Hypertherm Powermax900 Service Manual - Manual (Page 39)

M
AINTENANCE
3-12 Service Manual
If no problems were found during the initial resistance checks and the power supply still does not
operate correctly, follow the
Troubleshooting Guide.
Note: In the Troubleshooting Guide are "best-guess" solutions. Study the system wiring diagram and
understand the theory of operation before troubleshooting. Before purchasing a major replacement
component, check with Hypertherm's Technical Service group at 1 800 643 9878 or the nearest
Hypertherm repair facility.
Resistance Check #3 - Fig. 3-10
• Across Output DIode Bridge
Take 2 output diode bridge measurements.
First, place the + multimeter lead on wire 29 and the – multimeter lead on wire 30.
Next, place the – multimeter lead on wire 29 and the + multimeter lead on wire 30.
Values are shown below.
3.5K Ω 1.7K Ω
29
+
29
–
30
–
30
+
Figure 3-10 Resistance Check #3 - Across Output Diode Bridge