CD player needs warmup - skipping errors
Sam Goldwasser
Suggestion 1: Leave it on all the time :-).
Seriously, two possibilities come to mind:
1. gummed up/dirty spindle motor resulting in inability to consistently get
up to the higher speeds needed near the start of the disc.
2. fine cracks in flex cable (sonys are known for this unfortunately as are
others) which usually result in similar types of problems.
You have eliminated most else - the laser pickup itself would not likely
improve when it got hot.
--- sam : Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Lasers: http://www.geocities.com/CapeCanaveral/Lab/3931/lasersam.htm
Usually latest (ASCII): http://www.pacwest.net/byron13/sammenu.htm
In article <66rkrk$d3t$1...@fbi-news.informatik.uni-dortmund.de> gari...@neuro.informatik.uni-dortmund.de (Ralf Garionis) writes:
Right after being powered on, my CD player won't read the disc directory of
any disc inserted. The pickup resets to the inner track of the disc and
begins to move forth and back across the disc.
At this time the player is not able to play the, say, first quarter of the
disc whithout having a lot of short distance skipping problems. Each time
the pickup moves a bit back and forth. The remaining three quarters of the
CD can be played without any errors.
When the player is warmed up by playing for about 20 to 30 minutes, the
directories of any CDs are read immeadiately and there are no more
problems with the first tracks of any CDs. For warming up the player has to
play a disc - only switching the power on is not sufficient. The player has
to be switched off for some hours so that the errors will return.
Now, I've read the FAQ and therefore cleaned the player's lens and carefully
lubricated the pickup guidance (the pickup is moved by a linear motor) - at
no result. Finally, by using cold spray, I cooled the warmed up player's
integrated circuits down to the temperature of the moon's sun-averted side
- I found no defective IC.
The FAQ says here that about any part of the player can be damaged - but the
behavior described above is very uncommon for errors, isn't it?
BTW: Right after switching off the unit (it's a real power switch, no
standby switch), the lens shortly jump up (a click is audible); the player
is supposed to be two years old.
Please, is anybody able to provide some helpfull insights?
Ralf
ZMachar780
Sam is exactly right about the laser, if anything it would get worse with time.
It's probably related to the spindle motor.
BTW : brand and model number info would help.
Mark Z.
ZMachar780
Darn. Unfamiliar with this one. I wonder who really made it -- Onkyo to the
best of my knowledge hasn't made their own for a while. Is it a changer model?
I guess most are these days. At any rate, you could try lubricating the top
shaft of the motor, and if you can possibly get to it you could check the
spindle motor for shorts, particularly as you rotate it slowly by hand. Shorted
brushes are quite common and can sometimes be cleared, at least temporarily.
Forcing a cleaner/lubricant into the small slits at the bottom of the motor,
several times, followed by a blast of air to get out any excess, will sometimes
do the trick. Usually don't get recurrences excpt in commercial applications,
where usage is higher, and the motors generally in worse shape.
Good Luck.
Mark Z.
>|> Sam is exactly right about the laser, if anything it would get worse
>|> with time.
>|> It's probably related to the spindle motor.
>|> BTW : brand and model number info would help.
>|>
>|> Mark Z.
>|>
>|>
>
>
>The CD player is an Onkyo DX-6870 (supposed to be two years old) from the
>last
>but one generation of Onkyo CD players. It's almost identical to an Onkyo
>DX-6850. - I don't know if these model numbers were used worldwide.
>
>Thanks,
>
>
KENNY VICKERS
ZMachar780 wrote:
>
> Sam is exactly right about the laser, if anything it would get worse with time.
> It's probably related to the spindle motor.
> BTW : brand and model number info would help.
>
> Mark Z.
>
LOW OUTPUT WHEN FIRST TURNED ON, THEN ABOUT 3MIN LATER FOUND MUCH MORE
OUTPUT AND PLAYES FINE. BUT THIS IS ONLY 3 OUT OF ABOUT 600 A MONTH FOR
2 YEARS NOW.
AND WILL PLAY