Electronics > Repair

HP Oscilloscope Issue

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AardvarkM31:
I purchased a used HP 54600B oscilloscope. I didn't realize but it was missing the brightness adjustment knob. I seen online that there is some common issue with the brightness of the scope failing. The scope seems to work well and the brightness is fine as it is. Without having the knowledge to pull it apart, does anyone know of a fix for that or similar issue that does involve removing the adjustment switch a a visible clue?

Wallace Gasiewicz:
If you can see the stem of the potentiometer in the hole. Just get another knob.
Pics of the 54600 show a knob but sometimes these adjustments are just flat screw heads.
I do not know what your particular damage might be.

oPossum:
The brightness knob is the end of a shaft that extends about 4 inches into the 'scope. The pot it connects to has a D shaft.
 

AardvarkM31:
Howdy Wally,
    Nope, nothing can be seen in the opening. May have to dig deeper....

AardvarkM31:

--- Quote from: oPossum on December 03, 2021, 02:58:06 pm ---The brightness knob is the end of a shaft that extends about 4 inches into the 'scope. The pot it connects to has a D shaft.

--- End quote ---

Hello oPossum,
   So that is what it looks like. Thank you for the picture, I had thought it was a mounted potentiomer and a knob on the outside. That shaft has been removed or is broken inside. Are those parts still even available? Just learning the scope and haven't really realized a problem with the adjustability yet.

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