i've this problem on my Tek 495P.
When i start the calibration routine,with the internal generator 100Hhz -20 dB,the routine fails because the processor says taht there is any signal calibrator is present.
I've checked the output signal at 100Mhz -20 Db and is ok.
So i've connected to rf input an external RF generator at 100MHZ and the test start only when i give a signal @ 100Mhz 0(zero) dB.
Seem to be a loss of gain.
What can i verify in the instruments for repair this loss of gain?
Thanks for Any help.