Hi all,
I'm having on my bench for repair a Marantz UD-5005 Super Audio CD/DVD Player which seems to work fine, except for the drawer. When it came to my hands, it wouldn't open the drawer at all. I then opened and dismantled the covering and if I gave it some help by hand, it would eventually move partially. I took the drawer out and eventually the motor would start running in both directions according to pressing the button for opening or closing, it would engage the gears with the belt. So, I changed the belt, thinking it might be worn (looked a bit off), but no, it now was opening and closing with real difficulty and would never finish its way (when it closes, it has to lift the optical pickup, which takes some strength). So I lubricated everything. Seems to move all very well now, BUT, the motor still doesn't manage to finish the loading of the CD, it goes to that point where the tray is in, but the pickup is not lifted correctly, and then ejects again after some seconds.
I ended up dismantling the whole drive mech until reaching the drawer motor, gears and limit switch, which are really badly placed underneath, and I have three ideas of what could cause this, but would like to hear opinions of other people with experience, maybe there's even someone who has worked on this model. Ah, I forgot to mention that I have the service manual which is NOT helpful for this: they basically say that if the drive doesn't work (be it OPU or drawer or whatever), substitute the whole thing with a new one! :O :O so sad.
1 - could this be a defective motor? I mean, oxidized parts on motor brushes or something, which makes it not have strength or stall suddenly at some place? I've seen this on old motors, for example Nakamichi tape decks. This is a player from 2010 - would that be odd? But, it really looked like this in the beginning - the motor would only move with help, then started to get better. Then wouldn't improve more. Yes, I tried lots of deoxit spray - no difference. This is indeed one of these shitty tiny chinese NONAME motors. Oh yes. I have to confess I don't like the build quality of this Marantz player, although it seems to be well regarded in terms of sound and picture.
2 - could this have a defective motor drive circuit? The service manual does NOT contain schematics, so I don't know how to check this. Any idea what voltages I could except to measure at motor contacts?
3 - Could this be caused by defective limit switch? It gives strange readings. It has three positions: left and right, which correspond to the open and closed position of tray (where closed actually means: pickup is lifted and disc is clamped), and center, where it open (drawer is on its way). But: even though it has several contacts, they all seem to measure continuity when the switch is outside of center position, no matter if left or right! That doesn't make sense in my head. Again, no schematic for this! Anyone has any idea if this is normal? I think, if this was normal, why bother use a limit switch with three positions (center, left, right?)?
Thanks a lot in advance for ANY commentes, hints, suggestions for this!
I'm having on my bench for repair a Marantz UD-5005 Super Audio CD/DVD Player which seems to work fine, except for the drawer. When it came to my hands, it wouldn't open the drawer at all. I then opened and dismantled the covering and if I gave it some help by hand, it would eventually move partially. I took the drawer out and eventually the motor would start running in both directions according to pressing the button for opening or closing, it would engage the gears with the belt. So, I changed the belt, thinking it might be worn (looked a bit off), but no, it now was opening and closing with real difficulty and would never finish its way (when it closes, it has to lift the optical pickup, which takes some strength). So I lubricated everything. Seems to move all very well now, BUT, the motor still doesn't manage to finish the loading of the CD, it goes to that point where the tray is in, but the pickup is not lifted correctly, and then ejects again after some seconds.
I ended up dismantling the whole drive mech until reaching the drawer motor, gears and limit switch, which are really badly placed underneath, and I have three ideas of what could cause this, but would like to hear opinions of other people with experience, maybe there's even someone who has worked on this model. Ah, I forgot to mention that I have the service manual which is NOT helpful for this: they basically say that if the drive doesn't work (be it OPU or drawer or whatever), substitute the whole thing with a new one! :O :O so sad.
1 - could this be a defective motor? I mean, oxidized parts on motor brushes or something, which makes it not have strength or stall suddenly at some place? I've seen this on old motors, for example Nakamichi tape decks. This is a player from 2010 - would that be odd? But, it really looked like this in the beginning - the motor would only move with help, then started to get better. Then wouldn't improve more. Yes, I tried lots of deoxit spray - no difference. This is indeed one of these shitty tiny chinese NONAME motors. Oh yes. I have to confess I don't like the build quality of this Marantz player, although it seems to be well regarded in terms of sound and picture.
2 - could this have a defective motor drive circuit? The service manual does NOT contain schematics, so I don't know how to check this. Any idea what voltages I could except to measure at motor contacts?
3 - Could this be caused by defective limit switch? It gives strange readings. It has three positions: left and right, which correspond to the open and closed position of tray (where closed actually means: pickup is lifted and disc is clamped), and center, where it open (drawer is on its way). But: even though it has several contacts, they all seem to measure continuity when the switch is outside of center position, no matter if left or right! That doesn't make sense in my head. Again, no schematic for this! Anyone has any idea if this is normal? I think, if this was normal, why bother use a limit switch with three positions (center, left, right?)?
Thanks a lot in advance for ANY commentes, hints, suggestions for this!
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Never mind, seems to have fixed itself! :O :O
Didn't see this one coming. As I said, I took it all apart to be able to measure.
Now, I was just playing with the opening/closing mech of the drawer and decided to power it up without optical pickup unit in place just to test the drawer mech and understand the limit switch (which was working fine). I noticed that now the support for the OPU would raise (it didn't before). So, just for fun, I installed the OPU and.... behold, it would go until the end and clamp the disc! :O
Put it all back together and it's really odd, it all works fine now! I don't understand what happened, maybe the mech had been stuck somewhere and taking it all apart and back together solved this?
It wasn't the motor, it for sure is weak and cheap, but is moving just as slowly as before, but now the drawer works flawlessly.
Well, going to do some pretty heavy testing on this one (loading/unloading) until I declare it repaired, as I don't like this kind of "magic" repairs, sometimes they are not real and the fault reappears later...
Didn't see this one coming. As I said, I took it all apart to be able to measure.
Now, I was just playing with the opening/closing mech of the drawer and decided to power it up without optical pickup unit in place just to test the drawer mech and understand the limit switch (which was working fine). I noticed that now the support for the OPU would raise (it didn't before). So, just for fun, I installed the OPU and.... behold, it would go until the end and clamp the disc! :O
Put it all back together and it's really odd, it all works fine now! I don't understand what happened, maybe the mech had been stuck somewhere and taking it all apart and back together solved this?
It wasn't the motor, it for sure is weak and cheap, but is moving just as slowly as before, but now the drawer works flawlessly.
Well, going to do some pretty heavy testing on this one (loading/unloading) until I declare it repaired, as I don't like this kind of "magic" repairs, sometimes they are not real and the fault reappears later...