fourbanks Posted September 9, 2015 Report Share Posted September 9, 2015 (edited) Hi friends I have just noticed on my new Sony MDS-JB 940 Static Mini Disc Player that on inserting the disk it says reading TOC and plays well . however on ejecting the disc it says eject then goes straight to the message reading TOC without ejecting The unit has only been used once before storage many years ago. hopefully i will be able to fix it as our good friend Jim is no longer here ? Edited September 9, 2015 by fourbanks Quote Link to comment Share on other sites More sharing options...
sfbp Posted September 10, 2015 Report Share Posted September 10, 2015 New belthttp://www.ebay.com/itm/Sony-Riemen-belts-MDS-JE440-MDS-JE640-CAS-/400427074241You can change it yourself easily.Stephen Quote Link to comment Share on other sites More sharing options...
Sphig Posted September 10, 2015 Report Share Posted September 10, 2015 100% firm suggestion on belt Quote Link to comment Share on other sites More sharing options...
fourbanks Posted September 10, 2015 Author Report Share Posted September 10, 2015 (edited) New belthttp://www.ebay.com/itm/Sony-Riemen-belts-MDS-JE440-MDS-JE640-CAS-/400427074241You can change it yourself easily.StephenThanks Stephen Edited September 10, 2015 by fourbanks Quote Link to comment Share on other sites More sharing options...
fourbanks Posted September 10, 2015 Author Report Share Posted September 10, 2015 100% firm suggestion on beltthank you Quote Link to comment Share on other sites More sharing options...
fourbanks Posted September 16, 2015 Author Report Share Posted September 16, 2015 I have received the belt from Holland i never realized how small it was ? it is straight forward to fit ? Quote Link to comment Share on other sites More sharing options...
sfbp Posted September 17, 2015 Report Share Posted September 17, 2015 Dead easy. Just make sure you don't leave the belt twisted if it ends up that way after you first put it on.If I recall correctly, this is roughly the sequence1. Remove lid.(EDIT) If there is any disk in the unit, persuade it very gently to come out, using whatever tools you have to do the work of the belt that's not working (i.e. push the eject button and "help" it to eject). Probably easiest with the power on. (EDIT)2. disconnect ribbon cables making sure you know where they go back (it should be obvious) leading to the mainboard from the MD unit. ONLY DISCONNECT ONE END OF EACH.3. Undo the grounding straps (they are push fit), I think there are only 2 you care about, making sure you know where they came from.4. Remove/loosen the front panel (6 screws or so), only enough to remove the MD unit. See the service manual. If you're smart you won't completely undo it.5. Undo the 4 "flying saucer" screws anchoring the MD unit into its rubber bushings.6. Now you can take the MD unit into your hand with no wires or anything. Prise the plastic mechanism by squeezing just enough to let it open past the (plastic) stop and open the main hinge very very carefully making sure not to bend or stretch anything particularly the overwrite head. You should be able to replace the belt now.Putting it back together is easy. The service manual shows it all (the DISassembly of course). Nota bene: you should not have to disassemble the MD unit itself. Particularly if you get to something that says "remove solder" stop immediately and reconsider your fate.Good luckStephen Quote Link to comment Share on other sites More sharing options...
Azureal Posted September 17, 2015 Report Share Posted September 17, 2015 Snap a couple of pictures of the unit internals before you disassemble to use for reassembly. 1 Quote Link to comment Share on other sites More sharing options...
fourbanks Posted September 17, 2015 Author Report Share Posted September 17, 2015 Thank you both for your guidance which is very much appreciated Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 16, 2015 Author Report Share Posted October 16, 2015 i still have this work to do but will get round to it. if i need to eject the disc i just have to put some pressure in the opening and it ejects but as i say i'll get round to it Quote Link to comment Share on other sites More sharing options...
sfbp Posted October 17, 2015 Report Share Posted October 17, 2015 Be careful you don't wait. It will eventually jam and you will be sorry... very sorry. Quote Link to comment Share on other sites More sharing options...
freddyjollo Posted October 20, 2015 Report Share Posted October 20, 2015 well well well. I thought I would check my store of mindisck decks jb940 and one also now shows the same problem! Does time deteriorate the belt esp when not in use or maybe the storeage conditions? This is the first time this has happened to me. is it common? as it was fine when stored away and never gave any trouble of any kind. By the way where is the service manual referred to above as it seems I will have to do the same job!! Quote Link to comment Share on other sites More sharing options...
freddyjollo Posted October 20, 2015 Report Share Posted October 20, 2015 (edited) well I started to dismantle mine. it is nt necessary to undo the front at all as once the saucer screws are undone it lifts out clean. re the grounding straps - cant see any. Now just got to get to the belt, the instructions above a bit un clear. I can see the little belt from the front? only one belt? What should I expect to see? a broken belt? Mine is still intact and in place.Just slipping then? and a new one will do the job? Edited October 20, 2015 by freddyjollo Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 20, 2015 Author Report Share Posted October 20, 2015 well I started to dismantle mine. it is nt necessary to undo the front at all as once the saucer screws are undone it lifts out clean. re the grounding straps - cant see any. Now just got to get to the belt, the instructions above a bit un clear. I can see the little belt from the front? only one belt? What should I expect to see? a broken belt? Mine is still intact and in place.Just slipping then? and a new one will do the job?Mine is still intact and in place.Just slipping then? and a new one will do the job?hopefully freddy that is all it will be ? Quote Link to comment Share on other sites More sharing options...
freddyjollo Posted October 21, 2015 Report Share Posted October 21, 2015 fourbanks have u sorted yours out yet? did the belt solve the problem? Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 21, 2015 Author Report Share Posted October 21, 2015 fourbanks have u sorted yours out yet? did the belt solve the problem?no freddy like you i'm looking at it but i'm sure it will be not to difficult Quote Link to comment Share on other sites More sharing options...
freddyjollo Posted October 21, 2015 Report Share Posted October 21, 2015 to open the "main hinge" I think you have to remove a small spring at the side that otherwise keeps it closed. This is a very small spring with not too much tension that I think could easily be damaged so do with care. I havent got to that state yet, as I am waiting for a spare belt to arrive. Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 21, 2015 Author Report Share Posted October 21, 2015 to open the "main hinge" I think you have to remove a small spring at the side that otherwise keeps it closed. This is a very small spring with not too much tension that I think could easily be damaged so do with care. I havent got to that state yet, as I am waiting for a spare belt to arrive.i will follow your lead we can do this together when your new belt arrives Quote Link to comment Share on other sites More sharing options...
sfbp Posted October 21, 2015 Report Share Posted October 21, 2015 to open the "main hinge" I think you have to remove a small spring at the side that otherwise keeps it closed. This is a very small spring with not too much tension that I think could easily be damaged so do with care. I havent got to that state yet, as I am waiting for a spare belt to arrive.The spring is no big deal, but you may want to remove it early just to make sure it doesn't get bent out of shape (it's easy enough to bend back). The belt, on the other hand can slip quite easily and no amount of adjusting springs etc. will make any difference to the mechanism functioning properly. Quote Link to comment Share on other sites More sharing options...
freddyjollo Posted October 22, 2015 Report Share Posted October 22, 2015 on a related matter do any of the cheaper Sony decks use the same transport? might be worth picking up one cheap just for the mechanism? Quote Link to comment Share on other sites More sharing options...
sfbp Posted October 22, 2015 Report Share Posted October 22, 2015 A lot of the decks around that time use the same mechanism. However there are different cable widths (17,19,21,23 pins on the principal cable from MD to mainboard). So one must check AT LEAST that the 2 cables have the same number of pins. It has to do with the extra control lines related to M-Crew/NetMD support (remote), IIRC. Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 22, 2015 Author Report Share Posted October 22, 2015 (edited) i'm afraid this did not go well as the piece of the laser broke off so if possible will need to put the rest of this unit into a old 920 uk model like the lighting unit ? and the belt i have just brought ?i have a tv electronic engineer who works close by so he may be able to swap some of the parts over ? Edited October 22, 2015 by fourbanks Quote Link to comment Share on other sites More sharing options...
sfbp Posted October 22, 2015 Report Share Posted October 22, 2015 Can you take a picture? Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 22, 2015 Author Report Share Posted October 22, 2015 Can you take a picture?i have dropped the units over at the at the engineers so i'll leave it up to him as the best way forward. the laser unit of the old 920 did work but has been heavily used. He might just swap that over but failing that he will if able just swap the main light unit over as it's new and will just keep all parts for a later date these things happen and if i came across the same model will get another this was just bad luckwill keep you posted Quote Link to comment Share on other sites More sharing options...
sfbp Posted October 22, 2015 Report Share Posted October 22, 2015 You cannot put the 920 disk unit into the the 940. Sorry. Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 22, 2015 Author Report Share Posted October 22, 2015 (edited) You cannot put the 920 disk unit into the the 940. Sorry.Hi Stephenwill we be able to put the 940 display unit into the 920 ? making it look like new ? Edited October 22, 2015 by fourbanks Quote Link to comment Share on other sites More sharing options...
sfbp Posted October 22, 2015 Report Share Posted October 22, 2015 Unlikely. The 920 doesn't support MDLP, but the 940 display has all kinds of stuff to do with that hardwired into the display. Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 22, 2015 Author Report Share Posted October 22, 2015 (edited) Unlikely. The 920 doesn't support MDLP, but the 940 display has all kinds of stuff to do with that hardwired into the display.is the SONY MDS-JB930 QS a step up to the JB 920QS or the equivalent to the 940 ? do you know Also Sony MDS-JB730 QS Black High-End Minidisc Deck what is this machine like ? http://www.ebay.co.uk/itm/Sony-MDS-JB730-QS-Black-High-End-Minidisc-Deck-MINT-Condition-/181882628629?hash=item2a590caa15:g:wjcAAOSw9r1WBTVI Edited October 22, 2015 by fourbanks Quote Link to comment Share on other sites More sharing options...
sfbp Posted October 22, 2015 Report Share Posted October 22, 2015 None of the x30 decks support MDLP.http://minidisc.org/part_Sony_MDS-JB730.html Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 22, 2015 Author Report Share Posted October 22, 2015 None of the x30 decks support MDLP.http://minidisc.org/part_Sony_MDS-JB730.htmli will have some spares for a later date if needed ? I have decided to get another JB940 so that i will have the spare parts for the future as it is a good deck overall and will keep the belt in case it's needed at some pointAs for me fitting it then no i will pass on that as my dealer says he's more then capable Quote Link to comment Share on other sites More sharing options...
freddyjollo Posted October 23, 2015 Report Share Posted October 23, 2015 very sorry to hear it didn't go well :( Quote Link to comment Share on other sites More sharing options...
freddyjollo Posted October 23, 2015 Report Share Posted October 23, 2015 i dont know why sony didnt use cog wheels here seems a foolish design decision? Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 23, 2015 Author Report Share Posted October 23, 2015 very sorry to hear it didn't go well one of those things working in a area that's delicate Quote Link to comment Share on other sites More sharing options...
freddyjollo Posted October 23, 2015 Report Share Posted October 23, 2015 its a shame no one here can give definative info regarding which decks use the same transports then you might have been able to buy a cheaper deck and transplant the mechanism, which was my question above. Certainly this rubber band issue makes you wonder how long these decks will last as the assumption was that left unused they would be ok? now we know that there was a countdown from new? just because of a silly little rubber band! Quote Link to comment Share on other sites More sharing options...
sfbp Posted October 23, 2015 Report Share Posted October 23, 2015 It's all in the service manuals, Freddy. They've been posted at minidisc.org for years now. There are plenty of cog wheels already in the mechanisms - I think the rubber belts were/are a good engineering solution. All CD players and DVD drives use them in some form or other.As to which drives can be transplanted, of course one can make a list. But all that is required is a $5 belt.Nick, did you omit to remove the disk before disassembly? I'm sorry, I omitted that from my instructions. Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 23, 2015 Author Report Share Posted October 23, 2015 It's all in the service manuals, Freddy. They've been posted at minidisc.org for years now. There are plenty of cog wheels already in the mechanisms - I think the rubber belts were/are a good engineering solution. All CD players and DVD drives use them in some form or other.As to which drives can be transplanted, of course one can make a list. But all that is required is a $5 belt.Nick, did you omit to remove the disk before disassembly? I'm sorry, I omitted that from my instructions.i did not Stephan which was a bad error on my part as at the time it would not come out where as before he had albeit hit and mis as i say i hope to get hold of a newish 940 and i will now have some spare parts if needed i will let you know when i get hold of the new one although it may take some time is this model any good do you knowhttp://www.ebay.co.uk/itm/Sony-MDS-JB730-QS-Black-High-End-Minidisc-Deck-MINT-Condition-/181882628629?hash=item2a590caa15:g:wjcAAOSw9r1WBTVI Quote Link to comment Share on other sites More sharing options...
eriktous Posted October 23, 2015 Report Share Posted October 23, 2015 I got a JB940 earlier this year, which on occasion exhibited this problem of not ejecting the disc. Usually it would work fine, but if it had been turned off for a while with a disc inside, after turning it on the eject mechanism would make a slipping sound and the disc wouldn't come out until after several tries. I guess the slightly lower temperature inside when it had been turned off for a while had something to do with it.I replaced the belt just now. I was a bit hesitant to do it, because the deck would mostly function fine, but It is indeed dead simple. After removing the mechanism, the belt is easily accessible from the front and can be replaced with a little help from a highly specialized tool.P.s.: I just noticed I took the picture of the mechanism after I had already removed the belt. It goes around the two white wheels you can see on the front left. Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 23, 2015 Author Report Share Posted October 23, 2015 (edited) that's good to hear you were successful Edited October 23, 2015 by fourbanks Quote Link to comment Share on other sites More sharing options...
fourbanks Posted October 23, 2015 Author Report Share Posted October 23, 2015 its a shame no one here can give definative info regarding which decks use the same transports then you might have been able to buy a cheaper deck and transplant the mechanism, which was my question above. Certainly this rubber band issue makes you wonder how long these decks will last as the assumption was that left unused they would be ok? now we know that there was a countdown from new? just because of a silly little rubber band!i have a very rare cd recorder from marantz that skips for the first 5 minutes of playing but woks perfectly after that so i'm leaving alone just to be on the safe side http://www.hifiengine.com/files/images/MARANTZ DR6000 CD RECORDER PLAYER.jpg Quote Link to comment Share on other sites More sharing options...
freddyjollo Posted October 23, 2015 Report Share Posted October 23, 2015 It's all in the service manuals, Freddy. They've been posted at minidisc.org for years now. There are plenty of cog wheels already in the mechanisms - I think the rubber belts were/are a good engineering solution. All CD players and DVD drives use them in some form or other.As to which drives can be transplanted, of course one can make a list. But all that is required is a $5 belt.Nick, did you omit to remote the disk before disassembly? I'm sorry, I omitted that from my instructions.I wonder how long the the rubber bands will be available for? That website mentioned only had 65 left ( I bought 5 just in case ) then what? Quote Link to comment Share on other sites More sharing options...
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