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Old 23rd October 2013, 07:14 AM   #1
quan is offline quan  Australia
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Default HPA-nvX200 signature modules

Hi Anthony, i installed the modules today but one of the chanel has an DC off set of 0.435 V and the other chanel is 13mV. I am using the PSU three and two 35VAC transformers. Please help me to trouble shoot the problem.
Many thanks
Quan
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Old 23rd October 2013, 10:50 AM   #2
quan is offline quan  Australia
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I test the module off chassis showed Dc offset only 10mV!!!. I wonder whether the issue is grounding rather than the module at all. Should the heatsink be grounded?.
Quan
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Old 23rd October 2013, 10:55 AM   #3
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Quote:
Originally Posted by quan View Post
I test the module off chassis showed Dc offset only 10mV!!!. I wonder whether the issue is grounding rather than the module at all. Should the heatsink be grounded?.
Quan
Hi Quan

If it measures OK off the heat sink, check the that the VBe device between the
output devices has been insulated from the heat sink.

Cheers

Anthony
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Old 23rd October 2013, 11:04 AM   #4
quan is offline quan  Australia
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Sorry Anthony , the module was tested mounted on the heat sink but not within the chassis then the DC offset was fine ie 10mV. But once fully installed in chassis with speaker protection unit LSP then the DC offset measured 0.435V.
Quan
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Old 23rd October 2013, 10:08 PM   #5
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Originally Posted by quan View Post
Sorry Anthony , the module was tested mounted on the heat sink but not within the chassis then the DC offset was fine ie 10mV. But once fully installed in chassis with speaker protection unit LSP then the DC offset measured 0.435V.
Quan
Quan have you earthed the main power supply to mains chassis earth?

Anthony
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Old 23rd October 2013, 11:45 PM   #6
quan is offline quan  Australia
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Hi Anthony, yes i did earth the PSU to main chassis earth.
Quan
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Old 24th October 2013, 01:15 AM   #7
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If you take the LSP out of circuit by unplugging the output of the nxV200,
does the the DC offset return to normal?

Anthony
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Old 24th October 2013, 02:17 AM   #8
quan is offline quan  Australia
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Thanks Anthony, i was thinking of doing that. Will check that tonite and report back.
Quan
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Old 24th October 2013, 10:01 AM   #9
quan is offline quan  Australia
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Hi Anthony, i measured the DC offset direct without the LSP now reading 0.455V instead.
Quan
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Old 26th October 2013, 04:55 AM   #10
quan is offline quan  Australia
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I have tried to re secure the earth arrangement but still not making any difference to the DC offset of the right chanel -showing 0.45V still compare to 13 mV of the left chanel. Not sure what else to do now?. Any ideas guys? Even without source or preamp connected when the power amp turn on the speaker cone went crazy.
Quan

Last edited by quan; 26th October 2013 at 05:09 AM.
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