Agilent Technologies N5700 Series User Manual page 117

Symptom
No output.
All displays and indicators are blank.
Output is present momentarily, but shuts
off quickly. Display indicates AC.
Output is present momentarily, but shuts
off quickly. Display indicates OUP.
Output voltage will not adjust.
Front panel CC LED is on.
Output voltage will not adjust.
Front panel CV LED is on.
Output current will not adjust.
Front panel CV LED is on.
Large ripple present in output.
No output.
Display indicates OUP.
No output.
Front panel PROT indicator is blinking.
Poor load regulation.
Front panel CV LED is on.
Front panel controls are nonfunctional.
Series N5700 User's Guide
Check
Is the AC power cord defective?
Is the AC input voltage within range?
Does the AC source voltage sag when a load
is applied?
Is the power supply configured for remote
sensing?
Is the power supply in constant current
mode?
Is the output voltage being adjusted above
the OVP setting or below the UVL setting?
Is the unit in constant voltage mode?
Is the power supply in remote sense?
Is the voltage drop on the load wire high?
Over-voltage circuit has tripped.
Display indicates EΠA?
Display indicates SO?
Display indicates O7P?
Display indicates OCP?
Are sense wires properly connected?
Is the power supply in Local Lockout mode?
Service Appendix C
Action
Check continuity. Replace if necessary.
Check AC input voltage. Connect to
appropriate voltage source.
Check AC input voltage. Connect to
appropriate voltage source.
Check if the positive or negative load wire
is loose.
Check the current limit setting and load
current.
Set the OVP or UVL so that they will not
limit the output.
Check the current limit and voltage
setting.
Check load and sense wires connection
for noise and impedance effects.
Minimize the drop on the load wires.
Turn off the POWER switch. Check load
connections. If analog programming is
used, check if the OVP is set lower than
the output.
Check connector J1 ENABLE connection.
Also check SW1 switch setting.
Check connector J1 Output Shut-Off
connection.
Check if air intake or exhaust is blocked.
Check if unit is installed next to heat-
generating equipment.
Check OCP setting and load current.
Connect sense wires according to
instructions in chapter 2.
Turn off the POWER switch and wait until
the display turns off. Turn on the POWER
switch and press the REM/LOC button.
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