Solution found for M2 Pro V7 CD-R booting problem.

[BoarK]

Hi all,

My original post which explains my problem very clearly can be read through this link:

http://www.ps2newz.net/forums/showth...2602#post92602

Further posts on the subject are available if you do a search under the nick BoarK.

Solution:

I resorted to calibrating the cd pot. Upon checking the "factory default" setting I found that the cd/dvd pots were set to 1440 ohms/1660 ohms respectively. These figures are a little high compared to the ones given in charlie_ps2's guide (1220/800). I'm don't know why there is such a big difference in the pot impedances. Never the less, I followed the guideline and reduced the resistance by about 10%, 1306 ohms to be exact. This figure is still way above the one suggested in the charlie's guide. Now, every cd-r boots regardless of the media brand and burn speed. I've even tried non-brand named cd-rs burnt at 16x.

Further problem:

Even though cd-rs boot they do so under the following condition. The ps2 has to be set in its standing position. They refuse to boot if I lay the ps2 flat. Why is this? There is a audible scratching sound every time the drive is reading off the disc. This scratching is very minimal when reading dvd-rs. When the scratching sound is not audible a constant hum from the drive could be heard. This hum is not so loud but it appears like the laser is constantly trying to move beyond its constraints. How can I verify this?

Possible solutions?

Are the behaviours described above a result of the laser not receiving enough power to read the cd-rs properly? Should I reduce the resistance evn further? Should I base the 10% reduction contraint on the 1220 ohms figure given in the guide or should I stick with the original settting of my own laser pot? Could some one with a V7 NTSC verify the "factory setting" of the cd pot?

Any further assistance is greatly appreciated.

BoarK.

[LiquidCell]

on a v7 I had w/ Magic3.1 it would not boot ANYTHING except music on CD-R but ran DVD-R perfectly. Soon after that my friend dropped the ps2 and the whole thing went to shit but I got another v7. This one booted CD-Rs (all of em) perfectly with a DMS3 installed, but guess what, the ps2 had problems reading ANYTHING on DVD, even Originals had problems on this laser. (checked without the chip in on an original). I honestly really hate Sony sometimes, I am getting this ps2 exchanged for a good one (hopefully a good one) soon. That humming and scratchng sound you hear comes from my ps2 on cheap media but I dont get the scratching sound on the Verbatim CD-R dark blue underside but the drive makes alotta humming reading sounds, it gets louder-quiter-louder-quiter over and over again. Try adjusting the pots down still.

[l_oliveira]

You probably got the laser unit coils burnt with the read error problems you were having before. If you insist in unsing that laser you will probably get your BA5815 burn also.
My advice is for you to look for assistance of a pro.
You can check the impedance of the lenses coils with a multimeter on the X1 scale. They should measure arround five OHMs on both coils. There's a pair. One does focusing (Up and down) and the other does tracking (forward and back, on the same direction as the motor that moves the laser) for the lenses.

What damaged your laser coils was the low adjustment you stated before, and you which probably insisted a lot trying to read discs (probably DVDs) with the laser power badly adjusted.

This might be too rough to say "in the face" like I did, but I say that based on the description you gave about your PS2 don't working while laying "flat" on the table. I'll explain why I think your coils are burnt: If the coils are short. the BA will send the same current as usual, but the energy will be converted in heat instead of magnetic propulsion on the lenses. That means the PS2 will have a hard time trying to focus on the groove at the disc. If you have the PS2 on the vertical stand position, the power required to adjust the focusing will be diminished.


I hope this was informative.
Regards.