Here are the diagrams and repair parts for Official AT&T 3400 telephone equipment, as well as links to manuals and error code tables, if available.
There are a couple of ways to find the part or diagram you need:
Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.
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For DIY troubleshooting advice and repair guides, visit our repair help section.
#NI
All parts diagram
Part #E
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Part #14R
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Part #MPE16
The manufacturer no longer makes this part, and there's no substitute part
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