problem with diodes on DVD burner

thesk8nmidget · Jul 31, 2008

well i went to harvest the diodes on my dvd burner i picked up today and i got them both out harvested one of them and then realized both had 3 pins????

so how do i tell them apart without putting power to them?? (im still waiting on my driver)

i snapped a picture of the sled and where the diodes were.

also one diode has a thicker filter (the plastic like thing in front of the diode) not sure the exact term.

cant post links yet...
i266.photobucket.com/albums/ii246/thesk8nmidget/Laser%20Scanner%20Project/DSCF7293-2.jpg

thanks in advanced

pseudolobster · Jul 31, 2008

http://i266.photobucket.com/albums/ii246/thesk8nmidget/Laser Scanner Project/DSCF7293-2.jpg

I dunno.. It's hard to say which is which by where they are on the sled... each burner is laid out differently.

Could you take some close-up pictures of the diodes themselves?

You should be able to attach your pictures to your post using the "browse" button below.

thesk8nmidget · Jul 31, 2008

i would gladly do that but my camera is garbage up close it would just be a blurry mess it is a NEC player if that matters.

model-ND-1300A

daguin · Jul 31, 2008

Are they both "closed" can or is one "open" can? If they are still in their heat sinks, can you see a silver part with a hole in it or do you see brass, inside the heat sink?

Peace,
dave

[highlight]**EDIT** [/highlight]Which model NEC player?

pseudolobster · Jul 31, 2008

If you have a digital multimeter and it has a diode testing mode, you can use that to check... the red one will light up red, the IR will barely light up at all, but will have a dim reddish glow.. DO NOT point them into your eyes, the IR one will be giving off much more light than you can see.

The way this works is the multimeter must send a voltage through the diode to check it, and it will always try to send the lowest voltage it can.. ensuring your laser shouldn't be killed in the process.

pseudolobster · Jul 31, 2008

in my experience IR diodes are usually windowless, and are more likely to have a shiny steel can, whereas reds will have a window on them and have a dull gray can.

Oh, and that's a 4x/2x burner, you're not going to get much out of it by the way...

thesk8nmidget · Jul 31, 2008

the #1 was also in a much better heatsinked setup than the other.

#1 also had tow layers of heatsinking and the layers were screwed into one another.

thesk8nmidget · Jul 31, 2008

sorry for the stupid question but how do you tell if one is open can or closed can?

daguin · Jul 31, 2008

thesk8nmidget said:
sorry for the stupid question but how do you tell if one is open can or closed can?

If what pseudo said is true, this question is moot. It won't be an open can anyway. Is this a 4X/2X burner?

Peace,
dave

thesk8nmidget · Jul 31, 2008

so i tore the sled all apart to see the workings and it seems like possibly (just kinda a guess)

but there were two pbs cubes and they were made to make the two 3 pin diodes combine.. now on the other side of the sled there was what i think was a another sort of diode ( it was flat) and shining into a mirror to go to the lense in the center. is it possible that both these are red?

ArRaY · Jul 31, 2008

The one with the rectangular transparent thingy in front is most likely the IR diode.
I have some NEC´s lying around, and I have yet to encounter an IR diode without that grating...

If the flat thing is like green or so with some kind of window and many connections, it is a photodiode ment to read the dvd/cd

ArRaY

sk8er4514 · Aug 1, 2008

I think #1 is the red diode, #2 is IR. this is based on experience with a few different dvd burners and the location of where they are on the sled. i haven't used a NEC burner and i know it varies sled to sled, so this is my educated guess.

Glaserfan · Aug 1, 2008

An NEC 1300A is a 4X burner(I have one here in my old PC).. Very low powered diode. I can't say I know what power exactly it'll put out but I would guess not much more than 100mW at ? mA. It is hard to tell which diode is which. My guess is the red will be the closest one to the objective lens along the light path.

thesk8nmidget · Aug 11, 2008

yeah i checked it out. very low power so i junked played around with it for a while and then just continued to practice soldering the small leads.

teddy981 · Aug 22, 2008

i have the same problem one of my diodes has like a clear lense or something over it
over it and the other does not any ideas?
is what i see a window?

diachi · Aug 22, 2008

Yeah thats the window , the other one has probably had the window knocked in if it doesn't have one .

problem with diodes on DVD burner

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