LASERandDVDfan said:
The best way to measure laser power for optimal performance is through the use
of a laser power meter, which is an instrument that measures the actual laser
light output. You will also need the service literature to determine what the
optimal laser power reading must be.
If you are not sure at all, replace the pickup. Onkyo usually uses Sony
pickups (but there are possible exceptions), so replacements should already be
optimally calibrated from the factory. - Reinhart
Thanks...for some CDP I've worked before they stated laser current as
adjustment point (measured through voltage drop on emitter resistors. And on
one model (don't remember which) service manual says - adjust potmeter on
pickup PCB until You get 1Vpp eyepattern on RF point. Of course - power
meter is best, but current is measure of condition of pickup.
And this is beautiful piece of old audiophile player (Integra R1) with
pickup (like KSS110C, but it's not) mounted on linear motor (1 magnet / 1
coil system for rough tracking loop) - no sled motor. It's not possible to
find new pickup anymore. I searched all over the net (and not just me).
Onkyo service in Zagreb doesn't support this anymore. I got it bad - barely
reading only few originals. Many people played with laser power and plastic
cross on potmeter is damaged because of many revolutions. But they didn't
cleaned inside of pick-up. There are upper plastic and lower metal cover
which can be easily removed. Complete upper part with F/T coils can be
unscrewed and carefully put aside. No position adjustment except little play
in holes... Used dry cotton for inside optics. After that it works
perfectly - reading CD-R with no problem. If stressed on last track (...put
my finger on CD in rotation...) it finds position very quick and resumes
playing. It's nice that nobody played with adjustments pots on PCB!
Before all of that I worked-out spindle motor with +- higher voltage,
cleaned and lubricate again motors and shafts, but this didn't bring larger
improvement.
And this player almost gone to scrap. That's why I suspect that current is
maybe too high - reading too good!