Agilent Technologies 66000A User manual

SERVICE GUIDE
for Agilent 66000A
MPS Mainframe
Serial Numbers:
Agilent Model 66000A: 3522A01561 thru 03295
US35220101 and up
Agilent Part No. 66000-90003 Printed in USA
Microfiche Part No. 66000-90004 Update: June, 2000

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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, INC. 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.

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SAFETY SUMMARY
The following general safety precautions must be observed during all phases of operation of this mainframe.
Failure to comply with these precautions or with specific warnings elsewhere in this guide violates safety
standards of design, manufacture, and intended use of the mainframe. Agilent Technologies assumes no liability
for the user's failure to comply with these requirements.
GROUND THE MAINFRAME.
This product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize shock hazard, the
mainframe must be connected to an electrical ground. The mainframe 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.
DO NOT EXCEED INPUT RATINGS.
This mainframe is equipped with a power line filter to reduce electromagnetic interference and must be connected to a
properly grounded receptacle to minimize electric shock hazard. Operation at line voltages or frequencies in excess of those
stated on the line rating label may cause leakage currents in excess of 5.0 mA peak.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.
Do not operate the mainframe in the presence of flammable gases or fumes.
BEFORE APPLYING POWER.
Verify that the power cord is correctly connected to the mainframe.
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.
Mainframes that appear damaged or defective should be made inoperative and secured against unintended operation until
they can be repaired by qualified service personnel.
.

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Printing History
The current edition of this guide is indicated below. Reprints of this guide containing minor corrections and updates may
have the same printing date. New editions are identified by a new printing date and, in some cases, by a new part number.
A new edition incorporates all new or corrected material since the previous edition. Changes to the guide occurring
between editions are covered by change sheets shipped with this guide. Also, if the serial number prefix of your mainframe
is higher than those listed on the title page of this guide, then it may or may not include a change sheet. That is because
even though the higher serial prefix indicates a design change, that change may not affect the content of the guide.
Edition 1 . . . November, 1992
Updated June, 2000
Copyright 1992, 2000 Agilent Technologies, Inc.
This document contains proprietary information protected by copyright. All rights are reserved. No part of this document
may be photocopied, reproduced, or translated into another language without prior consent of Agilent Technologies. The
information contained in this document is subject to change without notice.

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Table of Contents
Overview..................................................................................................................................................................................7
About This Manual...............................................................................................................................................................7
Related Documents...........................................................................................................................................................8
Revisions and Updates..........................................................................................................................................................8
Manual..............................................................................................................................................................................8
Firmware...........................................................................................................................................................................8
Safety Considerations ...........................................................................................................................................................8
Electrostatic Discharge .........................................................................................................................................................9
Service Tools and Equipment...............................................................................................................................................9
Verification............................................................................................................................................................................11
Preliminary Checkout .........................................................................................................................................................11
POWER-ON Checkout.......................................................................................................................................................12
Selftest Sequence............................................................................................................................................................12
In Case of Trouble..........................................................................................................................................................12
Output Checkout.................................................................................................................................................................14
In Case of Trouble..........................................................................................................................................................14
Problem Not Identified .......................................................................................................................................................14
Disassembly ...........................................................................................................................................................................15
Disassembly Procedures .....................................................................................................................................................15
Removing the Modules and Module Connectors............................................................................................................15
Removing the Cover .......................................................................................................................................................15
Removing the Front Frame .............................................................................................................................................15
Removing the Front Bezels and Keyboard Plug .............................................................................................................16
Removing the Rear Subchassis.......................................................................................................................................16
Removing the Pc Boards.................................................................................................................................................16
Reassembly Procedures ......................................................................................................................................................17
Installing the Pc Boards..................................................................................................................................................17
Assembling the Rear Subchassis.....................................................................................................................................18
Assembling the Keyboard Plug and Front Bezels...........................................................................................................18
Assembling the Front Frame...........................................................................................................................................18
Assembling the Cover.....................................................................................................................................................19
Troubleshooting....................................................................................................................................................................21
Troubleshooting Sequence..................................................................................................................................................21
Accessing the Flowcharts....................................................................................................................................................21
If You Experienced a Selftest Failure.............................................................................................................................21
If You Experienced Other Problems With the Mainframe..............................................................................................22
Troubleshooting Flowcharts ...............................................................................................................................................22
Replacement Parts................................................................................................................................................................33
Diagrams................................................................................................................................................................................39
Test Point and Component Location Diagram....................................................................................................................39
Main Board Schematics......................................................................................................................................................39
Sheet 1 Circuit Functions................................................................................................................................................39

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Sheet 2 Circuit Functions................................................................................................................................................39
Sheet 3 Circuit Functions................................................................................................................................................40
Backplane Board Schematic...............................................................................................................................................40
Exploded View Diagram.....................................................................................................................................................40
Schematic Notes .................................................................................................................................................................41
Manual Backdating ..............................................................................................................................................................49
Index ......................................................................................................................................................................................51

Overview 7
1
Overview
About This Manual
This manual is a complete guide for servicing the Agilent 66000A Modular Power System (MPS) Mainframe.
Troubleshooting information for the Agilent 661xxA MPS Power Modules is provided in the module service manual (see
"Related Documents"), which should be used with this manual.
Note Troubleshooting the Agilent 66000A MPS Mainframe requires the use of one working Agilent 661xxA
MPS Power Module.
This manual is organized into the following major sections:
•Overview discusses safety and equipment considerations to be aware of when troubleshooting. It also lists the tools and
equipment required for troubleshooting.
•Verification consists of a series of tests that are used to help isolate a fault. It includes the selftest sequence that runs
automatically at power-on and verifies the integrity of the microprocessor, the GPIB and serial interfaces, and the
memory.
•Disassembly procedures are used to disassemble the instrument for repair.
•Troubleshooting procedures systematically verify selected circuits to isolate the cause of a problem. Suggestions for
remedying the problem are also provided. Troubleshooting procedures are provided for the following circuits:
§Bias Supplies.
§Microprocessor.
§RAM and ROM Memory.
§GPIB and Serial Interfaces.
§Discrete Fault Indicator/Remote Inhibit (DFI/RI) Circuitry.
§Trigger Circuits.
§Power Module Communication.
§Keyboard Accessory Port.
•Replacement Parts lists part numbers for electrical components and miscellaneous chassis parts.
•Schematics and component location diagrams are provided as an aid in troubleshooting and repair.

Overview
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Related Documents
The following documents are related to this manual:
Manual
Part Number Description
Agilent 66000A MPS Mainframe Installation
Guide
66000-90001
Provides product specifications, installation, and connection information.
Agilent Series 661xxA MPS Power Modules
User's Guide
5959-3386
Describes the operation of the MPS Power Modules.
Agilent Series 661xxA MPS Power Modules
Programming Guide
5959-3362
Describes SCPI programming commands, status reporting.
Agilent Series 661xxA MPS Power Modules
Service Manual
5959-3364
Provides replaceable-parts lists, circuit diagrams, and verification procedures for the
Agilent Series 661xxA MPS Power Modules.
Revisions and Updates
Manual
Agilent Technologies instruments are identified by a two-part, ten-character serial number, such as 3138A-00101. The first
five characters (e.g. 3138A) are the serial prefix, which is the same for all identically made instruments. The last five digits
(e.g. 00101) are a unique serial number assigned to each instrument. If a significant design change is made, the prefix
changes but the last five numbers continue in sequence.
This manual applies to Agilent 66000A MPS Mainframes with the same serial prefixes and serial numbers equal to or
higher than the ones shown on the title page. If the prefix number on your mainframe is higher than the one on the title page,
then the mainframe was made after publication of the manual and may have hardware and/or firmware differences not
covered in the manual. If there are such differences, they are documented in one or more "Manual Changes" sheets sent with
the manual.
Firmware
This manual applies to mainframes that run on software revisions A.00.01 through A.00.05. The mainframe ROM chip has a
label that specifies the firmware revision.
Safety Considerations
The Agilent 66000A MPS Mainframe is a Safety Class 1 instrument that has a protective earth terminal. Refer to the Safety
Summary page at the beginning of this manual for general safety procedures and the meaning of safety symbols appearing in
the manual and on the mainframe.

Overview 9
Electrostatic Discharge
The Modular Power System has components that can be damaged by ESD (electrostatic discharge).
Failure to observe standard anti-static practices can result in serious degradation of performance even
when complete failure does not occur.
When working on the Modular Power System, observe all anti-static work practices. This includes, but is not limited to:
•Working at a static-free station, such as a table covered with static-dissipative laminate or with a conductive table mat
(Agilent P/N 9300-0797).
•Using a conductive wrist strap (Agilent P/N 9300-0969 or 9300-0970).
•Grounding all metal equipment at the station to a single, common ground.
•Connecting low-impedance test equipment to static sensitive components only when those components have power
applied to them.
•Removing power from the Modular Power System before removing or installing printed circuit boards.
Service Tools and Equipment
The following tools are required to repair the Agilent 66000A MPS Mainframe:
•T15 and T25 TORX drivers.
•10mm and 7mm HEX NUT drivers.
•#2 POZI driver.
•Slot-head screwdrivers - small and medium.
•DIP component removal tool.
•Soldering iron and solder.
•De-solder removal tool.
•Needle-nose pliers.
•Anti-static work mat and wrist strap.
The following equipment is required to troubleshoot the Agilent 66000A MPS Mainframe:
Table 1-1. Service Test Equipment
Instrument Required Critical Specifications Recommended Model Use1
Power Cords (see Figure 1-1) Option #831 P/N 8120-5573 V,T
Option #833 P/N 8120-5568
Option #834 P/N 8120-5566
Option #841 P/N 8120-5572
Option #843 P/N 8120-5571
Option #845 P/N 8120-5570
Option #846 P/N 8120-5565
Option #847 P/N 8120-5567
Option #848 P/N 8120-5569
Test Cable BNC (male) to BNC (male) P/N 8120-1838 V,T
Mini-Grapper clip leads Wire Size: 24 AWG P/N 8120-3326 or 8120-3327 V,T
DFI RI connector Type: Terminal Block 4-pos.
(supplied with mainframe) P/N 1252-1488 V,T

Overview
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Table 1-1. Service Test Equipment (continued)
Instrument Required Critical Specifications Recommended Model Use1
MPS Power Module Agilent 661xxA Series V,T
DMM Agilent 34401A or equivalent T
Logic Probe Agilent 545A or equivalent T
Oscilloscope Bandwidth: 100 MHz Agilent 54504A or equivalent T
MPS Keyboard2Agilent 66001A V
Isolation transformer T
1 V = Verification; T = Troubleshooting.
2 Use of the keyboard is recommended for displaying selftest error messages.
Figure 1-1. Power Cords