I wondered that too, but there’s just not much out on the net written about this particular model. I did find a service manual, but I don’t know much about digital circuits beyond there’s a series of DC pulses.
If it were something you wanted to do you would start by identifying witch micro chip is the dac then probe the digital input pins with a scope to verify it is the digital signal.
Most likely that could be feed directly to a dac of. Your choosing but you might also want to add some level of isolation.
I still need to investigate fixing the Marantz Pro player I have. Mechanism is slick, no grease issues, no teeth missing on the gears. Plays fine when drawer is in position. It seems the limits may be out as it thinks it is shut or open, and needs help to get there.
I’m no repair man, but if it’s doable, I’d like to. It’s a lot like this one on ebay.
Wolf, chances are it uses an opetical sensor to know when the tray is closed. post lots of pics of the internals and I will try to help identify the mecanisma and develop a repair.
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The digital out mod got my gears turning to do a little research.
It seems some brands had higher models that did have digital outs, so the capability was still there but parts were just left off the board:
If that was not the case with a model.. seems to get out in the weeds pretty quick chasing down clocks and whatnot.
I’m not finding much info regarding my CDP-391. But the case is pretty vacant with the PCB against the front panel:
https://www.leboncoin.fr/ad/photo_audio_video/2912900701
So much room for activities that I found someone added a tube buffer 
?!?
Though the TDA1543A was a standard 8-pin format, which might make things easier to figure out:
Though that converter may not work since the TDA1543A uses “24-bit right-justified” format. As opposed to the non “A” model chip’s standard I2S format. Quickly going way over my head.
I have a matching tuner and amplifier. Cool stuff.
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I’ve been moving a lot of gear around this weekend in the man-cave and storage room. I decided to put my old Parasound preamp back into service. These came out in ‘95, so I guess it qualifies as vintage. I plugged it in and it sounded like the main L&R channels were playing the surround signal. To the bench it goes! I expected to find a scrambled processor chip, but I got bursts of normal stereo just moving it around on the bench. Turns out the RCA jacks for the Line In and Front Out both had sheared ground pins. That was creating an unintentional Hafler surround circuit. 28 screws and a little soldering - it’s fixed and sounds great again.
I only found the actual problem when I noticed the ground pin was floating around when I reflowed the solder connections.
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Good job Tom! One thing I have found helps with longevity, clean ALL the flux off the board. I use 99% IPA. There are some cleaners made specifically for flux that works even better but it is a bit pricey.
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Just got my first XPA2001 and they sent me the 70V version 
Not what I ordered. Seller accknowleged the mistake and sent a return shipping label.
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Not a recent find, but a sweet old school VCR nonetheless. VHS upscaled to 4K is not the greatest viewing experience however.
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Sorry about the dust lol.
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I’m getting to the age where I’m finally letting some of my vintage gear go. My buddy TJ had been dropping hints that he wanted first dibs on the JBL L112s that have been taking up space in my listening room for years. He’s found some great pieces for me and I know he’ll give the JBLs a good home, so I let them go for a bargain price.
Plus, these turned out to be a decent investment. Paid $75 for them and got 10x that after 19 years. Everybody wins!
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I picked up a nice old Hafler DH-220 yesterday. It showed up on ShopGoodwill at our local store and I couldn’t resist. I’ve always wanted to see/hear what all the hype was about with these amps. I wouldn’t say it was a super deal, but much better than what you pay on eBay. It just needed a new power switch. The Nichicon caps on the boards are dated 1981. I think the RCAs may have been upgraded, but other than that it looks original and clean inside.
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Unfortunately, our Oz thrift stores like Savers, Salvation Army etc are hopeless for finding this sort of gear: most refuse to take electrical goods due to safety concerns and I’ve never seen any decent speakers; you guys are lucky! A few stores deal in vintage hi fi gear but with few exceptions their stuff is relatively expensive, e.g. $400 for a 18 watt Pioneer 70s receiver.
Our old Technics 5CD player has a sticky drawer which you have to nudge to close, so I’ll try the above ideas to see if I can fix it (again).
Geoff
There’s nothing but plastic junk at our local Goodwill and Salvation Army stores. We have two vintage shops that sell vinyl, retro clothes, and vintage audio components. The owners of those two shops must follow the market as they both ask market value or much more for their goods. I’m not interested enough to deal with them. I still look at my local craigslist weekly, you never know when you could strike gold.
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I keep wandering in random Goodwill’s hoping something like that will happen…never has…
Went in one today…junk.
Can’t say anything bad about my DH200👍🏻
Looks like someone already swapped the RCAs. Luck dog you!!
We don’t have Craigslist here, just Gumtree, EBay and Facebook marketplace. There are some dodgy operators on them and I haven’t seen any good finds anyway. For stereo gear, there’s www.stereonet.au, but as there’s not a big market here for DIY and hi-fi, there’s not much on there either although I’ve sold some stuff.
Geoff
I just got a killer deal on 2 new REL subs a few weeks ago. It pays to keep on eye on the Facebook marketplace. Got 2 new HT 12” subs for the price of one! Guy bought 6, used 4 and sold 2 used ones and 2 new ones. Pretty damn happy with them too.
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