Hypertherm Powermax1250 Service Manual - Manual (Page 41)

4
MAINTENANCE
3-8 powermax1250 Service Manual
Check the power switch
1. With the power disconnected, set the ON/OFF switch (S1) to ON (I).
2. Check the resistance across the input leads.
3. Check the resistance from the input leads to ground.
Notes: With the power disconnected and the ON/OFF switch (S1) set to OFF (O), all circuits should read as
open. All electrical values shown are ±25%.
2.4 M Ω
2.4 M Ω 2.4 M Ω
>20 M Ω
If no problems were found during the inspection or the initial resistance check, and the power supply still does not
operate correctly, see the
Troubleshooting guide.
Note: The Troubleshooting guide provides most probable causes and solutions. Study the system
wiring diagram and understand the theory of operation before troubleshooting. Before
purchasing a major replacement component, verify the problem with Hypertherm Technical
Service or the nearest Hypertherm repair facility.