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Old 8th September 2007, 10:29 PM   #1
delory is offline delory  United Kingdom
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Join Date: May 2005
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Default Disk Needs Help Spinning

Hi guys,

I know I've seen a similar problem on here somewhere, but... just been playing around with a Nad C540 player which seems to be having a problem spinning the disk. I've replaced the laser (Sanyo SFP101) and when you press play, the drawer closes, laser tracks, but disk does not spin.

I checked the motor was ok (with a battery) so when the drawer closed and laser came up, I gave the disk a little helping hand and spun it with my finger. And up came the TOC!

So I'm guessing the problem is either with the motor, or the power to the motor? Would I be right? Any help would be appreciated.

Regards.
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Old 10th September 2007, 02:29 AM   #2
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Make sure that the vertical placement of the mechanism is not obstructing the spindle-motor free spinning. In other words, make sure that the 4 springs are properly seated around rubber "distancers" and the screws are fully tightened.

I can tell that you eventually got TOC, but I'll ask anyway: did you remove the static-protective solder blob from the laser pick - up? (you probably didÖ. didnít you?)

Good luck

Boky
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Old 10th September 2007, 03:01 AM   #3
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Sounds very likely that you just need to spray a bit of silicone-based spray lubricant into the bottom end of the platter motor.
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Old 14th September 2007, 04:13 AM   #4
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If the motor keeps spinning after you start it with your finger, then I'd guess one phase of the motor driver chip is blown. Replace the chip. (I'm assuming the spindle motor is a brushless DC motor)
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Old 14th September 2007, 07:37 PM   #5
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If it is a brushed motor (typically a tiny mabuchi thingy, only 2-wire connection), then the commutator may simply be dirty/worn. Since the typical runnng voltage is only a volt or so, maybe 3v to start, they can get quite 'sticky' with age. Pushing to start it robably just gets it to a cleaner segment.

The easy fix is usually just to de-solder the two wires to the motor, and 'buzz' it on 9v each way for s few soconds. Lubricate, replace wires, try again.
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