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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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CDROM repair tip
My trusty Toshiba SCSI CDROM drive recently started spitting out any
disc it was asked to load after 3-4 seconds. Took it apart and found the plastic tray drive gear had cracked - small one, on the motor spindle, ~5mm diameter. It's a press-fit on the spindle, and apparently still had enough grip to open and close the tray, but let go when the additional load of lifting the laser head sled into place was applied. I went looking for super glue, but it was all dried up as usual - even the one in the fridge. I've been known to tackle the odd plumbing job, so when I found a bottle of "PVC to ABS transition solvent cement", I couldn't resist trying it. I opened one end of the cracked gear about 0.5mm with a razor blade, poked cement into the crack with a needle, squeezed it between two fingers for a couple of minutes, then cleaned off excess cement with the needle. The repaired gear was a tight fit on the spindle, but did not crack again. CDROM now works perfectly :-) Sunny |
#2
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a friend of mine has got a samsung cd-rw drive
and it opens a shuts when it wants to could it be the same as yours or the tray switch mybe faulty. john "Sunny" wrote in message ... My trusty Toshiba SCSI CDROM drive recently started spitting out any disc it was asked to load after 3-4 seconds. Took it apart and found the plastic tray drive gear had cracked - small one, on the motor spindle, ~5mm diameter. It's a press-fit on the spindle, and apparently still had enough grip to open and close the tray, but let go when the additional load of lifting the laser head sled into place was applied. I went looking for super glue, but it was all dried up as usual - even the one in the fridge. I've been known to tackle the odd plumbing job, so when I found a bottle of "PVC to ABS transition solvent cement", I couldn't resist trying it. I opened one end of the cracked gear about 0.5mm with a razor blade, poked cement into the crack with a needle, squeezed it between two fingers for a couple of minutes, then cleaned off excess cement with the needle. The repaired gear was a tight fit on the spindle, but did not crack again. CDROM now works perfectly :-) Sunny |
#3
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I wouldn't expect it to keep working. Maybe grab a similar gear off some
other unit. Mark Z. "Sunny" wrote in message ... My trusty Toshiba SCSI CDROM drive recently started spitting out any disc it was asked to load after 3-4 seconds. Took it apart and found the plastic tray drive gear had cracked - small one, on the motor spindle, ~5mm diameter. It's a press-fit on the spindle, and apparently still had enough grip to open and close the tray, but let go when the additional load of lifting the laser head sled into place was applied. I went looking for super glue, but it was all dried up as usual - even the one in the fridge. I've been known to tackle the odd plumbing job, so when I found a bottle of "PVC to ABS transition solvent cement", I couldn't resist trying it. I opened one end of the cracked gear about 0.5mm with a razor blade, poked cement into the crack with a needle, squeezed it between two fingers for a couple of minutes, then cleaned off excess cement with the needle. The repaired gear was a tight fit on the spindle, but did not crack again. CDROM now works perfectly :-) Sunny |
#4
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D MARSHALL wrote: a friend of mine has got a samsung cd-rw drive and it opens a shuts when it wants to could it be the same as yours or the tray switch mybe faulty. In my case the tray switch wasn't activated because the laser head never lifted into the play position. Sunny john "Sunny" wrote in message ... My trusty Toshiba SCSI CDROM drive recently started spitting out any disc it was asked to load after 3-4 seconds. Took it apart and found the plastic tray drive gear had cracked - small one, on the motor spindle, ~5mm diameter. It's a press-fit on the spindle, and apparently still had enough grip to open and close the tray, but let go when the additional load of lifting the laser head sled into place was applied. I went looking for super glue, but it was all dried up as usual - even the one in the fridge. I've been known to tackle the odd plumbing job, so when I found a bottle of "PVC to ABS transition solvent cement", I couldn't resist trying it. I opened one end of the cracked gear about 0.5mm with a razor blade, poked cement into the crack with a needle, squeezed it between two fingers for a couple of minutes, then cleaned off excess cement with the needle. The repaired gear was a tight fit on the spindle, but did not crack again. CDROM now works perfectly :-) Sunny |
#5
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Mark D. Zacharias wrote: I wouldn't expect it to keep working. Maybe grab a similar gear off some other unit. I'll post again if it breaks. I recently retrieved a couple of identical units from a dumpster, so there's no shortage of parts :-) Sunny Mark Z. "Sunny" wrote in message ... My trusty Toshiba SCSI CDROM drive recently started spitting out any disc it was asked to load after 3-4 seconds. Took it apart and found the plastic tray drive gear had cracked - small one, on the motor spindle, ~5mm diameter. It's a press-fit on the spindle, and apparently still had enough grip to open and close the tray, but let go when the additional load of lifting the laser head sled into place was applied. I went looking for super glue, but it was all dried up as usual - even the one in the fridge. I've been known to tackle the odd plumbing job, so when I found a bottle of "PVC to ABS transition solvent cement", I couldn't resist trying it. I opened one end of the cracked gear about 0.5mm with a razor blade, poked cement into the crack with a needle, squeezed it between two fingers for a couple of minutes, then cleaned off excess cement with the needle. The repaired gear was a tight fit on the spindle, but did not crack again. CDROM now works perfectly :-) Sunny |
#6
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Nice repair tip!
I like the use of the PVC glue. Thanks................. "Sunny" wrote in message ... My trusty Toshiba SCSI CDROM drive recently started spitting out any disc it was asked to load after 3-4 seconds. Took it apart and found the plastic tray drive gear had cracked - small one, on the motor spindle, ~5mm diameter. It's a press-fit on the spindle, and apparently still had enough grip to open and close the tray, but let go when the additional load of lifting the laser head sled into place was applied. I went looking for super glue, but it was all dried up as usual - even the one in the fridge. I've been known to tackle the odd plumbing job, so when I found a bottle of "PVC to ABS transition solvent cement", I couldn't resist trying it. I opened one end of the cracked gear about 0.5mm with a razor blade, poked cement into the crack with a needle, squeezed it between two fingers for a couple of minutes, then cleaned off excess cement with the needle. The repaired gear was a tight fit on the spindle, but did not crack again. CDROM now works perfectly :-) Sunny |
#7
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Sometimes just to be safe, when I do this, I power up the motor seperately
with 9-12Vdc and while it runs, I hit the shaft a bit with some metal sandpaper - just to knock off a little bit of the interference fit on the plastic. I find it usually lessens the chance of the same pressure being applied again, which was most likely the cause of the original crack. It also lessens the chance a bit of seeing the repair open up again. Its good also if you can place the pulley in a C-clamp or a pana-vise after you apply the mending compound. | The repaired gear was a tight fit on the spindle, but did not crack | again. CDROM now works perfectly :-) |
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