Cd player adjustments

Hi!

How do you know it is a matter of adjustment? It could be any like a bad pickup or mechanical problem, tell us more about your problem. If your intention is to adjust this by yourself a scope is a real good friend. Some people adjust by listening but I wouldn't recommend that.

Bjorn

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or

The problem is that I modified this trimers, and now the player can't play all the cd's. Only the perfect and immaculate cd's are played.

When I touch the FOCUS trimmer the system works, but not perfectly.

Then, I suspect that the player (the optic, the laser) is ok, but I missed the correct adjustment.

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about

schematics

see

See the CD player repair guide at the site below. Assuming nothing else is wrong, you should be able to get back to a working state with the adjustments. But if you were attempting to fix a problem that wasn't an adjustment, then you will at best be back where you started.

As as noted below, test equipment and a service manual will be needed to achieve optimal performance.

--- sam | Sci.Electronics.Repair FAQ Mirror:

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Important: Anyth> The problem is that I modified this trimers, and now the player can't play

Hi Sam, It is an honor to talk to you. Your sites have helped me many times.

question about CD players.

What is the key diff between CD players that can play CD-RW and those that can't.

Is it just the laser power level or is it something else. If it's just the power, would turning the power up a bit (I know the risks) help?

Mark

(Butting in...)

Has to do with reflectivity at audio CD laser diode frequency, and threshold detection level of the RF amp and decoder circuits.

Mark Z.

I agree. The laser power might be different but many factors contribute to the ability to read various formats. Could be more sophisticated front end circuitry - or luck. :)

--- sam | Sci.Electronics.Repair FAQ Mirror:

Repair | Main Table of Contents:

+Lasers | Sam's Laser FAQ: | Mirror Sites:

Note: These links are hopefully temporary until we can sort out the excessive traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is ignored unless my full name is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs.

Sam: Hi, I have been into audio for some time now and I notice that identical make/model cd players often sound quite differently. Can these differences be adjusted out using the focus , tracking or other pot controls? If so , what should I try first? I beleive I can discern the difference audibly. Thanks much , Wayne

what differences do you think you hear?

Mark

Of course the variables in the system are the two players- the volumes are set the same and the electronics have similiar "on" times. The difference is quite audible- one player sounding rich and slightly dull; the other quite a bit brighter- both players provide good reproduction. The audibility of subtle changes , such as fuse type, can make a difference , Wayne

"fuse type" can make a difference? Excuse me? :)

--- sam | Sci.Electronics.Repair FAQ Mirror:

Repair | Main Table of Contents:

+Lasers | Sam's Laser FAQ: | Mirror Sites:

Note: These links are hopefully temporary until we can sort out the excessive traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is ignored unless my full name is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs.