V12 lens pot resistances.

[netriones]

I changed my v12 lens and found out my new laser has different pot values than the oringinal lens.
My old lens(PVR-802W):
CD: 354 ohms
DVD:900 ohms

New lens(PVR-802W):
CD: 250 ohms
DVD: 780 ohms


Should I adjust the new lens pot value to the old values? Because I am worry about with a lower resistance, there'll be a greater current going through the diodes.

[yahooadam]

I changed my v12 lens and found out my new laser has different pot values than the oringinal lens.
My old lens(PVR-802W):
CD: 354 ohms
DVD:900 ohms

New lens(PVR-802W):
CD: 250 ohms
DVD: 780 ohms


Should I adjust the new lens pot value to the old values? Because I am worry about with a lower resistance, there'll be a greater current going through the diodes.

as long as u still have a fix, i dont see the problem, plus those pot values may have killed ure original laser ... so u know

just see how it works i guess, with a decent fix

[yahooadam]

just saw this thread - you might wanna read thru it (i cba really seeing as i dont intend on ever getting a v12)

[netriones]

just saw this thread - you might wanna read thru it (i cba really seeing as i dont intend on ever getting a v12)

What? Where is it?

[yahooadam]

What? Where is it?

lol sorry forgot to put up the link
http://www.ps2newz.net/forums/showthread.php?t=36259

[pstwo4u]

The resistence of the pots determines the amount of current which goes to the CD/DVD laser beams.
Some laser needs more current to produce the same amount of light.
This is not because of production instabilities, but I do think due to the excessive amount of current to put through the lasers, this to reduce its lifetime.
With doing that it reduces the lifetime, and thus selling more of them.
It's how Philips shortens its lifetime of light bulbs, in order for people to buy more light bulbs in their lifes.

By this method, every new ps2 laser wafer is different. Some produce much more light than other. In other words how higer the resistence in the beginning of a new laser, the better the quality is.

You know that 10 years ago, the lifetime of a CD player, was much higher than now.
The lifetime of a CD player of 10 years old, could be 10 year.
From now, the lifetime has been shortened, until 4-5 years by putting too much current through it to reduce its lifetime.

When you buy 20 new Pstwo laser, and you plan to sell the other 10.
Then you have to measure the pstwo laser DVD pots, and keep the ones with the highest resistence, and sell the ones with the lowest resistence.

[netriones]

It's very weired. No matter I set the pot high or use original value. The PsTwo will only reads DVD +R and CDs perfectly! IT doesn't read any other kinds of disk: Original games, DVD movies,DVD -R. None will work(DIsk cannot be read). Any idea? Bad laser?

[yahooadam]

It's very weired. No matter I set the pot high or use original value. The PsTwo will only reads DVD +R and CDs perfectly! IT doesn't read any other kinds of disk: Original games, DVD movies,DVD -R. None will work(DIsk cannot be read). Any idea? Bad laser?

is ure ps2 chipped

you may have to press a button to enter a certain mode if it is

[netriones]

IT's DMS 4 lite.

[pstwo4u]

In the factory the laser will be calibrated with original disks.
The reflection coating of an original disk, is better than recordables.

This means that when you increase the pot resistence of a new lens, less power will go to the laser diode, and thus in some occasions, you would have problems with reading disks.
The chance that you cannot read certain recordables anymore, is bigger, than you cannot read originals anymore.

But decreasing the pot resistence of a new lens, more power will be send to the DVD laser diode, and the receiving sinus signal could clip.

So always keep the resistence the same of new lensen.
Only adjust it with a reason.

With the SPU lens it is advised to increase the resistence, to increase it's lifetime of the DVD laser diode.
When you have played lot of time (years) with the ps2, and it has difficulting reading the disks, then:

1) Clean the lens with a cleaning disk
2) Clean the lens with alcohol
3) Copy the backup game when it has scratches on it (for example on Fuji)
4) At last point, decrease the resistence of the pots, in steps of 5%.
No more than 20% decreasing the resistence value, or it will die the (DVD) laser diode