Hello Folks,
I would need some help. Like more than a year ago, I bought a HP 8753C. It arrived from the USA and worked well except for the dreaded ADC LIN error, but smelled really really odd. The smell is difficult to describe - imagine a musky perfume, as worn by some kind of sexy 50yr old female higher officer of a private militia. Alternatively, the sweet smell of a mouldy room in an old brick house - I am sorry, I can not describe it better.
Question 1
So, I merrily took the unit apart and found it covered, almost in its entity, but especially in the PSU, with a brownblack ash like substance. Not dust, but a very fine grained, ash like substance. And lots of it. Picture of it attached here.
At first, I assumed it to be the RIFA capacitors in the PSU. All of these just fell victim to my newly purchased desoldering station (bought just for this one repair), and - to a visual inspection without microscope - look fine.
Does anyone of you have an idea where this ash comes from?
Second question
Also, does it make sense to recap the PSU of the 8753C in its entity? I desoldered one of the three terminal capacitors from Sprague, and the G significantly drops off when going from 1KhZ to 10KhZ on my 4262A. But the capacitance seems the same.
Finally, are there any other things I should snipe while the badboy is open?