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Sony MDS JB980 stuck on standby mode

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I have Sony MDS JB980 that is stuck on standby mode.
 
The fault is with the loading mechanism, every few seconds the motor & front pully turn a tiny bit then turn quickly back. I am unable to load a disc. If I switch the power off I can manually push the disc in, when I switch the power on the mechanism ejects the disc.
 
The error code history is 10,50,10,50,10,50,10,50,10,51    10 is loading error
 
The first problem I had was that the mechanism did not eject a disc. I replaced the front pulley belt, the original belt was broken.
 
Does anyone know how I can resolve this?
 
 
 
 

 

 

 

 

 

 

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  • 2 weeks later...

I have successfully fixed the 980 player. With the drive taken out of the player I removed the top part of the drive (that hinges at the front) and re-connected to the player, I switched on power and the player stayed on. The drive was able to re-align itself.

I removed the drive, put the top back on and re-connected. The player is now fully functionally.

Thanks sfbp for the advice.

I have a separate question, is this sony mds JB980 the best player that was made or is there an even better player, I could try to get this as a back up?

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This is a great deck. I have one FWIW.

I think perhaps one of the best of all is the JB940. Try to get the Japanese one if you think you want to use the PS/2 control via PC-Link. However the playback on the 980 is Type-S, one of the few that is.

Well done, anyway.

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  • 1 month later...
On 8/23/2019 at 8:17 PM, sfbp said:

This is a great deck. I have one FWIW.

I think perhaps one of the best of all is the JB940. Try to get the Japanese one if you think you want to use the PS/2 control via PC-Link. However the playback on the 980 is Type-S, one of the few that is.

Well done, anyway.

Hello sfbp

I am curious about your comment,

Is there another way to use the PS/2 port beside connecting a Keyboard?

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Not on most of the decks. Exception: MDS-PC3, MDS-JE770, MDX-D40

However nearly ALL the decks which have a keyboard and date from the MDLP era can be hooked up to the PC-Link (PCLK-MN10 or MN20) if the deck came from Japan and was intended for the domestic market there. Sophisticated tastes, have the Japanese audio consumer!

You can buy stuff on one of the Japanese auction sites (Yahoo! is by far the biggest) using a service (with English web interface).

This thread may be helpful

 

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  • 6 months later...

I have got the exact same problem on mine, exsept that I can't find what is the problem.

It started whit me changing the ruberbelt, but after puting everything back together it is dead.

I have mesured all the voltages and everything seems to be fine, all the switches are ok and in corect position, but the display is black and the standby led is on.

I can put it in servicemode and the display works like it is suposed to do and I can go thru all the diferent tests..  I have mesured all the flat cables and they are ok.

Does anybody have any clue to what is going on?

Petter Halonen

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Is it still in service mode? If so, can you move the sled with << and >>? You'll need it apart to see this.

Can you insert and eject a disk?

Does it respond to USB?

Does it play back?

I'm thinking maybe there is something to force reinitialization (evidently what happened to OP when his was magically fixed). Surely exiting Test mode by unplugging or perhaps pressing REPT will do the trick?

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9 hours ago, sfbp said:

Is it still in service mode? If so, can you move the sled with << and >>? You'll need it apart to see this.

Can you insert and eject a disk?

Does it respond to USB?

Does it play back?

I'm thinking maybe there is something to force reinitialization (evidently what happened to OP when his was magically fixed). Surely exiting Test mode by unplugging or perhaps pressing REPT will do the trick?

I can get it in to servicemode by pushing ams and stop simuntanuasly while plugging in the main lead.

The mecanic seems to be dead, does not respond to << or >> neighter can I insert or eject a disk, ecsept once it did actualy insert the disk. It does not spinn up the disk.

No respons on USB and no play back.  

What bother me is that it is not in proper standby. the viltages are there and the rele has switch on, but the display is black, the standby led is litt and the mecanic is dead.

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Go back and reseat the two ribbon cables. I’ve had that when they weren’t inserted fully at both ends. Hard to do but make sure they are not twisted if it’s a machine that has long ribbon cables. Also ensure the flying chassis lead is connected if it has one.

Kevin

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2 hours ago, kgallen said:

Go back and reseat the two ribbon cables. I’ve had that when they weren’t inserted fully at both ends. Hard to do but make sure they are not twisted if it’s a machine that has long ribbon cables. Also ensure the flying chassis lead is connected if it has one.

Kevin

I took both of them out and reseted them, then I mesured that there were contact. Still the player is dead.  

MDS-JB980cn1.jpg

MDS-JB980cn2.jpg

MDS-JB980top.jpg

MDS-JB980front.jpg

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Time to do what the OP did. Unscrew the drive and remove it from the chassis. ( 4 screws and of course the same cables)

Look very carefully at the mechanism. I think you will find it's stuck. Kevin, shouldn't he be able to move the insertion mechanism by hand? Is it ridiculous to take the rubber belt off again and see if the drive comes ready? (you'd have to remove the rubber band and THEN connect the power - no need to screw it back in, just connect up).

BTW, I can't remember what should happen; but when you have the drive completely removed and disconnected, see what happens if you turn on the power. Does the display light up at all?

(sorry, 3rd edit here) Can you, with the drive held in your hand and not connected to the chassis at all, remove the disk that's in there? If not, try to figure out WHY.

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14 minutes ago, sfbp said:

Kevin, shouldn't he be able to move the insertion mechanism by hand?

With the deck unplugged, you should be able to rotate that white cog at the rear right of the drive and slowly but surely eject the disc.

14 minutes ago, sfbp said:

BTW, I can't remember what should happen; but when you have the drive completely removed and disconnected, see what happens if you turn on the power. Does the display light up at all?

Possibly a bit machine depended. Can't remember exactly on my MDS-E10 if the display lights, but the audio bargraph doesn't light the bottom pips which it only does when the drive initialises correctly (which of course it can't do if it's not connected!).

 

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1 minute ago, kgallen said:

With the deck unplugged, you should be able to rotate that white cog at the rear right of the drive and slowly but surely eject the disc.

Possibly a bit machine depended. Can't remember exactly on my MDS-E10 if the display lights, but the audio bargraph doesn't light the bottom pips which it only does when the drive initialises correctly (which of course it can't do if it's not connected!).

 

Did what you told me, but no luck. still dead. The mecanic is not jamed in any way. I can easely turn the engine by hand and eject the disk..

MDS-JB980mecbelton.jpg

MDS-JB980mecbeltoff.jpg

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When you were adding the new belt (rubber band) did you at any time have to take off that spring on the left? Were there any other springs you had to replace as a result of the work, ie they popped off or simply fell out, or you had to remove them? If so, is there an issue about what position the mechanism was in when the spring was replaced?

(edit) one more question: is the disk platen (is that the right word) that contacts the MD in the middle able to turn? I can't tell from the aerial view if everything is vertically separated and free....

(and another question) is there any issue with the connectors to the front panel (ribbon cable)?

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I'm not convinced the wide long ribbon cable is the right way around in the green connector on the main motherboard - from the second photo on your post a few back. Looks to me like the blue plastic stiffener is on the side where the spring contacts are. All ribbon cables, make sure the exposed contacts on the cable are on the side the spring contacts are exposed in the female connector on the PCB.

I can see on the short cable that it is the correct way round on the main PCB. Check the others are similarly oriented in the socket. It's a bit hard to be sure from the photos.

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Actually at this point I really need to point out you need to be REALLY CAREFUL OF THE LASER OUTPUT.

You have so much of the top of the drive off, there may be an interlock to stop the laser coming on. But there might not be and if you fire this thing up and look at the laser you WILL BE BLINDED. You cannot see the laser light, it is invisible, even whilst you have your sight.

EXTREME CAUTION!!!

No more comments from me until I know you've seen this warning.

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As *I am an proffesionel radio/TV repairman I know the danger of lasers. The thing is I have repaired many MD-players and CD-players before, but never seen this fault.

The sleede does move frealy .

The long riboncable is the rigt way as you can see from added pictures.

Adding more pictures of the mecanic for you to see. 

and also mp4 file of how it was before it died.

MDS-JB980BDboard.jpg

MDS-JB980mecdisambledtop.jpg

MDS-JB980mecside4.jpg

MDS-JB980mecside3.jpg

MDS-JB980mecside2.jpg

MDS-JB980mecside1.jpg

MDS-JB980mecunder.jpg

MDS-JB980cnclose2.jpg

MDS-JB980cnclose1.jpg

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OK great Petter, thanks.

Myself I would be tempted to rewind here. I'm not sure we need to take this machine apart so much given what we should have performed initially. We shouldn't be looking for a complex fault.

  1. We know we had a perfectly working machine prior to the belt change. We did a simple repair action to replace the belt with one of a similar size and thickness. The new belt is not fouling the adjacent rack gear.
  2. We reassemble the drive with the spring to the left and the retainer slide engaged at the rear. Both pivot pins at the front are engaged correctly.
  3. If disconnected, we reconnect the pair of ribbon cables to the drive end, ensuring the ribbon contacts mate with the socket contacts and they are fully inserted 'square'.
  4. We mount the drive to the chassis, ensuring the 4 bushes are the correct way round to set the drive height correct for the loading slot. We have 4 shouldered machine screws to mount the drive.
  5. We ensure any flying earth leads connected to the drive are connected to the chassis.
  6. We ensure the ribbon cables at the main PCB end are inserted fully and square.
  7. We reconnect mains power and press standby.
  8. The machine possibly flashes "Initialise" and the drive settles to an idle position.
  9. We have a repaired machine.

So, which step went wrong for us?

Were other actions performed that changed the situation and can help us repair this "remotely"?

The pictures are a great help, but I don't at this point see anything amiss with what I see.

I don't have this machine myself buy I have several (many!) with this (MDM7-series) drive, that I've replaced the belt on (440, 480, E10, E12). My machines all have comparable internal layouts to this one.

(Edit to correct Petter's name, sorry!)

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