YuLongDa H02 Installation Instruction page 12

Is vehicle parked in the basement or other places without GSM signal;

 Monitoring the offline area, is signal one offline or all of them, then we can decide
whether it is a telecom operator problem;
SIM card credit run out?

 GPRS service opened?
3. If the GPS function has been activated, and didn't position the location for a long
time, then we shall check the following status:
 When mechanic install the terminal, the GPS antenna signal receive side shall up
to sky;
 Terminal installation place shall have no metal or other material shield which
absorbs electromagnetic wave, also please pay attention that the up-area of
terminal shall not stick any rupture film or heat shield film, cause these films
contains a very high level of metal additive, it will absorb electromagnetic wave, in
this case, the GPS signal will reduced by a large degree which causes lower the
position accuracy, in some seriousness, it might cause the positioning function fail;
4. If the terminal is in the GPS signal weak area (High buildings can block GPS
signal), please drive the vehicle to open sky area to position the location, first
positioning usually take 1-2 minutes;
5. When GSM signal receive abnormally, please check whether the SIM card in
terminal SIM card slot installed correctly, or whether the parking pot was covered
with GMS signal, some place like basement usually have no or weak GSM signal,
please drive the vehicle to places covered with GSM signal;
6. When the bound cellphone receives the main power cut-off alarm, please confirm
if it is a illegal wire cut, or check the fuse box on power wire please, if the fuse
burn out, contact your distributor for the same part number fuse please, after
checking terminal problems, re-power the terminal to work status;