Marantz CD63 & CD67 mods list - Page 1349 - diyAudio
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Old 10th November 2009, 06:53 AM   #13481
UV101 is offline UV101  England
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Hi Steve,

Try here Lee's (Thomo) site for the opamps and caps as well as some other goodies you might fancy trying!

Definately a seperate regulator on the 5v feed to the analogue DAC. Even better a low noise reg! If you fancy going that far let i'll post instruction!

Also, read rays mod list in the 1st post. Although it starts as a component replacement list, there are some details for other mods at the end of the doc (heaphone bypass, mute disable etc)

Ian
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Last edited by UV101; 10th November 2009 at 06:57 AM.
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Old 10th November 2009, 07:06 AM   #13482
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Dammit... was testing the new lm317/337 regulators yesterday.

At some moment, I was soldering a wire to the Vin on the main PCB (where the 79xx used to be) and... bam! spark!... must have been some leftover current somewhere.

Didnt have time to check out whether there was any damage... how severe could it be?
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Old 10th November 2009, 08:18 AM   #13483
poynton is offline poynton  United Kingdom
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Death by ....bam! spark!!!!

Fatal.


Andy
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Old 10th November 2009, 09:20 AM   #13484
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Damn... doesn't sound promising...
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Old 10th November 2009, 12:13 PM   #13485
6h5c is offline 6h5c  Netherlands
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Quote:
Originally Posted by UV101 View Post
Another very tidy looking board Ray! How many boards did you have made? i'm wondering about the set up costs for a small PCB. Ian
Thanks, I like it when things look nice and neat

I ordered a small batch of just 10 pcs. at The PCBShop.com. There are no startup or tooling costs. The PCB's are made in a print-pooling system, where small batches are clustered with 'the big guys', so costs are relatively low. Took them less than 10 days to deliver them .

And for those who are interested: Partsconnexion has a 20% off (almost) everything sale. They carry a good inventory of BG's...

Regards,

Ray
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Old 10th November 2009, 01:01 PM   #13486
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As always, very usefull!
Fleas anyone?
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Old 10th November 2009, 01:02 PM   #13487
UV101 is offline UV101  England
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Quote:
Originally Posted by studiostevus View Post
Damn... doesn't sound promising...
Steve, I'd pop the original regs back and check for correct voltage/operation.

where exactly did the spark come from?

Thanks for the info Ray
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Old 10th November 2009, 02:59 PM   #13488
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Ray,

I took out the old regs so I had 3 empty holes, and was soldering a wire (unconnected on the other side) to the Vin (coming from the transformer) hole. The spark happened as I approached Vin with my soldering iron, and might have been caused by:

VIn - Soldering iron
VIn - Soldering Iron - Ground
VIn - Soldering Iron - VOut

At the time the board was out of the chassis/frame, so there was no ground really.
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Old 10th November 2009, 04:12 PM   #13489
6h5c is offline 6h5c  Netherlands
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Probably a capacitor discharge Vin <> GND. The main smoothing caps cannot release their charge if the regulators are out, so there is a remaining energy in the caps, even if the PCB is disconnected for some time. Check with a voltmeter and discharge with a 100R resistor.

Like Ian says, put the original ones back in, to make sure nothing's damaged. Otherwise you'll be solving two problems at once if one of your regs doesn't work.

Regards,

Ray
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Last edited by 6h5c; 10th November 2009 at 04:15 PM.
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Old 10th November 2009, 07:17 PM   #13490
UV101 is offline UV101  England
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I seriously doubt you've killed it btw!!!!!

I think Andy was being funny in his post eariler!!!
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