A Service Manual is likely to be more useful to technicians who are attempting to "fix" a keyboard, but there are some users who also would like to make use of the information in the Yamaha Service Manual. With thanks to Brian Miles, who has collected these manuals over the years, we are able to provide links to a the manuals for a number of Yamaha's keyboards. Generally, these are pdf files, which you can view online or download. There are some listed as zip files. These contain individual parts of the Service manual in pdf format saved in a single folder.