| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect the abnormality of a switching element for controlling energizing to a heater. <P>SOLUTION: Before starting the supply of AC voltage to a heating heater 106, a heating heater control part 130 shuts off a safety circuit 102 and sets the switching element 104 to an off-state, and discriminates whether or not an AC voltage detection circuit 120 detects the AC voltage on an AC line 151. When the AC voltage detection circuit 120 detects the AC voltage, the heating heater control part 130 judges it as a situation that the abnormality exists in a heating heater control system and performs display about it on a display part 140. When the AC voltage detection circuit 120 does not detect the AC voltage, the heating heater control part 130 sets the switching element 104 to an on-state and discriminates again whether or not the AC voltage detection circuit 120 detects the AC voltage. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
