that Sony wants for them.
I've already got the changer manual fo the 828, via online. My friend
ordered some CDs from Russia full of Sony service manuals that probably
come from that online site open to repair techs. With any luck the XT40V
and 757MX manuals will be on there.
> There was no XA-C30D or XA-U30D... The XA-C30 was a dual purpose
> replacement for the XA-U20 and XA-U40 MCAs. The U20 had two UniLink ports
> on it (for attaching 2 changers to one HU) and the U40 had 4 (allowing 4
> changers). The C30 has three ports on it. The digital unit you are
> referring to is the XA-U40D and it is VERY rare and therefore carries a VERY
> high value with it if you ever do happen to find one.
Schematics would be good enough :-) The C30 uses relays?
> Converting a C30 into a digital unit wouldn't really be *that* hard (because
> all you'd need to do is access the relays that switch the audio ins and outs
> and connect a network of Toslink I/O to it) but it would require a fair bit
> of work and would probably be best to make it an external module of somesort
> added on to the unit instead of trying to remove all the RCAs on the board.
> The hardest part would just be making the Toslink network that is triggered
> by the relays in the analog MCA.
Actually, switching toslink ports would be dead easy. a 4 gang
optoisolator module, 4 toslink RX'ers and one Toslink TX'er and a few caps
should be all that is required.
> See my other reply for info on this. Not really useful--I've searched
> around for info to no avail. you might be more lucky though...
> Roland M.
I found the schematics on the site for this list, it appears to be tied
into Unilink somehow. Doh doh doh.
Message 2
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| Subject: | Various hackery (XDP-210EQ) |
--> XDP4000X-List message posted by: Matt Dralle <dralle@matronics.com>
>
>Actually, switching toslink ports would be dead easy. a 4 gang
>optoisolator module, 4 toslink RX'ers and one Toslink TX'er and a few caps
>should be all that is required.
>
> > See my other reply for info on this. Not really useful--I've searched
> > around for info to no avail. you might be more lucky though...
> > Roland M.
>
>I found the schematics on the site for this list, it appears to be tied
>into Unilink somehow. Doh doh doh.
Here's the link to my Toslink splitter/combiner. The reason I made this is
exactly the reason you're talking about. I wanted to switch between fiber
optic outputs and only had a C30 for the unilink part. Works great.
http://www.matronics.com/xdp-4000x/TOSLINK-Combiner-Splitter/TOSLINKCombiner-Splitter-Rev2.pdf
Matt Dralle
Matt G Dralle | Matronics | PO Box 347 | Livermore | CA | 94551
925-606-1001 V | 925-606-6281 F | dralle@matronics.com Email
http://www.matronics.com/ WWW | Featuring Products For Aircraft
Message 3
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| Subject: | Various hackery (XDP-210EQ) |
--> XDP4000X-List message posted by: Ethan <telmnstr@757.org>
> Here's the link to my Toslink splitter/combiner. The reason I made this is
> exactly the reason you're talking about. I wanted to switch between fiber
> optic outputs and only had a C30 for the unilink part. Works great.
> http://www.matronics.com/xdp-4000x/TOSLINK-Combiner-Splitter/TOSLINKCombiner-Splitter-Rev2.pdf
> Matt Dralle
Cool! I guess only the active changer actually outputs digital data.
I wish I could find schematics for the XT-40V, that would be interesting.
I wish there was a way to trigger the head unit optical in upon video1
input being selected.
Message 4
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"RE: XDP4000X-List: Various hackery (XDP-210EQ)" (Feb 8, 9:09pm)
| Subject: | Various hackery (XDP-210EQ) |
--> XDP4000X-List message posted by: dralle@matronics.com (Matt Dralle)
>--------------
>--> XDP4000X-List message posted by: Ethan <telmnstr@757.org>
>
>> Here's the link to my Toslink splitter/combiner. The reason I made this is
>> exactly the reason you're talking about. I wanted to switch between fiber
>> optic outputs and only had a C30 for the unilink part. Works great.
>> http://www.matronics.com/xdp-4000x/TOSLINK-Combiner-Splitter/TOSLINKCombiner-Splitter-Rev2.pdf
>> Matt Dralle
>
>Cool! I guess only the active changer actually outputs digital data.
>
Yes, any of the Sony car changers only output light when the changer
is actually playing. Otherwise, the LED output is turned off. This is
fortunate, since switching would be a lot harder, actually nearly
impossible without some active circuitry. BTW, this isn't the normal
mode-of-operation for most Toslink devices. For example, a normal
DVD player for home use doesn't turn off the LED output and there is
always carrier signal even if there isn't modulation.
>I wish I could find schematics for the XT-40V, that would be interesting.
>I wish there was a way to trigger the head unit optical in upon video1
>input being selected.
The head unit determins whether or not the slave supports digital output
by reading a particular data packet sequence sent when the Unilink
slave initilizes. It would be nearly impossible to hack the XT-40V to
send the "I do digital output" sequence instead of the "I do analog output"
sequence.
Unfortunately I don't have a service manual for the XT-40V, but here's
one for the XA-U40D just for fun:
http://www.matronics.com/xdp-4000x/XA-U40DServiceManual.pdf
Best Regards,
Matt Dralle
--
Matt G. Dralle | Matronics | P.O. Box 347 | Livermore | CA | 94551
925-606-1001 Voice | 925-606-6281 FAX | dralle@matronics.com Email
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