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kgallen

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Everything posted by kgallen

  1. Great thanks. Feels a bit like a software issue rather than hardware though. I could well be wrong. Come back to us with any more info you learn and we’ll continue to brainstorm it with you.
  2. That's computers for you. They drive you potty! Still things look like they are going in roughly the right direction. For inexplicable reasons of course!
  3. Just to check: when the audio stops after 30 minutes is the unit still operational just without audio? 1) you can eject and insert discs and the NT1 will read and ‘play’ but there is no audio or 2) the unit powers and will take a disc but there are disc read errors or 3) the unit is unresponsive from front panel and/or PC or 4) something else
  4. Ah your adapter is a SMPSU. Output should be notionally 9V for the input voltage range. Scratch that then!
  5. Yes @sfbp is somewhat correct. There are a number of linear regulators in the power supply that will dissipate power proportional to the voltage drop across them ie input voltage minus output voltage. However from what I recall there was a switched mode regulator to 5V which would be more immune to a higher input voltage with respect to power dissipation. Upshot is I expect there will be slightly more heat dissipation as a result. However I wouldn’t expect this to cause an issue, unless the ambient temperature in your location is very high (say above 40degC, don’t know what that is in old money sorry!). But none-the-less the info on timescales is interesting…
  6. Thanks Rich, I am comforted. They are pretty discs. Since mine are NOS they haven’t been abused, so I’ll look after them. 🙂
  7. I think the signal path for both is the same - through the ADC, into the DSP, loop back out of the DSP, through the DAC. Delete ADC and/or DAC if using digital I/O. So this includes going through (at least part of) the DSP. Whether or not this includes the Copy Bit reassignment logic is the question. Results from your experiment suggest not. Service Manuals tend to not include a detailed block diagram of the DSP chip - which we must remember since CXD2654 (ATRAC 4.5) - includes pretty much all of the digital audio chain in one chip - sample rate converter, shock memory, ATRAC enc/dec, ACIRC error correction enc/dec, EFM enc/dec, plus servo control. These functions were largely in separate ICs if we go back to the first machines, even one chip per stereo channel in the case of ATRAC. Minidisc is not like a 3-head cassette deck. When recording, what you’re hearing/monitoring is not being read back from the disc. Indeed the disc writing will somewhat lag the real time audio due to the encode/decode process latency and the buffer/shock memory.
  8. Just found this photo on my phone. Darn it, you’re right - plastic shutter! (No idea why this photo is rotated, it was the correct way up on my phone!). Wanders off to cry into his pillow...
  9. Eeeek! I'm pretty sure my Maxell Color are metal shutters, but you have me worried now! My open/recorded ones are all at the office, so I'll have to check tomorrow.
  10. One other check - the lithium battery, BT420, and that the link, CN420, is in place (and not dropped off). I can't find the battery listed on the parts list, but in the other decks it is a Panasonic ML2020. If this is dead then maybe the NT1 looses config information which means the USB driver doesn't detect it properly. Just guessin' (no 'g'...). Just saw the comment above about a "heater". Not sure what the heck this is. Not in this machine! (And I certainly wouldn't describe the laser in record mode as a "heater"!).
  11. Hmmm, if anything from your reports it feels a bit like it could be a hardware reset problem. Looking at the schematics, and I've not seen this in the "normal" decks, is there is a dedicated reset chip, IC420 with cap C420, 330nF. However capacitors don't gain capacitance over time, their capacitive abilities deteriorate. Anyway at 330nF, this is likely to be a ceramic or similar type of cap, and they are stable and last forever (unless physically abused) as there is no electrolyte to dry out or deteriorate. Otherwise this is superficially a fairly straightforward unit. Most of the audio path is on the MD drive, which looks a lot like an MDM7S1A using CXD2664 Type-S DSP (SM says it's an MDM7S2B which must be the next iteration). The DAC is unremarkable and there is no ADC (no analogue record path). The power supply is very straightforward in comparison to most decks and the USB/NET functionality is wrapped up in a single chip with virtually nothing external. All that's left is the microcontroller, again very little external. What is there, two buttons and 3 LEDs on this thing? If I was inside I would check the power supply voltages, the reset generator, then I'm struggling a bit. Maybe 12MHz clock on the USB chip and 10MHz on the uC. Then I'd be suspecting the USB really, and quite possibly the PC end or driver issues. There is nothing much inside here to look at USB-wise as it's all wrapped up in IC901 (CXD1873). USB doesn't supply power although the USB VDD is sensed by the microcontroller via D901 and the potential divider of R904/R903 which will give (5-0.6)*47/(47+22)=3V on IC301 pin 77 when USB is connected. Sorry, that's all she wrote. If you have any more observations on behaviour, post 'em here.
  12. No idea, sorry. The current diagnosis is too vague to pinpoint such a component. I will at some point see if there are schematics but I'll be stabbing in the dark. 5 hours is a very long time for any sensible RC time constant!
  13. Were you using monitor mode? I'm kinda surprised that the Copy Bit setting doesn't affect that, although I guess in reality I'm not that surprised as I guess they wouldn't want to make SCMS defeat too easy. I suspect even having this function on these decks was somewhat a compromise from the RIAA... I suspect actual recording will be the same behaviour as monitor mode. But I'm just as likely wrong...!
  14. Now indeed that does sound like a capacitor! Although a rather large one with those timescales!
  15. I think when you have a collection of rack gear collected together in a rack then i agree I think it looks good in its own way (One lonely rack mount piece of gear does look a bit sad though!) Not ‘front room pretty’ though like the consumer decks! I’m in two minds about juggling a few bits of the case now with this one since at least for now it’s working perfectly. I have a better top lid I can use. And in my OCD I’d also like to match up the case serial number with the main board - since really that is the correct combination re lineage. My working E10 has the main board from another deck so the serial number doesn’t match the heart of the deck. Just my OCD though! E10 and E12 prices are silly at the moment. The messy E12 I bought was just at a level it was worth the punt for a broken unit, but I could easily have come off badly and I might yet come unstuck if the over-voltage event did deeper damage to the reliability. The drive from that unit won’t write so I don’t have a fully working MDM7SC drive spare.
  16. Those budget ones look like they have metal shutters. The Sharp one that arrived inside my recent E12 has a plastic shutter. I’m not keen on those at all (reliability wise - looks like a disc jam waiting to happen…).
  17. Edit: Just looked at the SM, this machine has very little I/O, we might struggle. @sfbp is good with this sort of ‘software’ machine. Much of what I wrote below is irrelevant with this machine. Hi Aaron. So this sounds like an audio path issue rather than a disc read/write issue as such since the disc seems to have good TOC information. Do the VU meters show anything during record or play? If you go into monitor mode (eject disc then press record) do you get any output from either the phono sockets or headphone socket? What about input/output using coax or TOSLINK, can you get any audio in either direction there? Ie known good disc played on the NT1 or disc recorded on the NT1 via TOSLINK or coax rather than analogue.
  18. Hi Aaron, Welcome. Could be a number of issues. Firstly, if you are recording LP2 or LP4 then the playback machine also needs to support MDLP (so decks MDS-x40 and later). If you play back an LP2/4 track on an SP only machine then you will get silence. When you say no sound, I think you're saying there is a track recorded, it's just there is no audio - I'm wanting to rule out an overwrite head issue. If the OWH is broken then the disc will get corrupted, since the laser will erase data but there is no new data recorded. The TOC can get corrupted in this way which makes the disc, or parts of the disc corrupt (usually this disc can be recovered by erasing the problem tracks or doing a title modification and thus rewriting part of the TOC). First steps, can you record a track on a known good machine, and then does this play back on the NT1? If there is really "just one capacitor" that fixes this then we'd be pleased to know (personally, I'm sceptical but happy to be proven wrong!). Kevin
  19. To reiterate here what I found and documented on the SCMS thread: "non-PRO" E10/E12 don't care about SCMS on the input SPDIF/TOSLINK. However they have no way to configure the copy bits on the recording, so the tracks have the same copy bits as the source, i.e. if the incoming signal is Copy Prohibit, then the recorded track is Copy Prohibit too. Note: I don't know what comes out on the output TOSLINK/SPDIF - I suspect the same as the source. The "PRO" versions of these decks allow you to set the recorded copy bits, e.g. the source has Copy Prohibit but you could make the recording Copy Permit or Copy PreRecorded. Again, I don't know what comes out on the output TOSLINK/SPDIF, could be as source or as recorded. That would be an experiment for another day!
  20. Yea we all went back to Newbie! And it takes some fair old work to get up the ranks. I’m only a little ahead because Christopher bumped me on my MD-CD1 post a couple of weeks back. Glad to see you back on here John! Tell us what you’ve been up to with your 470’s (not a model seen about much). Stick something on the ‘This week I’ve been…’ thread if you don’t think you have anything juicy enough for it’s own thread.
  21. I now have a ‘non-PRO’ MDS-E12. i.e. the startup says ‘MDS-E12’ not ‘MDS-E12 PRO’. This machine does *not* have the Copy Bit option in the Setup Menu. However it does (already) have the updated SCMS resistor configuration shown in the SM Supplement. I was intrigued to know how it handled, or didn’t handle SCMS. On one of my PRO MDS-E12 I recorded a track with Copy Bit=Inhibit. I *was* able to record this track from the PRO onto the non-PRO E12 via SPDIF. I took the two discs and tried to copy both the original track and the copied track from my MDS-JE770 to my MDS-JE530 via TOSLINK. For both tracks, the 530 reported ‘Cannot Copy’. Conclusion: A ‘non-PRO’ E12 ignores incoming copy bits regarding SCMS copy control. The copied track appears to have the same copy bit settings as the source track. The former is welcome to know. The latter is expected since the ‘non-PRO’ machines don’t have the menu item to configure the recorded copy bits. I would expect a ‘non-PRO’ E10 to have the same behaviour, but I don’t have a working one to confirm this.
  22. Haha thought that might be the case! Happy to be in good company!
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