hp slider switch replacement or recyclers

What is a HP 8505A?

I is a vector network analyzer circa 1982. The switch is a slider. I am not sure what else they may have been used. I would bet they were common in that era.

- Dan

Michael A. Terrell wrote:

Do you have the service manual? A part number would make it easier to find.

dansawyeror hath wroth:

Which switch? I see several on the front panel:

As I vaguely recall, there is no switch assembly. The contacts are gold plated traces and large pads on the circuit board. The plastic slider has one or more spring loaded contacts inside. The usual problem is that the plastic slider become brittle with age and just crumbles. Usually the tapered handle that goes through the front panel is what breaks off. Is this what happened to yours? If so, think about taking it apart and just attaching a different handle. The rest of the switch assembly is just fine.

For hp test equipment parts and pieces, see:

I couldn't find any switches.

Thanks for the reply. No the actual contact sliders came loose from the plastic slider. The copper/gold plating is fine. Upon inspection two of the slider assemblies are broken.

- Dan

Jeff Liebermann wrote:

This is a standard problem with lots of HP equipment of that vintage. What we have done is to tap 0-80 holes into the plastic and then reattach the slider to the plastic. I have probably done this fifty times and I have never had one break a second time. The design was not good and the plastic nipple would break off. Any older parts you get would end up with the same problem more than likely.

Doug,

Thanks, I will look into that. Are there 0-80 screws?

- Dan

doug wrote:

Doug,

Thanks, I will look into that. Are there 0-80 screws?

- Dan

doug wrote: