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Laser Adjustments: KSS-151A in TEAC VRDS-10 vs TASCAM CD-401 MkII
Laser Adjustments: KSS-151A in TEAC VRDS-10 vs TASCAM CD-401 MkII
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Old 20th April 2019, 04:29 PM   #1
Malefoda is offline Malefoda  France
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Default Laser Adjustments: KSS-151A in TEAC VRDS-10 vs TASCAM CD-401 MkII

Hi guys,

I adjusted my VRDS-10 years ago and it still works flawlessly.
Owner of a spare player, a TASCAM CD-401 Mk II with a KSS-151A laser, I've looked for the FSM in vain. I've decided to use the VRDS-10 FSM, as the servo circuit seems to be the same. ICs and TP are the same.

All the adjustments can be done properly, they all match and behaviour like in the VRDS-10 but the Focus Gain only. Tracking Gain is fine.
When OK, the signals measured from the player are -90 phase shift. Sounds a bit odd as in the FSM just say a "phase is 90" but works fine, guess they want a 90 between and that's all.
But no way for the FG in the TASCAM, 90 can be achieved by the pot turned in full, nonsense for a pot, and then the player is noisier than a jet plane but works fine anyway. That's not the proper adjustment. The only way to get it at the point it just become silent is when I look for a 45 phase shift. Or said in another way, somewhere with the pot closer to the middle, if I choose 45 (a pure guess) then it's quite silent and works fine. A tad "less" pot turning and it becomes noisy (one can hear the sine wave injected), a bit "more" and it will spins like crazy.

FSM, tech tips or experience to share anyone?

edit: I have played with toys and once things went right, don't know why, maybe the signal gen (cheap eBay thing), maybe the player (setting or such with power on/off?) maybe the scope... user!
If any idea I'll have a look, else I'll check again to see what (who) went wrong and that's it
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File Type: png Capture décran 2019-04-20 à 17.45.05.png (82.3 KB, 40 views)
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Last edited by Malefoda; 20th April 2019 at 05:40 PM.
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