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December 12, 2019, 08:52:10 AM

Author Topic: #8 solder tab  (Read 760 times)

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Online Tom-s

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Re: #8 solder tab
« Reply #15 on: August 22, 2019, 07:48:25 PM »
I think it still looks ok.
If it feels firm, i'd keep it just like you have.
And if you have some portion of it remaining on the other side of the wire, you could test for continuity.

Offline benzxc

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Re: #8 solder tab
« Reply #16 on: August 22, 2019, 11:06:30 PM »
Thanks, Tom!
Ben Chiou

Online Deke609

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Re: #8 solder tab
« Reply #17 on: August 23, 2019, 02:39:24 AM »
It looks like you only nicked the outer tinning, so I'd say you are fine. The only purpose of the drain wire is to connect the tinfoil shield wrapped around the larger wire bundle to ground so that any induced currents (interference) in the tinfoil shield can "drain" to ground. We're talking about very small currents. It's not part of the either the signal wiring or the power wiring.


At most I'd guess that the nick in the drain wire has reduced the amount of mechanical stress (e.g., repeated bending) that the wire can take. But that's not an issue b/c it won't be subjected to mechanical stress.


[And I'll add: this is coming from someone (me) who is obsessed with shielding and drain wires - I add copper shielding to pretty much every wire I can and am pretty fussy about it. And that nick in the drain wire wouldn't bother me  ;) ]


cheers, Derek
Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and EML 300B)  -> Kaiju (w/ DCFil and EML 300B) or Stereomour II (2A3 [EML Mesh] and 45 Conversion [EML 45B])  -> Audeze LCD4

Offline Paul Birkeland

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Re: #8 solder tab
« Reply #18 on: August 23, 2019, 05:05:42 AM »
I would be more concerned about the two 4-40 nuts on that screw mounting the terminal strip.
Paul "PB" Birkeland

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Offline benzxc

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Re: #8 solder tab
« Reply #19 on: August 23, 2019, 05:16:43 AM »
Derek,

Thanks a lot!  Great information to know!

Paul,

Thanks!  Just to double check - I just went over the manual and on page 15 it states that I was supposed to mount two #4 nuts on the terminal strip.  Did I do something wrong there? 

Ben
Ben Chiou

Offline Paul Birkeland

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Re: #8 solder tab
« Reply #20 on: August 23, 2019, 06:25:50 AM »
Ah, it looked a little funny, but now I am indeed remembering that the standoffs are uneven without it!  Sorry to bug you about that.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline benzxc

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Re: #8 solder tab
« Reply #21 on: August 23, 2019, 06:40:36 AM »
Phew!  For a second there I thought I had to take apart my build!  Good to know that is not necessary! 8)
Ben Chiou

Offline benzxc

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Re: #8 solder tab
« Reply #22 on: August 23, 2019, 09:19:15 AM »
Just did the resistance check - all good.

Voltage check - all good except for terminal 17, which is supposed to be 0V, I am getting 15-25v.  Any ideas?

Thanks!
Ben Chiou

Offline benzxc

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Re: #8 solder tab
« Reply #23 on: August 23, 2019, 09:25:22 AM »
An LED just exploded!
Ben Chiou

Offline benzxc

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Re: #8 solder tab
« Reply #24 on: August 23, 2019, 09:35:09 AM »
Two popped I think.  Going to need to order replacements, but will turn it off for now until I figure out what's wrong with it.
Ben Chiou

Online Deke609

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Re: #8 solder tab
« Reply #25 on: August 23, 2019, 09:42:03 AM »
You'll need PB to diagnose this, but to get the ball rolling I suggest you post pics of the pcb board, the terminal strip with T17 and the D 4-pin socket.
Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and EML 300B)  -> Kaiju (w/ DCFil and EML 300B) or Stereomour II (2A3 [EML Mesh] and 45 Conversion [EML 45B])  -> Audeze LCD4

Offline Paul Birkeland

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Re: #8 solder tab
« Reply #26 on: August 23, 2019, 09:44:21 AM »
Voltage check - all good except for terminal 17, which is supposed to be 0V, I am getting 15-25v.  Any ideas?
There's a 249K resistor from 17 to 16, then a black wire from 16 to ground.  One of these is probably not connected.

Posting photos would be a good idea.

LEDs explode when there's an electrically egregious miswire (usually).
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline benzxc

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Re: #8 solder tab
« Reply #27 on: August 23, 2019, 09:49:32 AM »
Here are the photos
Ben Chiou

Offline Paul Birkeland

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Re: #8 solder tab
« Reply #28 on: August 23, 2019, 09:56:05 AM »
Ah, so the half of the C4S that feeds the side with the problematic voltage is OK.

It would be good to see the other 4 pin and 9 pin socket where that half of the C4S board feeds.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline benzxc

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Re: #8 solder tab
« Reply #29 on: August 23, 2019, 10:01:58 AM »
Somehow I am having difficulty uploading pictures. Will do so later. Thanks for all your help!

The explosion might have gotten me banned from experimenting with DIY at home for a while....

PB, do you have an idea as to how long repair might take, if I decide to send it for repair?

Thanks!
Ben
Ben Chiou