EMU 0404 usb 2.0 with a power on problem - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools

Equipment & Tools From test equipment to hand tools

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 30th October 2012, 12:18 PM   #1
lemon is offline lemon  Greece
diyAudio Member
 
Join Date: Apr 2009
Default EMU 0404 usb 2.0 with a power on problem

I bought this for parts from ebay.

Like seller told me, it damaged by opposite power polarity or by power polarity bridge, probably.

After power on, nothing is happening!
Because we have not any circuit diagram, I am looking with the continuity of multimeter the paths after power switch.

It is a searching in blind, sure! Maybe the best solution is to find the appropriate flex connector for working with the both parts open, not closed like now.

After that, I found some electronics to have a relation with the power paths. At the attachment photo I have mark some of these.
I have changed 2 of these (by yellow circles) and now lights on the green led (power on led) above headphone level, but no any other led.

1) Any suggestions?
2) Can someone find to me the appropriate code (farnell, mouser) for extra flex connector? I want to work, with both sides open.
Attached Images
File Type: jpg emu_problem.jpg (373.3 KB, 205 views)
  Reply With Quote
Old 14th January 2013, 02:20 PM   #2
lemon is offline lemon  Greece
diyAudio Member
 
Join Date: Apr 2009
With marvelous instructions of diyAudio wiki and some appropriate conductors (finally splits my emu), my emu has repaired 90% almost.

I must changed three power converters.

But, I have problem with phantom power, still. 0V!

As I saw to the wiki, the part U10 (PHOI) has the responsibility for the 47V (probably).
I measured the round area of U10 to mine emu and an other well function emu.

At the photo attachment, with yellow notes are the identical voltages btw two emu's. The red ones are differences and in brackets are mine values.

I thought the problem was to U10. I found a PHKI (same but with a less current) but it is nothing changed, unfortunately!

Any suggest, please!

Click the image to open in full size.
  Reply With Quote
Old 15th January 2013, 11:04 AM   #3
lemon is offline lemon  Greece
diyAudio Member
 
Join Date: Apr 2009
For some reason the attachment photo, seems to appearing to my computer but not to others...

Here it again!
Attached Images
File Type: jpg 47V.jpg (524.4 KB, 72 views)
  Reply With Quote
Old 15th January 2013, 02:13 PM   #4
sidiy is offline sidiy  Canada
diyAudio Member
 
sidiy's Avatar
 
Join Date: Sep 2005
Location: Montreal
It looks like you don't have a High (3.3V) on the Enable (pin 4) of U10. Is the top board connected and does the 48V LED come on when you press the switch?

The 48V should appear between pins 2 or 3 to gnd (pin 1) of a XLR connector, not on a TRS (6.3mm).
__________________
Make two for stereo
  Reply With Quote
Old 15th January 2013, 05:17 PM   #5
lemon is offline lemon  Greece
diyAudio Member
 
Join Date: Apr 2009
Yes, the top was connected with a long 20cm conductors (I had split the emu).

OK, I found the problem. The pin4 of U10 had a cold solder, some Chip-Quik flux and now is perfect.
PHIKI now gives almost 41V (has 1.1V the pin3, FB vs 1.23 of PHOI).

sidiy, thanks for the interesting.
  Reply With Quote
Old 29th January 2013, 05:32 AM   #6
arizzi is offline arizzi  Italy
diyAudio Member
 
Join Date: Mar 2011
Quote:
Originally Posted by lemon View Post
I bought this for parts from ebay.

Like seller told me, it damaged by opposite power polarity or by power polarity bridge, probably.

After power on, nothing is happening!
Because we have not any circuit diagram, I am looking with the continuity of multimeter the paths after power switch.

It is a searching in blind, sure! Maybe the best solution is to find the appropriate flex connector for working with the both parts open, not closed like now.

After that, I found some electronics to have a relation with the power paths. At the attachment photo I have mark some of these.
I have changed 2 of these (by yellow circles) and now lights on the green led (power on led) above headphone level, but no any other led.

1) Any suggestions?
2) Can someone find to me the appropriate code (farnell, mouser) for extra flex connector? I want to work, with both sides open.
I have a board with probably the same problem you had. After replacing the first DC/DC converter I got the green LED lighting as you got. Could you please list the component you replaced in order to get the board working? I would be really glad!!!

Andrea
  Reply With Quote
Old 2nd February 2013, 11:26 PM   #7
lemon is offline lemon  Greece
diyAudio Member
 
Join Date: Apr 2009
Andrea, I have note to the two photos the parts has changed with yellow circles. The last one is U10, for the other parts, must to find in my files a big photo to see what type of marks are.
Attached Images
File Type: jpg emu_problem.jpg (366.5 KB, 62 views)
File Type: jpg emu_problem2.jpg (511.5 KB, 50 views)
  Reply With Quote
Old 8th May 2014, 12:25 PM   #8
diyAudio Member
 
Join Date: May 2014
Sorry for necro-digging this topic, but I see there are many owners of this card here and I need some help.

I recently bought the card used and out of warranty. The card works okay but has some serious problems with cold start. Every day in the morning I have to turn it on and off and on again many, many times before it boots properly. After that, the card seems to work (and even boot) fine until I turn it off in the evening. The next morning, the whole scenario repeats.

What happens if the card fails to boot:
  • "Power on" LED is on
  • Crackling pulses come out of headphones
  • Drivers do not recognize the card
  • No other LEDs are on
  • Controls do not respond
And optionally:
  • All LEDs are on
  • Some of the LEDs are off: "Sync Status", "Direct Monitor", "S/PDIF"

Any idea what is wrong?

What I already tried:
  • Get another power supply
  • Connect the two jumper "BOOTSTRAP" pins inside and turn on the device
  • Visually check all the electrolytic capacitors inside

Thanks in advance.
  Reply With Quote
Old 8th May 2014, 08:51 PM   #9
lemon is offline lemon  Greece
diyAudio Member
 
Join Date: Apr 2009
Hi,
I think, that you must have all the time un-split the emu (with some appropriate conductors) and when this behavior happens check all the yellow marking chips (they seemed at my previous photos) for right voltages.
  Reply With Quote
Old 13th May 2014, 01:11 AM   #10
diyAudio Member
 
Join Date: May 2014
What does the red and orange marks say, should i connect them?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
emu 0404 output gone...... Nikitas Digital Line Level 10 6th July 2012 04:52 AM
FS: EMU 0404 USB Package! jdubs Swap Meet 0 14th February 2012 01:44 AM
EMU 0404 PCI - Needs a fixin' first, but... jbeckva Digital Line Level 1 28th December 2010 02:53 PM
EMU 0404 Sound Card tripathdude Digital Source 5 23rd May 2008 04:46 PM
Modding my EMU 0404: Can someone please verify bg4533 Digital Source 4 11th November 2004 09:32 PM


New To Site? Need Help?

All times are GMT. The time now is 07:54 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2