Ok, it sounds like they are setting the crossover using the bias current, it's a fairly common method in biasing old class AB amps.
I assume that 10mV is measured by measuring the voltage across R22? Is it a 0.22ohm resistor (based on it's colour codes)? I noticed before you said something about it being measured at 0.4 ohm, which was likely just your meter probe resistances adding to the resistor value.
If you are using Ohms law to calc the current based on R22 voltage you need to use I = V/0.22 as that is the resistor's actual value. If the manual says you need 30mA that would be; V = IR (V = 0.030*0.22) = 0.0066v which is very hard to measure correctly, something does not sound right there.
Does the manual have an adjustment procedure (order) to adjust the two trimpots? They look to affect each other which may be the reason you are topping out on one of the trimpots.
If you can provide more info on exactly what the manual says, and exactly how you are measuring it that will help a lot!
I assume that 10mV is measured by measuring the voltage across R22? Is it a 0.22ohm resistor (based on it's colour codes)? I noticed before you said something about it being measured at 0.4 ohm, which was likely just your meter probe resistances adding to the resistor value.
If you are using Ohms law to calc the current based on R22 voltage you need to use I = V/0.22 as that is the resistor's actual value. If the manual says you need 30mA that would be; V = IR (V = 0.030*0.22) = 0.0066v which is very hard to measure correctly, something does not sound right there.
Does the manual have an adjustment procedure (order) to adjust the two trimpots? They look to affect each other which may be the reason you are topping out on one of the trimpots.
If you can provide more info on exactly what the manual says, and exactly how you are measuring it that will help a lot!