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Old 14th December 2012, 10:58 AM   #31
nuryev is offline nuryev  Australia
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Sorry guys - I took readings for voltages from both the cd drive motor and the laser tracking motor - had these mixed up in the initial posting.

I did notice that when the audio cuts out the trend was laser tracking voltages go up to 0.16v while cd player drive motor voltage drops to below 4v to 3.8v.
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Last edited by nuryev; 14th December 2012 at 11:08 AM. Reason: omitted additional information
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Old 14th December 2012, 11:07 AM   #32
nuryev is offline nuryev  Australia
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If I wanted to check 'eye patterns' where would the most reliable 'ground' point for the scope to be.
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Old 14th December 2012, 11:26 AM   #33
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by nuryev View Post
Correction and apologies - the voltages recorded above were for the cd drive motor.

The laser motor voltages appear to fluctuate between 0.004v and 0.054v during normal play.
However, as Moolly suspected the voltage jumped to 0.12 and then 0.16v followed by audio cut out.
That could point to a sled problem. The only way to really clean these is to remove the gears and wash them and clean all the old grease out of the teeth with some card or paper. Same for the rack on the laser. The soft blue nylon gear can suffer with burrs on the inner teeth.

The best ground is the one used by whatever chip is used to process the RF signal (the one on the main PCB).
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Old 14th December 2012, 11:32 AM   #34
nuryev is offline nuryev  Australia
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Default sled problem

I will try using the scope and then take the mechanism apart. I have done this before but was not aware that all the gears could be removed?

I will need to work in daylight though as the eyes are not what they used to be.

Will keep you posted.
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Old 14th December 2012, 11:37 AM   #35
Mooly is offline Mooly  United Kingdom
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You have to remove the metal clip over the sled motor (just pops off) and then the motor complete with worm gear can be removed. That allows the blue gear to be removed (its just a push fit but be careful not to damage it).
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Old 14th December 2012, 12:08 PM   #36
nuryev is offline nuryev  Australia
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Default laser mechanism gears

OK! mechanism disassembled. Only see white gears no blue. How do i remove the laser assembly? to get to the gears?
Attached Images
File Type: jpg tn_cd63laser top view.JPG (155.7 KB, 53 views)
File Type: jpg tn_cd63laser.JPG (136.1 KB, 50 views)
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Old 14th December 2012, 12:18 PM   #37
Mooly is offline Mooly  United Kingdom
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The white gears don't suffer from the burrs unless they have been damaged. But they can suffer debris in the teeth.

You have to pop that clip off the sled motor. Its just sprung in place. Access at the top via two slits in the chassis. The white gear pulls off. Look carefully at the top of the gear and you'll see two "clips" molded into the gear that locate in a groove in the metal shaft the gear fits on. It is just a push fit but may need a bit of persuasion to be eased out.

Before you pull the white gear off try turning it by hand. It should be free (although I wouldn't call it smooth) to turn with no obvious sticking points.

The laser istself can be left on its rail although its easy to remove and refit (if a bit fiddly) if needed.
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Old 14th December 2012, 12:47 PM   #38
nuryev is offline nuryev  Australia
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Default laser parts

got it all taken down - finicky, but not too difficult.

Pics of the parts are attached.

Pics are attached - is isoproponal a suitable cleaner?
Attached Images
File Type: jpg tn_laser lens.jpg (141.6 KB, 47 views)
File Type: jpg tn_laser rack.JPG (142.7 KB, 47 views)
File Type: jpg tn_Plastic gear.JPG (77.0 KB, 47 views)
File Type: jpg tn_rail1.JPG (91.1 KB, 10 views)
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Old 14th December 2012, 01:02 PM   #39
Mooly is offline Mooly  United Kingdom
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Thats it

ISO's fine to clean them. Use card to run through all the teeth to get the gunge out.
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Old 14th December 2012, 01:18 PM   #40
nuryev is offline nuryev  Australia
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Default dismantled

finally managed to dismantle the mechanism. Pics are attached - is soaking in isopropyl ok or will it be detrimental to the plastic?
Attached Images
File Type: jpg tn_laser lens.jpg (141.6 KB, 7 views)
File Type: jpg tn_laser rack.JPG (142.7 KB, 0 views)
File Type: jpg tn_Plastic gear.JPG (77.0 KB, 0 views)
File Type: jpg tn_rail1.JPG (91.1 KB, 0 views)
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