Emerson MPR15 Series - Manual (Page 79)

Maintenance 79
25A Switch Mode Rectifier  NT5C06B / C Installation and User Manual
Fault diagnosis
Symptom: Possible cause
Low Voltage Test/Bypass
LED lit The switch is on the Test/Bypass position
LVA and LVD LED lit Check the voltage level at the test jacks and
the position of the Test switch. Verify the LVA
and LVD adjustment. Set the test switch to the
Test/Bypass position to verify their operation.
Replace the circuit pack if it is still not
operational.
The LVD disconnects the load Verify the voltage at the test jacks. Remove the
faceplate and check the fuse located on the
control PCB.