right channel distortion static after cd mods - diyAudio
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Old 7th December 2014, 07:29 AM   #1
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Default right channel distortion static after cd mods

I know there are smiliar threads, but this is after recap and new opamp.

I had so much trouble with the smd i took to to get it done.

First off i played it , was no sound, though cd was changing tracks etc and functioning so i assumed no power issues.

I took the board out and found using the ohm selector on the multimeter, one bridge wasnt working so fixed that.

Now i get clean sound from the left and right , i describe that as static /distortion. When i get a chance tomorrw. I will search for any dry joints. Again multimeter gave it all the clear on the ohm.

I tested another Technics player with out the earth to the case, and it was fine, as the new RCAs are grounded , not to the case.

Any other suggestions would be helpful

pics of the mod Looks stunning
PSU computer style cable removed, 24awg Neotech copper 600V
PSU Nichicon KZ. FG SilmicII
AUDIO SECTION: DAC Elna Cerafine opamp/output Elna SilmicII and ES Nichicon
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Last edited by SVI3206A; 7th December 2014 at 07:31 AM. Reason: adding info about mod
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Old 7th December 2014, 07:36 AM   #2
Mooly is offline Mooly  United Kingdom
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I know it sounds obvious but "static after cd mods" means it has to be something you have done. You need to check for stray solder blobs and damaged or broken print. Also check all component values are correct. Check all the rails correct too.
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Old 7th December 2014, 08:23 AM   #3
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Thanks Mooly, the opamp and output area i increased the voltage 10v to 50v, but same capacitance? but that should not matter. The board i bought in to get the smd done, i bought it out of the player to cut costs, so the guy wasnt able to test it. I feel, the problem must be my soldering, i had to bridge some, so there might lie the problem hope to have sorted soon cause sounds great even on the crap computer speakers, as i feared to hurt my speakers
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Old 7th December 2014, 01:31 PM   #4
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Check if you have accidentally reversed polarity of some capacitors.
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Old 8th December 2014, 03:23 AM   #5
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I re did some soldering and re did a bridge on one cap, i had to actually take it to the next point, a resistor and a rail, but tested fine with ohm meter, but again same old same old , right channel, maybe a bit less audiable this time as bad as before, left is perfect. I wonder if the opamp is faulty, but then i doubt that as the left is fine,

Could it be going up 10v to 40v is too much. I have other Silmic going in the mail, they are 16v, i could use them and also the 10v to 50V on the ES, i have a 25v one as a spare.

out goes the board again

Thanks Willi yes I did look over the caps, only ones i am not sure are the BPs, but direction isnt important with them.
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Last edited by SVI3206A; 8th December 2014 at 03:24 AM. Reason: opps
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Old 8th December 2014, 07:45 AM   #6
Mooly is offline Mooly  United Kingdom
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Voltage rating of the caps won't cause any issue (as long as they are high enough rated to begin with)

If the left channel is OK then it sounds like a blob or a break somewhere around the right channel DAC/processing. It won't be an opamp (99.999% sure on that)
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Old 8th December 2014, 08:14 AM   #7
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Hi Mooly thank you, Yes since its so clear and fine on the left, i realise it must be the right, sure the soldering on the opamp is good cause I had it done. Maybe a rail, I didnt look around the DACs themselves so will trace all over it tomorrow. Caps for P990 arriive soon, Leaving those opamps, so the P350 might beat it with the LM4562
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Old 10th December 2014, 07:54 AM   #8
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put it back together after touching up solder, moving one lead away from the track, cleaned it up and still bag right channel , but the channel that works the left is so so nice

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Click the image to open in full size.
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Old 10th December 2014, 08:04 AM   #9
Mooly is offline Mooly  United Kingdom
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The only way you will fix this is by logical fault finding.

Have you checked the DC voltages around the opamp, one channel vs the other to see if that shows anything ? And make sure you haven't dropped a solder blob somewhere on the PCB around one of the DAC's

If you can't find anything from that then look at disconnecting the DAC outputs and cross linking left and right to try and prove whether the problem really is in the analogue stages or whether its further forward around the DAC.
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Old 10th December 2014, 08:26 AM   #10
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Thanks Mooly, I don t think my multimeter can detect DC. I will check everything again, you mean the PCM56 DAC? I wonder if its around the PSU area or around the 4558 opamp area, check the whole thing over tomorrow. Maybe the very fine traces on the opamp are not exactly touching on the right side. I was worried it was my briding work near the opamp where I lost most of the traces, but i joined the cap with wire to both the rail and resistor

P990 is done with caps, including new PSU caps, i trying out the Elna R20
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