OPUS DAC: Right channel silent - diyAudio
Go Back   Home > Forums > Commercial Sector > Manufacturers > Twisted Pear

Twisted Pear Superior quality electronic kits

Reply
 
Thread Tools Search this Thread
Old 14th August 2014, 03:11 AM   #1
diyAudio Member
 
Join Date: Mar 2010
Location: Loss Angeles
Default OPUS DAC: Right channel silent

Hi, I've enjoyed my OPUS for a while now but the right channel is silent.

Perhaps the most notable reading is 2.42VDC on each of the two Right output channels, measured at the vias beneath the Wolfson; the Left Channel + currently has the 22uF coupling cap removed (measured it) and its reading is 2.792VDC; the via which goes to the - cap and output reads .307VDC (still has the coupling cap installed). Replacing the cap on the Left + channel changes nothing.

Zapped my Wolfson chip?

-Both power supplies are +7.5V.
-Both the + and - R outs are silent.
-Have just pulled one of the Elna 22uF output caps and it measures at the correct value, not blown.
-Bypassed the terminal strip and soldered the hot terminal of the R output jack to the - terminal of one of the two 22uF output caps; nothing.
-Reset all DIP switch settings on both boards.
-Checked the RCA output jack for continuity on signal and ground and it's fine.
-Swapped the output cables and sound comes out of both amplifier/speaker channels from the OPUS Left output jack. Cables and the rest of the system check okay.
-All four receiver LEDs are green.

-Receiver board DIP settings are:
1: Top (toward teh four SMD resistors R4-R7)
2: Bottom
3: Bottom
4: Top

DAC board DIP settings are:

1, IS2: Up (toward the silkscreened text, away from the power terminal strip/edge of the PCB)
2, DSD: Down
3, DEEMPH: Down
4, MODE: Down
5, IWO: Up
6, DIFFHW: Down
7, FSEL: Middle
8, MUTE: Top
9, OSR, Middle

Thank you for the great projects!
  Reply With Quote
Old 14th August 2014, 10:09 PM   #2
diyAudio Member
 
Join Date: Mar 2010
Location: Loss Angeles
mouser.com have the Wolfson DAC IC for $13.00 and I'm not afraid of SMD soldering...may just take that route...
  Reply With Quote
Old 17th August 2014, 01:36 PM   #3
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Thats probably the best route. It sounds like that channel's output is dead.
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 18th August 2014, 04:38 PM   #4
diyAudio Member
 
Join Date: Mar 2010
Location: Loss Angeles
Thank you! For the record, I've never put it into a case of any sort so any amount of random nonsense may have shot the IC. Not TP's fault. Cheers!
  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
70s Marantz PM 550 DC with silent left channel Participant Solid State 6 4th November 2013 09:33 AM
4 Channel amp goes silent/turns off with increase in source volume Kalmah Car Audio 21 10th January 2013 06:51 AM
Trying to troubleshoot Marantz Model 1530 silent channel - possibly bad LM391-80 IC Coconuts 500 Solid State 9 2nd September 2012 07:30 AM
One channel silent - until you increase the volume slightly - on two different amps! Coconuts 500 Solid State 1 25th June 2012 11:42 AM
Cyrus One Amplifier - One Channel Silent - What could it be? TylerDurden Solid State 1 15th July 2011 12:25 PM


New To Site? Need Help?

All times are GMT. The time now is 07:04 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