Looking for Cushman CE-70 Manual or schematic.

[John Barnes]

Hi,
I have a Cushman CE 70 Frequency selective voltmeter. It has a problem
the BFO frequency is not stable. It changes with the front panel
frequency setting, but the PLL doesn't seem to lock properly. Can
anybody help with schematics or a copy of the manual ?

I suspect the 4600 module which is the BFO.

Thanks in advance,

John Barnes