Agilent Technologies Infiniium 90000 A User manual

Service Guide
Publication Number 54913-97022
March 2013
©Agilent Technologies, Inc. 2007-2013
Infiniium 90000 A-Series Oscilloscopes

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Agilent Infiniium 90000 A-Series Oscilloscopes at a Glance
Ease of use with high performance
The Agilent Infiniium 90000 A-Series
oscilloscopes combine unprecedented ease-of-
use with high-performance digitizing
oscilloscope functionality tosimplifyyourdesign
and analysis measurement tasks.
• Traditional oscilloscope front-panel
interface provides direct access to the
controls needed for most troubleshooting
tasks.
• Graphical user interface with menus,
windows, dialogs, and toolbars provides
easy access to dozens of configuration and
analysis tools, ensuring you can set up and
make the most complex measurements.
• All models offer 40 GSa/s sampling rate on all
four channels.
• Models with bandwidths from 2.5 GHz to
13 GHz.
Display shows waveforms and graphical
user interface
• Graphical interface allows direct interaction
with waveforms, including drag-and-drop
positioning and instant waveform zoom.
• Touchscreen display allows oscilloscope
operation without an external pointing
device.
• Waveforms displayed in color, making
correlation easy.
• Current configuration parameters displayed
near the waveform display and are color-
coded to make identification easy.
• Graphical interface menus and toolbars
simplify complex measurement setups.
Horizontal controls set sweep speed and
position
• Main sweep speeds from 5 ps/div to 20 s/div.
• Zoom mode is from 1 ps/div to main time base
setting.
• Intensified waveforms on main sweep
window make it easy to see what will appear
in the zoom window.
Acquisition and general controls start and stop
the scope and do basic setup
• Run and stop controls for continuous or single
acquisitions.
• Clear display before one or more
acquisitions.
• Default setup and Autoscale set initial
configuration.
Hard disk drive and USB 2.0 port for saving and
restoring setups and measurement results
• Store measurement displays for inclusion in
reports and test setup guides.
• Store oscilloscope setups to repeat tests
another time.
• Hard disk stores oscilloscope operating
system.
Trigger setup controls set mode and basic
parameters
• Select Edge, Glitch, or Advanced Modes.
• Choose input source and slope.
• Use graphical user interface to simplify
configuration of pattern, state, delay, and
violation trigger modes.
• Use auxiliary trigger to increase triggering
flexibility.
Vertical controls set attenuation, and
position
• Input attenuation adjustable from 1 mV/div to
1 V/div.
• Color-coded knobs make it easy to find the
controls that affect each waveform.
Marker and quick measurements help
measure waveform parameters
• Waveform markers A and B to check voltage
or Δ-time at any point on the displayed
waveform.

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In This Service Guide
This guide provides the service documentation for the Agilent Technologies 90000 A-Series
oscilloscopes. It is divided into seven chapters.
Chapter 1, "General Information," describes which oscilloscope models are covered by this
guide, environmental requirements, and oscilloscope dimensions.
Chapter 2, "Calibration," explains how and when you should run the user calibration procedure.
Chapter 3, "Testing Performance," provides information about testing the oscilloscope to verify
that it performs according to specifications.
Chapter 4, "Troubleshooting," provides information about how to identify defective assemblies.
Chapter 5, "Replacing Assemblies," provides instructions for removing and replacing defective
assemblies.
Chapter 6, "Replaceable Parts," provides exploded parts diagrams and a list for ordering
replaceable parts.
Chapter 7, "Theory of Operation," briefly describes the internal operation of the oscilloscope.
At the back of the book you will find safety notices.

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Contents
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1 General Information
Instruments covered by this service guide 8
Performance-Enhanced Versus Standard Models 9
Accessories supplied 10
Specifications and Characteristics 10
Environmental Conditions 11
Measurement Category 11
Oscilloscope Dimensions 12
2Calibration
To run the self calibration 15
3 Testing Performance
Performing Self-Test and Calibration 19
Offset Accuracy Test 21
DC Gain Accuracy Test 29
Analog Bandwidth - Maximum Frequency Check 35
Time Scale Accuracy (TSA) 42
Performance Test Record 45
4 Troubleshooting
To troubleshoot the oscilloscope 53
Primary Trouble Isolation 54
Power Supply Trouble Isolation 57
Under-Voltage Fault 60
Over-Temperature Fault 65
Over-Voltage Fault 68
Display Trouble Isolation 71
To check the backlight inverter voltages 73
To check the display board video signals 74
Front Panel Display Trouble Isolation 75
Front Panel Trouble Isolation 77
Motherboard Verification 78
To setup the BIOS 79
Acquisition/Backplane Assembly Trouble Isolation - Scope Self Tests 80
AutoProbe Board Trouble Isolation 83
To check the keyboard; Trouble Isolation Procedure 84
To check the LEDs 85
Software Revisions 86
To check probe power outputs 87
5 Replacing Assemblies
To return the oscilloscope to Agilent Technologies for service 91
To remove and replace the cover, top plate, and bottom plate 92

Contents
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To remove and replace the front panel bezel and front panel circuit assembly 97
To remove and replace the on/off board 101
To remove and replace the backlight inverter board 103
To remove and replace the touch screen, the front deck, and the controller assembly 104
To remove and replace the motherboard 107
To remove and replace the acquisition boards/backplane assembly 108
To remove the backplane assembly from the acquisition assemblies 112
To set the calibration factors after replacing the acquisition board 113
To remove and replace the hard disk drive and the hard drive control board 115
Cable removal (for replacing the motherboard) 117
To remove and replace the power supply 122
To remove and replace the fans 123
To remove and replace the power cord 124
To remove and replace the USB or GPIB port 125
6 Replaceable Parts
Ordering Replaceable Parts 128
Exploded Views 129
Replaceable Parts List 133
7 Theory of Operation
Block-Level Theory 139

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Instruments covered by this service guide 8
Accessories supplied 10
Specifications and Characteristics 10
Environmental Conditions 11
Measurement Category 11
Oscilloscope Dimensions 12
General Information

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Instruments covered by this service guide
Oscilloscopes manufactured after the date this manual was released may be different from those
described in this manual. The release date of this manual is shown on the title page. This manual
will be revised when necessary.
If you have an oscilloscope that was manufactured after the release of this manual, please check
the Agilent Technologies website at www.agilent.com to see whether a newer version of this
manual is available.
The following 90000 A-Series oscilloscopes are covered in this guide.
Table 1 -1 Oscilloscopes Covered by this Service Guide
The oscilloscope model can be identified by the product number on the front or rear panel.
Model Bandwidth
DSO/DSA91304A 13 GHz bandwidth, 40 GSa/s
DSO/DSA91204A 12 GHz bandwidth, 40 GSa/s
DSO/DSA90804A 8 GHz bandwidth, 40 GSa/s
DSO/DSA90604A 6 GHz bandwidth, 20 GSa/s
DSO/DSA90404A 4 GHz bandwidth, 20 GSa/s
DSO/DSA90254A 2.5 GHz bandwidth, 20 GSa/s

Chapter 1: General Information
Performance-Enhanced Versus Standard Models
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Performance-Enhanced Versus Standard Models
In the fall of 2009, Agilent started shipping performance-enhanced models of the 90000 A-Series
oscilloscope. This service guide covers both the standard and performance-enhanced versions
of the 90000 A-Series scopes. Any differences between the two versions are noted.
To tell whether the oscilloscope you have is a standard one or a performance-enhanced version,
check the front panel label. The performance-enhanced models have the works “Performance
Enhanced” on the label.

Chapter 1: General Information
Accessories supplied
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Accessories supplied
The following accessories are supplied.
•Mouse
•Stylus
•Keyboard
• Accessory Pouch
• Front panel Cover
• Calibration Cable (not available or required for the DSO90254A)
• Precision 3.5 mm Adapters (qty 2)(not available or required for the DSO90254A)
• Probe De-skew and Performance Verification Kit, Agilent E2655B
• Power Cord (see parts list in chapter 6 for country-dependent part numbers)
• User's Quick Start Guide
Specifications and Characteristics
The following table contains a partial list of specifications and characteristics for the Agilent
Infiniium A-Series oscilloscopes. For a full list of specifications and characteristics, refer to the
data sheets at www.agilent.com/find/90000.
Specifications that are pertinent to each test are given in the "Testing Performance" chapter.
Specifications are valid after a 30-minute warm-up period, and within
± 5 ° C from the
temperature at which the last self-calibration was performed.
Environment Indoor use only.
Ambient
temperature
Operating 5 ° C to +40 ° C; non-operating –40 ° C to +65 ° C
Humidity Operating: up to 95% relative humidity (non-condensing) at +40
° C
Non-operating: up to 90% relative humidity at +65 °C
Altitude Maximum operating altitude: 4,000 m (12,000 ft)
Installation Category Installation category: 2.
Power Requirements 100-240 V, 47-63 Hz; 800 W max for 4-channel models.
100-240 V, 50 Hz;100-208 V, 50/60 Hz; 800 W max for 8-channel models.
Voltage Fluctuations Note that the mains supply voltage fluctuations are not to exceed +/-10% of the
nominal supply voltage.