Canon iPF720 Service Manual page 50

Chapter 1
The carriage is mechanically locked by the lock arm in the purge unit at the same time as the printhead caps itself at the end of printing.
Before shipping the printer, secure the carriage at the home position with a belt stopper so the carriage won't be damaged when it is released from the lock arm
or inks won't leak during transit.
c. Contact of Linear Scale/Carriage Shaft
Please do not touch a linear scale and the carriage shaft when the inside of the top cover is opened, and execute maintenance.
When touching a linear scale and the carriage shaft, it might cause defective movement of the carriage and a defective print.
[1] Linear Scale
[2] Carriage Shaft
d. Handling maintenance cartridges
Be careful in unloading a maintenance cartridge from the printer not to keep the used ink from spilling over.
e. Refilling the printer with inks
If the printer has been purged of inks through an automatic or manual ink drain for disassembly/reassembly or for reshipping, refill the printer with inks as soon
as possible after the completion of the work.
If residual inks in the printer dry, they could seize mechanical components, with the result of malfunctioning.
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[1]
[2]
F-1-24