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Old 19th June 2013, 09:06 PM   #1
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Default Sony KSS 165 A

My discman SONY D 250 bought in the 80's has some trouble : CD is turning, optical block is moving , lense is gowing up and down but after few seconds CD stops. I think the system cannot focus because the laser beam is too weak.
Tjhe optical block is a KSS-165A.
Does somebody know where I can buy that item ?
If it is obsolete, is it possible to change only the laser diode itself ?
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Old 19th June 2013, 11:35 PM   #2
SonyES is offline SonyES  United Kingdom
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From what I have seen and asuming that the part number is 8-848-096-11 looking on encompass parts there is a substitute/alternative part of 8-848-162-11 Kss-221a.
found one here OPTICAL PICKUP KSS221A/165A [KSS221A/165A] - US$20.00 : Alltronic, One Stop Online Shopping
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Old 20th June 2013, 04:08 PM   #3
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I have already asked Alltronic but that item is no more available.
Anyway thank you for your quick answer.
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Old 20th June 2013, 08:20 PM   #4
SonyES is offline SonyES  United Kingdom
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Have you tried tweaking the pot on the back of the optical block, marking first your start point then trying different settings, also a deep clean of the lens might help a little.
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Old 21st June 2013, 06:26 PM   #5
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Here attached some pictures of theKSS165A. The "pot" you mean is it that one circled in red on the 2nd picture ?
Attached Images
File Type: jpg KSS165A_pic1.jpg (344.0 KB, 48 views)
File Type: jpg KSS165A_pic2.JPG (146.9 KB, 48 views)
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Old 21st June 2013, 11:23 PM   #6
SonyES is offline SonyES  United Kingdom
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That is indeed the one
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Old 23rd June 2013, 12:27 PM   #7
Mooly is offline Mooly  United Kingdom
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The last three digits of the pickup serial number show the correct (original) current. Is it 419 ? That would be 41.9 milliamps and is checked by measuring the volt drop across a resistor in the laser power circuit on the main PCB and calculating the current. If it is higher than stated by 10% or more then the laser has deteriorated.
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Old 23rd June 2013, 03:36 PM   #8
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Yes it is 419. I checked the current - as stipulated in the service manual - and I found 41.7 mA which is inside the tolerance (41.9 +/- 10 percent). Therefore the laser diode seems to be OK but - compared to another CD player - the laser beam is very weak.
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Old 23rd June 2013, 04:09 PM   #9
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On the picture the laser beam of a DVD/CDplayer is clearly defined. But the laser beam of my discman D-250 is practically unvisible. If the laser is OK what could be the reason of the weakness of the beam ?
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Old 23rd June 2013, 04:10 PM   #10
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Oups I forgot the laser picture...
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File Type: jpg Laser beam.jpg (308.9 KB, 41 views)
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