2. Pull out the plug module, and replace the plug with a new one.
3. Switch on mains power.
5.6.7
 Checking QSP431
Multimeter
QSP431 is designed to be maintenance-free. If you suspect the unit is faulty, use a
multimeter to check the unit.
1. Verify proper ground contact in all four GND pins.
2. Check that power lines have less than 0.5 Ω resistance.
3. Check that power lines are not shorted to ground.
4. Check that signal lines from X1 to X2 connectors have 15 … 16 Ω resistance.
5. Check that signal lines are not shorted to ground or each other.
Chapter 5 – Maintenance
93
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