[Test-Equipment] PS Filter Caps for Model 105 Function Generator??

[Ron Youvan]

> My 105 function generator has developed a problem. When the frequency 
> control is turned to nearly the lowest value, it stops oscillating. To get 
> it to start oscillating again, one must turn the frequency control to a 
> higher setting and then rotate the "Square Wave Only" attenuation control.
/*snip*/
> I've thought that the caps may need to be replaced and that might help the 
> overall problem but not sure. Given the load and the original values, the 
> supply should have some ripple on it and it got me to wondering how much 
> ripple would be acceptable. I can replace these with much larger values with 
> room to spare and it will reduce the ripple significantly; however, I wonder 
> if this is just a waste of time.

   I would guess it's one or more bad electrolytic capacitors, but not in the power 
supply, although those need checked also.  Test with a good in circuit capacitance ESR 
meter if you can then if that doesn't locate it, for capacity.  Or just replace them all.
-- 
    Ron  KA4INM - I'm proud to be Chuck's pop!