Focusrite ISA110 Service

Hello!
I want to Service my Focusrite ISA110 Modules (Rackversion).  Could anyone help me out with a Service Manual?

Best regards,
Frank

What seems to be the problem? Schematics are available on the web.  But what is the issue with the unit?

Hi
I have noise on the Line Input, but not with Mic Input.
I could not find any Service Manual in the Internet...

o.k. is the noise with or with out eq, filters, etc.

you could run a scope and probe until you find where the fault in the circuit is.
since it is on the line input side only,  there is very little before the relay switching between mic and line

Stating off with the transformer, it feeds into a 5534.... if my notes are correct check around ic4. Out of  ic4 it feeds a coupling cap and then to the relay.

Thanks! I will check that out! It would be still cool to get some Schematics, because it seems that someone befor was working on it.
I have some NE5534 with missing legs in the Module....? (Pin 5+8)
Noise is without Eq and Filters, I can get it out with the Filters, but this can't be the way...

the legs should no be missing. The schematic shows them in use and a cap across them.

Schematic? Can I see it?

No to be a dick but that's an easy one.

http://lmgtfy.com/?q=isa110+schematic

Hi again!
In the meantime I had the chance to have a look to the whole ISA110 Schematic, the one who was installed in a Desk, not a Rack.
I have a question about the Insert section, pre & post EQ. Do I see it right that this is a unbalanced send-return Connection?
Pinout here at the secondlast Page.
https://d2zjg0qo565n2.cloudfront.net/sites/default/files/downloads/7197/isa-110-115-user-guide1.pdf

Thanks for Feedbacks!

yes that is quite common in desks.