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cadence xd1200d
cadence xd1200d
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Old 23rd August 2017, 01:56 AM   #1
ian33 is offline ian33
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Join Date: Jun 2010
Default cadence xd1200d

This amp has no output.Rail and regulated voltage ok. I don't see any oscillation on the outputs.When signal is applied the op-amp with the arrow will head up.I replace it no change.Any suggestion on this one?


http://i1231.photobucket.com/albums/...anks33/cad.jpg

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Old 23rd August 2017, 08:00 AM   #2
Perry Babin is offline Perry Babin  United States
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Which of the opto-couplers has pin 3 directly connected to the secondary ground?
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Old 23rd August 2017, 02:05 PM   #3
ian33 is offline ian33
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U304B It's the second one in the left watching from my pic
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Old 23rd August 2017, 03:28 PM   #4
Perry Babin is offline Perry Babin  United States
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Monitor the voltage across pins 1 and 2 of that opto-coupler from the time you apply remote to about 15 seconds.

Do the same for pins 3 and 4.

Do you get a voltage change after the initial mute delay on both?

What is the voltage before and after the mute delay?
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Old 23rd August 2017, 08:32 PM   #5
ian33 is offline ian33
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Pin 1and 2 during the delay is 0.025 and after is 1.115
Pin 3 and 4 during the delay 80v and after 0.162v
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Old 23rd August 2017, 09:00 PM   #6
Perry Babin is offline Perry Babin  United States
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That's working correctly. When pin 4 goes to near ground, the output stage should be enabled and should begin to oscillate.

Bad solder connections could lead you to transistors that may have run too hot for too long and could be defective.
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