HP 8640B Signal Generator Restoration Part 1
So, what do we know about this unit?
- It has not been used since at least around 2015 and although I have loads of photographs from the person that this belonged to, none show this unit on or at least in use in any way, so therefore I cannot assume that it worked correctly back then and may have come with faults back then.
- It’s a bit on the messy side, I would even say that this one has had a hard life just looking at the general wear and tear of the external panels and switches, etc, Knobs on the front panel are not default! Two of the control knobs are not the correct colour for the unit and the centre is missing from another, this is not uncommon, but I will want to sort out these little issues so that it will become more interesting to others with regards to selling the unit on once restored. The general look of the unit is tired, obviously lack of use has left the unit covered in dust and looking very neglected, and before I even start to look at the unit it will require a good clean to see what underneath is.
- Wrong Screws! Well, I am not actually sure about this, but they just look wrong, I am on about the four screws in the top cover. I will need to do a bit of investigation as to if these are correct or not.
- The unit would have been second hand to the company that used to own this unit, it has made it’s way to me via at least two individuals, and although 1 of these was very capable of using and operating the unit correctly, I am not sure that the second person had a good grounding in electronics, also then you cannot be sure of other muppets that may have used this unit throughout it’s obvious hard life, so we have to assume that it’s been used by muppets all the way and miss-treated for most of its life.
The lack of ‘Frequency’ control is hopefully nothing more than broken cogs, these units have a bad reputation with regards to the quality of the plastic cogs that were used inside these, So I am expecting there to be a real mess when it comes to the cogs or at least I am secretly hoping that this will be the case as this is a simple fix, well once you have found someone that can either make them for you or you are able to obtain replacement parts from someone, thankfully there is a great HP user group on groups.io that will hopefully put me in touch with wiser and more useful individuals that me.