Hi
I have a Marantz CD50SE with the above mech.
It makes a repetitive chirp/squeak while playing. On quiet passages you can hear it if you're sitting within about three metres. It's always done this (I bought it second hand about five years ago or more).
Can anyone enlighten me as to whether it can / should be lubricated and where? Or is this possibly the laser making the noise?
I have some very good quality Moebius synthetic watch oils which could be used.
Cheers
Stuey
I have a Marantz CD50SE with the above mech.
It makes a repetitive chirp/squeak while playing. On quiet passages you can hear it if you're sitting within about three metres. It's always done this (I bought it second hand about five years ago or more).
Can anyone enlighten me as to whether it can / should be lubricated and where? Or is this possibly the laser making the noise?
I have some very good quality Moebius synthetic watch oils which could be used.
Cheers
Stuey
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Tumbleweed blows past... 🙄
Pulled the laser mechanism out and relubed the clamp (which I'd done before with no effect). Can't really get to the motor shaft so that's no use. I did use a watch oiler to place a minute drop of Moebius on the shaft, but don't expect this to make a difference. It hasn't so far. Can't get to the bottom bearing as it's sealed.
I also have a Philips CD624 which makes a similar noise, but have never owned a new CDM 4/19 so don't know if this is as they always were, or not.
Anyone know? I might look for a replacement if they are usually quiet.
Pulled the laser mechanism out and relubed the clamp (which I'd done before with no effect). Can't really get to the motor shaft so that's no use. I did use a watch oiler to place a minute drop of Moebius on the shaft, but don't expect this to make a difference. It hasn't so far. Can't get to the bottom bearing as it's sealed.
I also have a Philips CD624 which makes a similar noise, but have never owned a new CDM 4/19 so don't know if this is as they always were, or not.
Anyone know? I might look for a replacement if they are usually quiet.
i could always hear those CDM4 (and 2) mechs making little 'tjitjitji' noises. some where more noisy than the other, but none were absolutely silent.
Ha ha! That's exactly the sound!
I'll just soundproof the player cabinet as much as I can. Thanks for the reply.
Usually, the cause is the inevitable slight shaking of the suspended sub chassis on it's very squishy springs causing a little rubbing of some part/parts of it against parts of the loading mech. The problem becomes worse when there is eccentricity in disc rotation, which is usually caused by non-flatness of the disc clamper plate's bearing surface, from the clamp's ball bearing wearing into it, or by clamping weights that are well balanced.
Hmm, ok, thanks. I did have a look when I removed the unit the other day. I assume these springs are tuned to allow movement of a particular frequency. I guess one could damp them with, say, foam inside the coils and see what happens.
I must say though, it doesn't sound like something rubbing in my unit's particular case. Easy to test - just run the player with the lid off and observe (with due care re. laser).
I must say though, it doesn't sound like something rubbing in my unit's particular case. Easy to test - just run the player with the lid off and observe (with due care re. laser).
I just got a Philips CD-582 yesterday with the same mech and it also makes this "chirping" sound as well as a dreadful rough rattling sound when the drawer closes without a CD in there.
The sound your hearing is from the focus and radial servos, which keep the laser focused on the CD track, compensating for warp and eccentricity in the disc. All of these style of laser mechanism make this noise, especially when first locking onto a track.
It shouldn't really make enough noise to be audible at any distance from the player. I'm not really sure there's many obvious things to do about it, but one thing that I would try is to check and possibly readjust the focus offset. For the Marantz CD50 that's potentiometer 3568, adjusted so that the voltage across capacitor 2561 is 400mV. Check the service manual for more detail.
It shouldn't really make enough noise to be audible at any distance from the player. I'm not really sure there's many obvious things to do about it, but one thing that I would try is to check and possibly readjust the focus offset. For the Marantz CD50 that's potentiometer 3568, adjusted so that the voltage across capacitor 2561 is 400mV. Check the service manual for more detail.
pizzaman, I'd suggest you possibly need a new drawer gear - good ones available on eBay. They get very noisy before they fail completely. Search eBay on 'CDM 4 drawer gear'.
amc, thanks for that information. I have the service manual and will have a go at that adjustment when I do some other mods in the pipeline. I must say though, that the noise is quieter now once the watch oil has penetrated a bit. Go figure. But as you suggest, it doesn't sound like bearing noise - sort of an electronic chirp. You're right, the noise is louder when you first load a disc, when the more energetic focussing is happening.
It's only audible on very quiet tracks.
Cheers all
Stuey
amc, thanks for that information. I have the service manual and will have a go at that adjustment when I do some other mods in the pipeline. I must say though, that the noise is quieter now once the watch oil has penetrated a bit. Go figure. But as you suggest, it doesn't sound like bearing noise - sort of an electronic chirp. You're right, the noise is louder when you first load a disc, when the more energetic focussing is happening.
It's only audible on very quiet tracks.
Cheers all
Stuey
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Cheers guys I'll have a look into that. I'll be having the main board out soon to nick the DAC and filter for my Marantz CD-75mk1as soon as I can figure out how to remove the CDM4/19 without buggering it up!
It was only a tenner off ebay anyway as I bought it for the chips but I quite like the large display similar to the Mission PCM 4000/7000 units so it's definitely a keeper.
It was only a tenner off ebay anyway as I bought it for the chips but I quite like the large display similar to the Mission PCM 4000/7000 units so it's definitely a keeper.
Btw that awful (ratcheting) noise happens after the drawer has closed and it tries to search for TOC without disk inside.
Oh, it's probably just the disk clamp then.
The CDM mech is removed by levering a plastic retaining clip thingy down at the right rear of the mech as you face the machine, then it lifts up at that side, hinging on two similar retainers on the left side. Then it just lifts off; be careful of the wires underneath. This is of course after you've removed the drawer.
It's hard to explain; better you get a hold of a service manual for any of the CDM 4/19 machines.
Stuey
The CDM mech is removed by levering a plastic retaining clip thingy down at the right rear of the mech as you face the machine, then it lifts up at that side, hinging on two similar retainers on the left side. Then it just lifts off; be careful of the wires underneath. This is of course after you've removed the drawer.
It's hard to explain; better you get a hold of a service manual for any of the CDM 4/19 machines.
Stuey
Hmm removed the drawer eh ? I'd assumed that the whole thing lifted out in one piece - this is exactly why I'm wary of doing it - too many little bits that can go "p'twing !"😱
Can't find the manual about - I''ll have a look if the removal instructions come with a similar spec machine.
Can't find the manual about - I''ll have a look if the removal instructions come with a similar spec machine.
Usually you loosen the front panel of the machine and pull it forward about 3cm or so, then pull the drawer out and down and it will come away from the machine. It's very easy - the only bit that may go p'twing is the disc clamp spring. Remove this first and the disc clamp will lift away vertically. This all assumes your model is like most of the others out there with this mech. For a manual, see Jan Dupont's free manual site just reopened; there's a new thread with a link under the Solid State forum on here. May have one that will help, although it doesn't have yours. The CD624 manual may help.
http://www.audio-circuit.dk/
http://www.audio-circuit.dk/
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Thanks Stuey and apologies for the late reply - I've been busy nos'ing my Marantz 75. Managed to get the drawer and clamp off the Philips cd582 - couldn't find those retaining clips you referred to but there were 4 screws, 1 on the back 1 on the right side 1 on the right front and one underneath got those out and the mech was almost free no probs.
Undid the spindle motor cable and then AAAARRGH that bloody ribbon cable on the left side - I just could not figure out for the life of me how to access it and unplug it without unscrewing the top plate of the spindle, unless of course I'm supposed to - any ideas ??
Undid the spindle motor cable and then AAAARRGH that bloody ribbon cable on the left side - I just could not figure out for the life of me how to access it and unplug it without unscrewing the top plate of the spindle, unless of course I'm supposed to - any ideas ??
The clips allow you not to remove the suspended part. Anyway, no I didn't need to remove the ribbon as I could do what I had to by leaving the ribbon connected.
I'd try either a new thread with appropriate title, or posting on one of the threads on modding one of the cdm 4 equipped players. There would be plenty on here that would know, but it's just a matter of accessing them!
I'd try either a new thread with appropriate title, or posting on one of the threads on modding one of the cdm 4 equipped players. There would be plenty on here that would know, but it's just a matter of accessing them!
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