Chapter 6 ______________________________________________________________Maintenance 
 
VAISALA______________________________________________________________________ 173 
GSM/GPRS Antenna Maintenance 
The antenna requires minimal amount of maintenance. Field repairs are 
accomplished by changing the complete antenna. 
AC (Mains) Power Supply Unit Maintenance 
The AC (mains) power supply unit requires a minimal amount of 
maintenance. Field repairs are accomplished by changing the complete 
module. 
WARNING 
All electrical installations must be carried by licensed experts. The 
power supply unit transmits electric voltages up to 230 volts. 
 
WARNING 
Do not open the AC (mains) power supply unit.