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In Reply to: RE: Tuner Problem with Vintage Pioneer SX-626 Receiver posted by HoosierAudio on May 13, 2012 at 08:50:43
Thank you Hoosier, that helps a lot. I thought it might get better as things dried out, but it isn't any better today. I appreciate the help.
Prehistoric 4-Channel Lizard
Follow Ups:
Quadzilla, next thyme try CRC's QD Contact Cleaner for cleaning variable capacitor fins. Available at most hardware stores. Got that tip from AK. 73s para Sactown!!!
Great tip FRG7SWL! The hardware store a few blocks away had two cans in stock. I sprayed the fins once, and it started to come back. I gave it another spray about an hour later, and it looks like it is back to the way it was when I bought it. Thanks a bunch for the advice. I really appreciate it.
Prehistoric 4-Channel Lizard
Edits: 05/13/12
The responses are correct. Spraying cleaners that include oils and/or greases are almost always going to change the tuning of the 100mHz front end tuning capacitor and related fixed capacitors and nearby parts. The dielectric insulation between the tuning capacitor fins is supposed to be air, not some other material. Contaminants of various types can and do change the tuning of the circuits.
Some solvents can be damaging to various plastics and paints/inks used on circuit boards. I would experiment with a small amount on a Q-tip first to make sure it is not going to dissolve the component identifiers on the board or destroy a stryene capacitor etc. on the circuit board. Once you are confident that the solvend is not going to create other problems with circuitry, be watchful of how you orient the chassis to spray the cleaning solvent onto the front end parts. It usually is best to make sure any drips cannot fall onto the front panel or dial area. Those often have plastics that can be damaged by various solvents. You can also fabricate a paper shield and place it such that any overspray is kept away from anything you think might be sensitive to the solvent.
As some noted, the pivot points of the tuning capacitor shaft do need lubrication. Sometimes the old lubrication dries out and has to be cleaned out and then renewed. Do that with suitable solvent and then do not turn the capacitor until you have put new lubrication on the bearing surfaces. Some of these have a ball-bearing drive, so don't attempt to take one apart or you may have a real problem on your hands.
Once the contaminating oils and/or grease are removed from the front end and it has had sufficient drying time the tuning should return to normal.
Good luck!
Joe
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