I have a analog multimeter 30 years old now and it has developed a fault . On X10K range it is fully adjustable to beyond zero ie the right hand side , but on ranges X1K, X10 and X1 it can only be adjusted up to 2/3 two thirds of FSD ?. On all other functions it works perfectly , does anyone have any suggestions to where i can start to repair this weird fault please.
There is no sign of damage inside the case ie the circuitry .