Hello, I´m having a hard time trying to figure out how to measure DC Offset on an Linear Class D amplifier. Usually it is indicated to measure on certain test points between two transistors on class A/B and it is usually in 10~25mV range.
From this device Service Manual I understood the following:
Disconnect speakers, Volume to minimum, no input, Disable Speaker terminal B and enable terminal A, measure at terminal A RED (+) and BLACK (-) and adjust using R5022 and R5021 untill it is either 0V or in tolerance of +/-10mV.
What i get as reading is 220mV for LEFT and ~170mV for RIGHT (Where right starts at 0 and climbs up on its own).
When trimming i get no difference in values, not down nor up, even when i close or open the trimmers all the way.
(EDIT - Measures the same with Speakers connected)
Can anybody guess what the problem might be, could it be bad trimmers?