Agilent Technologies 6625A Service Manual

CONTENTS
Section I
INTRODUCTION
1-1 SCOPE ……………………………………………………1-1
1-2 SAFETY CONSIDERATIONS…………………………..1-1
1-3 INSTRUMENT AND MANUAL
IDENTIFICATION……………………………………….1-1
1-4 FIRMWARE REVISIONS ……………………………….1-1
Section II
PRINCIPLES OF OPERATION
2-1 INTRODUCTION ………………………………………..2-1
2-2 OVERALL BLOCK DIAGRAM DESCRIPTION
(Figure 2-1) ………………………………………………..2-1
2-3 AC Input Circuits ………………………………………..2-1
2-4 GPIB Board .……………………………………………... 2-1
2-5 Front Panel ……………………………………………….2-1
2-6 Output Boards …………………………………………2-1
2-7 GPIB BOARD (Figure 2-3) ……………………………... 2-3
2-8 GPIB Interface …………………………………………... 2-3
2-9 System MicroComputer…………………………………2-4
2-16 Output Boards Interface ………………………………...2-4
2-20 Front Panel Interface …………………………………...2-5
2-23 Bias Supply and Start Up ……………………………….2-5
2-24 OUTPUT BOARD ……………………………………… 2-7
2-25 Secondary Interface Circuits
(Figure 2-4) ……………………………………………… 2-7
2-37 Power mesh and Control Circuits
(Figure 2-5) …………………………………………… 2-10
Section III
VERIFICATION
3-1 INTRODUCTION ………………………………………..3-1
3-2 TEST EQUIPMENT REQUIRED ………………………3-1
3-3 OPERATION VERIFICATION TESTS ………………. 3-1
3-4 PERFORMANCE TESTS ………………………………..3-1
3-5 Introduction………………………………………………3-1
3-6 Measurement Techniques ………………………………3-1
3-10 Constant Voltage (CV) Tests ……………………………3-4
3-19 Constant Current (CC) Tests…………………………..3-10
3-27 EXTENDTED TESTS …………………………………...3-13
3-28 Output Drift Tests ……………………………………...3-13
Section IV
TROUBLESHOOTING
4-1 INTRODUCTION ………………………………………..4-1
4-2 ELECTROSTATIC PROTECTION ……………………..4-1
4-3 REMOVAL AND REPLACEMENT …………………...4-2
4-4 Top Cover Removal …………………………………….4-2
4-5 Gaining Access to Assemblies in the Supply …………4-2
4-6 GPIB Board Removal ..………………………………….4-2
4-8 DUSTCOVERS …………………………………………..4-4
4-9 Replacing the Power Module U338 ……………………4-4
4-10 Front Panel Removal …………………………………….4-4
4-11 Chassis Mounted Components ………………………...4-5
4-12 TEST EQUIPMENT REQUIRED ……………………….4-5
4-13 FUSE REPLACEMENT………………………………….4-5
4-14 INITIAL TROUBLESHOOTING AND BOARD
ISOLATION PROCEDURES ..…………………………4-8
4-15 Power-On Self Test ………………………………………4-8
4-16 Connector P201 Jumper Positions ……………………...4-9
4-17 ERROR Codes and Messages…………………………...4-9
4-18 GPIB BOARD AND FRONT PANEL
TROUBLESHOOTING PROCEDURES ……………...4-13
4-19 Test Setup ……………………………………………….4-13
4-20 Post Repair Calibration………………………………...4-13
4-21 Setting the Model Number
(MODEL Command) …………………………………...4-13
4-22 Signature Analysis Testing …………………………4-14
4-23 Test Setup for S.A. ……………………………………...4-14
4-24 Firmware Revisions (ROM? Command)……………..4-14
4-25 OUTPUT BOARD TROUBLESHOOTING
PROCEDURES ………………………………………….4-30
4-26 Test Setup ……………………………………………….4-30
4-27 Post Repair Calibration ………………………………..4-30
4-28 Self Exercise Routine on the Output Board ………….4-30
4-29 Troubleshooting Analog Multiplexer U323 and
Readback Using VMUX? Command …………………4-49
4-30 Understanding and Troubleshooting the Signal
Processor (U327)………………………………………...4-50
4-33 Power Module Signals …………………………………4-54
4-34 Miscellaneous Trouble Symptoms and Remedies ….4-54
Section V
REPLACEABLE PARTS
5-1 INTRODUCTION ………………………………………..5-1
5-2 HOW TO ORDER PARTS ………………………………5-1
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Agilent Technologies 6625A Specifications

General

Brand	Agilent Technologies
Model	6625A
Category	Power Supply
Language	English