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y1 gamma-1 DAC - Page 40

post #586 of 1537
4/3/09 at 1:37pm
Indeed, thanks also to MisterX for his contribution to the γ1; it's a fine DAC with absolutely wonderful sound quality and portability as an added bonus!

The only feature I really long for is sample rate indication, of course additional I/O options a full-size DAC can afford will be nice, too.
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post #587 of 1537
4/5/09 at 1:12am
Hi Guys,

Having some trouble with the one I've built. The JP2D pins 1-2 are shorted to ground, what can be the problem? (I cant find any solder bridges).
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post #588 of 1537
4/5/09 at 2:47am
Quote:
Originally Posted by KT88 View Post
Hi Guys,

Having some trouble with the one I've built. The JP2D pins 2-3 are shorted to ground, what can be the problem? (I cant find any solder bridges).
Is that with the shorting block removed from jp2d?

If there's a ground on jp2d pin 3, check the three pin side of u5d and u6d for a bridge between pins.
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post #589 of 1537
4/5/09 at 4:23am
Do you have a good high rez image that we can 1000X zoom in on and maybe spot what the problem is?

Quote:
Originally Posted by KT88 View Post
Hi Guys,

Having some trouble with the one I've built. The JP2D pins 2-3 are shorted to ground, what can be the problem? (I cant find any solder bridges).
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post #590 of 1537
4/5/09 at 10:36am
Sorry, I meant pins 1-2 are shorted to ground not 2-3.

As for pictures, here they are (dont mind the flux I will clean it in a few minutes):
http://img21.imageshack.us/img21/2970/img0317a.jpg

http://img151.imageshack.us/img151/4638/img0316.jpg
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post #591 of 1537
4/5/09 at 10:50am
<minds the flux>
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post #592 of 1537
4/5/09 at 10:53am
Can't tell if it's just flux, or solder bridge at arrow?
Clean the flux off the board first. It'll make it much easier to check for shorts.


LL
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post #593 of 1537
4/5/09 at 11:42am
Tried that one. not a solder bridge, I will post some pictures after I clean the flux.
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post #594 of 1537
4/5/09 at 12:30pm
It also looks like you missed a few solder joints.
(one on the switch, one on the DC jack and U5D's ground pin also looks suspect)
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post #595 of 1537
4/5/09 at 1:25pm
Cleaned up a little bit, took another photo. The USB board started making some problem too (worked fine this morning but not now - but I dont really care about it, the DAC board is the important thing for me).

Here's the photo in higher res, hope you guys will be able to spot the problem:
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post #596 of 1537
4/5/09 at 1:33pm
these look suspect. Sure you iron is hot enough?


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post #597 of 1537
4/5/09 at 2:10pm
checked all of these, they were fine. The iron is at 360C (now moved up to 390 since there's no SMD at the moment).
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post #598 of 1537
4/6/09 at 1:56am
Got it. U1D was the cause of the problem. Unfortunatley since I took it out in the middle of being too angry to be gentle, I just ripped it out, so now no U1D, just using the jumper instead. The USB board is still no working, but I've checked everything except for the PCM2702 chip, so not sure how I'm gonna take it out without destroying it.
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post #599 of 1537
4/6/09 at 3:51am
Without specialized desoldering equipment there is just about no way to remove the PCM2707 chip without destroying it. Basically you have to cut all the leads off, remove the chip, heat and remove the leads off the pads one by one, and then clean up the pads.
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post #600 of 1537
4/6/09 at 10:32am
Hi Ti,

I know I can remove it that way, but that means I'll have to purchase another chip, and shipping to Israel is an issue

I'll try something else before that, it might work, will keep you all posted.
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