Symbol MC9000-G Product Reference Manual page 451

Table 13-1. Troubleshooting the Mobile Computer (Continued)
Problem
The mobile computer cannot read
RFID tags.
The mobile computer cannot
program RFID tags.
Cause
Tag is damaged.
Tag is not programmed.
Tag type is not supported by
reader.
User is too far from tag.
Wrong tag orientation.
Reader is in a "multi-path"
interference zone.
Tag is damaged.
Tag type is not supported by
reader.
Tag is locked.
User is to far from tag.
Maintenance & Troubleshooting
Solution
Try another tag.
Program tag.
Try an appropriate tag type.
Move to within 10 feet or closer of tag (based on tag
type).
Note: For a successful tag read, the allowable read
distance from the front of the mobile computer's scan
exit window to the tag is .2 ft - 10 ft (.061 m to 3.1 m).
See Figure 2-36 on page 2-61.
"Multi-path" is a radio phenomena caused by radio
waves reflecting from other surfaces, such as
concrete floors or metal shelving, that causes
interference when the reader is at certain distances
from the tag. Moving the reader up or down, or
moving closer or further from the tag eliminates this
interference. In general, reader motion enhances tag
reading abilities.
Try another tag.
Try an appropriate tag type.
Try another tag.
Move to within two feet of tag (based on tag type).
Note: The minimum write distance is 1 foot from the
antenna. Moving closer than 1 foot during
programming can damage the tag and render it
unreadable.
13-7