Hei !
I have Technics SL-P999. Disc spin but not read !
What could be wrong ? Could it be a laser error ?
Thanks !
I have Technics SL-P999. Disc spin but not read !
What could be wrong ? Could it be a laser error ?
Thanks !
Well, a PM in this forum would be a starting point good as any other 🙂
But regarding this player it would be nice to continue the discussion in public, once started so...
Started wondering about the opamps in the "deglitch amplifier" and found this description:
https://audio-database.com/TechnicsPanasonic/player/sl-p999-e.html
"A silent deglitch circuit is mounted to improve the S/N ratio for small signals.
By fixing the deglitch circuit (sample-and-hold circuit), which removes the glitch noise generated during bit switching of the D/A converter, in the sample mode when a small signal is generated (-12dB or less), the problem of switching noise generated by the deglitch circuit itself, which prevents the reproduction of small signal, is solved.
The sample-and-hold circuit, buffer amplifier -hold circuit, buffer amplifier and headphone amplifier. classAA
In classAA, voltage control and current drive, which were conventionally performed by a single amplifier, are shared by two different amplifiers. By enabling faithful waveform transmission that is less affected by load, low distortion and high resolution in the mid-range and high range are achieved."
Is this deglitch noise really a problem or is it a marketing hype and the stage can be bypassed without noticing change in sound?
https://audio-database.com/TechnicsPanasonic/player/sl-p999-e.html
"A silent deglitch circuit is mounted to improve the S/N ratio for small signals.
By fixing the deglitch circuit (sample-and-hold circuit), which removes the glitch noise generated during bit switching of the D/A converter, in the sample mode when a small signal is generated (-12dB or less), the problem of switching noise generated by the deglitch circuit itself, which prevents the reproduction of small signal, is solved.
The sample-and-hold circuit, buffer amplifier -hold circuit, buffer amplifier and headphone amplifier. classAA
In classAA, voltage control and current drive, which were conventionally performed by a single amplifier, are shared by two different amplifiers. By enabling faithful waveform transmission that is less affected by load, low distortion and high resolution in the mid-range and high range are achieved."
Is this deglitch noise really a problem or is it a marketing hype and the stage can be bypassed without noticing change in sound?
Coming back to the previous topic. At the moment, the thing was resolved so that if you turn on the machine and wait for 3 to 4 minutes, it reads the disc and plays without problems. Since my own knowledge of electronics is in the late 80s, I know little about laser players, so does anyone have any advice on how to proceed with this problem?
Thanks, Meelis.
Thanks, Meelis.