OV at Turn-On Troubleshooting

"OV at Turn-On"

Start

Check that the supply is not programmed to OV at turn-on. Ensure that the voltage setting is not greater than the OV setting. Program 0V and Max. OV, then save the settings in Register 0 (press shift, save, 0 and Enter key). Turn the supply off then back on.

Connect a DC coupled scope across the output terminals. Turn the supply on and check that the output does not momentarily go higher than the voltage setting.

Momentarily goes high

 

Yes

 

?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

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

Turn off the supply and remove the top cover. Disable the OV circuit by lifting A1R447. Turn on the supply and check the output voltage.

 

 

 

 

 

 

 

 

 

 

 

 

Go to "Output Held High"

Output high

 

 

 

 

Yes

 

 

 

 

 

 

 

 

Troubleshooting

?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check A1R447,

 

OV still ocurrs

 

Yes

 

 

 

 

 

 

 

 

 

 

R446, C417

 

?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check voltages at A1U405-7 (TP44), U603-5 (TP17,

 

 

U405-5 (TP42) and U405-3 (TP41) to Common

Check A1U405.

Yes

A1U405-7 approx 5V

(TP9). See Table 6-3.

 

 

 

 

?

 

 

 

 

 

 

No

 

No

 

 

 

 

A1U405-7 approx 5V

Yes

Check A1U411.

 

 

?

 

Check A1R644,

Yes

A1U405-7 approx 5V

 

 

C417.

 

 

 

?

 

 

 

 

 

 

 

 

No

 

 

 

 

Replace A5 DSP board

Figure 3-7. OV at Turn-on Troubleshooting

16

Service Addendum

Page 16
Image 16
Agilent Technologies E4351B, E4350B service manual OV at Turn-On Troubleshooting, OV at Turn-On Start

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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