Anritsu MS420(K) IF board repair / schematics

[Rob.S]

Hello,

I am a new user of this forum. I live in the Netherlands, and I am fond of using (and repairing) older instruments, audio- and RF equipment, including tube equipment.

I have recently purchased an Anritsu MS420K network / spectrum analyzer. It has 2 inputs; the T input works only correct in linear mode.
In log mode I get a display, but the baseline is way too high. Since the IF boards for the two inputs are interchangeable, I have fount the eroor on the T input IF board. I have done a visual inspection and measured the electrolytics and diodes, without finding an error.

Can anybody provide me with a scan of the IF board schematics?

Thanks,
Rob.