CHASE HFR2000 Interference Measuring Receiver Manuals ?

[chris_leyson]

Just rescued a CHASE HFR2000 EMC measuring receiver from landfill. Does anybody have a copy of the operating manual or better still a service manual. I don't think CHASE published a service manual so I might be out of luck there. It's 1985 vintage and blows fuses, probably a shorted tant, there are eight of then in the power supply.
I was keen to get into the RF section and have a good look, the top half of the RF section might be a doubly tuned bandpass filter and I think the bottom half of the RF section might be the local oscillator. Can't see any sign of a mixer anywhere or a detector for that matter. Anyway, fix the power supply first.

[chris_leyson]

RF setion top half.

[chris_leyson]

And I guess this has to be the IF section. IC401 is SL612.