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** DUCT OVERPRESS - The pressure in the duct is too high. Check for clogs in the duct. | ** DUCT OVERPRESS - The pressure in the duct is too high. Check for clogs in the duct. | ||
** BATT LOW - The backup battery in the PLC is low. Replace it or contact the operations team to do so. | ** BATT LOW - The backup battery in the PLC is low. Replace it or contact the operations team to do so. | ||
=== Mirror misalignment (double laser beam or only cutting on one side of bed) === | |||
* The first mirror (on the left of X carriage) has been going out of alignment recently for unknown reasons | |||
* This causes the laser to hit the second mirror (on head) off-centre | |||
* '''Get help from someone who has fixed this before!''' | |||
* Paper masking tape and firing laser on the minimum power level for a second can be used to see where the beam actually hits | |||
* [[File:Laser_alignment_fail.jpg|200px]] | |||
* Realignment procedure | |||
** Parts diagram: | |||
** [[File:Laser_first_mirror_alignment.jpg|200px]] | |||
** Loosen the two locking setscrews | |||
** Rotate mirror a fraction of a degree | |||
** Check alignment by firing at tape | |||
** Repeat until laser hits the same spot on the opening for the second mirror when the head is at leftmost and rightmost positions along the slide | |||
** Slowly snug setscrews to fix position | |||
** Re-check alignment | |||
** Repeat whole process if needed | |||
== Materials Reference Tables == | == Materials Reference Tables == |