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Old 13th September 2013, 06:40 AM   #19751
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Default re laser

Quote:
Originally Posted by higlander View Post
Why changed servo ICs and not the Laser unit ?
Tried lasers from known good players and still error 02 laser focuses but no drive on motor.
cheers alan
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Old 13th September 2013, 07:04 AM   #19752
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Quote:
Originally Posted by bikeral10 View Post
Tried lasers from known good players and still error 02 laser focuses but no drive on motor.
cheers alan
Try to adjust the distance of the laser head and the CD disc by slightly adjusting the position of the rotor in the motor spindle. It will solve the issue in many similar occasions that I had encountered in the past.
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Old 16th September 2013, 07:23 AM   #19753
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Has anyone tried altering the filter im sure i read that fitting a couple of styroflex 470pf @ c605/6 made a nice difference? any thoughts.

cheers guys alan
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Old 16th September 2013, 06:02 PM   #19754
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Hi Alan,

I tried that a few times, maybe you've read it here?

470pF will get you close enough. The filter gets a more smooth roll-off and you can hear the difference in the high-end. If the player is not fully tweaked and still sounds a bit harsh, it can be a good tweak to make it sound a bit more friendly. But after my player was decently tweaked, I went back to the original filter to have a bit more 'bite' and detail in the high-end. That was before the DOS entered the room. The passive filter of the DOS can also be changed to Bessel by the way.

Regards,

Ray
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Old 16th September 2013, 06:48 PM   #19755
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Default thx ray

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Originally Posted by 6h5c View Post
Hi Alan,

I tried that a few times, maybe you've read it here?

470pF will get you close enough. The filter gets a more smooth roll-off and you can hear the difference in the high-end. If the player is not fully tweaked and still sounds a bit harsh, it can be a good tweak to make it sound a bit more friendly. But after my player was decently tweaked, I went back to the original filter to have a bit more 'bite' and detail in the high-end. That was before the DOS entered the room. The passive filter of the DOS can also be changed to Bessel by the way.

Regards,

Ray
Yes thats where i saw it, My players quite well tuned clocks recap no dos as yet servo psu opamps many regs so on the way.
thx ray alan
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Old 16th September 2013, 07:19 PM   #19756
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Originally Posted by bikeral10 View Post
Yes thats where i saw it, My players quite well tuned clocks recap no dos as yet servo psu opamps many regs so on the way.
thx ray alan
I am using 330pF and it makes the sound a little bit more smooth. I have read someone used 220pF but its effect is not that noticeable and 470pF will make the HF roll off by a bit too much.
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Old 19th September 2013, 12:55 AM   #19757
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Now that we know the philips chinese lasers are crap, what about adapting the circuit so that we can fit a sony laser!

Last edited by barry.childs; 19th September 2013 at 12:57 AM.
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Old 19th September 2013, 07:30 PM   #19758
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Default re 470uf

Quote:
Originally Posted by 6h5c View Post
Hi Alan,

I tried that a few times, maybe you've read it here?

470pF will get you close enough. The filter gets a more smooth roll-off and you can hear the difference in the high-end. If the player is not fully tweaked and still sounds a bit harsh, it can be a good tweak to make it sound a bit more friendly. But after my player was decently tweaked, I went back to the original filter to have a bit more 'bite' and detail in the high-end. That was before the DOS entered the room. The passive filter of the DOS can also be changed to Bessel by the way.

Regards,

Ray
Tried it had some caps from a german company. Bit too lack luster 470 pf a bit to much,Next may try a dos or valve output have a 6n2 output stage may have go at.
cheers guys alan
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Last edited by bikeral10; 19th September 2013 at 07:36 PM. Reason: mistake
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Old 19th September 2013, 08:41 PM   #19759
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Did you adjust R611/612? You should, this gets the roll-off frequency back to where it should be.

Otherwise, I can recommend the 220pF capacitor between the 10k resistors. This is a very nice tweak to get rid of some 'digitalis'.

Ray
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Old 20th September 2013, 09:00 PM   #19760
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Default re values

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Originally Posted by 6h5c View Post
Did you adjust R611/612? You should, this gets the roll-off frequency back to where it should be.

Otherwise, I can recommend the 220pF capacitor between the 10k resistors. This is a very nice tweak to get rid of some 'digitalis'.

Ray
What value did you use ray?@r611/12,
many thanks alan
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