Here are the diagrams and repair parts for Official Sony TA-E721 av control amplifier, as well as links to manuals and error code tables, if available.
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No image available - fidelitone diagram
Part #375493121
The manufacturer no longer makes this part, and there's no substitute part
No image available - fidelitone diagram
Part #995718411
The manufacturer no longer makes this part, and there's no substitute part
No image available - fidelitone diagram
Part #146571211
The manufacturer no longer makes this part, and there's no substitute part