OPUS DAC: Right channel silent - diyAudio
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Old 14th August 2014, 02:11 AM   #1
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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!
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Old 14th August 2014, 09:09 PM   #2
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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...
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Old 17th August 2014, 12:36 PM   #3
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Location: Nashville, TN, USA
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Thats probably the best route. It sounds like that channel's output is dead.
Less pulp more juice Twisted Pear Audio.
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Old 18th August 2014, 03:38 PM   #4
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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!
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