I recently acquired a PG502 from Tek surplus (aka Country Store) and found several setting to be intermittent. Expecting that a good cleaning would be in order, I was astonished to find that cam switch drum appears to be decomposing. It looks dull, powdery and parched like mud flats after a dessert gully washer!
In fact, there was a lot of fine debris on the contact board. Cleaning the board and the contacts made no difference because the cam lobes are deteriorating. I have not touched the cam drum with any cleaner or other chemicals.
This unit was used in the production test area; perhaps its entire life. It was last cal’d June 2022. Perhaps it is the result of 45 years of continuous up time in a rack.
I have never seen a cam drum look like this.
Has anyone seen such a thing?
(See photo gallery for “Decomposing Cam Switch Drum.”)
