The power supply model 121 can works at 230 or 115Vac.
If you want to use the power supply for 115Vac you have to proceed as follows:
•
Input voltage must be disconnected from the supply before to open the device.
•
Remove carefully the rear cover of the power supply.
•
Remove the bridge marked as "230" (Figure 3).
•
Weld the bridges marked as "115" (Figure 4).
•
Change the 100mA fuse for a 200mA fuse.
Disconnect the input voltage.
•
Remove the front cover from the power supply.
•
Press down gently on the cover of the fuse
holder, and turn counter-clockwise (Figure 5).
•
Pull out the cover and fuse, replace fuse with a
new one.
•
Re-install fuse and cover as an assembly, press
down gently and turn clockwise.
•
Replace the front cover on the power supply.
INPUT VOLTAGE SELECTION
FUSE REPLACEMENT