Question about Televison & Video
Tape plays at high speed(approx 2x-5x), both video and audio with auto
tracking not locking in and manual tracking ineffective. In
addition, there is a ratcheting noise due to a toothed cam under the
casette carriage not meshing correctly with its mating toothed wheel
but not due to damaged teeth on either component. The cam appears
to be pushed towards the wheel but is lightly spring loaded against it
and basically bounce out of mesh from time to time. This occurs
on both reccord and playback modes.
Any suggestions would be welcomed.
The tape speed is controlled by a pinchroller arrangement; one rubber covered idler, and a metal drive roller with the tape between them.
There is tension of the take-up reel that will pull the tape faster than it would normally travel if the described rollers are doing what they should.
You might try removing the rubber idler (normally one small Phillips) and stripping the surface with something fairly aggressive such as lighter fluid or alcohol and an old rag.
If you get a good bit of black deposits, that may be enough to restore some tackiness to it and therefore function.
If you are handy and curious, you can take a cartridge with problems, remove the tape from the reels, cut out most of the closed side of the cassette, put a rubber band between the two empty reels and make a test cartridge that might let you see what function the various gears perform.
I still have one so prepared in a box of other homemade fixtures I used years ago.
A box I didn't bother to unpack since the repair of these is no longer fiscally sensible.
Posted on Aug 18, 2008
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Posted on Jan 02, 2017
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