Agilent Technologies E4351B, E4350B service manual 2. Overall Troubleshooting sheet 2 of

Overall Troubleshooting (sheet 2)

A From Sheet 1

Voltage display	No
within spec
?

						Check cables from A1
Reads approx. right			A5J722-1	(Vmon)	No	main board to A5 DSP
	No
but outside spec			approx. 4.1V			board.
?		?

Yes

CV

No

Annunciator

on ?

Yes

Yes

Calibrate the supply. See Appendix A in the Operating manual.

See CV/CC Status Annunciator Troubleshooting" paragraph

Yes

Voltage readback circuit on A5 DSP board defective.

Turn off the supply and connect a short across the output terminals. Turn on and program full scale voltage and current using front panel keys. Check output current with an external ammeter.

Output current	No	C	To Sheet4
within spec?

Yes

Current display					Reads approx.
			No				No
within spec?					right but outside
					spec?
						Yes
	Yes
				Calibrate supply. See Appendix A in
					the Operating manual.
					Current readback circuit on
CC Annunciator		No
					A5 DSP board defective
on ?

Yes

D To Sheet3

		Check cables from A1
A5J722-3 (Imon)	No
		Main board to A5 DSP
approx. 4.4V
?

Yes

Current readback circuit on

A5 DSP board defective

Figure 3-2. Overall Troubleshooting (sheet 2 of 5)

10 Service Addendum