MTI ATU2000 / STR400

Richard, G4ANN, is looking for information on an Automatic ATU that he is hoping to repair and use on HF. The label says that it is made by (or at least Marketed by) Marine Technology International Ltd. It has markings STR400 and ATU2000 on the cover.

Outside and internal pictures are shown below.

If anyone has any information on this ATU, particularly a circuit diagram and/or a manual of some sort, please can you email (stewart at g3ysx.org.uk), or add a comment on the blog.

Thanks in advance for any help

Stewart/G3YSX