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TC Electronic digital delay

8/11/2012

1 Comment

 
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I am repairing one of these for a studio. There is an intermittent fault where the unit doesn't power up at times. The power supply is linear so it should be easy to solve, but so far has eluded myself and Guy (another tech.). It suddenly comes to life with the slightest provocation, but there are no dry joints, or loose connectors to be found. Puzzling - I'll keep on the case.
The TC 2290 is no longer made (they started in the 1980s) but they are still considered by many to be the pinnacle of digital delays - both for the sound quality, and all the features. I think this was the first delay to have 'tap tempo'. It is named Learn, and samples the delay between two pushes of the Learn button.
There is a website dedicated to the 2290 here.


1 Comment
Richard
16/11/2012 01:28:28 pm

After a week on the bench a fault pattern emerged: the unit would not power up at first in the morning, but that would change as soon as I started probing around. I established that the secondary voltages from the power transformer were ok. Once the unit powered up it would continue to stay on, and would power up straight away if I turned it off and on again. After a week I located the problem to be dirt on the connection of a FFC (flexible flat cable) that went from the motherboard to an extension interface and memory board. Although a good quality sliding ZIF connector is used to terminate the FFC some dirt had built up over 20 years. A clean with IPA fixed it. Two expansion boards had to be removed to access the faulty connector on the motherboard.

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    Author

    Richard Hallum
    NZCE, MMusTech, Dip Tch (Ter).
    memberships: APRA, AES, 
    NZ Acoustical Society, ALMA.

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