9
016-562-B0-001, Rev. A (08/2019)
3.0 Troubleshooting
3.1 Troubleshooting Guide
This guide is designed to cover typical problems, causes and solutions for troubleshooting the APP 9005C SPS. Alpha
recommends that the power supply maintenance log accompany units brought in for bench service to aid the technician in
troubleshooting the problem.
Troubleshooting Guide
Problem
Probable Cause
Corrective Action
No output to cable; No AC line
power; Green Output Power
Indicator OFF
AC line cord unplugged
Plug in AC line cord
Generator circuit breaker tripped
Reset circuit breaker and use voltmeter
to verify correct voltage (120/240 VAC) at
receptacle
Incorrect output voltage; And/
or Ammeter reads excessive
current (above rated output of
APP SPS)
Wrong type of voltmeter used
Use true RMS voltmeter
Under-loaded output (less than 1
Amp)
Connect load
Overloaded output
Reduce load
Short exists in load
Locate and remove short
Table 3-1, Troubleshooting
