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[Plush]

We are searching for a good tech to service a
Studer 962 console.

We are in Chicago, but it does not matter where
the repair work will take place. (must be in USA)

Does anyone here have a suggestion?

Thank you,
Plush  

[Mark Donahue]

Plush wrote on Thu, 11 August 2005 10:22

We are searching for a good tech to service a Studer 962 console. We are in Chicago, but it does not matter where the repair work will take place. (must be in USA) Does anyone here have a suggestion? Thank you, Plush

Dear Hudson,
What is the problem with your 962?
They are pretty easy to trouble shoot without having to send the entire console out for service. You can test if it is input module problems by removing all the modules and inserting them one at a time to test. Same with the output modules. The switching power supplies have been known to fail on occasion, but unfortunately, we have found that it is much easier to send your bad one to Studer and get a replacement. They are still readily available and parts are plentiful. We keep a spare one on hand at all time. It is a 10 min procedure to change the PSU. The manual is very well written, like most studer manuals, and includes a full set of schematics. If you didn't get one with your console, I would definitely look around for one.
All the best,
Mark

[Plush]

Hello Mark,
Thank you for your reply.

The problem noted on this console is no bass sound
when playing back through line inputs.

It has been mentioned to me that perhaps failing capacitors somewhere in the chain would act on the system making it sound as if a high pass filter is engaged.

We will test each module as you suggest and hopefully track down the source of the problem. I did check with your office and found that no recommndation was forthcoming for a tech person familiar with this console.

Thank you,
Hudson Fair
 

[Mark Donahue]

Hudson,
Which line inputs are you talking about? THe line inputs on the normal input module is actually transformer coupled. There are some interstage coupling capicitors in the circuit, but I haven't seen these fail more than once or twice in the last 15 years.
Now, the inputs on the master modules are a different story, these, like the insert return are electronically balanced, and do incorporate coupling capacitors. One of the mistakes that people make is to connect the insert return through the insert send  connector. The problem with this is that the signal is normaled through to the return, but is looking at the output of the insert send, which causes frequency anamolies and gradual onset distortion.
Now, the other question is how are you feeding the line inputs? Balanced or unbalanced? If you are feeding an unbalanced source into the transformer coupled inputs and are not shorting pin 3 to ground, then this would cause the failure mode you describe. Grungy input and no bottom.
One thing to remember about the 961/962 consoles is that all the outputs, whether electronically balanced or transformer coupled, behave in the same way. You need to ground the unused pin when feeding an unbalanced destination. Studer uses a Transformer-like cross-coupled electronically balanced outputs on all the outputs that are not actually transformer coupled. This makes it easy to hook up because all the outputs behave the same.
All the best,
Mark