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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Sony CDP-C335 carousel doesn't align with clamping assembly.
This Sony CDP-C335 is just a few millimeters away from working properly.
When the 5 disk carousel rotates the CD into place, the clamping mechanism closes but the metal pin in the clamping mechanism which is supposed to line up with the hole in the carousel is not lining up properly. It either makes a loud snapping noise as the pin forces its way through the hole in the carousel or the clamping mechanism jams completely as it cannot force its way into place since the alignment between the two is off. The belt in the carousel mechanism has good tension and is not slipping. Anyone seen this problem before? Thanks for your reply. -- David Farber Los Osos, CA |
#2
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Sony CDP-C335 carousel doesn't align with clamping assembly.
"David Farber" wrote in message ... This Sony CDP-C335 is just a few millimeters away from working properly. When the 5 disk carousel rotates the CD into place, the clamping mechanism closes but the metal pin in the clamping mechanism which is supposed to line up with the hole in the carousel is not lining up properly. It either makes a loud snapping noise as the pin forces its way through the hole in the carousel or the clamping mechanism jams completely as it cannot force its way into place since the alignment between the two is off. The belt in the carousel mechanism has good tension and is not slipping. Anyone seen this problem before? Thanks for your reply. -- David Farber Los Osos, CA You know, I rather think I have, but I can't for the life of me remember what was causing it. Was it a mechanical alignment issue maybe ? I have a dim recollection of something geared being a tooth out. A further dim recollection is of letting it settle in the jammed position, then de-powering and undoing the screw in the centre of the carousel, and lifting it to disengage it from its drive so that it could be rotated to line up correctly, before dropping it down again, and refitting the screw. I might be thinking of something else entirely, but something is chiming deep in the shadowy recesses of what passes for my mind ... :-) Arfa |
#3
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Sony CDP-C335 carousel doesn't align with clamping assembly.
Arfa Daily wrote:
"David Farber" wrote in message ... This Sony CDP-C335 is just a few millimeters away from working properly. When the 5 disk carousel rotates the CD into place, the clamping mechanism closes but the metal pin in the clamping mechanism which is supposed to line up with the hole in the carousel is not lining up properly. It either makes a loud snapping noise as the pin forces its way through the hole in the carousel or the clamping mechanism jams completely as it cannot force its way into place since the alignment between the two is off. The belt in the carousel mechanism has good tension and is not slipping. Anyone seen this problem before? Thanks for your reply. -- David Farber Los Osos, CA You know, I rather think I have, but I can't for the life of me remember what was causing it. Was it a mechanical alignment issue maybe ? I have a dim recollection of something geared being a tooth out. A further dim recollection is of letting it settle in the jammed position, then de-powering and undoing the screw in the centre of the carousel, and lifting it to disengage it from its drive so that it could be rotated to line up correctly, before dropping it down again, and refitting the screw. I might be thinking of something else entirely, but something is chiming deep in the shadowy recesses of what passes for my mind ... :-) Arfa From what I can tell, there are some optical sensors that monitor the position of the carousel. So removing the carousel and then repositioning it shouldn't really matter. When I removed the carousel to inspect the belt, I reinstalled it so it was centered. I'm wondering since it's always hitting the trailing edge of the hole, perhaps the carousel isn't braking soon enough after the uP turns off the carousel motor? Thanks for your reply. -- David Farber Los Osos, CA |
#4
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Sony CDP-C335 carousel doesn't align with clamping assembly.
"David Farber" wrote in message
... This Sony CDP-C335 is just a few millimeters away from working properly. When the 5 disk carousel rotates the CD into place, the clamping mechanism closes but the metal pin in the clamping mechanism which is supposed to line up with the hole in the carousel is not lining up properly. It either makes a loud snapping noise as the pin forces its way through the hole in the carousel or the clamping mechanism jams completely as it cannot force its way into place since the alignment between the two is off. The belt in the carousel mechanism has good tension and is not slipping. Anyone seen this problem before? Thanks for your reply. -- David Farber Los Osos, CA I think I would look at the flat wire from the carousel down to the main board. Seen a few bad, and the opto-sensing would certainly be affected by this. Mark Z. |
#5
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Sony CDP-C335 carousel doesn't align with clamping assembly.
"Mark Zacharias" wrote in message ... "David Farber" wrote in message ... This Sony CDP-C335 is just a few millimeters away from working properly. When the 5 disk carousel rotates the CD into place, the clamping mechanism closes but the metal pin in the clamping mechanism which is supposed to line up with the hole in the carousel is not lining up properly. It either makes a loud snapping noise as the pin forces its way through the hole in the carousel or the clamping mechanism jams completely as it cannot force its way into place since the alignment between the two is off. The belt in the carousel mechanism has good tension and is not slipping. Anyone seen this problem before? Thanks for your reply. -- David Farber Los Osos, CA I think I would look at the flat wire from the carousel down to the main board. Seen a few bad, and the opto-sensing would certainly be affected by this. Mark Z. Hi Mark, The flat wire checks ok. I've looked around this area and the only suspicious thing I've found is that the carousel has a lot of loose travel in it when it's at rest. I measured about 2.5mm of wiggle room at the circumference of the carousel. That's plenty of error to cause problems. I think the intermediate gear between the worm gear and the carousel is worn out. It's location #66 on the parts blowup on page 22 of the service manual he http://www.electronica.ro/service_ma...ayer/cdp-c335/ Thanks for your reply. -- David Farber Los Osos, CA |
#6
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Sony CDP-C335 carousel doesn't align with clamping assembly.
This problem is usually 1 of 2 things.
1) The gears are outof timing by 1 tooth. 2) The green flat cable that goes fro the deck to the board is defective. This won't be visible as the connections are intermittant. Replace the cable first. This may resolve the problem. Dan |
#7
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Sony CDP-C335 carousel doesn't align with clamping assembly.
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#8
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Sony CDP-C335 carousel doesn't align with clamping assembly.
The cable I described developes cracks with age. This causes intermittant connections withint hte cable. I have repaired a number of these units, some of which had the problem you described. Some of these also were "fixed" by replacing the cable. The cable is by no means the only cause of hte problem you describe. The photo trnasistors can be bad, the digital transistors (DTC) that "digitize" the transition can be faulty as well. The bottom line here is that there are many potential causes of the problem. Experience will provide you with clues (as I and others posted here).
A cam gear off by 1 tooth can cause this problem as well. Obtain the service manual which contains the alignment marks to verify proper alignment of the tray as well. Dan |
#9
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Sony CDP-C335 carousel doesn't align with clamping assembly.
So taking that all into consideration, I took some needle nose pliers and
slightly tweaked the metal pin that was misaligned with the hole in the carousel. Now it fits just fine when the cam elevates the play mechanism into position. I say -- without sarcasm -- that it's gratifying when common sense works. (It so rarely does when servicing electronic equipment.) The reason this wasn't solved sooner was that there was no obvious /reason/ why the pin should have been misaligned in the first place. How /could/ it have gotten misaligned? I had a similar problem 40 years ago. I pulled out my Nikon F and discovered the film advance was jammed. It turned out the take-up hub had been BENT at the middle, as if someone had banged it with a mallet. How did it happen? I never learned. |
#10
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Sony CDP-C335 carousel doesn't align with clamping assembly.
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#11
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Sony CDP-C335 carousel doesn't align with clamping assembly.
William Sommerwerck wrote:
So taking that all into consideration, I took some needle nose pliers and slightly tweaked the metal pin that was misaligned with the hole in the carousel. Now it fits just fine when the cam elevates the play mechanism into position. I say -- without sarcasm -- that it's gratifying when common sense works. (It so rarely does when servicing electronic equipment.) The reason this wasn't solved sooner was that there was no obvious /reason/ why the pin should have been misaligned in the first place. How /could/ it have gotten misaligned? I had a similar problem 40 years ago. I pulled out my Nikon F and discovered the film advance was jammed. It turned out the take-up hub had been BENT at the middle, as if someone had banged it with a mallet. How did it happen? I never learned. The pin probably wasn't misaligned in the CD player. Anywhere along the line there could have been something that was warped. But the easiest way to correct it was to just tweak the pin. By the way, that Nikon F is a sweet camera. (-: Thanks for your reply. -- David Farber Los Osos, CA |
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