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kgallen

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Everything posted by kgallen

  1. Agree. Doesn't look like a Sony chip. For start it seems to have the DAC and ADC on-chip. Sony seem to prefer external devices. I looked at the Sony CXD2654 (JE520, 1998), CXD2656 (JE530, 1999) and CXD2662 (JE440, 2000) and the pinout is nothing like. The Sony chips are very similar pinouts but nothing like the Technics/Panasonic device. So at best maybe ATRAC1 v4.5 Type R.
  2. Indeed. Here it is. I think 980 is the same PCB set as 480, referenced below. Check the dimensions on your own machine though. These ribbons seem quite robust, so unless they've been really abused I'd expect them to be ok. Oxidation of the exposed fingers is what we've generally found.
  3. 20 years production of (Sony) machines I think, 1993-2013. Tascam MD-CD1Mk3 could be bought new in Europe ‘til late 2017. Any others?
  4. I think he's probably bang on what he thinks the source of them is. Shame that pile were such a load of junk. However to hark back to his first minidisc video, the range of machine designs is huge even across, just the 5 manufacturers he had here. Of that load of 58 was it - other than a few that looked like colour variants of a model, there must have easily been 40 different designs.
  5. Short on time? I'm watching the full one AGAIN! So what does that tell you... oh yea, I did watch the short one a little while ago too, that was fun, but I'm glad I watched the long one first!
  6. 45 mins in, that chunky Sharp machine. Recon he's got an 80 minute Sony disc there, which has a finer track pitch. Very original minidiscs were 60 and 74 minutes and the track pitch is wider. It played his MD-CD disc ok. Wadaya recon?
  7. 39mins, we have a winner!!!!
  8. I'm going in... for the full whack 73 minute mega version! Deep breath... So given he has all of those remotes etc, might need to standby on eBay to see if anything turns up. I could be up for a couple of decent portables remotes...
  9. I think I'd be looking at the Standby issue for clues why it's not coming on. Some wire/cable disturbed when the drive was removed etc.
  10. Explain to me again where we are with the Standby condition...
  11. With the components in-circuit you'd have to be very careless with e.g. bare ends of ribbon cables or deliberately rubbing your hands across the PCB after scrubbing your nylon clothes with a cotton duster. Out of circuit it's much easier to damage CMOS devices. In the industry we use the ESD Human Body Model as one means to characterise the device in this respect.
  12. It is I agree. On the negative side it's annoying having a great machine out of service, particularly if it's your only one. On the plus side, look how much you're learning about your machine! Still keep looking for those 'obvious' / 'simple' explanations though. One rubber belt change can't kill a fully working machine! If there's anything we've learned on this forum in recent times, these machines are well designed with quality components and rigorous manufacturing and test processes. It's tended to be something daft in the end...
  13. From the data sheet for the chip I’d agree the amplitude should be somewhat nearer 3V. But at the level shown in your scope I’d be surprised if this is a fault given the way the circuit is configured. If you’re measuring at IC201 then the clock does have the series termination 100R and ferrite bead in the way.
  14. Edited my previous post a bit. In summary I'm not sure I see strong evidence that IC803 is faulty, sorry.
  15. Don't necessarily agree. That chip supports a directly connected crystal across the XIN/XOUT pins. The crystal is excited by a lower amplitude sine wave than the usual digital levels. In this application they haven't used a directly-connected crystal, they are sourcing the clock from elsewhere. The clock they have sourced is probably a full-swing digital signal, and they don't want this for XIN so they've ac coupled it with capacitor C899. -> I suspect this is as intended. Hmmm. There are a few different datasheets about but none of them are particularly comprehensive. From the CLKSEL and FS[1:0] settings looks like the input clock should be 11.2896MHz and the output 90.3168MHz. It's not stated but it would seem reasonable that the CLKA output swings to the rails of the chip supply, which is stated as 3.3V typical. However there are some voltages annotated around that chip and it doesn't look like 3.3V on CLKA, more like 1.5V. Can you clarify on your document? OK just found the SM, it says 1.7V at IC803 pin5, even though the chip supply is 3.3V. From your top oscilloscope trace, it looks ok-ish to me (at 1V/div) - it's maybe 1.5V pk-pk on your scope but you are approaching the limits of that scope - 90.3168MHz on a 100MHz BW scope. Also the probe cap is probably 20pF on top of the input pin cap and that chip has a CLOAD(max) of 15pF. Also I note the input the clock is driving, IC201 pin 20 OSCO. This chip also seems to support an external crystal on pins 19 and 20. It's likely it's ok with a low-swing clock signal on pin 20 as there will likely be a Schmitt-trigger stage internally to square-up and level shift the crystal resonance to the correct digital levels of 3.3V. -> I would still conclude IC803 is ok. But I do concede the SM seems a bit inconsistent between the schematic, the waveform page and possibly the chip datasheet.
  16. I found these too: 1. The PressIT labels are mentioned on minidisc.org I found this live website listing them and it seems you can buy them at £3.75 per pack of 5 A4 sheets (inkjet and laser) which totals 60 labels each for MD and spine. Can't see any other details though, like label size. Blurb says 12 MD labels and 12 spine labels (doesn't seem many for an A4 sheet!): https://www.rpadistribution.co.uk/Items/120.htm ...however I did try to "Add to Basket" and it went to a duff page. There is a London phone number: 020 3183 0000. 2. Avery Vinyl labels Having a bit of a google, using vinyl labels is suggested, e.g. Avery 22828 which are 1 3/4" x 1 1/4" (45mm x 32mm). Inkjet and laser compatible it says. https://www.amazon.co.uk/Avery-Removable-Durable-Rectangular-22828/dp/B009KLXQJW/ref=sr_1_1?dchild=1&keywords=avery+22828&qid=1590005694&sr=8-1 found here in a later comment (active thread in the past couple of days!): Digging a bit more, there seems to be quite an active MD following on reddit. Just been following a few threads!
  17. If I just consider the "full size" label, which occupies the left half of the top of an MO disc: Across a range of Sony, TDK and Maxell discs, this label seems a pretty consistent 52mm H x 35mm W. The mould depression in the disc typically gives a 1mm margin on all sides (so 54mm x 37mm). I know these are "address labels", not "proper" MD labels... On eBay I can find 50x36 labels, 32 per A4 sheet, e.g.: https://www.ebay.co.uk/itm/White-A4-Laser-Printer-Copier-Inkjet-Sheets-Sticky-Self-Adhesive-Address-Labels/171028860767?hash=item27d21d4f5f:m:mjtNPA7UGsdZ-UFtQVqDl9A 52x30 (taller, narrower): https://www.ebay.co.uk/itm/A4-Address-Labels-All-Sizes-Sticky-Self-Adhesive-Sheets-for-Inkjet-Laser/252590025184?hash=item3acf89e9e0:m:mWZpvtpnodG7bQ6q_qkV8qg
  18. Good. With a disc in, WP should show the state of the movable flag that is used to indicate a write protected disc - the little white slider in the corner of the disc case. When writeable (slider covering the hole) then I'd expect WP=0V, when write protected (hole is open) then 3.3V. REFL is the disc reflectivity. With a recordable MO disc then the REFL hole is open so I'd expect 3.3V. If you have a pressed MD-CD disc then the hole is blocked so expect 0V. The REFL hole is next to the WP hole in the MD disc case. OUT switch should show (probably) 3.3V with a disc out and 0V with a disc in. (The state should be different with a disc in compared to a disc out.). This is possibly the most interesting one given our issue. The switch is burried so it's hard to see. But having this one change state between disc out and disc inserted is obviously important!
  19. Hi, I found this depends whether you have any clean air aerosol and want to take the top off. https://www.fixya.com/support/t598945-technics_sj_hd501_minidisc_player_will Given this was a working machine I’d expect something simple like dust or a hair (as we found on another thread) so I wouldn’t suggest pulling the machine about a lot.
  20. Work it a little bit, inserting and ejecting the disc. It might just be a little bit sticky with inaction.
  21. I thought these things were supposed to conform to the various orange/red/yellow-book standards for CDs. This is one - of many - reasons I moved away from CD back to MD for my theatre work. The number of hassles I had with CD machines not reading the text ever/always/corrupt, let alone CD-Rs being hit and miss, with both domestic and professional CD machines. No such nonsense with MD, it just works, always. Not sure why it took me so long to return (spare cash probably! - actually that's why I've got my MDS-JE530 which was a cheapy, except it didn't work... and you all know the rest!).
  22. Good news! I think there are 3 switches - WP, REFL, LIMIT and OUT. All of these should be probe-able on the ribbon cable at the main PCB end for convenience. All are resistively pulled up to 3.3V and when the contacts are closed are shorted to 0V. WP and REFL are tiny blue/white pins that detect holes/depressions in the MD disc case. LIMIT and OUT are part of the drive mechanism, but are harder to get at as they are burried between the drive PCB and the mechanics. However given that in SM you can insert a disc, the OUT should be able to toggle. If you can move the sled in SM then LIMIT should be able to toggle (disc outer edge limit I think). Frustrating we still can't nail this. Did you do any visual inspection?
  23. Each of our homes must look like a branch of Richer Sounds from the late 90's-2000s. I remember my younger days going around the specialist hi-fi shops (in the UK midlands and north, with the very occasional trip down to Tottenham Court Road in London for an eye-boggling feast). Pretty much all of the products were well out of my price range! Some must still exist, but it's not the sort of shop I see around these days. Has everyone gone off "proper" hi-fi? I remember around 1990 visiting one such independent shop in our local town to buy a pair of "proper" headphones. There was one pair I could afford - some Sennheiser HD 40s. I still have them now. Not quite Trigger's Broom - all original and I think only one replacement set of ear pads. Grey ones now as I couldn't ever find a yellow pair to match the originals. They are currently plugged into my oft-mentioned MDS-JE530 :-)
  24. I've tried the odd CD-R in the car which has a Sony CD with CD-TEXT. That behaves different again from what I recall. I should do a more "scientific" study. The reason I haven't really is the CD-Rs that I'm recording and dubbing are sound effects for theatre shows rather than music you'd have in the car. This means there can be a lot of short tracks and sometimes the titles can be a little longer than those you might have for typical music. I'm still of the mind that the Tascam MD-CD1 firmware is full of bugs and this is the main cause. But whatever titles it seems to collect from the CD-R end up on the MD. I'm not fully convinced of iTunes either, so it's interesting to hear you have success. The iTunes version I have is generally pretty much up to date on a Win10 machine, although I tend not to update it when I'm preparing material for a show (which isn't happening at the moment of course). I've recently acquired a Sony CDP-XE530 CD player with CD-TEXT. It also has an S-Link A1 interface, so I could hook that up to my (still :-D) working MDS-JE530 which has an S-Link A1II interface. This should allow me to dub a CD-R to MD with the titles, using Sony machines - although I'll have to do it in real time rather than the Tascam's 4x... (ETA: Found this SIF thread on using Control-A1 link between CD-TEXT CD and MD deck to support title copying, so hoping this should work...) Might have a play tonight (if I can get away from "day" work...) ETA: Glad I found that SIF thread! Happy to report that my Sony CDP-XE530 (Control A1) will copy CD-TEXT across to my MDS-JE530 (Control A1II) - track and disc title. This is from an SFX CD-R mastered with iTunes. Per that article, the text copy does only happen when using the CD-SYNC function though, not otherwise, even if the CD/MD are sync'd up such that the CD starts when the MD is started from record-pause. I used an RM-D15M remote - the larger one that comes with the MDS-JE520 (the MDS-JE530 came with a narrower one) which has the CD SYNC section buttons at the bottom. At some point I'll do an A-B comparison to check that the Sony pair have copied the track names correctly and to see if the Tascam MD-CD1 does or doesn't. Thanks for the nudge @BearBoy :-D ETA2: Text copied correctly by Tascam MD-CD1 too with this CD-R (SFX for Around the World in 80 Days). Need to try a different one! Wishing you well! ps Sorry for polluting this thread.
  25. Hooked son... Would like MD player... eBay salvaged MZ-N510 incoming... Not working -> needs fixing... Standby forum... (It's quiet around here today...)
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