Hello, I have a JE Audio HP-20 phono preamplifier and the impedance selector has stopped working.
As a technician I have reviewed it and some components are deleted but it seems to me that the microprocessor is wrong.
As a technician I have reviewed it and some components are deleted but it seems to me that the microprocessor is wrong.
hello all welds checked and it still doesn't work on the main board.
It has several chips:
AT89S52-24PU
02AD LJUB
Z833407E
It could be one of them.