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Hey everyone,
Been on this guys case for...too long now.
ALPINE DRIVER.pdf
It seems that the right channel differential amp is misbehaving. What I notice happen after power up and over the course of a few minutes the voltage at node A swings around 0 to 1 volt before dropping to its correct value, -12 v. Also during this time the voltage at node B swings about from 0 v to 100 mV.
When I leave the amp to idle for some minutes the voltage at node A then drops further to approx - 40 v.
I have replaced
R7134 , 7132, 7130, 7124, 7126, 7128, 7102, 7106, 7108, 7110,
C7110, 7108
Q7102, 7104, 7106. 7108.
ZD7102
Which the astute of you will note is basically all the components applicable to the functionality of this branch of the schematic.
Pain in the ass...hope someone has some insight on this one.
Chur
Been on this guys case for...too long now.
ALPINE DRIVER.pdf
It seems that the right channel differential amp is misbehaving. What I notice happen after power up and over the course of a few minutes the voltage at node A swings around 0 to 1 volt before dropping to its correct value, -12 v. Also during this time the voltage at node B swings about from 0 v to 100 mV.
When I leave the amp to idle for some minutes the voltage at node A then drops further to approx - 40 v.
I have replaced
R7134 , 7132, 7130, 7124, 7126, 7128, 7102, 7106, 7108, 7110,
C7110, 7108
Q7102, 7104, 7106. 7108.
ZD7102
Which the astute of you will note is basically all the components applicable to the functionality of this branch of the schematic.
Pain in the ass...hope someone has some insight on this one.
Chur