Hitachi V-1050 Scope with Frozen Volts/Division Knob

[Roy Batty]

So long, and thanks for all the fish.

[tautech]

I would strongly suspect either:
1. Somebody's been in there and reassembled it incorrectly. Look for traces of not so handywork.
2. The mechanism is broken or jammed by a foreign object.

Careful detective skills required so expect anything and everything. Keep your eyes open while comparing it with the working channel.

Let us know what you find as it will no doubt help others too.

[paul57]

I stumbled on this post that recommends putting a couple drops of paint thinner in there to dissolve the petrified gunk between the metal shafts:

http://forum.allaboutcircuits.com/threads/considering-upgrade-from-crusty-hitachi-v-1050-scope.130614/

My V-1050 has the same problem; I don't have any paint thinner handy but I'll try it next chance I get.  Hope it helps,

-Paul

[cvanc]

I had the same problem on an old HP spectrum analyzer; a couple of the knobs were frozen in their current positions.

In my case the lubricant used on the (concentric) control shafts had petrified over the years.  Solution was to carefully (with a syringe) work a solvent in to break down the old lube and then just as carefully replace with new oil.  Good luck...

[carl_lab]

Some heat by a hair dryer or a heat gun could help to make the lubricant more fluid.
When you can turn the shaft a little bit back and forth, paint thinner can work much better washing off the dirt.