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M1JWR

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Posts posted by M1JWR

  1. thanks for the pics, never thought of making a test jig, ive seen it in the service manual i downloaded, mdm 5 looks easiest, might have something knocking about from an old scrapped board for the plug end, then a piece of veroboard and some contact pins, no doubt the mdm 7 one can be done with veroboard also, if not will have a look at somewhere like farnells or rs components, apparently the iop is written on a sticker on the laser on the mdm 5's, the sticker is there but no writing, drat !! I cant be far away or it probably wouldent work very well or at all, ive put that deck in a box just now, suppose getting it working is a good start, had a quick look at that 520 that i have thats complete from a while ago and its iop is 54.1, i realise that it dosent really tell me anything , just probably its unique for that perticular machine, i tend to stick with the simple mdm shot belt issues, but of course the odd one turns up with a bit extra, like the 440 with a bd board swap and the 940 that started it all for me when we stumbled on the ribbon cable partial cure for some faults, it also had a fault with one of the optical inputs as it was getting no power, an invisable hairline through a track was the fault, so i jumped it with a wire link, all good education.

  2. always liked the maxell md74 golds and the pro 80's, used to get them in asda back in the day, pukka gold coloured discs aswell, unlike the md rxg's that looked gold until you slide the door and find out they are ordinary silver discs, dont know if gold coloured vs silver makes any difference, probably not, if it does, shame on you tdk we were conned, sony premium/prisims come to mind aswell, however i have not had any problems with any of them and they are 20 years old, cant say that about a solitary sharp one i have, i have one jvc like in the pic above, its been ok aswell, still has its 20 year old recordings on it.

  3. Had a busy day so far, had removed the ex 940 laser, cant remember the history properly, think it was iffy to start with, only played certain discs, have now put the ex now i remember 920 laser in, its original drive had a broken chassis mount  and a knackered owh, probably from transit, thats how i originally got it anyway, when i installed the 920's laser i also used its rack part and its sled pin, i also discovered that the ribbon for the 930's owh was cut through (not by me) so changed it for the ribbon off the 920's owh, that was a tricky job, the 930's spindle platter looked iffy, so also put the ex 920's spindle motor in, also as its mint and works, was tested via applying about 3.5 v to it, to cut out boring detil, have now reassembled and its working folks, havent tried record as yet but it definately plays, i dont have a iop value for this one though, the original iop on the 930 was 55.8 and on the ex 940 drive was 51.8, its set to that just now, i take it the higher the figure the more oomph it will give for recording so thats where adjustment will be needed, gradually up until it records, that if it dosent record already, if it does will leave well alone. cheers ngy for you assistance so far. parts for the bin ex930 laser, ex920 owh or whats left of it, ex 930 owh ribbon, dont know about the ex940 laser as its really unknown, did notice the switch boards are different the ex920 one is smaller than the 930 one.

    can now report that it does record and writes toc and plays again after toc is written, used optical in from pc

  4. also i sill have the remenants of that mdm 7 drive and as far as i can remember the laser works, kms 260 b version, 520 has the a version, nowt nor summat, worth a go as in this position i dont have a lot to use, gonna test the spindle motor first by applying a small voltage to see if it spins, if it dosent then there may be a clue.

  5. quite strange that, the rest ie where the op is and the mechinical parts look the same, and for all the world you would think you would be able to do that, swapping the bd's, then the cheap way would be to swap lasers, but i dont have the gear, lpm's etc, having said that, with 2 drives with interchangable parts i wont have a lot to loose will i. after that i think the 530 is the only common model that the 930 is compatable to drive wise, ofcourse there could be somthing else causing it, not ribbons this time, will look that way first before i take anything to bits

  6. got that deck working, well sort of, cleaned laser and contacts etc, laser looked a bit cloudy, anyway still c13, no activity whatsoever nowt,
    its working with a drive out of another 930 inside, so rest of player seems good, knock that out of the equasion.
    i will have another couple of goes cleaning laser whilst drive is out.
    as its sat for years things may be cloudy below the lense, i am not changing lasers as thats frought with problems.
    then two possible routes of attack after that, one costs nowt and the other will cost a few quid.
    the nowt one will require work and i dont know anybody thats done it before with two varients of the same type of drive unit.
    i have a 520 spare drive thats laser is good, so the idea would be to change the bd boards as the 930 is type r and the 520 is not, the rest of the drive
    looks identical, would need the 930's owh as the 520 one is shot, biggish job then.
    the other is to wait for a 530 to come up, cheap thats is rough on the outside but works, easy peasy after that.
    suppose if nobody tries it then nobody will ever know
     this deck is in near mint condition and came with the original remote, and thats a plus, they can sell for lots on their own
    buy a remote get a deck free
  7. the 440 admittedly has a smaller board inside, but with better quality proper components on it, the 470 has a larger main board with lots of jumper wires, the 470 board itself is more flimsy, diddent take much notice of chipsets themselves, i forget the psu section and the drive unit is the same obviously, outside the 440 cases are thicker material and the front panel is a more solid construction and overall the 440 feels a little heavier than the 470/480, display functions are similar though the display board is very different as controls are in different places, its a bit like the thread on the 980 vs 930/940 etc, in that case the 980 is the same as, say, the 940 on the outside, for example the 940 has a proper toroidal psu and the 980 has a nastier standard iron core jobbie, which looks like the 470/480 one, so yes as the years went by , cost reduced to hell and back.

  8. That other 470 arrived, usual issues, eject belt and as it seems with this model and the 480 no doubt, a slightly sticky ams function, switch cleaner only this time, chalk another up.              

    the stuck disc was fubar though it went into the bin

  9. no spare drives as such, just a 7 drive in many bits and a 5 drive with knackered owh

    at the moment, 1 x 520, 1x 940, 2 x 930, 2 x 920, 1 x 480, 2 x 470, 2 x 440, and the 980 i have have had for a lot of years, 1 930 had nowt wrong with it when the guy thought it had, it was 35 quid, thats the price area i look at, might double that for a 940 faulty, a mate of mine does tape decks, he has about 20, then has a clear out every so often, he likes nak's, loadsa money for those, he has all the test kit for them, fixing them is his hobby, you could get a 470or similar , stuck on standby guarenteed it will have a disc stuck inside for around 30 quid or sometimes less, cheap enough to have a bit of fun and not loose any sleep over it, have a go, dont go for that 470 thats on there just now with 4.99 start with c13, that one is a dog, i sometimes vary out into marantz cd63/67 cd players, plenty of parts and easy to fix, even ones that are totally dead.

  10. nah a black one, and remotes are rare and expensive, i bought a rm-d13m not long ago for a tenner inc post, bargain, it would be for a ja20es, its like a master remote as everything is on it.

    the only player i got spares or repair with a remote was a 440, it came with a rm-d7m a while ago, remotes are sold seperately most of the time as they can be as much as the player. i saw a remote for a 930 not long ago and it made over 60 quid, crackers !!

  11. no problem with chipping in, its all good education, with us as amateurs lots of things are discovery and trial and error, i never even thought to check the iop originally, i thought as the drives as being 7a varient would be all the same and i couldent change that coil, and went ahh yes i have a replacement part, i wonder if that will work, and so far it looks to have done.

    the problem with that old 940 drive was that the clip that holds the top part was broken off, and basically in that case i would imagine your screwed, ive seen people changing the belts on youtube and when they get to that part, i think is he gonna break it because i would imagine it would be easily done

  12. thats exellent kevin, i had to find out how to recognise number, its on a sticker on rear of drive unit, the ex 940 drive said 518 and sure enough in the menu it is 51.8, this drive has a sticker that says 505 so will change to that figure 50.5, followed procedure, had to swap drives back as ams on 470 needs cleaned as no contact when pressing it in with stop on service power up, cheers kevin, something else ive learned

  13. have now swapped bd boards from the ex 940 broken drive to this one, it involves 1 screw, several solder points, mostly motors and a thin ribbon cable for laser to bd board, had 1 switch to align behind a plastic part and then re solder, if anybody wants to see the underside of mdm7 bd board here is a pic, i now have a working machine, not tested on record as yetDSC00039.thumb.JPG.cd9324bb775cfa87d2b29e31057b081c.JPG

  14. i actually put it into the 470 using its ribbons, they are different, one is much longer, same result

    the 440 has the 470's drive inside with the 440's ribbons and works spot on

    issue is with the drive unit itself, will investigate further later

    could even be the connections for the ribbons on the drive itself

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