How can a CD be adjusted by eye pattern?

PinkPanther-2 · 9th June 2006, 09:41 AM

I have a Philips CD482 (CDM 4/19, SAA 7310, 7220, TDA1543(>2*TDA1541 +OPA627U+AD829). But I have no service manual and will adjust the servo part. I know it's possible to adjust the focus and laser current (carefuly!) by eye pattern on the screen. So I have also a Tectronix 2225 (50MHz) i will be thankful for some hints for such a procedure.

vt4c · 10th June 2006, 04:14 AM

Adjust the eye pattern on your scope so that it has the highest and clearest signal. I know that some design; the scope gnd conncetion should be connected to Vref rather than the gnd/-ve of the CDP power supply.

Hope this helps.

PinkPanther-2 · 12th June 2006, 07:32 AM

Thank you vt4c!
This is very valuable information. I find also a very extensive information about CD repair here:

http://www.repairfaq.org/REPAIR/F_cdfaq.html[COLOR=blue]

9th June 2006, 09:41 AM	#1
PinkPanther-2 diyAudio Member Join Date: Jun 2006	How can a CD be adjusted by eye pattern? I have a Philips CD482 (CDM 4/19, SAA 7310, 7220, TDA1543(>2*TDA1541 +OPA627U+AD829). But I have no service manual and will adjust the servo part. I know it's possible to adjust the focus and laser current (carefuly!) by eye pattern on the screen. So I have also a Tectronix 2225 (50MHz) i will be thankful for some hints for such a procedure.

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10th June 2006, 04:14 AM	#2
vt4c diyAudio Member Join Date: Jan 2001 Location: Malaysia	Adjust the eye pattern on your scope so that it has the highest and clearest signal. I know that some design; the scope gnd conncetion should be connected to Vref rather than the gnd/-ve of the CDP power supply. Hope this helps.

12th June 2006, 07:32 AM	#3
PinkPanther-2 diyAudio Member Join Date: Jun 2006	Thank you vt4c! This is very valuable information. I find also a very extensive information about CD repair here: http://www.repairfaq.org/REPAIR/F_cdfaq.html[COLOR=blue]

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