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Chapter 4: Troubleshooting

Under-Voltage Fault

Figure 4-10

This figure shows how to measure the backplane assembly resistance between +12V and ground across Q1409.

If the oscilloscope still will not power on after you have followed the required steps in this

Power Supply Trouble Isolation section (and assuming you have looked through the other two

sections included in this Power Supply Trouble Isolation section to ensure your problem cannot

be fixed there), refer to the Motherboard Verification section in this chapter for additional

diagnosis suggestions.

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 147 148

Service Guide 1
In This Service Guide 3
Contents 5
6 Replaceable Parts 6
7 Theory of Operation 6
General Information 7
Accessories supplied 10
Environmental Conditions 11
Measurement Category 11
Oscilloscope Dimensions 12
Calibration 13
To run the self calibration 15
Testing Performance 17
Performance Test Interval 18
Performance Test Record 18
Test Order 18
Test Equipment 18
• Offset Accuracy Test 20
• DC Gain Accuracy Test 20
• Analog Bandwidth Test 20
Offset Accuracy Test 21
Record the 23
Channel 1 27
DC Gain Accuracy Test 29
Set the Aux Out voltage (V 31
) to +15 mV as follows: 31
Click here and enter 16E-9 37
4 divisions 38
RMS using the expression: 38
Time Scale Accuracy (TSA) 42
Agilent Technologies 45
Troubleshooting 51
Primary Trouble Isolation 54
Self Calibration 56
Chapter 4: Troubleshooting 58
Figure 4-4 58
Under-Voltage Fault 60
Over-Temperature Fault 65
Trigger ICs fan 66
Over-Voltage Fault 68
The second and third 69
LEDs are located 69
Display Trouble Isolation 71
Input Pin # 7 65432 1 73
Front Panel Trouble Isolation 77
Motherboard Verification 78
To setup the BIOS 79
To check the LEDs 85
Software Revisions 86
To check probe power outputs 87
Replacing Assemblies 89
Figure 5-20 102
(Figure 5-35) 110
Figure 5-36 111
Perform self tests 113
Performance calibration 113
Figure 5-41 116
SATA cables 118
Power harness 119
C power 122
12V power 122
Replaceable Parts 127
Exploded Views 129
Chapter 6: Replaceable Parts 130
Replaceable Parts List 133
Theory of Operation 137
Figure 7-1 138
Acquisition Boards 140
Backplane Board 140
Figure 7-6 146

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