Laser adjustment on Teac VRDS-10 - how?
Hi all,
I am trying to adjust the laser on the Teac VRDS-10.
So, since I am new to electronics, and I haven't done it before, I am studying the Teac VRDS-10 Service Manual.
Some of it is pretty easy to understand and I have done some tests, and a single adjustment just using my Fluke 179.
There are however some problems as I also need to connect an oscilloscope and adjust accordingly to how the waveform looks.
On the first picture one can see the test points and trimmers.
My first question:
the manual says measure an offset millivolt value of no higher than 50mV on test point 3. There is only one pin at Tp3, so I don't know how to perform that?
And I don't understand the term offset voltage?
Secondly, I also have to connect an oscilloscope plus an external tonegenerator to the player plus a single 100kOhm resistor. See picture.
While I think that the output wires from the tone generator is + and - (gnd) and the + goes to the scope and continues via the 100kOhm resistor to the test point 1, pin 1, and the - (gnd) from the tonegenerator goes from that to the scope ch1, and continue to Test point 1, pin g (gnd), I don't understand the third wire that seems to go from somewhere on the scope to the Test Point 1, pin 2. Is that the output from the cd-player on to the scope? And is that connected to what?
I am trying to learn using the scope Rigol DS1104Z Plus.
I hope you will enlighten me on the matter, so I can perform a full set of laser set up. It is MOST appreciated.
Kind regards,
SFC1000.
Hi all,
I am trying to adjust the laser on the Teac VRDS-10.
So, since I am new to electronics, and I haven't done it before, I am studying the Teac VRDS-10 Service Manual.
Some of it is pretty easy to understand and I have done some tests, and a single adjustment just using my Fluke 179.
There are however some problems as I also need to connect an oscilloscope and adjust accordingly to how the waveform looks.
On the first picture one can see the test points and trimmers.
My first question:
the manual says measure an offset millivolt value of no higher than 50mV on test point 3. There is only one pin at Tp3, so I don't know how to perform that?
And I don't understand the term offset voltage?
Secondly, I also have to connect an oscilloscope plus an external tonegenerator to the player plus a single 100kOhm resistor. See picture.
While I think that the output wires from the tone generator is + and - (gnd) and the + goes to the scope and continues via the 100kOhm resistor to the test point 1, pin 1, and the - (gnd) from the tonegenerator goes from that to the scope ch1, and continue to Test point 1, pin g (gnd), I don't understand the third wire that seems to go from somewhere on the scope to the Test Point 1, pin 2. Is that the output from the cd-player on to the scope? And is that connected to what?
I am trying to learn using the scope Rigol DS1104Z Plus.
I hope you will enlighten me on the matter, so I can perform a full set of laser set up. It is MOST appreciated.
Kind regards,
SFC1000.
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