Output Held Low Troubleshooting sheet | Agilent Technologies E4350B

Output Held Low Troubleshooting (sheet 1)

"Output Held Low"

Start

The supply’s output is low and the PROT annunciator is not on. Turn supply off, disconnect the load and remove the top cover. Turn the supply on and check the secondary bias and reference voltages (TP’s 9 through 12 See Table 6-3).

Caution: During these tests, the output may be at hazardous levels.

		Troubleshoot the defective
Voltages OK	No	Troubleshoot the defective
Voltages OK	No	curcuit. See Fig. 6-5 Sheet 1.
?		curcuit. See Fig. 6-5 Sheet 1.
?

Yes

Check that the +Rail and -Rail Voltages are correct. See Fig. 6-5, Sheet 1.

		Check power xfmr T1 ac
Rail Voltages OK	No	voltages, input rectifiers and
Rail Voltages OK	No	voltages, input rectifiers and
?		filter caps. See Fig. 6-5 Sheet 1
?		filter caps. See Fig. 6-5 Sheet 1

Yes

Program full scale voltage and current, measure output with an external DMM to insure the problem is no a power supply readback problem. Check voltages is approximately -4 volts at A5J722-15 (TP25) and A5J722-16 (TP24) with respect to commmon (TP9).


Voltages OK	No	Replace A5 DSP Board
Voltages OK	No	Replace A5 DSP Board
?
?

Yes

Check if CV/CC "OR" Gate diodes A1D441 or D413 are conducting.

A1D411 Conducting

ATo Sheet 2

Yes

CV Comparator

A1U408

Check Vmon voltage at A1U401-7 (TP33) to common (TP9).

A1D411 Conducting

VMon Amp A1U401

defective

Figure 3-8 Output Held Low Troubleshooting (Sheet 1 of 2)

Service Addendum

E4351B, E4350B specifications

Agilent Technologies, a leader in electronic measurement, offers a range of advanced solutions, including the E4350B and E4351B switching systems. These models are specifically designed to meet the increasing demands of modern testing environments, providing high reliability and precision for a variety of applications.

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