I have a Onkyo DX-7333 CD player, which sometimes doesn't recognize CDs.
I don't think it's a laser pickup (KSS-213C) problem, because when it recognizes the CD, it plays it without a problem, even very scratched ones.
The next thing is, it should play CD-RWs, but it doesn't even recognize them.
I think it needs adjustment
There are two pots on the main PCB - Focus Gain R123 and Focus Offset R112.
Also there are two test points:
TP1 4 pins, first pair labelled Tracking Gain, second pair Focus Gain
TP2 2 pins labelled RF Out and VC
But in the service manual is no description, what should be measured on the test points and how to set Focus Gain and Focus Offset.
In the attachment is a cut out from the schematic, where the test points and adjustment pots are.
Please if someone knows, how to?
2013, January 6 - 09:06
#1
HWTest
Hello,
Do not set pots! First check the power supply (Electrolite Condensators)
and spindle motor!
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Power supply and the spindle motor seem to be OK.
But the "eye pattern" on the "RF" testpoint is only 0,6-,07V.
Bad laser?
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Hi,
you means on 100 Ohm R121/focus resistor?
Check (better: replace) R126 & C115 on Pin11 & read the sides 18..20_maybe helps...
K.
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No, on test point 2 (RF Out), pin 31.
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Hi,
Could you take and upload a photo that shows the "eye pattern"?
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Here is a photo of the "eye pattern"
(Sorry the photo is a little blurry)
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Will do and report back.
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A new laser pickup did the trick :-)
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