User's Manual

10
Common troubleshooting
1.
The connection between the display case and the grounding metal parts should have a
low impedance value. The following tests are carried out to determine whether they
are qualified or not. During the transient interference injection, the voltage drop
between the controller shell and the grounding metal parts is measured. It is required
that the voltage Umax on the shell should not be greater than 0.8V (TTL low level
threshold value) during the whole process of interference injection. According to
some characteristic parameters of interference injection, the required grounding
impedance range is calculated: 0-100MHz. In the frequency band, the impedance
value shall not exceed 60 milliohms.
2.
In addition to the good grounding of the display case, all the input and output
points of sensors, loads and so on connected with the display screen must be closed-
loop, that is, all input and output points must be connected with the display screen
accordingly.
3.
The common reasons for the unsuccessful burning of picture libraries are as follows：

Configuration file does not exist or content error

Naming errors for folders to be burned, files not to be burned, or file naming format
errors

U-disk or motherboard Ontology

Unburnt or version error of underlying program
FCC Statement
Any
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
This device complies with part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including interference that may
cause undesired operation.
FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment .This equipment should be installed and operated with
minimum distance 20cm between the radiator& your body.