I helped a guy out with a repair to his Toshiba SY-355 pre-amp and SC-355 power amp the other day. Essentially it most needed a fuse, 2 new meter lamps soldered in and some pot cleaning.
It all now works well except for the actual meters which don't work. The needles will move if I push them but are not at moving in response to the amp volume. I measured voltage at the PCB wires that lead to the meters and I do get voltage there, up to several volts and varying with the volume control. So it looks like the meters have died.
Other than replacement is there a fix possible? How do meters fail? From being over-driven?
It all now works well except for the actual meters which don't work. The needles will move if I push them but are not at moving in response to the amp volume. I measured voltage at the PCB wires that lead to the meters and I do get voltage there, up to several volts and varying with the volume control. So it looks like the meters have died.
Other than replacement is there a fix possible? How do meters fail? From being over-driven?