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BIII Right ouput louder than left output - Right ouput louder than left output
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Russ White  
#121 Posted : Sunday, December 30, 2012 4:48:39 PM(UTC)
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By checking that it responds to I2C commands.
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felipe  
#122 Posted : Sunday, December 30, 2012 4:59:56 PM(UTC)
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Could you elaborate, how can I do, pic or schematic will help?

Edited by user Sunday, December 30, 2012 5:11:16 PM(UTC)  | Reason: Not specified
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Russ White  
#123 Posted : Sunday, December 30, 2012 11:53:31 PM(UTC)
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You have access to the I2C signals, see if the controller is sending anything.
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felipe  
#124 Posted : Monday, December 31, 2012 12:30:52 PM(UTC)
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The controller is the chip with firmware? wich pins have I to measure?
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avr300  
#125 Posted : Monday, December 31, 2012 12:55:26 PM(UTC)
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You have access to the i2c bus right here.

The SCL is the clock signal, the SDA is the data line. Measure both with your scope both relative to GND.
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felipe  
#126 Posted : Monday, December 31, 2012 12:58:43 PM(UTC)
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Thanks, pin 7 SCL, pin 5 SDA and pin 4 GND, right?
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avr300  
#127 Posted : Monday, December 31, 2012 12:59:59 PM(UTC)
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I was a little slow with the attachment. It's here now.
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felipe  
#128 Posted : Monday, December 31, 2012 1:18:55 PM(UTC)
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The pic is perfect, an image is better than 1000 words, really appreciate your help, thanks.
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felipe  
#129 Posted : Monday, December 31, 2012 1:23:40 PM(UTC)
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I can't merasure nothing, the scope signal is blinking lightly without signal in both measurements SCL to GND and SDA to GND, I measured also the I2S input signal at the Sidecar and all three are OK.
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avr300  
#130 Posted : Monday, December 31, 2012 1:49:21 PM(UTC)
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It can be a little difficult to measure with an analogue scope since data is sent in bursts.

This is a trace from a BII. First you see the bursts

Second I have zoomed in on a single burst.

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avr300  
#131 Posted : Monday, December 31, 2012 1:52:04 PM(UTC)
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On my old analogue scope it was seen like this.
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felipe  
#132 Posted : Monday, December 31, 2012 3:29:00 PM(UTC)
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Same scope:

I2S DATA input Sidecar

UserPostedImage

I2S LRCK input Sidecar

UserPostedImage

I2S BCK input Sidecar

UserPostedImage
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avr300  
#133 Posted : Tuesday, January 1, 2013 9:56:13 AM(UTC)
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As long as we are checking whether your microprocessor is working or not, don't concentrate on the I2S lines - only the I2C lines are interesting.

You have to be able to measure some activity at the I2C header. If you can't detect any activity your uP is not running.
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Brian Donegan  
#134 Posted : Tuesday, January 1, 2013 2:38:01 PM(UTC)
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All you need to do to test it is try the volume control pot. If it works, the firmware is fine. If it doesn't, the firmware chip is not functioning.
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felipe  
#135 Posted : Tuesday, January 1, 2013 2:53:29 PM(UTC)
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I can't detect any activity at the I2C header changing some SW2 switches.
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felipe  
#136 Posted : Tuesday, January 1, 2013 3:30:43 PM(UTC)
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Originally Posted by: Brian Donegan Go to Quoted Post
All you need to do to test it is try the volume control pot. If it works, the firmware is fine. If it doesn't, the firmware chip is not functioning.


Thanks Brian I will try.
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felipe  
#137 Posted : Tuesday, January 1, 2013 3:37:37 PM(UTC)
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The volume pot is working.Angel
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Russ White  
#138 Posted : Tuesday, January 1, 2013 5:54:53 PM(UTC)
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Ok, so now if switch on the disable SPDIF autodetect DIP switch - then the DAC should *not* detect SPDIF. If that is true then the port expander is working correctly.

After that, If you set all of the switches to OFF except the REMAP switch then all should be well.

Edited by user Tuesday, January 1, 2013 5:56:36 PM(UTC)  | Reason: Not specified
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jackal29a  
#139 Posted : Wednesday, January 2, 2013 11:10:31 PM(UTC)
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Hi Russ and Brian,

I'm wrtiting on behalf of Felipe because he thinks his English is not good enough to explain himself properly or understand your instructions.

I have gone with him through the integration guide and checked all settings/configs for his setup. All seems to be according to the recommended stereo configuration with the B-III plus Sidecar and 4 way SPDIF board. Still he says SPDIF sounds much louder (2x) than I2S or DSD. Changing SW2 switch #8 seems to have no effect whether it is changed with music playing or changed and then power cycle the DAC. Should channel remaping on/off change increase or decrease output level?

I'm not in the same place (in fact I'm 650+ Km away) so I can't help testing, just translate and, for sake of speed, speak to him over the phone.

Cheers

Javier
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Brian Donegan  
#140 Posted : Thursday, January 3, 2013 1:00:54 AM(UTC)
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Does he use the same software for S/PDIF and I2S from the computer?
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