how can i obtain a user manual for my vcr sharp vc-h690?

my vcr does not want to record on long play only short play i had taped a show on long play and went to play it back only a blue screen appears with some sought of movement happening but not recogniseable only if you fast forward on the remote control can you see it , so it does tape but not play back. only seems to be on long play and only just happened ok one day not the next.