Dc offset balance adjustment procedure . Many manuals are not specific
I am working on many basic amps
And most manuals don't say which connector is + and which one is -
So you sort of have to guess and search online
Is there a standard convention like positive terminal is mentioned first, negative second
Here is a snapshot of harman 6650r bias adjustment procedure
Which one of them needs to be connected to positive multimeter terminal and which one to negative
Tp407 is definitely negative I think. Black colored cable. 406 and 405 are white and red
The meter polarity doesn't matter for either offset adjustment, or for bias adjustment.
For offset, just connect the meter leads either way and trim to zero.
For output bias, just connect the meter leads either way and trim to the specified magnitude,
ignoring the sign.
But sometimes adjustments allow for from -10mv to +10mv adjustment
On some nakamichi idle needs to be around 24mv.
And variable resistors can adjust from -20 to +30mv
The polarity should then be marked on the pcb, by + for example. But the output bias current
can only be in one direction, so just the magnitude is of interest.
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