Vanguard UPS S2 - Manual (Page 12)

Operating Procedures UPS-S2 
9
APPENDIX A
UPS-S2  Troubleshooting Guide
Item Symptom Possible Problem Solution
1 No output. 1. Power Switch is not on.
2. Voltage selection
AC/DC in is the wrong
position
3. Variac is not set.
4. Output fuse is blown 1. Check Power switch.
2. Check voltage selection
switch.
3. Turn Variac to increase
voltage.
4. Check output fuse.
2 Operating voltage is
120Vac. Cannot get
output voltage above
120Vac Output voltage range
switch is probably in
“LOW RANGE”
Set range switch to “HIGH
RANGE”