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SkyStar-2 polarization voltage

Hello to all,
I have a problem in my skystar2 I can not receivetransponders in the polarization H I measured the voltage of theconnector skystar and change to a transponder in H and the tension was13v. But in the polarization H should have 18v. The skystar does not send the voltage of 18V to switch the polarization of LNB. Does anyone know any solution?
Thanks in advance

Technisat - Skystar2 Rev 2.3

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I have the same problem

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