My 8596E spectrum analyzer suddenly failed. The fault is manifested as the interference of various random frequencies on the frequency spectrum, similar to the interference of a single carrier. In order to troubleshoot, I replaced the intact A8 Power Supply, A7 Analog Interface, A15 Motherboard, A9, A11, A12, A13, A14, A25 and all A3 RF part, but still can’t eliminate the fault, so is the fault caused by A16? ?
What caused it?