Re: Correct laser diode current for Onkyo DX-6550?

From: Sam Goldwasser (sam_at_saul.cis.upenn.edu)
Date: 06/18/04 

Date: 18 Jun 2004 18:52:48 -0400

"Zeljko" <zeljko.hrvoj@zg.htnet.hr> writes:

> Please,
>
> If anybody has service manual somewhere in sight - which is the correct
> laser diode current (or voltage drop at two 33ohm in parallel - R102/R103)?
> Now I have 0.92V which is 55mA.

I don't have the manual but the laser diodes in CD players are run
in constant optical power mode which means the current is not a
fixed value. There should be either a value for the optical power
out of the objective lens or a sense voltage based on the monitor
photodiode current.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
 Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
        | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header is ignored.
To contact me, please use the feedback form on the S.E.R FAQ Web sites.