LeCroy LC564DL User manual

LC684DL-SM-E ECO 1001

LeCroy Color Digital Oscilloscopes

LC564DL

Service Manual

Version B- September 2002

LC564DL 1GHz Oscilloscope

LeCroy Corporate Headquarters

700 Chestnut Ridge Road

Chestnut Ridge, NY 10977-6499

USA

Tel : (845) 425-2000

http://www.lecroy.com

LeCroy European Service

LeCroy SA

2, Chemin Pre-de-la Fontaine

CH-1217 Meyrin 1 Geneva

Switzerland

Tel : 41 (22) 719-21-11

LeCroy Japan Service

LeCroy Japan Corporation

Sasazuka Center Bldg – 6th floor,

1-6, 2-Chome, Sasazuka, Shibuya-ku

Tokyo Japan 151-0073

Tel. (81) 3 3376 9400

Specifications subject to change.

Table of Contents i

Read this first

1. Warranty and Product Support 1-1

1.1 Warranty 1-1

1.2 Product Assistance 1-1

1.3 Maintenance Agreements 1-1

1.4 Staying Up to Date 1-2

1.5 Service and Repair 1-2

1.6 How to Return a Product 1-2

1.7 What Comes with your Scope 1-2

General Information 2-1

2.1 Product Assistance 2-1

2.2 Installation for Safe and Efficient Operation 2-1

Operating Environment 2-1

Safety Symbols 2-1

Power Requirements 2-3

Cleaning and Maintenance 2-3

Power On 2-3

Specifications

3.1 Signal Capture 3-1

3.2 Acquisition Modes 3-2

3.3 Timebase System 3-2

3.4 Triggering System 3-2

3.5 Smart trigger Types 3-3

3.6 Autosetup 3-3

3.7 Probes 3-3

3.8 Display 3-4

3.9 Rapid Signal Processing 3-4

3.10 Waveform Processing 3-5

3.11 Interfacing 3-6

3.12 General 3-6

3.13 CE Approval 3-6

Theory of Operation

4.1 Processor Board 4-1

MPC603e Processor 4-1

Power Supplies 4-1

32 bit Peripherals 4-1

Figure 4-1: Processor Block Diagram 4-2

DRAM 4-3

Normal Access Timing 4-3

Burst Access Timing 4-3

Refresh Timing 4-3

ii Table of Contents

Theory of Operation

Memory Mapping 4-4

VGA 4-4

9601-2 Board: VGA proper termination 4-4

Bus Sizer 4-5

16 and 8-bit peripherals 4-5

PCMCIA Interface 4-5

Flash Prom 4-6

NVRAM 4-6

Interrupt Controller 4-6

Floppy Controller 4-6

Centronics 4-6

Small Peripheral Interface 4-7

Serial Interface For On Board Peripherals 4-7

RTC 4-7

Front Panel 4-7

Watchdog and Reset Generation 4-8

Bus Error Generation 4-8

I/O Structure & GAL's Installed 4-8

Figure 4-2: Peripheral Decoding and Data Bus Size 4-9

4.2 900079 Main Acquisition Board 4-10

4.2.1 Introduction 4-10

4.2.2 Front End 4-10

Front End Power off State 4-11

Figure 4-3: Front End Power off State 4-11

50Ohm Input Direct Path 4-12

Figure 4-4: 50Ohm Input Direct Path 4-12

50Ohm Input Divide by 10 Path 4-12

Figure 4-5: 50Ohm Input Divide by 10 Path 4-12

1 MOhm Direct Path 4-13

Figure 4-6: 1 MOhm Direct Path 4-13

I Mohm Input Divide by 10 AC Coupled Path 4-13

Figure 4-7: 1 Mohm Divide by 10 AC Coupled 4-13

Front end analog controls 4-13

4.2.3 Main Acquisition Board Block Diagram 4-14

Figure 4-8: Front End, Trigger, Sample & Hold, ADC 4-14

4.2.4 One, Two and Four Channel Mode 4-15

Four Channel Mode 4-15

Figure 4-9 Four Channel Mode Signal Routing 4-15

Two Channel Mode 4-15

Figure 4-10 Two Channel Mode Signal Routing 4-15

4.2.4 Control & Transfer Block Diagram 4-16

Figure 4-11: Processor Control, Min/Max, Buffer Memory 4-16

4.2.5 Trigger 4-17

Analog Controls 4-17

TV Trigger 4-17

4.2.6 Analog to Digital Converter 4-17

Introduction 4-17

Theory of Operation

4.2.7 Time Base 4-18

Introduction 4-18

Figure 4-12: Time Base Block Diagram 4-18

4.3 F9301-4 GPIB & RS232 Interface 4-19

4.3.1 GPIB/RS232 Interface Block Diagram 4-19

Figure 4-13: GPIB/RS232 Interface Block Diagram 4-19

4.3.2 RS232 Serial Interface 4-19

4.3.3 GPIB Interface 4-19

4.4 Front Panel 4-20

4.5 F9300-7 Printer Controller 4-20

4.6 PS9611 Power Supply 4-20

4.6.1 Specifications 4-20

4.6.2 Power Supply Block Diagram 4-22

Performance Verification

5 Performance Verification Procedures 5-1

5.1 Introduction 5-1

5.1.1 List of Tested Characteristics 5-1

5.1.2 Calibration Cycle 5-1

5.2 Test Equipment Required 5-2

5.2.1 Test Records 5-2

5.3 Turn On 5-2

5.4 Input Impedance 5-3

5.4.1 Channel Input Impedance 5-3

5.4.1.a DC 1MΩ5-3

5.4.1.b AC 1MΩ5-4

5.4.1.c DC 50Ω5-5

5.4.2 External Trigger Input Impedance 5-6

5.4.2.a DC 1MΩ5-6

5.4.2.b DC 50Ω5-7

5.4.3 Ground 5-8

5.5 Leakage Current 5-9

5.5.1 Channel Leakage Current 5-9

5.5.1.a DC 1MΩ5-9

5.5.1.b DC 50Ω5-10

5.5.2 External Trigger Leakage Current 5-10

5.5.2.a DC 50Ω5-10

5.5.2.b DC 50ΩEXT/5 5-11

5.6 Average Noise Level 5-11

5.6.1 Peak to Peak Noise 5-11

5.6.1.a DC 1MΩ5-11

5.6.1.b AC 1MΩ5-14

5.6.1.c DC 50Ω5-15

5.6.1.d DC 50Ω, 2 Channel Mode 5-16

Table of Contents iii

iv Table of Contents

Performance Verification

5.6.2 RMS Noise 5-18

5.6.2.a DC 1MΩ5-18

5.6.2.b AC 1MΩ5-19

5.6.2.c DC 50Ω5-20

5.6.2.d DC 50Ω, 2 Channel Mode 5-21

5.6.3 Ground Line Test 5-23

5.6.3.a DC 1MΩ5-23

5.6.3.b DC 50Ω5-26

5.6.3.c DC 50Ω, 2 Channel Mode 5-27

5.7 DC Accuracy 5-28

5.7.1 Positive DC Accuracy 5-28

5.7.1.a DC 50Ω5-28

5.7.1.b DC 1MΩ5-32

5.7.2 Negative DC Accuracy 5-35

5.7.2.a DC 50Ω5-35

5.7.2.b DC 1MΩ5-36

5.8 Offset Accuracy 5-37

5.8.1 Positive Offset Accuracy 5-37

5.8.1.a DC 50Ω5-37

5.8.1.b DC 1MΩ5-40

5.8.2 Negative Offset Accuracy 5-41

5.8.2.a DC 50Ω5-41

5.8.2.b DC 1MΩ5-42

5.9 Bandwidth 5-44

5.9.1 Description 5-44

5.9.1.a DC 50Ω5-44

5.9.1.b DC 50Ωwith Bandwidth Limiter On 5-48

5.9.2 DC 1MΩ5-51

5.10 Trigger Level 5-54

5.10.1 Description 5-54

5.10.2 Channel Trigger at 0 Division Threshold 5-54

5.10.3 Channel Trigger at +3 Divisions Threshold 5-57

5.10.4 Channel Trigger at −3 Divisions Threshold 5-58

5.10.5 External Trigger at 0 Division Threshold 5-60

5.10.6 External Trigger at +3 Divisions Threshold 5-62

5.10.7 External Trigger at −3 Divisions Threshold 5-63

5.10.8 External/5 Trigger at 0 Division Threshold 5-64

5.10.9 External/5 Trigger at +3 Divisions Threshold 5-66

5.10.10 External/5 Trigger at −3 Divisions Threshold 5-67

5.11 Smart Trigger 5-68

5.11.1 Trigger on Pulse Width 10 nsec 5-68

5.11.1.a Pulse Width < 10 nsec 5-68

5.11.1.b Pulse Width > 10 nsec 5-68

5.11.2 Trigger on Pulse Width 100 nsec 5-70

Performance Verification

5.11.2.a Pulse Width < 100 nsec 5-70

5.11.2.b Pulse Width > 100 nsec 5-70

5.12 Time Base Accuracy 5-71

5.12.1 Description 5-71

5.12.2 500 MHz Clock Verification Procedure 5-71

5.13 Overshoot and Rise time 5-73

5.13.a DC 50Ω5-73

5.13.b DC 1MΩ5-75

Test Record

Table 1 LC684D Performance Certificate 1 of 12

Table 2 Impedance Test Record 2 of 12

Table 3 Leakage Voltage Test Record 2 of 12

Table 4 Peak to Peak Noise Test Record 3 of 12

Table 5 RMS Noise Test Record 3 of 12

Table 6 DC 1MΩGround Line Test Record 4 of 12

Table 7 DC 50ΩGround Line Test Record 4 of 12

Table 8 DC 50ΩPositive DC Accuracy Test Record 5 of 12

Table 9 DC 1MΩPositive DC Accuracy Test Record 6 of 12

Table 10 DC 50ΩNegative DC Accuracy Test Record 7 of 12

Table 11 DC 1MΩNegative DC Accuracy Test Record 7 of 12

Table 12 Positive Offset Test Record 7 of 12

Table 13 Negative Offset Test Record 8 of 12

Table 14 DC 50Ω, 50 mv/div. Bandwidth Test Record 8 of 12

Table 15 DC 50Ω, 100 mv/div. Bandwidth Test Record 9 of 12

Table 16 DC 50Ω, Bandwidth Limiter Test Record 9 of 12

Table 17 DC 1MΩ, Bandwidth Test Record 10 of 12

Table 18 Channel DC Trigger Test Record 10 of 12

Table 19 External & Ext/5 DC Trigger Test Record 11 of 12

Table 20 Smart Trigger Test Record 12 of 12

Table 21 Time Base Test Record 12 of 12

Table 22 Rise time and Overshoot Test Record 12 of 12

Table of Contents v

vi Table of Contents

Maintenance

6.1 Introduction 6-1

6.1.1 Safety Precautions 6-1

6.1.2 Antistatic Precautions 6-1

6.2 Disassembly and Assembly Procedure 6-2

6.2.1 Disassembly Procedure 6-2

6.2.1.a Removal of the Front Bezel 6-2

6.2.1.b Removal of the Upper Cover Assembly 6-2

6.2.1.c Removal of the Front Frame with Color Monitor 6-3

6.2.1.d Removal of the Processor Board 6-3

6.2.1.e Removal of the Power Supply Assembly 6-3

6.2.1.f Removal of the Upper Shield Assembly 6-4

6.2.1.g Removal of the Rear Panel Assembly 6-4

6.2.1.h Removal of the Main Board Assembly 6-4

6.2.2 Assembly Procedure 6-5

6.3 Software Update Procedure 6-6

6.3.1 Upgrading Firmware 6-6

6.3.1.a Performing the Update from GPIB 6-6

6.3.1.b Performing the Update from RS232 6-7

6.3.1.c Performing the Update from Floppy 6-8

6.3.2 Software Options 6-8

6.3.2.1 Changing Software Option Key 6-9

6.3.2.1.a Scope ID, Scope Serial Number 6-9

6.3.2.1.b Entering Option Key 6-9

6.3.3 Processor Board Exchange Procedure 6-9

6.4 Equipment and Spare Parts Recommended for Service 6-10

6.4.1 Test Equipment Required 6-10

6.4.2 Spare Parts Recommended for Service 6-10

6.5 Calibration Procedures 6-10

6.5.1 Power Supply Calibration Procedure 6-11

6.6 Troubleshooting and Flow Charts 6-12

6.6.1 Introduction 6-12

6.6.2 Line Fuses Replacement 6-12

6.6.3 Initial Troubleshooting Chart 6-12

6.6.4 Fan Problem 6-14

6.6.5 Power Supply Voltages Problem 6-15

6.6.6 Display Problem 6-16

6.6.7 Front Panel Controls Do not Operate 6-17

6.6.8 Remote Control GPIB & RS232 Problem 6-18

6.6.9 Performance Verification Fails 6-19

6.6.10 Floppy Disk Drive Problem 6-20

6.6.11 Graphic Printer Problem 6-21

6.6.12 Centronics Problem 6-22

6.6.13 Hard Disk Drive Problem 6-23

Replaceable Parts

LC684D, LC684DM, LC684DL & LC684DXL 7-1

9615-GP01 Graphic Printer Assembly 7-2

F9300-7 Printer Controller 7-2

F9300-8 Hard Disk Interface 7-4

F9301-4 GPIB & RS232 Interface 7-5

F9601-11-16 Processor with 16 Mbytes Memory 7-5

F9601-11-64 Processor with 64 Mbytes Memory 7-5

S9601-11 Processor Card without DRAM Memory 7-6

F9601-2 Centronics & VGA Interface 7-8

F9601-6 Floppy Disk Drive Assembly 7-9

F9601-8 Main Switch Board 7-9

F9602-1-64 Processor Card 200 Mhz With DRAM 7-9

S9602-1 Processor 200MHz Card Without DRAM 7-9

F9602-9 Universal Fan Control 7-12

F9615-3 Main Acquisition Board 7-12

S9615-3 Main Acquisition Board 7-13

F9615-5 Keyboard Assembly 7-19

LC684-ACC Accessories 7-20

LC684-CKTRIG Option 7-20

LCDFP9615 LCD Display and Front Panel Assembly 7-21

LCLC9615 Lower Cover 7-21

LCXXX-PAK Packaging Material 7-21

M9615 Mechanical Parts 7-22

RP9615 Rear Panel Assembly 7-22

S9615-21 Buffer Board 7-23

S9615-22 Interface Circuit 7-23

S9615-51 Keypad 7-23

S9615-52 Generic Front Panel 7-24

UC9615 Upper Cover Assembly 7-24

US9615 Upper Shield Rod Assembly 7-24

Table of Contents vii

viii Table of Contents

Mechanical Parts

Figure 8-1: LC684D/DM/DL/DXL Cabinet 8-1

Figure 8-2 LC684D/DM/DL/DXL Chassis Assembly 8-2

Cabinet Replaceable Parts 8-3

Chassis Replaceable Parts 8-3

Figure 8-3: Power Supply Installation 8-4

Figure 8-4: LC684D Lower Cover Assembly 8-5

Power Supply Installation Replaceable Parts 8-6

Lower Cover Replaceable Parts 8-6

Figure 8-5: Lower Cover with CKTRIG Option 8-7

Figure 8-6: Lower Cover 8-8

Lower Cover with CKTRIG Option Replaceable Parts 8-9

Lower Cover Replaceable Parts 8-9

Figure 8-7: CKTRIG Option 8-10

Figure 8-8: Rear Panel Assembly 8-11

CKTRIG Option Replaceable Parts 8-12

Rear Panel Replaceable Parts 8-12

Figure 8-9: F9615-3 Main Board Assembly 8-13

Figure 8-10: Main Board Assembly 8-14

F9615-3 Main Board Replaceable Parts 8-15

Figure 8-11: Upper Shield Assembly 8-16

Figure 8-12: Front Frame Assembly 8-17

Upper Shield Replaceable Parts 8-18

Front Frame Replaceable Parts 8-18

Figure 8-13: Keypad Assembly 8-19

Figure 8-14: Fan Assembly 8-20

Keypad Replaceable Parts 8-21

Fan Replaceable Parts 8-21

Figure 8-15: Graphic Printer Assembly 8-22

Figure 8-16: Upper Cover Assembly 8-23

Graphic Printer Replaceable Parts 8-24

Upper Cover Replaceable Parts 8-24

Figure 8-17: Hard Disk Assembly 8-25

Figure 8-18: Centronics & VGA Interface Assembly 8-26

Figure 8-19: Floppy Disk Assembly 8-27

Hard Disk Replaceable Parts 8-28

Centronics & VGA Replaceable Parts 8-28

Floppy Replaceable Parts 8-28

Figure 8-20 LC684D Dimensions 8-29

Figure 8-21: :C684D Packaging 8-30

Table of contents

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