Keysight E4991B User manual

Keysight E4991B
Impedance Analyzer
Troubleshooting
Guide

Notices
© Keysight Technologies, Inc. 2015
No part of this manual may be repro-
duced in any form or by any means
(including electronic storage and
retrieval or translation into a foreign
language) without prior agreement
and written consent from Keysight
Technologies, Inc. as governed by
United States and international copy-
right laws.
Manual Printing History
The manual’s printing date and part
number indicate its current edition.
The printing date changes when a
new edition is printed (minor correc-
tions and updates that are incorpo-
rated at reprint do not cause the date
to change). The manual part number
changes when extensive technical
changes are incorporated.
February 2015 First Edition
Manual Part Number
E4991-90200
Edition
First Edition, February 2015
Printed by Keysight Technologies
International Japan G.K., 1-3-3 Higa-
shikawasaki-cho, Chuo-ku, Kobe-shi,
Hyogo, Japan.
Warranty
The material contained in this
document is provided “as is,” and
is subject to being changed, with-
out notice, in future editions. Fur-
ther, to the maximum extent
permitted by applicable law, Key-
sight disclaims all warranties,
either express or implied, with
regard to this manual and any
information contained herein,
including but not limited to the
implied warranties of merchant-
ability and fitness for a particular
purpose. Keysight shall not be
liable for errors or for incidental
or consequential damages in con-
nection with the furnishing, use,
or performance of this document
or of any information contained
herein. Should Keysight and the
user have a separate written
agreement with warranty terms
covering the material in this doc-
ument that conflict with these
terms, the warranty terms in the
separate agreement shall control.
Technology Licenses
The hardware and/or software
described in this document are fur-
nished under a license and may be
used or copied only in accordance
with the terms of such license
Restricted Rights Legend
If software is for use in the perfor-
mance of a U.S. Government prime
contract or subcontract, Software is
delivered and licensed as “Commer-
cial computer software” as defined in
DFAR 252.227-7014 (June 1995), or
as a “commercial item” as defined in
FAR 2.101(a) or as “Restricted com-
puter software” as defined in FAR
52.227-19 (June 1987) or any equiva-
lent agency regulation or contract
clause. Use, duplication or disclosure
of Software is subject to Keysight
Technologies’ standard commercial
license terms, and non-DOD Depart-
ments and Agencies of the U.S. Gov-
ernment will receive no greater than
Restricted Rights as defined in FAR
52.227-19(c)(1-2) (June 1987). U.S.
Government users will receive no
greater than Limited Rights as defined
in FAR 52.227-14 (June 1987) or DFAR
252.227-7015 (b)(2) (November
1995), as applicable in any technical
data.
Safety Notices
CAUTION
A CAUTION notice denotes a haz-
ard. It calls attention to an operat-
ing procedure, practice, or the like
that, if not correctly performed or
adhered to, could result in dam-
age to the product or loss of
important data. Do not proceed
beyond a CAUTION notice until
the indicated conditions are fully
understood and met.
WARNING
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
the like that, if not correctly per-
formed or adhered to, could result
in personal injury or death. Do not
proceed beyond a WARNING
notice until the indicated condi-
tions are fully understood and
met.
NOTE
This Note sign denotes important
information. It calls attention to a
procedure, practice, or condition
that is essential for the user to
understand.

2 Impedance Analyzer
Caution
Do not exceed the operating input power, voltage, and
current level and signal type appropriate for the
instrument being used, refer to your instrument's Function
Reference.
Electrostatic discharge (ESD) can damage the highly
sensitive microcircuits in your instrument. ESD damage is most
likely to occur as the test fixtures are being connected or
disconnected. Protect them from ESD damage by wearing a
grounding strap that provides a high resistance path to ground.
Alternatively, ground yourself to discharge any static charge
built-up by touching the outer shell of any grounded instrument
chassis before touching the test port connectors.
Safety Summary
When you notice any of the unusual conditions listed below,
immediately terminate operation and disconnect the power cable.
Contact your local Keysight Technologies sales representative or
authorized service company for repair of the instrument. If you
continue to operate without repairing the instrument, there is a
potential fire or shock hazard to the operator.
•Instrument operates abnormally.
•Instrument emits abnormal noise, smell, smoke or a spark-like
light during operation.
•Instrument generates high temperature or electrical shock
during operation.
•Power cable, plug, or receptacle on instrument is damaged.
•Foreign substance or liquid has fallen into the instrument.

Impedance Analyzer 3
Manufacturer’s Declaration
Herstellerbescheinigung
GERAUSCHEMISSION
LpA < 70 dB
am Arbeitsplatz
normaler Betrieb
nach DIN 45635 T. 19
Manufacturer's Declaration
ACOUSTIC NOISE EMISSION
LpA < 70 dB
operator position
normal operation
per ISO 7779
Regulatory Compliance Information
This product complies with the essential requirements of the
following applicable European Directives, and carries the CE
marking accordingly:
•The Low Voltage Directive 2006/95/EC
•The EMC Directive 2004/108/EEC
To obtain Declaration of Conformity, please contact your local
Keysight Technologies sales office, agent or distributor.
Safety Notice Supplement
•This equipment complies with EN/IEC61010-1:2010.
•This equipment is of MEASUREMENT CATEGORY I (CAT I). Do
not use for CAT II, III, or IV.
•This equipment is a POLLUTION DEGREE 2, INDOOR USE
product.
•This equipment is tested in stand-alone condition and in
combination with the accessories supplied by Keysight
Technologies against the requirement of the standards
described in the Declaration of Conformity. If it is used as a
system component, compliance of related regulations and
safety requirements are to be confirmed by the builder of the
system.
•Do not connect the measuring terminals to mains.

4 Impedance Analyzer
General Safety Precautions
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 may impair the protection
provided by the equipment. Such noncompliance would also
violate safety standards of design, manufacture, and intended use
of the instrument. Keysight Technologies assumes no liability for
the customer’s failure to comply with these precautions.
•Ground the Instrument
To avoid electric shock, the instrument chassis and cabinet
must be grounded with the supplied power cable’s grounding
prong.
•DO NOT Operate in an Explosive Atmosphere
Do not operate the instrument in the presence of inflammable
gasses or fumes. Operation of any electrical instrument in such
an environment clearly constitutes a safety hazard.
•Keep Away from Live Circuits
Operators must not remove instrument covers. Component
replacement and internal adjustments must be made by
qualified maintenance personnel. Do not replace components
with the power cable connected. Under certain conditions,
dangerous voltage levels may remain even after the power
cable has been disconnected. To avoid injuries, always
disconnect the power and discharge circuits before touching
them.
•DO NOT Service or Adjust the Instrument Alone
Do not attempt internal service or adjustment unless another
person, capable of rendering first aid and resuscitation, is
present.
•DO NOT Substitute Parts or Modify the Instrument
NOTE The E4991B complies with INSTALLATION CATEGORY II as well as
POLLUTION DEGREE 2 in IEC61010-1. The E5080A is an INDOOR
USE product.
NOTE The LEDs in the E4991B are Class 1 in accordance with
IEC60825-1, CLASS 1 LED PRODUCT.

Impedance Analyzer 5
To avoid the danger of introducing additional hazards, do not
install substitute parts or perform unauthorized modifications
to the instrument. Return the instrument to a Keysight
Technologies Sales and Services Office for service and repair to
ensure that safety features are maintained in operational
condition.
•Dangerous Procedure Warnings
Warnings, such as the example below, precede potentially
dangerous procedures throughout this manual. Instructions
contained in the warnings must be followed.
Safety Symbols
General definitions of safety symbols used on the instrument or in
manuals are listed below.
WARNING Dangerous voltage levels, capable of causing death, are present in
this instrument. Use extreme caution when handling, testing, and
adjusting this instrument.
Instruction Manual symbol: the product is marked with
this symbol when it is necessary for the user to refer to
the instrument manual.
Alternating current.
Direct current.
On (Supply).
Off (Supply).
A chassis terminal; a connection to the instrument’s
chassis, which includes all exposed metal structure.
Standby.

6 Impedance Analyzer
Certification
Keysight Technologies certifies that this product met its
published specifications at the time of shipment from the factory.
Keysight Technologies further certifies that its calibration
measurements are traceable to the United States National
Institute of Standards and Technology, to the extent allowed by
the Institution’s calibration facility or by the calibration facilities of
other International Standards Organization members.
Documentation Warranty
The material contained in this document is provided "as is," and is
subject to being changed, without notice, in future editions.
Further, to the maximum extent permitted by applicable law,
Keysight disclaims all warranties, either express or implied with
regard to this manual and any information contained herein,
including but not limited to the implied warranties of
merchantability and fitness for a particular purpose. Keysight
shall not be liable for errors or for incidental or consequential
damages in connection with the furnishing, use, or performance
of this document or any information contained herein. Should
Keysight and the user have a separate written agreement with
warranty terms covering the material in this document that
conflict with these terms, the warranty terms in the separate
agreement will control.
Exclusive Remedies
The remedies provided herein are Buyer’s sole and exclusive
remedies. Keysight 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
Product maintenance agreements and other customer assistance
agreements are available for Keysight Technologies products.
For any assistance, contact your nearest Keysight Technologies
Sales and Service Office. Addresses are provided at the back of
this manual.

Impedance Analyzer 7
Manuals for E4991B
Keysight provides the following three manuals for E4991B. The
latest version of all documentations can be downloaded from
http://www.keysight.com/find/e4991b-manual.
Installation Guide
The installation guide provides start up setup information when
you use the E4991B for the first time, system recovery procedures
and troubleshooting information when Windows cannot boot up.
See this manual first when you use the E4991B for the first time.
Troubleshooting Guide
The troubleshooting guide (this manual) provides troubleshooting
information when operational problems are encountered on the
E4991B. See this manual when you need to troubleshoot the
E4991B.
Online Help
The online help provides the information about the quick start,
measurement operation, programming, built-in VBA, I/O interface
and error message. This is pre-installed in the E4991B. Press the
[Help] hard key on the front panel to open. Quick Start helps in
understanding the E4991B operation quickly.
The latest version of online help is available at:
http://ena.tm.keysight.com/e4991b/manuals/webhelp/eng/
The online help has context sensitive help, which is a great feature
of the E4991B help. It allows you to get information about the
selected softkey by pressing the Help key in the E4991B or by
pressing F1 in a keyboard attached to the E4991B or by clicking
the help button in a dialog box. With context sensitive help, users
can receive information quickly about the area the user is working
in the firmware of the E4991B. It provides information relevant to
the task that needs to be accomplished and reduces the time to
search relevant information required to complete a task.

8 Impedance Analyzer
In This Guide...
The following shows the contents of this manual.
Chapter 1, "Troubleshooting"
This chapter provides the procedure to isolate a faulty assembly
in E4991B.
Chapter 2, "Post Repair Procedure"
This chapter lists the procedures required to verify the E4991B
operation after an assembly is replaced with a new one.

Network Analyzer 9
Contents
1 Troubleshooting
Introduction 12
How to exit from the E4991B Measurement View 13
To Troubleshoot the Instrument 14
Primary Trouble Isolation 14
No Display Troubleshooting 16
Booting Process Troubleshooting 21
Troubleshooting Using Diagnostic Test 26
Diagnostic Test 26
Function Specific Troubleshooting 28
To Check the Front Panel 29
To Check the Touch Panel 29
To Check the LCD 30
To Check the External Keyboard 30
To Check the Mouse 31
To Check the External Monitor Output Port 31
To Check the External Trigger Input 31
To Check the GPIB 32
To Check the USB 32
Performance Test failure Troubleshooting 33
Recommended Adjustment for Performance Test failure 33
Performance failure Troubleshooting 33
Adjustment failure Troubleshooting 34
2 Post Repair Procedure
Post Repair Procedures 36
License file 36

10 Network Analyzer

11
Keysight E4991B Impedance Analyzer
Troubleshooting Guide
1
Troubleshooting
Introduction 12
How to exit from the E4991B Measurement View 13
To Troubleshoot the Instrument 14
No Display Troubleshooting 16
Booting Process Troubleshooting 21
Troubleshooting Using Diagnostic Test 26
Function Specific Troubleshooting 28
Performance Test failure Troubleshooting 33
This chapter provides the procedure to isolate a faulty assembly
in the E4991B.

12 Impedance Analyzer
1Troubleshooting
Introduction
WARNING These servicing instructions are for use by qualified
personnel only. To avoid possible electrical shock, do not
perform any servicing unless you are qualified to do so.
WARNING The opening of covers or removal of parts are likely to
expose dangerous voltages. Disconnect the instrument
from its power supply beforehand.
CAUTION Many of the assemblies in the instrument are very
susceptible to damage from ESD (electrostatic discharge).
Perform the following procedures only at a static-safe
workstation and wear a grounding strap.
CAUTION DO NOT operate without following instructions. Program or
files in the instrument may be broken.

Troubleshooting 1
Impedance Analyzer 13
How to exit from the E4991B Measurement View
Some troubleshooting procedures require you to exit from the
Keysight E4991B Measurement View. The following procedure
describes the steps to to exit from the Keysight E4991B
Measurement View.
Step 1. Connect a mouse to the connectors on the Keysight
E4991B rear panel.
Step 2. Turn the instrument on.
Step 3. Press key.
Step 4. Click Service.
Step 5. Click Exit.
Step 6. Click Yes in Exit menu. The Keysight E4991B exits from
Measurement View to Windows desktop.
Figure 1 Exit dialog box
NOTE If you want to return to the Measurement View, double-click the”
Keysight E4991B” icon on the desktop.
NOTE if you need to shut down the Keysight E4991B, press the standby
switch on the front panel.

14 Impedance Analyzer
1Troubleshooting
To Troubleshoot the Instrument
This section describes the basic troubleshooting procedural flow
when servicing the Keysight E4991B. The primary procedural tool
in this section is the flowchart. The flowchart contains the entire
troubleshooting path from the failure symptom to the isolation of
faulty assembly, and will direct you through the repair in an
orderly manner through the possible failure symptoms. Reference
letters (Yes/No) on the flowchart point to procedural steps that
briefly explain the next troubleshooting method to be performed.
Primary Trouble Isolation
The primary trouble isolation procedure can be performed without
disassembling the Keysight E4991B. Figure 2shows the trouble
isolation flow chart.
Step 1. Turn the instrument power on.
A few minutes after the E4991B is turned on, the measurement
view is displayed on the screen. The display screen should be
similar to Figure 10, “E4991B application,” on page 25.
Step 2. Check the display.
•If no display appears on the LCD after the Keysight E4991B is
turned on, go to “No Display Troubleshooting” on page 16.
•If the Keysight E4991B stops during booting process despite
something being displayed on the LCD, go to “Booting Process
Troubleshooting” on page 21.
Step 3. Check the basic function.
If the front-panel/keyboard/mouse controls, LCD display, data
storage, remote interface or other function (except the
measurement function) does not work correctly, go to “Function
Specific Troubleshooting” on page 28.
Step 4. Check the measurement function.
If the instrument fails performance test, go to “Performance Test
failure Troubleshooting” on page 33.
If the measurement function does not work correctly, perform the
diagnostic tests provided in the Keysight E4991B’s service
function. If the diagnostic tests fail, go to “Troubleshooting Using
Diagnostic Test” on page 26.

Troubleshooting 1
Impedance Analyzer 15
Figure 2 Primary trouble isolation flowchart

16 Impedance Analyzer
1Troubleshooting
No Display Troubleshooting
If the Keysight E4991B displays nothing despite being powered
from proper ac power line, isolate the failure in accordance with
the procedure shown in Figure 3.
Connect the keyboard to the Keysight E4991B rear panel
connector and start trouble isolation. The methods of trouble
isolation are described in the procedural step 1 to 6.

Troubleshooting 1
Impedance Analyzer 17
Figure 3 No display trouble isolation procedure

18 Impedance Analyzer
1Troubleshooting
Step 1. Check fan operation and DC monitor LED.
If the rear panel fan (blower) doesn’t run, a failure in power supply
is assumed. Remove the Keysight E4991B outer cover and check
if the following LEDs light:
•+3.3 V and +5 V DC monitor LEDs on A60 CPU module as
shown in Figure 4.
•LEDs on A51 DSP module as shown in Figure 5.
Figure 4 LEDs on CPU module
Figure 5 LEDs on DSP module