Agilent Technologies 5747A Symptom Check, Does the AC source voltage sag when a load is applied?

Service Appendix C

Symptom Check Action

No output.

All displays and indicators are blank.

Is the AC power cord defective?

Is the AC input voltage within range?

Check continuity. Replace if necessary.

Check AC input voltage. Connect to appropriate voltage source.

Output is present momentarily, but shuts off quickly. Display indicates AC.

Does the AC source voltage sag when a load is applied?

Check AC input voltage. Connect to appropriate voltage source.

Output is present momentarily, but shuts off quickly. Display indicates OUP.

Is the power supply configured for remote sensing?

Check if the positive or negative load wire is loose.

Output voltage will not adjust. Front panel CC LED is on.

Is the power supply in constant current mode?

Check the current limit setting and load current.

Output voltage will not adjust. Front panel CV LED is on.

Is the output voltage being adjusted above the OVP setting or below the UVL setting?

Set the OVP or UVL so that they will not limit the output.

Output current will not adjust. Front panel CV LED is on.

Is the unit in constant voltage mode?

Check the current limit and voltage setting.

Large ripple present in output.

Is the power supply in remote sense?

Is the voltage drop on the load wire high?

Check load and sense wires connection for noise and impedance effects.

Minimize the drop on the load wires.

No output.	Over-voltage circuit has tripped.
Display indicates OUP.

Turn off the POWER switch. Check load connections. If analog programming is used, check if the OVP is set lower than the output.

No output.	Display indicates EΠA?	Check connector J1 ENABLE connection.
Front panel PROT indicator is blinking.		Also check SW1 switch setting.
	Display indicates SO?	Check connector J1 Output Shut-Off
		connection.
	Display indicates O7P?	Check if air intake or exhaust is blocked.
		Check if unit is installed next to heat-
		generating equipment.
	Display indicates OCP?	Check OCP setting and load current.

Poor load regulation.	Are sense wires properly connected?
Front panel CV LED is on.

Connect sense wires according to instructions in chapter 2.

Front panel controls are nonfunctional.	Is the power supply in Local Lockout mode?	Turn off the POWER switch and wait until
		the display turns off. Turn on the POWER
		switch and press the REM/LOC button.

Series N5700 User’s Guide 117