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2nd March 2008, 04:09 AM
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diyAudio Member
Join Date: Jan 2008
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hight idle current HARMAN amplifier
hi ,
I have a pb with a left channel of Harman Kardon pm655 vxi : idle current (vr403) is > 30 mv ( mesuring = 80 mv betheen tp4 and tp5) . typicaly the value is equal to 6 mv on the right channel. after 2 hours Q441 et Q443 falls down . I turn vr403 to minimum : 40 mv VBE voltage on q437 and q439 equal 0 volt ... What is the pb ? very thanks |
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