LeCroy WaveSurfer 400 Series

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6.10.9 Timebase Problem

HIS

PROCEDURE

ASSUMES

THAT

THE

SYSTEM

CAPABLE

PASSING

CLEAN

CONTINUOUS

SINEWAVE

EACH

CHANNEL

EPLACE

CQUISITION

OARD

Maintenance 6-59

Main Page

Table of Contents3
Read this First9
Warranty9
Warranty and Product Support9
Product Assistance9
Maintenance Agreements9
Staying up to Date10
Service and Repair10
How to Return a Product10
What Comes with Your Scope10
General Information11
Product Assistance11
Installation for Safe and Efficient Operation11
Operating Environment11
Safety Symbols11
Power Requirements13
Cleaning and Maintenance13
Specifications15
Vertical15
Triggering System15
Standard Triggers15
Optional SMART Triggers16
Documentation and Connectivity16
Measure, Zoom, and Math Tools17
Automatic Setup17
Setup and Waveform Storage17
Outputs17
Environmental and Safety18
Physical Dimensions18
General18
Warranty & Calibration18
Theory of Operation19
System Block Diagram19
Main Board20
Front End21
Analog to Digital Converter23
Trigger24
Time Base27
Calibrator28
Scan DAC28
Main Board Control28
Computer29
Operating System29
Memory29
Interfaces29
Storage Devices29
Video Port29
PCI Card30
PCI Interface30
Local Bus for Acquisition31
Control31
Acquisition Data31
Dallas Onewire Interface31
Audio Amplifire31
Front Panel31
Key Board32
Panel Board32
Encoders32
Touchscreen Interface32
Display and Touchscreen33
Color LCD Module33
Backlight Inverter33
Touch Screen33
LVDS Receiver33
Power Supply34
Input Voltages34
Output Voltages35
Basic Operation35
Pre-Converter35
Main Converter35
House Keeping Power Supply35
5VDIG and 3.3V DC/DC(Daughter Board)35
5VANA and 2.5V DC/DC (Daughter Board)36
And 12V DC/DC (Daughter Board)36
Filter Circuits (Daughter Boards)36
Connector Assignments36
Output Voltage Adjustment Range39
5VSB Standby Supply Rail39
Performance Verification41
Introduction41
List of Tested Characteristics41
Calibration Cycle41
Test Equipment Required42
Test Records42
Turn on42
Input Impedance43
Channel Input Impedance43
External Trigger Input Impedance47
Leakage Current49
Channel Leakage Current49
External Trigger Leakage Current52
Peak-Peak Noise Level54
DC Accuracy56
Positive DC Accuracy56
Negative DC Accuracy59
Offset Accuracy60
Positive Offset Accuracy60
Negative Offset Accuracy62
Bandwidth63
Description63
Trigger Level68
Description68
Channel Trigger at 0 Division Threshold68
Channel Trigger at +2.5 Divisions Threshold71
Time Base Accuracy74
Description74
Clock Verification Procedure74
Introduction87
Safety Precautions87
Anti-Static Precautions87
Software Update Procedure87
Installing New X-Stream DSO Application Software88
Software End User License Agreement89
Installing Device Drivers94
Restoring the Operating System95
Software Options100
Changing Software Option Key100
Board Exchange Procedure101
PCI Board Exchange Procedure101
Hard Drive Replacement Procedure101
Required Items101
Preparation of Host Machine101
Copying Necessary Files to Share Them through Network102
Creating a Network-Ready Startup Disk103
Updating the Hard Disk (through a Network)106
Setup at the First Startup108
Validating the Software110
Initialization of Panel Setup110
BIOS Setting111
Battery Exchange Procedure114
Update BIOS114
Equipment and Spare Parts Recommended for Service115
Test Equipment Required115
Wavesurfer Spare Parts115
Service Menu116
Accessing Service Menu116
Mainframe Tests117
Front Panel Test117
Calibration Procedures119
System Power Supply Calibration Procedure119
Touch Screen Calibration Procedure121
Front/Acq System Adjustments123
Internal Reference Voltage Adjustment123
Front End Adjustment124
TDC Adjustment127
Trigger Delay Adjustment127
Trigger Hysteresis Adjustment128
Event Trigger Delay Adjustment128
Odd Path Adjustment129
Trigger Analog Time Adjustment130
Adjustment of Time Difference between Channels132
Speaker Volume Adjustment133
Troubleshooting and Flow Charts133
Introduction133
Repair Level133
Initial Troubleshooting134
Power Supply Problem136
No Display (Internal or External)137
Internal Display Problem139
Boot up Sequence140
Front Panel Controls or Touch Screen Does Not Operate141
Timebase Problem145
Remote Control Problem146
Vertical Accuracy Problem147
Bandwidth Problem148
Line Trigger Problem149
Mechanical Parts & Removal151
Over All Replaceable Parts151
Over All Block Diagram153
Disassembly Flow Charts154
OUTER Replaceable Parts155
REAR & SIDE Replaceable Parts155
FRONT Panel Assy164
FRONT Bezel Assy164
Spare Parts165

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