Just in case it is an S680 this is how the clock is set, its difficult to explain as illustration pictures are shown in the manual, however this is the best I can interpret.
Press and Hold selector for more than two seconds.
"Clock H" or "Clock M" , "SCM link" or "Level" appears on the display.
To Set the Hour
(1) Select "Clock H" if not shown on the display using the up/down arrows
shown on the buttons on the extreme right hand side of the fascia.
(Goes through Clock H ---Clock M----SCM link----Level then goes back to Clock
H)
(2) Adjust the hour by turning the outside of the selector on the Left hand
side of the fascia.
To Set the Minute.
(1) Select "Clock H" as described above.
(2) Adjust the minute using same procedure as above.
Press "Select" to finish the setting.
