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Fluke 6060A RF Signal Generator Troubleshooting - No Output <250 MHz

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davefr:
I have a older Fluke 6060A RF Signal Generator.  It powers up and completes self test with no errors.  It seems to function just fine at frequencies above 250 MHz.  But the instant I step it down one notch below 250 MHz output drops to zero. Anyone have one with a similar history.  Any suggestions where to begin the troubleshooting process?  TIA.

Jay_Diddy_B:
Hi,

RF generators like these generate the signals in bands. There are switches that switch between the bands. The symptoms you describe means part of the .1 - 245 MHz signal path is broken.

This is from the manual:




The manual is too big to attach here.

Send me a PM if you can't find the manual.

Regards,
Jay_Diddy_B

TheDefpom:
I repaired a 6060B about 5 years ago back in my very early youtube days, here is the playlist, it might be helpful as I remember a similar issue.

bob91343:
Looks like a problem with the U201 mixer or associated circuitry.

wn1fju:
If I recall, the board layout of the 6060A pretty much followed the block diagram.  Just probe along until you find the culprit.  In my case, I had a problem with one of the amplifiers.  The amplifier used several discrete transistor stages and one of the resistors surrounding the transistors in the amplifier burned up (they were underrated in my opinion and I replaced them with higher wattage versions).

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