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Old 15th February 2013, 09:54 AM   #71
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Quote:
Originally Posted by Salar View Post
There is no arc. The laser optics sit on a pole and are driven horizontally/vertically by coils for fine trackment and focus.
Is it? Good that u r also teaching while asking for help.

Gajanan Phadte
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Old 15th February 2013, 10:07 AM   #72
Salar is offline Salar  Germany
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Dear Gajanan, show me what you mean with "arc", Iīd loved to be teached :-)

What I found out this morning:
I did warm up the player with a hairdryer , not much, especially (but not only) the area close to the KSS-274 laser.
No jumping, (as expected, like with earlier tests )
So maybe the laser is prone to cold but iīll have to repeat this tomorrow (Donīt heat my house during the night)

So tomorrow I will only warm up the laser and try to keep other parts cold.
A freezer spray might not help, because it could produce residues in the laser.
Donīt think it is a weak diode, because this problem exists from the beginning.
Could be a sticky pole.
As far as I understand BA6297AFP drives also the KSS coils and is connected directly to them.
So probably no bad engineering there.
All the best,
Salar

Last edited by Salar; 15th February 2013 at 10:14 AM.
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Old 15th February 2013, 03:25 PM   #73
dacen is offline dacen  Norway
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Well the player has started to fail on power up again. I am going to put back the 330 ohm (JW 600) as this is obviously not causing this problem. The next step is to try to increase the power on reset timing. This is to give the powersupply more time to reach the desired output before the digital circuits are enabled. Increase C697 to around 6-7uF pin 4 IC691.
Power on reset. I will certainly advice when I know the outcome of this modification.
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Old 15th February 2013, 03:32 PM   #74
Salar is offline Salar  Germany
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Great! I will keep 10ohm and warm up the laser tomorrow morning prior to switching on in order check wether the laser is prone to cold...
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Old 15th February 2013, 08:47 PM   #75
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Quote:
Originally Posted by gmphadte View Post
Is it? Good that u r also teaching while asking for help.

Gajanan Phadte
Like this...four pole pieces, inner pair with vertical coils for focus, outer pair with four horizontal coils for fine tracking. Black bits, coils and laser move in relation to silver and gold-coloured bits. Between the two, the white lump of plastic is a parallelogram pivot/spring for vertical movement, and a lightly sprung pair of pivots for the lateral. It's not ovbious how the tracking movement is held to a parallelogram, but I guess there must be a guide pin somewhere.

Strictly speaking, although the driving force is linear, movemement is in arcs. Note the Toshiba in my Avatar is lighter, cheaper, and much more elegant, with a much better two-axis plastic spring.

Pic is of KSS190A, but I think other Sonys are similar.
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File Type: jpg SonyHeadComp.jpg (299.8 KB, 48 views)

Last edited by PlasticIsGood; 15th February 2013 at 08:56 PM.
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Old 16th February 2013, 10:15 AM   #76
Salar is offline Salar  Germany
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Good old times - KSS-123A from 1987. No plastic.
One of my best trackers is a Toshiba XR-Z70.
Made my test, heating only the laser for 15 seconds. Of course the heat gets into the CDP-X5000īs cabinet, but the CD-compartment (made of metal) was cold to the touch again after another 15 seconds.
No skipping.
So maybe the laser is prone to cold...
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File Type: jpg KSS-123A_Photograph_from_1987.jpg (495.6 KB, 43 views)
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Old 16th February 2013, 12:30 PM   #77
Mooly is offline Mooly  United Kingdom
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I've had one case (KSS210) where the centre bearing was "sticky". If that is a problem then its difficult to correct because the lens suspension is a synthetic neoprene type contraption and is easily damaged if you try and detach it from under the lens in order to lift it clear. I suppose you could try "washing" it through with single drops of ISO on the centre shaft.

Unless that is the problem it would be easy to make things worse.
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Old 16th February 2013, 12:47 PM   #78
Salar is offline Salar  Germany
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Hmm - sticky in horizontal movement only, with rythmical clicks every 2seconds, and by reaching about 30 degrees centigrade, stickyness is gone...
Shouldnīt be the clicking more erratic if the pole piece was sticky?
And independent of temperature?
All the best,
Salar
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Old 16th February 2013, 12:52 PM   #79
Mooly is offline Mooly  United Kingdom
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I wouldn't like to say really, not without seeing what is happening. It was just seeing that picture of the pickup that reminded me.
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Old 16th February 2013, 12:59 PM   #80
Salar is offline Salar  Germany
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Yes, I was told once, the KSS-123A could become sticky as well.
BTW, for those interested, those pole pieces are NEVER - and should never - be lubricated.

But there is a transistor 2SB1013 on the KSS-274, maybe this is the source of fault...

Last edited by Salar; 16th February 2013 at 01:10 PM.
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