Agilent Technologies 89410A User manual

Service Guide
Agilent Technologies
89410A Vector Signal Analyzer
Part Num er: 89410-90103
Supersedes: 89410-90065
Printed in USA
March 2002
© Copyright 2001-2002 Agilent Technologies Inc.

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The information contained in this document is subject to change ithout
notice.
Agilent Technologies makes no arranty of any kind ith regard to this
material, including but not limited to, the implied arranties of
merchantability and fitness for a particular purpose. Agilent
Technologies shall not be liable for errors contained herein or for
incidental or consequential damages in connection ith the furnishing,
performance, or use of this material.
Safety Information
The follo ing safety notes are used throughout this manual. Familiarize
yourself ith each of the notes and it’s meaning before operating this
instrument.
WARNING: Warning denotes a hazard. It calls attention to a procedure
which, if not correctly performed or adhered to, could result in injury or loss of life.
Do not proceed beyond a warning note until theindicated conditions are fully
understood and met.
CAUTION: Caution denotes a hazard. It calls attention to a procedure that, if not
correctly performed or adhered to, could result indamage to ordestruction ofthe
instrument. Do not proceed beyond a caution sign until the indicated conditions are
fully understood and met.
WARNING: This is a Safety Class 1 Product (provided with a protective
earthing ground incorporated in the power cord). The mains plug shall only be
inserted in a socket outlet provided with a protected earth contact. Any
interruption of the protective conductor inside or outside of the product is likely to
make the product dangerous. Intentional interruption is prohibited.

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WARNING: These servicing instructions are for use by qualified personnel
only. To avoid electrical shock, do not perform any servicing unless you are
qualified to do so.
WARNING: The power cord is connected to internal capacitors that may
remain live for 5 seconds after disconnecting the plug from it’s power supply.
Warranty
This Agilent Technologies instrument product is arranted against
defects in material and orkmanship for a period of three years from
date of shipment. During the arranty period, Agilent Technologies ill,
at its option, either repair or replace products hich prove to be
defective.
For arranty service or repair, this product must be returned to a service
facility designated by Agilent Technologies. Buyer shall prepay shipping
charges to Agilent Technologies and Agilent Technologies shall pay
shipping charges to return the product to Buyer. Ho ever, Buyer shall
pay all shipping charges, duties, and taxes for products returned to
Agilent Technologies from another country.
Agilent Technologies arrants that its soft are and firm are designated
by Agilent Technologies for use ith an instrument ill execute its
programming instructions hen properly installed on that instrument.
Agilent Technologies does not arrant that the operation of the
instrument, or soft are, or firm are ill be uninterrupted or error-free.

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LIMITATION OF WARRANTY
The foregoing arranty shall not apply to defects resulting from improper
or inadequate maintenance by Buyer, Buyer-supplied soft are or
interfacing, unauthorized modification or misuse, operation outside of
the environmental specifications for the product, or improper site
preparation or 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 BUYER’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.

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In this manual…
Chapter 1 Troubleshooting the Analyzer
●Provides step-by-step instructions for isolating most failures to the
faulty assembly
Chapter 2 Adjusting the Analyzer
●Provides step-by-step instructions for adjusting the analyzer
Chapter 3 Replacing Assemblies
●Provides step-by-step instructions to follo before and after replacing
an assembly. This chapter also provides step-by-step instructions for
disassembling the analyzer
Chapter 4 Replaceable Parts
●Provides ordering information and lists the replaceable parts
Chapter 5 Circuit Descriptions
●Provides the overall instrument description and individual assembly
description
Chapter 6 Voltages and Signals
●Sho s here the signals and voltages are used in the analyzer and
describes each signal
Chapter 7 Internal Test Descriptions
●Describes the po er-on test, calibration routine, fault log messages,
and self tests
Chapter 8 Backdating
●Provides information necessary to modify this manual for
instruments that differ from those currently being produced
Chapter 9 Quick Reference
●Provides all the block diagrams and the “A90/A91 Motherboard
Voltages” table

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Notation Conventions
Before you use this book, it is important to understand the types of keys on
the front panel of the analyzer and how they are denoted in this book.
Hardkeys
●Hardkeys are front-panel buttons hose functions are al ays the
same. Hardkeys have a label printed directly on the key. In this book,
they are printed like this: [Hardkey].
Softkeys
●Softkeys are keys hose functions change ith the analyzer’s current
menu selection. A softkey’s function is indicated by a video label to
the left of the key (at the edge of the analyzer’s screen). In this book,
softkeys are printed like this: [softkey].
Toggle Softkeys
●Some softkeys toggle through multiple settings for a parameter.
Toggle softkeys have a ord highlighted (of a different color) in their
label. Repeated presses of a toggle softkey changes hich ord is
highlighted ith each press of the softkey. In this book, toggle softkey
presses are sho n ith the requested toggle state in bold type as
follo s:
“Press [key name on]” means “press the softkey [key name] until the
selection on is active.”
Shift Functions
●In addition to their normal labels, keys ith blue lettering also have a
shift function. This is similar to shift keys on a pocket calculator or
the shift function on a type riter or computer keyboard. Using a
shift function is a t o-step process. First, press the blue [Shift] key
(at this point, the message “shift” appears on the display). Then press
the key ith the shift function you ant to enable. Shift function are
printed as t o key presses, like this:
[Shift] [Shift Function]

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Numeric Entries
●Numeric values may be entered by using the numeric keys in the
lo er right hand ENTRY area of the analyzer front panel. In this
book, values hich are to be entered from these keys are indicted
only as numerals in the text, like this:
Press 50, [enter]
Ghosted Softkeys
●A softkey label may be sho n in the menu hen it is inactive. This
occurs hen a softkey function is not appropriate for a particular
measurement or not available ith the current analyzer
configuration. To sho that a softkey function is not available, the
analyzer ‘’ghosts’’ the inactive softkey label. A ghosted softkey
appears less bright than a normal softkey. Settings/values may be
changed hile they are inactive. If this occurs, the ne settings are
effective hen the configuration changes such that the softkey
function becomes active.

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The Agilent 89410A at a Glance

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Agilent 89410A Front Panel
1-A softkey’s function changes as different menus are displayed. Its
current function is determined by the video label to its left, on the
analyzer’s screen.
2-The analyzer’s screen is divided into t o main areas. The menu area, a
narro column at the screen’s right edge, displays softkey labels. The
data area, the remaining portion of the screen, displays traces and other
data.
3-The POWER s itch turns the analyzer on and off.
4-Use a 3.5-inch flexible disk (DS,HD) in this disk drive to save your
ork.
5-The KEYBOARD connector allo s you to attach an optional keyboard
to the analyzer. The keyboard is most useful for riting and editing
Instrument BASIC programs.
6- The SOURCE connector routes the analyzer’s source output to your
DUT. Output impedance is selectable: 50 ohms or 75 ohms.
7-The EXT TRIGGER connector lets you provide an external trigger for
the analyzer.
8-The PROBE POWER connectors provide po er for
various Agilent active probes.
9-The CHANNEL 1 input connector routes your test signal or DUT output
to the analyzer’s receiver. Input impedance is selectable: 50 ohms, 75
ohms, or 1 megohm.
10-Use the DISPLAY hardkeys and their menus to select and manipulate
trace data and to select display options for that data.
11-Use the SYSTEM hardkeys and their menus to control various system
functions (online help, plotting, presetting, and so on).
12-Use the MEASUREMENT hardkeys and their menus to control the
analyzer’s receiver and source, and to specify other measurement
parameters.
13-The REMOTE OPERATION hardkey and LED indicators allo you to
set up and monitor the activity of remote devices.
14-Use the MARKER hardkeys and their menus to control marker
positioning and marker functions.

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15-The knob’s primary purpose is to move a marker along the trace. But
you can also use it to change values during numeric entry, move a cursor
during text entry, or select a hypertext link in help topics.
16-Use the Marker/Entry key to determine the knob’s function. With the
Marker indicator illuminated, the knob moves a marker along the trace.
With the Entry indicator illuminated, the knob changes numeric entry
values.
17-Use the ENTRY hardkeys to change the value of numeric parameters
or to enter numeric characters in text strings.
18-The optional CHANNEL 2 input connector routes your test signal or
DUT output to the analyzer’s receiver. Input impedance is selectable: 50
ohms, 75 ohms, or 1 megohm. For easy of upgrading, the CHANNEL 2
BNC connector is installed even if option AY7 (second input channel) is
not installed.
For more details on the Agilent 89410A front panel, display the online help
topic ‘’Front Panel.’’
Before applying power
Verify that the product is set to match the available line voltage, the
correct fuse is installed, and all safety precautions are taken. Note the
instrument's external markings described in “Safety symbols and
instrument markings” on page x.
Ground the instrument
To minimize shock hazard, the instrument chassis and cover must be
connected to an electrical protective earth ground. The instrument must
be connected to the ac po er mains through a grounded po er cable,
ith the ground ire firmly connected to an electrical ground (safety
ground) at the po er outlet. Any interruption of the protective
(grounding) conductor or disconnection of the protective earth terminal
ill cause a potential shock hazard that could result in personal injury.
Fuses
Use only fuses ith the required rated current, voltage, and specified
type (normal blo , time delay). Do not use repaired fuses or
short-circuited fuse holders. To do so could cause a shock or fire hazard.
Safety symbols and instrument markings
Symbols and markings in manuals and on instruments alert you to
potential risks, provide information about conditions, and comply ith