Upload some hi res pics of the top and bottom of the boards.i have weird issue i have
two vp 26 and one is fine and working propertly the other one is half quieter even o. the loudest setting i dont know were to start the touble shoot i swaped in diffrent chassis same issue!!!!
doublecheck parts value of feedback resistor R5 being 20K for real (R4 was the part ID from a previous pcb revision), not mistakenly fitted 10K instead ... There are not so many possibilities on this pcb causing a factor 2 or 0.5 error.... the other one is half quieter ...
Resistors cannot be measured with both ends soldered in circuit. You will get misleading results. At this point reading the color bands is the best way.values on the resistors
and their position on the r7 and r8 the values as half of what is supposed!!!
no it neverResistors cannot be measured with both ends soldered in circuit. You will get misleading results. At this point reading the color bands is the best way.
Was this pre working fine at some previous point and then stopped?