Just fixed my Yamada 9000H with a Sony dru190A DVD writer (from Amazon here: http://www.amazon.co.uk/Sony-DRU-190A-Internal-DVD-RW-Retail/dp/B000Y1FO5G).
Apparently this is a rebadged Liteon and the Yamada is also Liteon ...
I connected the DVD to my PC first, loaded a DVD to set it (automatically) to region 2, removed the front plastic plate and drawer front and it fits into space left by removed DVD writer from the Yamada.
Used araldite to fix it to 4 base posts and bent the front metal clips in the 9000H to fit the new writer.
Hey presto works like a charm!
Ray
March 2009