What action should be taken first during the monthly maintenance of an automatic processor?

Switching the machine off should be the first step during the monthly maintenance of an automatic processor to ensure safety. This action is crucial because it prevents any accidental engagement of moving parts while maintenance is being performed. When the machine is powered down, it eliminates the risk of injury from electrical hazards or mechanical parts operating unexpectedly.

Following this initial step, other maintenance actions such as draining the developer and fixer tanks or removing the rollers can be undertaken safely. Ensuring that the equipment is deactivated provides a controlled environment for comprehensive cleaning and servicing, which is vital for the longevity and proper functioning of the automatic processor.