Table 8-4 Radio specifications (continued)
Characteristic Specifications
LTE FDD B1/B2/B3/B4/B5/B7/B8/B12/B13/B18/B19/B20/B25/B26/B28
LTE TDD B38/B39/B40/B41
UMTS B1/B2/B4/B5/B6/B8/B19
GSM B2/B3/B5/B8
Current limitations
These limitations may be removed in future.
● Radio communications interference may occur while the robot is printing, causing some lines not to
be printed.
● Characters and graphics have a minimum size, which is 12 mm (0.5 in) for characters. They cannot be
printed successfully if smaller.
● Elements cannot be printed within 20 cm (7.9 in) of an obstacle.
Currently, there are certain surfaces that can mistakenly trigger the detection of a cliff and cause a
safety stop. These known surfaces are the following:
● Reflective surfaces: Extremely reflective surfaces such as mirrors, polished metal or any other
highly reflective surfaces.
● Dark surfaces: Dark spots, obscure surfaces, and dark colors can accidentally activate the safety
stop. Screens from mobile devices can also trigger this safety detection.
● Water puddles: In certain weather conditions, puddles can act as a mirror and activate the safety
detection.
There are several possible workarounds if a false-positive safety stop is triggered.
If SitePrint stops during a job and the four sensors are not emitting light, perform the following checks:
1. Check if any area around the robot has a dark/reflective spot.
2. Pick up the robot with the handle and move it away from the specific area. The drive wheels are
disabled, so manual control is not available.
3. If you need to control the robot manually after relocating, press the SELECT button on the remote
control.
4. Drive the robot away with the joystick and resume printing.
NOTE: It is not necessary to restart the robot if it stops. Relocating it from the spot will restore its
functionality.
To mitigate behavior in conflictive areas, the following actions can be taken:
● Cover potentially conflictive spots and dark surfaces.
● Define potentially conflictive areas in the job site as obstacles in the HP SitePrint user interface.
72
Chapter 8 Robot specifications
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