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SERVICE MANUAL

Multiple Input
Electronic Load
Mainframes
Agilent 6050A and 6051A

Part No. 06050-90003

Service Manual
For instruments with Serial Numbers:

Agilent 6050A US37140101 and Above
Agilent 6051A US37140101 and Above

For instruments with higher Serial Numbers,
a change page may be included.

For instruments with lower Serial Numbers,
refer to Appendix A.

Microfiche Part No. 06050-90004 Edition 1 Printed: November, 1989
Edition 2 Printed: January, 1992
Edition 3 Printed: November, 1999
CERTIFICATION
Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory. Agilent
Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of
Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of other International
Standards Organization members.

WARRANTY
This Agilent Technologies hardware product is warranted against defects in material and workmanship for a period of three
years from date of delivery. Agilent Technologies software and firmware products, which are designated by Agilent
Technologies for use with a hardware product and when properly installed on that hardware product, are warranted not to
fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date
of delivery. During the warranty period Agilent Technologies will, at its option, either repair or replace products which
prove to be defective. Agilent Technologies does not warrant that the operation of the software, firmware, or hardware shall
be uninterrupted or error free.

For warranty service, with the exception of warranty options, this product must be returned to a service facility designated
by Agilent Technologies. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products returned
to Agilent Technologies for warranty service. Except for products returned to Customer from another country, Agilent
Technologies shall pay for return of products to Customer.

Warranty services outside the country of initial purchase are included in Agilent Technologies' product price, only if
Customer pays Agilent Technologies international prices (defined as destination local currency price, or U.S. or Geneva
Export price).

If Agilent Technologies is unable, within a reasonable time to repair or replace any product to condition as warranted, the
Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent Technologies.

LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer,
Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental
specifications for the product, or improper site preparation and maintenance. NO OTHER WARRANTY IS EXPRESSED
OR IMPLIED. AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES. AGILENT
TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

ASSISTANCE
The above statements apply only to the standard product warranty. Warranty options, extended support contracts, product
maintenance agreements and customer assistance agreements are also available. Contact your nearest Agilent
Technologies Sales and Service office for further information on Agilent Technologies' full line of Support Programs.
SAFETY SUMMARY
The following general safety precautions must be observed during all phases of operation, service and repair of this
instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety
standards of design, manufacture, and intended use of the instrument. Agilent Technologies assumes no liability for the
customer's failure to comply with these requirements.

BEFORE APPLYING POWER.
Verify that the instrument is set to match the available line voltage.

GROUND THE INSTRUMENT.
This product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize shock hazard, the instrument chassis
and cabinet must be connected to an electrical ground. The instrument must be connected to the ac power supply mains through a three-
conductor power cable, with the third wire firmly connected to an electrical ground (safety ground) at the power outlet. Any interruption
of the protective (grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could
result in personal injury. If the instrument is to be energized via an external autotransformer for voltage reduction, be certain that the
autotransformer common terminal is connected to the neutral (earth pole) of the ac power lines (supply mains). This instrument is
equipped with a line filter to reduce electromagnetic interference (EMI), and must be connected to a properly grounded receptacle to
minimize EMI.

FUSES.
Fuses are contained inside the unit, and are not user-replaceable. Only trained service personnel should replace blown fuses, and only
after identifying and correcting the problem which caused the fuse(s) to blow.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.
Do not operate the instrument in the presence of flammable gases or fumes.

KEEP AWAY FROM LIVE CIRCUITS.
Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by qualified
service personnel. Do not replace components with power cable connected. Under certain conditions, dangerous voltages may exist even
with the power cable removed. To avoid injuries, always disconnect power, discharge circuits and remove external voltage sources before
touching components.

DO NOT SERVICE OR ADJUST ALONE.
Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present.

DO NOT EXCEED INPUT RATINGS.
Operation at line voltages or frequencies in excess of those stated on the data plate may cause leakage currents in excess of 3.5 mA peak.

SAFETY SYMBOLS.

Instruction manual symbol: the product will be marked with this symbol when it is necessary for the user to refer to the
instruction manual (refer to Table of Contents) .

Indicates hazardous voltages.

Indicate earth (ground) terminal.

The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly
performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the
indicated conditions are fully understood and met.

The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not correctly
performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed
beyond a CAUTION sign until the indicated conditions are fully understood and met.
DO NOT CIRCUMVENT SAFETY DEVICES.
AC mains power exists on exposed terminals in various locations in the mainframe and on the load modules. To protect the user against
the danger of electric shock, the unit is equipped with a safety interlock that removes as mains power when the top cover is removed. Do
not attempt to defeat the function of the safety interlock.

DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.
Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the
instrument. Return the instrument to an Agilent Technologies Sales and Service Office for service and repair to ensure that safety features
are maintained.

Instruments which appear damaged or defective should be made inoperative and secured against unintended operation until they can be
repaired by qualified service personnel.
Table Of Contents

Introduction ............................................................................................................................................................................ 7
Scope .................................................................................................................................................................................... 7
Related Documents ............................................................................................................................................................... 7
Firmware Revisions .............................................................................................................................................................. 7
Manual Revisions.................................................................................................................................................................. 7
Safety Considerations ........................................................................................................................................................... 8
Disassembly Procedures ......................................................................................................................................................... 9
Introduction........................................................................................................................................................................... 9
Fans....................................................................................................................................................................................... 9
Front Panel............................................................................................................................................................................ 9
GPIB Board ........................................................................................................................................................................ 10
Keypad................................................................................................................................................................................ 10
LCD Display and Window.................................................................................................................................................. 10
Line Switch ......................................................................................................................................................................... 11
Modules .............................................................................................................................................................................. 11
Power Transistors (located on modules) ............................................................................................................................. 11
Transformer (on mainframe)............................................................................................................................................... 12
Troubleshooting .................................................................................................................................................................... 13
Introduction......................................................................................................................................................................... 13
Test Equipment Required ................................................................................................................................................... 13
Electrostatic Discharge (ESD) Protection........................................................................................................................... 13
Overall Troubleshooting Procedures .................................................................................................................................. 15
Selftest Sequence and Error Messages................................................................................................................................ 15
Primary Circuits .............................................................................................................................................................. 19
Secondary Circuits .......................................................................................................................................................... 19
Test Points ...................................................................................................................................................................... 21
Signature Analysis .............................................................................................................................................................. 24
Firmware Revisions ........................................................................................................................................................ 24
Test Header Jumper Positions......................................................................................................................................... 25
Test Setup for Signature Analysis................................................................................................................................... 25
GPIB Board Troubleshooting Setup ............................................................................................................................... 26
Load Module Troubleshooting Setup ............................................................................................................................. 26
DAC Circuits Troubleshooting (Figure 3-3) ....................................................................................................................... 39
Slew Circuit Troubleshooting (Figure 3-4) ......................................................................................................................... 41
CC/CV CONTROL CIRCUIT TROUBLESHOOTING (Figure 3-5) ................................................................................ 42
Input Power Stages Troubleshooting (Figure 3-6) .............................................................................................................. 47
Transient Generator Troubleshooting (Figure 3-7)............................................................................................................. 47
General Troubleshooting ................................................................................................................................................ 47
Transient Generator Frequency....................................................................................................................................... 47
Toggle or Pulse Modes ................................................................................................................................................... 50
Trigger Circuit Troubleshooting (Figure 3-8)..................................................................................................................... 51
AC Line Triggers ............................................................................................................................................................ 51
Internal Timer Triggers................................................................................................................................................... 51
Level Triggers (*TRG and TRIG command).................................................................................................................. 52
Group Enable Trigger (GET function)............................................................................................................................ 52
External Triggers ............................................................................................................................................................ 52
Overcurrent Circuit Troubleshooting (Figure 3-9).............................................................................................................. 54
Overpower Circuit Troubleshooting (Figure 3-10) ............................................................................................................. 55
Fan Speed Control Troubleshooting (Figure 3-11) ............................................................................................................. 56

5
Post Repair Calibration....................................................................................................................................................... 59
EEPROM Initialization................................................................................................................................................... 59
Principles Of Operation ....................................................................................................................................................... 61
Introduction ........................................................................................................................................................................ 61
Bias Supplies ...................................................................................................................................................................... 61
GPIB Board Circuits........................................................................................................................................................... 61
Control Board Circuits........................................................................................................................................................ 62
Power Board Circuits.......................................................................................................................................................... 66
Module/Mainframe Communication................................................................................................................................... 66
Replaceable Parts ................................................................................................................................................................. 69
Introduction ........................................................................................................................................................................ 69
How To Order Parts............................................................................................................................................................ 69
Diagrams ............................................................................................................................................................................... 80
Introduction ........................................................................................................................................................................ 80
Test Point and Component Locations ................................................................................................................................. 80
Schematic Diagram............................................................................................................................................................. 80
Signal Descriptions......................................................................................................................................................... 80
Manual Backdating .............................................................................................................................................................. 85

"A" Load Modules Troubleshooting .................................................................................................................................. 93
Earlier "A" Load Modules.................................................................................................................................................. 93
Later "A" Modules.............................................................................................................................................................. 93
DAC Circuits Troubleshooting (Figure 3-3)..................................................................................................................... 100
Slew Circuit Troubleshooting (Figure 3-4)....................................................................................................................... 101
CC/CV Control Circuit Troubleshooting (Figure 3-5)...................................................................................................... 102
Input Power Stages Troubleshooting (Figure 3-6)........................................................................................................... 105
Transient Generator Troubleshooting (Figure 3-7)........................................................................................................... 106
Overcurrent Circuit Troubleshooting (Figure 3-9) ........................................................................................................... 108
Overpower Circuit Troubleshooting (Figure 3-10)........................................................................................................... 109
Index .................................................................................................................................................................................... 111

6
1
Introduction

Scope

This manual contains information for troubleshooting and repairing the Electronic Load mainframe and modules to the
component level. Replaceable-parts lists and circuit diagrams for the mainframe are also provided. Verification procedures
are included to aid in determining the performance level either before or after repair. Calibration procedures and
specifications for the Electronic Load are included in the Operating Manual. Replaceable-parts lists, circuit diagrams, and
verification procedures for the load modules are given in the individual module service manuals, which should be
used with this manual