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Old 4th March 2013, 06:32 PM   #3461
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Join Date: Mar 2013
well we are in the sunny south.. I really appreciate the offer because i sure would take you up on it..
It has been a year and half of total frustrations , denials, and still dont' have a working analog system!

I cant even get an answer as to which input pins are what! I can only go by the cable construction guide and assume!

I think it's in the ground architecture because i can run a 2 plug chassis input form my tuner and not have an issue but then again my tuner doesn't have balance controls and is only SE out.
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Old 30th March 2013, 01:17 PM   #3462
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Default Need help with Jan Didden passive output board

Hi all, I need your help.

I have stuffed and installed the Jan Didden passive output board. Channels 1-4 work correctly. 5 and 6 are somehow shorted, hence don't play music!

I read 1900 Ohm between the + and - on the channel 5 & 6 input pins on the board (no connection when testing the pins on the channels that do function).

Checked everything, and as far as I can see all is build by the book! So please help me if you can. A picture is attached and the faulty pins are marked with arrows.

Thank you,
Peter
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File Type: jpg Didden passive out.jpg (599.2 KB, 336 views)
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Old 30th March 2013, 01:18 PM   #3463
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Default Extra info

No caps are put on the board as I use trannies in my amps.
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Old 31st March 2013, 10:36 AM   #3464
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Default Found the problem, but what is the root cause?

Found out that both caps directly behind the xlr plug are working like wire (0 ohm resistance)?? Thus shorting the output. Removing them gives me the same resistance on all 6 channels.

Now what is the root cause? Can't believe I have had the bad luck of 2 faulty caps and that those are in the same spot on the pcb?

What could be the reason I blew them?

Hope I did not damage my DSP board.!
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Old 31st March 2013, 11:45 AM   #3465
Julf is offline Julf  Europe
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Quote:
Originally Posted by peterhenk View Post
Now what is the root cause? Can't believe I have had the bad luck of 2 faulty caps and that those are in the same spot on the pcb?
Could well have been a bad batch.

Quote:
What could be the reason I blew them?
My main suspicion is still a bad batch of caps. For a cap to go into a short circuit, you usually need an overvoltage leading to a breakthrough in the isolating material, but I have also seen similar effects from heat.
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Old 31st March 2013, 12:17 PM   #3466
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Default dsp board seems OK

Hi Julf,

Could be a bat batch, the DSP board seems to work properly (lucky me )
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Old 31st March 2013, 12:28 PM   #3467
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Quote:
Originally Posted by peterhenk View Post
Found out that both caps directly behind the xlr plug are working like wire (0 ohm resistance)?? Thus shorting the output. Removing them gives me the same resistance on all 6 channels.

Now what is the root cause? Can't believe I have had the bad luck of 2 faulty caps and that those are in the same spot on the pcb?

What could be the reason I blew them?

Hope I did not damage my DSP board.!
Are they actually shorted? Did you check after you removed them?

jan
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Old 31st March 2013, 12:32 PM   #3468
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Hi Jan,

Yep, I have tried them once removed. I could not believe it my self.

Regards
Peter
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Old 31st March 2013, 12:37 PM   #3469
AndrewT is offline AndrewT  Scotland
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I suspect overheating during soldering.
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Old 31st March 2013, 04:33 PM   #3470
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All thank you for the input.

Will put new caps in next week!

One more question, I have put a 332 ohm resistor on the digital in transformer and took out the 110 ohm one (I have installed toslink, and run Spdif directly to the PCB).

Now the digital in fluctuates between as should and highs muted?? Never had this before. It becomes worse if I manipulate the toslink cable

Could this be an echo problem? There was some discussion whether you needed to replace with 75 ohm or with higher values (between 200 and 500 was suggested).

If it is not the echo problem, I suspect that my Cirrus chip did not like some of the work I did this weekend
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