On Mon, 24 Mar 2008 00:30:22 GMT, "Arfa Daily"
wrote:
"Jeff Liebermann" wrote in message
.. .
On Sun, 23 Mar 2008 05:54:54 -0400, "Eric Cire"
wrote:
I'm thinking of opening up my old Playstation 2 console as I get constant
"disc read error" and so been looking at this repair guide video and
noticed
on top of the Ps2 DVD drive it says a warning "Laser radiation when open"
so
my question is:
Is there any laser radiation risk when the console/drive is turned off and
unplugged?
No power, no light, no problem. If you're seriously paranoid, you can
buy some cool looking laser eye protection safety glasses.
http://www.cyber-mag.com/station/laser.html
For PS2 CDROM repair instructions, see:
http://www.cyber-mag.com/station/laser.html
Tweaking the pots increases the laser driver current, which shortens
the lifetime. I've "fixed" some cdrom drives this way, only to have
some of them fail permanently after a few days.
For a lasting professional repair, tweaking the laser power pot is never a
recommended strategy for the short term failure reasons that you state.
Yep. However, there are three adjustments on most cdrom drives. The
laser current is not available on all models. However, there are
adjustments for the focus coil bias (sets the height) and servo loop
gain (sets ability to track warped disks). Both of these can be
adjusted to compensate for "normal" mechanical wear. See:
http://www.fortunecity.com/meltingpot/india/245/index5.htm
http://www.repairfaq.org/REPAIR/F_cdfaq7.html#CDFAQ_005
There are a few exceptions to this rule - notably Pioneer lasers - where
setting the laser current is an official documented part of the overall
setup procedure.
Umm... I don't think Pioneer has an accessible laser current (power)
adjustment. (I don't have a schematic or manual to be sure). I
couldn't find anything in Pioneer section of the RepairFAQ proceedu
http://www.repairfaq.org/REPAIR/F_cdfaq8.html#CDFAQ_014
Currently, it costs me less to replace a cdrom drive than it does to
repair one. So, I consider tweaking the various adjustments to be a
last-ditch heroic attempt to save the drive from the e-waste pile. If
it works (about 50% batting average), I win. If it doesn't, the
customer gets a new drive.
--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060
http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558