Power-on sequence and AC/DC voltage checks

Hazard: removing the covers of the console monitor or the X-ray high-voltage generator in the gantry, exposing the high-voltage sections inside

Consequence: accidental contact may occur, causing electric shock and possibly death

Avoidance: do not remove the covers of the console monitor or the X-ray high-voltage generator in the gantry

Hazard: connecting a measuring instrument (e.g. an oscilloscope) to a circuit of the floating section — such as the DRV PWB or the inverter PWB — without an isolation-rated probe, or leaving the probe cable dangling once connected

Consequence: may cause shock or short-circuit with the exposed GND section of the connector; failure to observe these precautions may also result in damage to the system

Avoidance: use a differential probe or isolation probe; do not leave the probe cable dangling when the probe is connected to the measuring point; note that when several measuring points are monitored simultaneously with one oscilloscope, the ground levels of the probes become common

Hazard: 200 V applied to the primary (upper) side of MC5 whenever NFB2 is ON, encountered at the time of a continuity check

Consequence: electric shock

Avoidance: be extremely careful regarding electric shock during the continuity check; the MC5 cover is provided for safety — do not remove it unless absolutely necessary

Hazard: gantry rotation remaining possible via SW120 even while the interlock mechanism is activated

Consequence: a person being caught in the rotation section

Avoidance: turn SW120 OFF before performing an operation with the front cover open or when touching the rotation section while power is supplied; turn SW120 ON only when it is absolutely necessary to rotate the gantry with the front cover open