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#1
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CD drive magnet problem
I've been experimenting trying to understand what is wrong with my DVD
writer tray eject mechanism. After installing a software that would automate trying to eject 5 times before it quits trying, I was able to 'calculate' that it sometimes took 10-20 consecutive tries until/but it would finally open. Then after further determining that it didn't matter whether windows or some other OS or no OS other than BIOS was in control, the problem was the same, I made another discovery. If there were a CD in the tray, it would open every time under the same conditions that previously required 20 tries to open. Then I started searching on terms related to that behavior and found that there were a number of webforums where this same problem was described and remedied, particularly with my type/brand/model of drive. The basic problem is that there is a plastic puck containing a magnet over the disk spindle which is used to hold/secure the CD on the spindle. When ejecting, it is necessary that the tray ejection mechanisms overcome any attraction between the magnet and the spindle, which attraction is apparently stronger when there is no disk under the magnet. The two types of fixes consisted of either disassembling the over part of the magnet/puck container and adding a 'diffusion' layer of space under the magnet or by disassembling the under part and tweaking the mechanics of the tray ejection pully/belt/wheels to improve the tray ejection force. Personally I'm currently solving the problem by keeping a disk in the tray instead of fixing it. I never knew before there was a strong magnet to hold the disk down/steady, and apparently there are other important magnets in CD drives as well. Magnets are used in the motor to spin the drive, in the lens tracking process, and in the relay switches. -- Mike Easter |
#2
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CD drive magnet problem
In article , Mike Easter wrote:
I've been experimenting trying to understand what is wrong with my DVD writer tray eject mechanism. After installing a software that would automate trying to eject 5 times before it quits trying, I was able to 'calculate' that it sometimes took 10-20 consecutive tries until/but it would finally open. Then after further determining that it didn't matter whether windows or some other OS or no OS other than BIOS was in control, the problem was the same, I made another discovery. If there were a CD in the tray, it would open every time under the same conditions that previously required 20 tries to open. Then I started searching on terms related to that behavior and found that there were a number of webforums where this same problem was described and remedied, particularly with my type/brand/model of drive. The basic problem is that there is a plastic puck containing a magnet over the disk spindle which is used to hold/secure the CD on the spindle. When ejecting, it is necessary that the tray ejection mechanisms overcome any attraction between the magnet and the spindle, which attraction is apparently stronger when there is no disk under the magnet. The two types of fixes consisted of either disassembling the over part of the magnet/puck container and adding a 'diffusion' layer of space under the magnet or by disassembling the under part and tweaking the mechanics of the tray ejection pully/belt/wheels to improve the tray ejection force. Personally I'm currently solving the problem by keeping a disk in the tray instead of fixing it. I never knew before there was a strong magnet to hold the disk down/steady, and apparently there are other important magnets in CD drives as well. Magnets are used in the motor to spin the drive, in the lens tracking process, and in the relay switches. As cheap as CD or DVD recorders are today, I wouldnt even waste the hours of time you are spending on this. get a new one. |
#3
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CD drive magnet problem
GMAN wrote:
Mike Easter I've been experimenting trying to understand what is wrong with my DVD writer tray eject mechanism. As cheap as CD or DVD recorders are today, I wouldnt even waste the hours of time you are spending on this. get a new one. In the beginning, I didn't realize it was an engineering/design flaw problem. -- Mike Easter |
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