Canon imageCLASS MF4140 Basic Manual page 23

M Error indicator
Flashes when an error has occurred.
N Processing/Data indicator
Lights when the machine has waiting jobs.
O [Start] key
Press to start copying and scanning.
P Numeric keys
Enter numbers.
Q [Clear] key
Press to clear entered alphanumeric characters.
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R [ ] key
Press to increase the value for various
settings. Also press to see the next item in
the menu.
S [OK] key
Press to accept a set function or mode.
T [ ] key
Press to decrease the value for various
settings. Also press to see the previous item
in the menu.
U LCD display
Displays messages and prompts during
operation. Displays selection, text, and
numbers when adjusting the settings.
V [Toner Gauge] key
Press to check the toner remaining in the
toner cartridge.