Installed New KSS 150a in my Adcom GCD 575

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#22
OK, looking at this again, geez I'm slow....

Anyhow, service manual has lots of adjustments:

VCO Frequency adjustment
Focus Offset adjustment
Visual EFM signal adjustment
E-F Balance adjustment
Tracking gain adjustment, and finally
Focus gain adjustment

So, with a scope I could basically run thru this per the manual, focus gain is done last. Don't have a scope, but the bay shows some basic units for 70 - 90 bucks. Maybe I could learn something....

How necessary are all these adjustments, probably dumb question as I'm thinking if all are spot on, unit would sound its best. Thoughts?

Mike
 
#23
milanomike said:
OK, looking at this again, geez I'm slow....

Anyhow, service manual has lots of adjustments:

VCO Frequency adjustment
Focus Offset adjustment
Visual EFM signal adjustment
E-F Balance adjustment
Tracking gain adjustment, and finally
Focus gain adjustment

So, with a scope I could basically run thru this per the manual, focus gain is done last. Don't have a scope, but the bay shows some basic units for 70 - 90 bucks. Maybe I could learn something....

How necessary are all these adjustments, probably dumb question as I'm thinking if all are spot on, unit would sound its best. Thoughts?

Mike
Click to expand...

Don't touch VCO if you don't have a frequency counter.

Focus offset is focus bias, that might help, but make sure you mark the original position first.

EFM, you don't need to touch that.

E-F Balance is tracking balance, you play a disc, press pause and measure the tracking error signal, you will see a few peaks above and below the signal, both peaks should be symmetrical.

If you get a scope, it should be at least 20MHz, it doesn't matter if it is an old model, just make sure you can get the service manual.
If you don't know how to use one, don't worry, I can help you with the basics.
 
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