July 28, 2024 Day 84
Volume/Brightness control rebuild
From Mike,
The chassis came to me with no brightness/volume/switch control.# That part was a bunch of broken pieces.# I had a control assembly in my parts pile, but in checking it out, the switch was bad and the 1 megohm volume control pot was "open circuit"# The part number for this piece is RCA 102156 which, as far as I can tell is un-obtainable.# If this chassis is going to work again, the control that I have here would need to be re-built.# A very delicate operation.# The problem was the brass rivets that contact the wire lugs to the carbon path of the pot were loose.# So, I had to try something that I have never tried before, and apparently, it worked.
Pix 1# Volume/Brightness/switch loose wires and damaged parts from the original assembly.
Pix. 2,3,4 My control with issues like open 1 meg volume control and bad switch.
Pix.# 5# Pieces retrieved from broken assembly.# These had some usable parts that I used in the re-build process.
Pix. 6 Disassembled for repair.
Pix 7. I started by drilling with a pin vise by hand to remove the brass rivets, but the rivet started rotating so I switched the tooling to Dremel tools. This worked well.
Pix. 8. The repair is a success showing the 1 Meg reading on the ohm meter.
Pix. 9,10.# Details of the #2/56 screws that replaced the rivets that I removed.
Pix. 11.# Control re-assembled and ready to install including the new switch unit.
Next, is to install this unit and then figure out the connections for the crt wires and get them hooked up.# Then, it is time to fire it up and see what we have got.
Cheers,# Mike
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Stay Tuned.