Name: Keysight Infiniium MSOS404A
Brand: Keysight
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Keysight Infiniium S-Series Oscilloscopes

Service Guide

4 Troubleshooting

Troubleshooting Overview 52

Verifying Basic Operation 53

Power Supply Troubleshooting 58

Motherboard Troubleshooting 63

Display Troubleshooting 65

Setting up the BIOS 66

Keyboard Troubleshooting 67

LED Troubleshooting 68

Touch Screen Troubleshooting 69

Checking probe power outputs 70

Before You Contact Keysight 71

Table of Contents5
General Information9
Instruments Covered by this Service Guide10
Accessories Supplied10
Characteristics and Environmental Conditions11
Calibration13
What Is a Calibration14
Running a User Calibration15
Equipment Required15
Calibration Time15
Procedure16
Testing Performance19
Performance Verification General Information20
Performance Test Interval20
Performance Test Record20
Test Order20
Test Equipment20
Vertical Performance Verification21
Input Impedance Test22
Offset Accuracy Test24
DC Gain Accuracy Test31
Analog Bandwidth-Maximum Frequency Test34
Time Scale Accuracy (TSA) Test41
Performance Test Record44
Troubleshooting51
Troubleshooting Overview52
Verifying Basic Operation53
Power up the Oscilloscope53
Check the Display54
Run the Oscilloscope Self Tests54
Run the Keyboard, LED, and Touch Screen Self Tests55
Run a User Calibration57
Verify System Performance57
Power Supply Troubleshooting58
Using the Power Fault Leds59
Types of Faults61
Sequencer Group Faults62
Motherboard Troubleshooting63
Display Troubleshooting65
Setting up the BIOS66
Keyboard Troubleshooting67
LED Troubleshooting68
Touch Screen Troubleshooting69
Checking Probe Power Outputs70
Before You Contact Keysight71
Replacing Assemblies73
ESD Precautions74
Tools Required74
Returning the Oscilloscope to Keysight Technologies for Service75
Removing and Replacing the Rear Cover and Rear Fan Assembly76
Removing and Replacing the Front Panel, Bezel, Keyboards, Display/Touch Screen Assembly, and Autoprobe Board79
Removing and Replacing the Processor Assembly87
Removing and Replacing the Acquisition Board89
Setting the Calibration Factors after Replacing the Acquisition Board91
Removing and Replacing the Motherboard92
Removing and Replacing the Power Supply93
Replaceable Parts95
Ordering Replaceable Parts96
Exploded Views97
Replaceable Parts List102
Theory of Operation107
Motherboard Assembly108
Acquisition Assembly109
Front Panel Assembly109
Safety Notices111
Warnings111
Cleaning the Instrument112
Safety Symbols112

Keysight Infiniium MSOS404A Service Guide

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Brand	Keysight
Model	Infiniium MSOS404A
Category	Test Equipment
Language	English