- The Voyager Series Instructions say that the contrast keys are , [Σ+]. They don't work for me but  and [.] do. Please fix the docs.
- The contrast scale looks very suspicious to me. Beside the default level "5" only "4" and "6" are somewhat legible, anything below or above makes the display go either blank or black. Is it how the DM42L is supposed to work? I have a new DM15L and its contrast scaling is much finer.