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Author Topic: 2-inch machine speed quesiton  (Read 2154 times)

Treelady

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2-inch machine speed quesiton
« on: February 21, 2014, 12:08:05 pm »

This is probably so easy.   But I wanted to ask you guys.  MCI-JCH24.   If you record a test tone, playback is 1.75 cents sharp.   Not using variable oscillator, just fixed speeds. 

I'm sure this is ez peasey and I'm missing something obvious.
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Garrett Haines
Chief Mastering Engineer, Treelady Studios, Pittsburgh, PA
Senior Contributor, Tape Op Magazine

Treelady

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Re: 2-inch machine speed quesiton
« Reply #1 on: February 22, 2014, 10:39:26 am »

Power supply?
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Garrett Haines
Chief Mastering Engineer, Treelady Studios, Pittsburgh, PA
Senior Contributor, Tape Op Magazine

BiigNiick

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Re: 2-inch machine speed quesiton
« Reply #2 on: April 04, 2014, 05:53:50 pm »

i suspect it's in the capstain control card.  there is a circuit in there with an opto sensor on the capstain that has a few adjustments.  you will need a scope and service manual to find the right test point and measure the right frequency and duty cycle.  i've only done this on an JH-110C, but i would assume much of the same ideas are used in both machines.


 - nick

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