| 摘要 |
PROBLEM TO BE SOLVED: To make difficult entry into an inspection mode even when a user wipes an operation panel by use of a dustcloth, regarding equipment entering an inspection mode with an operation key pressed. SOLUTION: Three operation keys 15 having hidden function for an inspection mode and arrayed in the specific direction are formed out of a 'time/-' key 15f as a central operation key 15, and a 'minute/+' key 15e and 'reservation/ clock' key 15g as operation keys 15 arranged on both sides of the key 15f. The 'minute/+' key 15e is first pressed and then the 'reservation/clock' key 15g is pressed. Thereafter, the 'time/-' key 15f is pressed, thereby allowing entry into an inspection mode. In other words, the 'minute/+' key 15e, the 'time/-' key 15f and 'reservation/clock' key 15g are pressed in a sequence different from an array in the specific direction.
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