| 摘要 |
A circuit for indicating fault states comprises; a chamber state indicator section (5) including LEDS (D2-5) for alarming abnormal state, a door state alarm LED (D3), a normal state indication lamp (NORMAL), and a buzzer (BZ); an amplifying section (3) including a transistor (TR1), buffers (2,2'), a microprocessor (1), amplifiers (A1-4), sensors (F, DF, R) for detecting each chamber state; and a comparator section (4) including amplifiers (A5-8), condensers (C2-4) , and a diode (D7). When a certain part is abnormal, a diagnosis code showing a fault place blinks a lamp and when the part checked is normal, the checking for abnormality passes to the next stage in sequence.
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