Onkyo DX-7333 CD player sometimes doesn't recognize CDs - diyAudio
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Old 6th January 2013, 06:56 AM   #1
HWTest is offline HWTest  Czech Republic
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Default Onkyo DX-7333 CD player sometimes doesn't recognize CDs

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?
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File Type: gif DX7333.GIF (30.9 KB, 91 views)
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Old 6th January 2013, 06:59 AM   #2
Mooly is online now Mooly  United Kingdom
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This covers general alignment,
Sony CDP790 and KSS240 Restoration Project
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Old 6th January 2013, 07:14 AM   #3
HWTest is offline HWTest  Czech Republic
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Thanks, I'll go through it and report back
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Old 7th January 2013, 02:35 PM   #4
T Leung is offline T Leung  Hong Kong
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HW test: You may be using the same web site as below : ( I normally use HiFiEngine).
ONKYO DX-7711-SM Service Manual free download, schematics, eeprom, repair info for electronics
2 free download per day without login. Try your luck with these 2.
My DX-7711 Service manual only has adjustment pages but pretty clear for the Scope check/adjust, IMHO. See if that help to figure out yours. (My 7711 shows the similar symptom, I may adjust it a bit later.)
But I have the full service manual for DX-7911. pm me so that I can send you a copy of 7911 SM full.

Last edited by T Leung; 7th January 2013 at 02:42 PM.
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Old 8th January 2013, 08:47 AM   #5
HWTest is offline HWTest  Czech Republic
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I've downloaded a bunch of SMs for other Onkyo CD players, fortunately the procedure is (mostly) described there.
The CD player now recognizes only the Test CD and one music CD (not always), no other CDs, no CD-Rs.
The "eye pattern" on the RF test point is only 0,6-0,7V. According to other SMs it should be 1,2V+-0,3V.
Is the laser dying?
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Old 8th January 2013, 10:45 AM   #6
Mooly is online now Mooly  United Kingdom
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If the lens is clean then most probably yes.

The next step would be to check the laser current. Usually there is a low value resistor where the volt drop can measured and current calculated. KSS pickups often have the current for that pickup (that it was calibrated too) as the last three digits of the serial number on the pickup. eg 123456529 would be 52.9 milliamps. If its increased by more than a few percent then suspect the laser.
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Old 9th January 2013, 02:54 AM   #7
HWTest is offline HWTest  Czech Republic
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I think it's R101 (22 Ohm) but now I have the problem that the player doesn't want to recognize any CD
I have to be patient and try ...

On the laser are two "numbers" printed:
10733
HA496

Last edited by HWTest; 9th January 2013 at 03:02 AM.
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Old 9th January 2013, 07:08 AM   #8
Mooly is online now Mooly  United Kingdom
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That would be 49.6 ma and mean a volt drop of around 1.09 volts across the 22 ohm. You would only see the voltage during play or if it won't recognise a CD, during focus search.
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Old 9th January 2013, 01:15 PM   #9
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1,035V seems to be OK.

I'm out of ideas ...
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Old 9th January 2013, 01:47 PM   #10
Mooly is online now Mooly  United Kingdom
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That figure is a guide that the laser diode itself is drawing the correct current and that the optical output power is correct.

There can still be many other causes of low recovered RF. Is the lens clean ? Have to ask.

The focus bias (offset) pot can be tweaked when playing to get the highest amplitude RF.

You may just have a faulty pickup (photodiode array problem or internal contamination etc).
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