Proof-of-"$ony fixed Laser Coils burning Issue in V13" Test results included with Kit

**wmb88** · 07-27-2005,10:31 PM

Originally Posted by ShadowKnyght

hmmm maybe that suggests that DVD+R have a lower reflective index and as such are more likely to wear out your laser, I would tune for -R and just not use your +R disks, would be safer that way. 1000 ohms is about factory setting for the wide lasers so you have not gained much by leaving it there.

1400 was probably a bit high and with a little dust on the lens and variation in quality of DVD-R media you may have eventually started having reading problems and needed to open up again. I would have left it at around 1200 if that worked fine for all media except +R

i did not test dvd+r but dvd+r dl (dual layer) coz i don't have dvd+r at the time.

**eMaNoN** · 07-28-2005,12:23 AM

do i need a fix for v13....?
slimfix or just adjust the dvd pots...?
cuz im confuse whether adjusting pots will able to fix the diode burn problem...

**anarchy2007** · 07-29-2005,09:01 AM

Please bare with me on this one since my first language is not English. I will try explain my theory as best possible. Keep in mind that this only a theory. "EDIT" This would not apply if the lens was damaged by a mod-chip or from dropping the console "END EDIT"

Theory:
Most "v12 Fixes" play a big role in damaging the DVD diode on the optic (lens) unit. Any fix that limits voltage or changes the impendance on the Focus or Tracing coils (diode, etc) causes the gain on the DVD diode to go higher in order to spot a disk properly. When the gain goes to high it will pop the DVD diode.

Example:
Focus and Tracking coil = Magnifying glass
Sun Beam = DVD diode (laser beam)

A lens in principal works almost the same as a magnifying glass with a sun beam passing thru it. Let us say you want to burn a piece of paper with a magnifying glass and a sun beam, you would simply move the magnifying glass closer or further away from the paper to get the most concentrated part of the beam on the surface of the paper. Now limit the distance that the magnifying glass can be moved closer or futher away from the piece of paper. What would happen now is that you will not allways be able to get the most concentrated part of the beam on the surface of the paper, thus not allowing you to burn the paper as efficiently as without the limitations of movement to and from the paper.
Once the movement is limited, the only way to burn the paper more efficiently would be to strengthen the sun beam that is being shun thru the magnifying glass.

What this means;
When a limitation is placed on the focus and tracking coil, the gain on the DVD diode has to increase to accomidate the lack of performance from the coils. "EDIT" Thus increasing the chanses of the DVD diode popping. "END EDIT"

Last but not least, I am a qualified technician and have been one for the past 9 years. I am not an electronic engineer and there are many people out there that know a hell of a lot more about this subject than me. This is mearly my theory.

**ingsebastian** · 07-30-2005,07:06 PM

Originally Posted by anarchy2007

What this means;
When a limitation is placed on the focus and tracking coil, the gain on the DVD diode has to increase to accomidate the lack of performance from the coils. "EDIT" Thus increasing the chanses of the DVD diode popping. "END EDIT"

I think you are right

Bye

LukeSky · 07-30-2005,08:26 PM

Here's a picture of the laser unit with the original values.

LukeSky · 08-01-2005,02:57 PM

Hi again.

v13 PAL (GH-032-1 3 mobo), DUO2 with ICE Revolution, NO fixes, DVD resistor in 1265 ohm (original 893 ohm), working fine for 5 hours continous.

**sunny** · 08-07-2005,05:55 PM

Thanks for the test results Automan....keep up the good work.

**comsoft** · 08-08-2005,04:27 AM

Originally Posted by automan

Summ0ne...known for his economical tips

...gave me the plausible tip some weeks ago and it's the BEST way to protect the laser diode...under the laser there are 2 little Pots...just turn the DVD Pot a bit anticlockwise ! In metric i turn it one millimeter...in inches it is 0.040...it limits the maximum current comes from the AGC...from 2 months back i didn't get back any pstwo with a dead laser diode...

again, it's not fair taking credit on somone elses idea.

this solution of addjusting the POT to save the diode was my idea for the first place.

here is only one link of many i've posted:

http://www.psx-scene.com/forums/show...4&page=4&pp=15

good day

**wmb88** · 08-08-2005,09:54 AM

increasing the pot resistance could protect the diode but the laser might end up being picky with media. it's almost common sense if you know how the laser pick-up assembly works in theory. they are generally all the same from cd players to dvd players. maybe the credit should go to Sony/Philips who invented the cd player more than 20 years ago.

**summ0ne** · 08-11-2005,09:19 AM

adjusting the pots has been around since the ps1 and before - and it was commonly known that if you lower the resistance you get better performance but shorten the lifetime drastically.

now it is the other way around.

i still think it is not worth doing it as an installer - as much time as it takes me to replece the 1% of lenses... it saves me time as i dont have to screw around with the pots and god forbid someone calling me up and saying that some backups work on a ps2 he got elsewhere and do not on the 1 i modded.

as long as its in the range of 1% its all good

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