Service Guide
ESA Spectrum Analyzers
This manual provides documentation for the following instruments:
E4401B (9 kHz - 1.5 GHz)
E4402B (9 kHz - 3.0 GHz)
E4404B (9 kHz - 6.7 GHz)
E4405B (9 kHz - 13.2 GHz)
E4407B (9 kHz - 26.5 GHz)
and
E4411B (9 kHz - 1.5 GHz)
E4403B (9 kHz - 3.0 GHz)
E4408B (9 kHz - 26.5 GHz)
Manufacturing Part Number: E4401-90474
Printed in USA
February 2014
Supersedes: April 2013
© Copyright 2000 - 2014 Agilent Technologies, Inc.
The information contained in this document is subject to change without notice.
Agilent Technologies makes no warranty of any kind with regard to this material,
including but not limited to, the implied warranties 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 with the
furnishing, performance, or use of this material.
Safety Notes
This product has been designed and tested in accordance with IEC Publication
1010, Safety Requirements for Electronic Measuring Apparatus, and has been
supplied in a safe condition. The instruction documentation contains information
and warnings which must be followed by the user to ensure safe operation and to
maintain the product in a safe condition.
The following examples illustrate warning and caution statements that are used
throughout this manual.
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 the indicated 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 in damage to or destruction of the
instrument. Do not proceed beyond a caution sign until the indicated conditions are
fully understood and met.
The following safety notes are used throughout this manual. Familiarize yourself
with each of the notes and its meaning before operating this instrument.
WARNING This is a Safety Class 1 Product (provided with a protective earth ground
incorporated in the power cord). The mains plug shall only be inserted in a
socket outlet pr ovided with a prot ective ea rth contact . Any inte rruption of t he
protective conductor inside or outside of the product is likely to make the
product dangerous. Intentional interruption is prohibited.
2
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 If this product is not used as specified, the protection provided by the
equipment could be impaired. This product must be used in a normal
condition (in which all means for protection are intact) only.
CAUTION This product is designed for use in Installation Category II and Pollution Degree 2
per IEC 101 and 664 respectively.
Warranty
This Agilent Technologies instrument product is warranted against defects in
material and workmanship for a period of one year from date of shipment. During
the warranty period, Agilent Technologies will, at its option, either repair or
replace products which prove to be defective.
For warranty 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. However, Buyer shall pay all shipping charges, duties,
and taxes for products returned to Agilent Technologies from another country.
Agilent Technologies warrants that its software and firmware designated by
Agilent Technologies for use with an instrument will execute its programming
instructions when properly installed on that instrument. Agilent Technologies does
not warrant that the operation of the instrument, or software, or firmware will be
uninterrupted or error-free.
3
LIMITATION OF WARRANTY
DO NOT THROW BATTERIES AWAY BUT
COLLECT AS SMALL CHEMICAL WASTE.
sk780a
The foregoing warranty shall not apply to defects resulting from improper or
inadequate maintenance by Buyer, Buyer-supplied software 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.
Lithium Battery Disposal
When the battery on the A4 processor assembly (3 volt lithium battery, part
number 1420-0556) is exhausted and/or ready for disposal, dispose of it according
to your country’s requirements. You can the battery to your nearest Agilent
Technologies Sales and Service office for disposal, if required. Refer to “Parts
List” in Chapter 5.
4
Contents
1. Troubleshooting the Analyzer
What You Will Find in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Replacement Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
After an Analyzer Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
ESD Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Check the Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Problems at Instrument Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Troubleshooting an Inoperative Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Check the Analyzer Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
If the Line Fuse Has Blown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
If the Fan is Not Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Checking the Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Troubleshooting the LCD Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Viewing Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Isolating an LO, IF, or Video Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Checking Detector Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Checking Corrected versus Uncorrected Performance Using Video Shift On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Verifying the A3 IF Assembly Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Checking a Horizontal Trace With No Signal or Noise Floor Present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Checking an Analyzer That Displays a Low Signal Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Checking an Analyzer That Displays a High Noise Floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Checking an Analyzer Signal Amplitude That Appears Too High . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Checking an Analyzer Signal That Is Distorted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Checking an Analyzer Signal That Is Off Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Checking the 21.4 MHz Alignment Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Using the Internal Service-Diagnostic Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Timebase (in Alignments Menu) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Timebase (in Service Menu) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Video Shift On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Align Now . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Visible Align . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Noise Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Load Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Restoring System Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Troubleshooting the A4 Processor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Initial Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Bootrom Self-Test Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Clearing Dynamic RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Clearing Flash EPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Troubleshooting the A2 1.5 GHz Tracking Generator (E4401B and E4411B) (Option 1DN/1DQ) . . . . . . . . . . . . . . . . . . . 40
If Output is Unleveled (TG Unleveled message displayed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
If the TG LO is Unlocked (TG LO Unlocked message displayed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
If the Tracking Generator Is Not Properly Recognized by the Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
If Flatness is Out of Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
If Vernier Accuracy is Out of Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
If Harmonics and Spurious Outputs are Too High . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
If Power Sweep is Not Functioning Properly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
If There is No Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Troubleshooting the A2 3.0 GHz Tracking Generator (E4402B, E4403B, E4404B, E4405B, E4407B, and E4408B) (Option
1DN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Troubleshooting the Digital Demod Hardware (E4402B, E4404B, E4405B, and E4407B) (Option B7D and B7E) . . . . . . 47
Troubleshooting Analyzer Mode Errors Caused By the DDRF or DSP Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5
Contents
Troubleshooting the Digital Demodulation Hardware When Running the cdmaOne or GSM Personalities . . . . . . . . . . 48
Troubleshooting the A7A13 Noise Source Driver Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
2. Troubleshooting the RF Section
What You Will Find in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Verifying the RF Section Performance
(E4401B and E4411B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
RF Performance Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Verifying the RF Section Performance
(E4402B and E4403B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Quick Check RF Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Detailed RF Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Verifying the RF Section Performance
(E4404B, E4405B, E4407B, and E4408B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
“Quick Check” RF Procedure in Low Band (Non-Preselected) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Detailed RF Troubleshooting for Low Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Quick Check RF Procedure for High Bands (Preselected) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Detailed RF Troubleshooting for High Bands (Preselected) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
3. Block Diagrams
What You Will Find in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
A8 1.5 GHz RF Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Input Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Input Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Low-Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
First Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
First IF Amplifier/Filter/Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Second Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
21.4 MHz Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Frequency Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
LO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Interconnections to Other Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
A8 RF Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
A8J10 Input Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
A8A1 3.0 GHz RF Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
A8A1A1 Reference/Third Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
A8A1A2 Front End/LO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
A8A2 Second Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
A8A3 dc Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
A8A4 LO Amplifier/IF Switch (LOIS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
A8A5 Input Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
A8A6 YIG-Tuned Filter/Mixer (RYTHM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
A8FL1 3.1 GHz Low-Pass Filter (LPF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
A7A4 Frequency Extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
A3 IF Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Cal Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
21.4 MHz Bandpass Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Log Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Linear Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Interconnections to Other Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Downconverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
A4 Processor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
6
Contents
Analog Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Analyzer Battery Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Interconnections to Other Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
A4A1 Flash SIMM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
A4A2 DRAM SIMM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
A5 Power Supply Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Interconnections to Other Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
A7 Motherboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
A1 Display/Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Motherboard Mnemonics and Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Tracking Generator Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Digital Demod DSP/Fast ADC Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Digital Demod RF Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
4. Options and Accessories
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
How to Order Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
12 Vdc Power Cable (Option A5D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
3 Year Calibration Contract (Option W32) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
3 Year Service Support (Option W30) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
5 Year Calibration Contract (Option W52) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
5 Year Service Support (Option W50) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
to 75 Matching Pad (Option 1D7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
50
Tracking Generator (Option 1DN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
50 Ohm
75 Ohm Input Impedance (Option 1DP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
75 OhmTracking Generator (Option 1DQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
8566 Series Programming Code Compatibility
(Option 266) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
ACPR Dynamic Range Extension (Option 120) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Additional Manual Set (Option 0B1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
APC 3.5 Input Connector (Option BAB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Backpack Operating and Carrying Cases
(Option 042/044) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Benchlink Spectrum Analyzer (Option B70) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Benchlink Web Remote Control Software
(Option 230) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Bluetooth FM Demodulation (Option 106) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Bluetooth General Purpose Bundle (Option 303) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Bluetooth Measurement Personality (Option 228) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Bluetooth Premium Bundle (Option 304) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Cable TV Measurement Personality (Option 227) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
cdmaOne Measurement Personality (Option BAC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Color Display (Option 049) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Commercial Calibration with Test Data
(Option UK6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Component Level Service Documentation (Option 0BV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Delete Manual Set (Option 0B0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Digital Signal Processing and Fast ADC (Option B7D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Distance to Fault Accessory Kit (Option B7K) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Distance to Fault Measurement Personality (Option 225) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Enhanced Memory Upgrade (Option B72) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
External Mixing (Option AYZ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
7
Contents
Fast Digitized Time Domain Sweeps (Option AYX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Firmware Upgrade Kit (Option UE2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
FM Demodulation (Option BAA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Front Panel Protective Cover (Option UK9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
GPIB and Parallel Interface (Option A4H) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
GSM Measurement Personality (Option BAH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Hard Transit Case (Option AXT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
High Stability Frequency Reference (Option 1D5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
IF, Sweep and Video Ports (Option A4J) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Low Emission (Option 060) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Low Frequency Extension (Option UKB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Narrow Resolution Bandwidth (Option 1DR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Noise Figure Measurement Personality and Hardware
(Option 219) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Operating and Carrying Cases (Option AYT/AYU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Performance Bundle (Option B75) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Phase Noise Measurement Personality (Option 226) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Pre-amplifier (Option 1DS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Rack Mount Kit With Handles (Option 1CP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
RF and Digital Communications Hardware
(Option B74) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
RF Communications Hardware (Option B7E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
RS-232 and Parallel Interface (Option 1AX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Service Documentation (Option 0BW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Time-Gated Spectrum Analysis (Option 1D6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
TV Trigger and Picture on Screen (Option B7B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
/75 Minimum Loss Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
50
Matching Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
75
AC Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Broadband Preamplifiers and Power Amplifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Carrying Strap (Part Number E4401-60028) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
External Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
GPIB Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Agilent 11970 Series Harmonic Mixers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Agilent 11974 Series Preselected Millimeter Mixers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Agilent E1779BA Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Parallel Interface Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
RF and Transient Limiters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
RF Bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
RS-232 Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
5. Parts List
What You Will Find in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
How to Order Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Direct Mail-Order System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Direct Phone-Order System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Component-Level Information Packets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
Ordering CLIPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
8
Contents
Contacting Agilent Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
How to Return Your Analyzer for Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Service Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Original Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Other Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
6. Replacing Assemblies
What You Will Find in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
Service tools you will need . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
After a spectrum analyzer repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248
Removal and Replacement Procedures in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
Instrument Outer Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
Chassis Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253
A1 Front Frame Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254
Extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
Connector Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
Front Frame Subassemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
A1A2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
A1A1 Front Panel Interface Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
Front Panel RPG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266
Keypad/Flex Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267
Lens/Keypad Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
Display Backlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
Vibration Support Bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271
Replacing the Vibration Support Bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271
A2 1.5 GHz Tracking Generator Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
Tracking Generator Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
Tracking Generator RF Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
Tracking Generator Control Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
Tracking Generator Output Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
1.5 GHz Tracking Generator RF Output Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278
A2 3.0 GHz Tracking Generator Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
A3 IF Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282
A4 Processor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
9
Contents
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284
A4A1 and A4A2 Flash and DRAM SIMM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
A4MAU58 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286
Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286
A5 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 288
A5B1 Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
A6 Floppy Drive and Speaker Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
A7 Motherboard Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
Card Cage Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
FM Demod, SIO, GPIB, RS-232, Noise Source Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
Digital Demod Assemblies Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298
A8 1.5 GHz RF Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305
A8 3.0 GHz RF Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309
RF Subassemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311
A8A1 OCXO Precision Frequency Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311
A8A4 LO Amp/IF Switch Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312
A8A5 Input Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313
A8A6 YIG-Tuned Filter/Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
A8A2 Second Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317
RF Input Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319
1.5 GHz RF Input Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
7. Post-Repair Procedures
What You Will Find in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325
Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
Finding abnormal indications during adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
Periodically verifying calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
Replacing or repairing an assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
List of Tests and Adjustments for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327
List of Tests and Adjustments for Post-Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330
8. Performance Verification and Adjustment Software
What You Will Find in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
Instruments with Option 266 or Option 290 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
N7800A Calibration and Adjustment Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
ESA Field Test Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
10
1 Troubleshooting the Analyzer
Chapter 1 11
Troubleshooting the Analyzer
What You Will Find in This Chapter
What You W ill Find in This Chapter
This chapter provides information that is useful when starting to troubleshoot an
analyzer failure. It provides procedures for troubleshooting common failures and
isolating proble ms in the analy zer. Assembly descriptions are located in Chapter 3,
"Block Diagrams.”
Component level in formation co ntaining materi al lists , schematics , and component
location diagrams, is available separately.
12 Chapter 1
Troubleshooting the Analyzer
Before You Start
Before You Start
There are four things you should do before starting to troubleshoot a failure:
o Check that you are familiar with the safety symbols marked on the instrument,
and read the general saf et y cons iderations and the safe ty note definitions giv en
in the front of this guide.
o The analyzer contains static sensitive components. Read the section entitled
“ESD Information” on page 1-15 in this chapter.
o Become familiar with the organization of the troubleshooting information in
this chapter.
o Read the rest of this section.
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 opening of covers or removal of parts is likely to expose dangerous
voltages. Disconnect the product from all voltage sources while it is being
opened.
WARNING The detachable power cord is the instrument disconnecting device. It
disconnects the mains circ uits fr om the mains supply befor e other part s of the
instrument. The fron t panel s witch is only a sta ndby switc h and is not a LINE
switch (disconnecting device).
CAUTION Always position the instrument for easy access to the disconnecting device
(detachable power cord).
WARNING To prevent electrical shock, disconnect the analyzer from mains before
cleaning. Use a dry cloth or one slightly dampened with water to clean the
external case parts. Do not attempt to clean internally.
WARNING For continued protection against fire hazard, replace fuses, and or circuit
breakers only with same type and ratings. The use of other fuses, circuit
breakers or materials is prohibited.
Chapter 1 13
Troubleshooting the Analyzer
DO NOT THROW BATTERIES AWAY BUT
COLLECT AS SMALL CHEMICAL WASTE.
sk780a
Before You Start
WARNING This is a Safety Class 1 Product (provided with a protective earth ground
incorporated in the power cord). The mains plug shall only be inserted in a
socket outlet pr ovided with a prot ective ea rth contact . Any inte rruption of t he
protective conductor inside or outside of the product is likely to make the
product dangerous. Intentional interruption is prohibited.
CAUTION Always use the three-prong ac power cord supplied with this product. Failure to
ensure adequate ea rth gr ounding by not u sin g this cord may cause p rod uct damag e.
CAUTION Before switching on this instrument, make sure of the following:
• the correct fuse is installed
• the supply voltage is in the specified range
CAUTION This instrument has auto-ranging line voltage input, be sure the supply voltage is
within the specified range and voltage fluctuations do not to exceed 10 percent of
the nominal supply voltage.
WARNING The Agilent Technologies E4402B, E4403B, E4404B, E4405B, E4407B,
E4408B, E4411B, E7402A, E7405A may be used with an E1779B
Rechargeable Battery Pa ck which co ntains a Ni- Cd batt ery. The battery must
be recycled or disposed of properly.
14 Chapter 1
Troubleshooting the Analyzer
Before You Start
Replacement Assemblies
The analyzer assemblies are not repairable to the component level. The following
assemblies must be replaced as an assembly.
• RF assembly (E4401B, E4411B)
• RF assembly and associated microcircuits
(E4402B, E4403B, E4404B, E4405B, E4407B, E4408B)
• Frequency extension assembly (E4404B, E4405B, E4407B, E4408B)
•IF assembly
• Power supply assembly
• Processor assembly
• Motherboard
• Speaker/floppy assembly
•Display
• Display interface board
• Option boards:
— Fast ADC assembly (Option AYX)
— FM Demod assembly (Option BAA)
— IF, Sweep, and Video Ports assembly (Option A4J)
— ACPR dynamic range enhancement assembly (Option 120)
— Bluetooth FM Demod assembly (Option 106)
— Noise Source Drive assembly (part of Option 219)
— Digital Demod DSP assembly (Option B7D)
— Digital Demod RF assembly (Option B7E)
The tracking generator assembly (Option 1DN or 1DP) consists of three
subassemblies and is repairable to the subassembly level.
After an Analyzer Repair
If one or more analyzer assemblies have been repaired or replaced, perform the
related adjustments and performance verification tests. Refer to Table 7-2 in
Chapter 7 for the related adjustments and performance verification tests required
for each assembly.
ESD Information
Protection from Electrostatic Discharge
Electrostatic discharge (ESD) can damage or destroy electronic components. All
work on electronic assemblies should be performed at a static-safe workstation.
Figure 1-1 shows an example of a static-safe workstation using two types of ESD
protection:
o Conductive table-mat and wrist-strap combination.
o Conductive floor-mat and heel-strap combination.
Chapter 1 15
Troubleshooting the Analyzer
Before You Start
Both types, when used together, provide a significant level of ESD protection. Of
the two, only the table-mat and wrist-strap combination provides adequate ESD
protection when used alone. To ensure user safety, the static-safe accessories must
provide at least 1 megohm of isola tion from gro und. Refer to Table 1-1 on page 16
for information on ordering static-safe accessories.
WARNING These techniques for a static-safe workstation should not be used when
working on circuitry with a voltage potential greater than 500 volts.
Figure 1-1 Example of a Static-Safe Workstation
Table 1-1 Static Safe Accessories
Part Number Description
85043-80013 Set includes: 3M static control mat 0.4 m 0.6 m (16 inches 23
inches) and 4.6 cm (15 ft) ground wire, wrist strap, and wrist-strap cord.
9300-0980 Wrist-strap cord 1.5 m (5 ft)
16 Chapter 1
Table 1-1 Static Safe Accessories
Part Number Description
9300-1367 Wrist-strap, color black, stainless steel, without cord, has four adjustable
links and a 7 mm post-type connection.
9300-1308 ESD heel-strap (reusable 6 to 12 months)
Troubleshooting the Analyzer
Before You Start
Chapter 1 17
Troubleshooting the Analyzer
Before You Start
Handling of Electronic Components and ESD
The possibility of unseen dama ge caus ed by ES D is prese nt when ever c omponents
are transported, stored , or used. Th e risk of ESD damage ca n be greatl y reduced by
close attention to how all components are handled.
o Perform work on all components at a static-safe workstation.
o Keep static-generating materials at least one meter away from all components.
o Store or transport components in static-shielding containers.
CAUTION Always handle printed circuit board assemblies by the edges. This will reduce the
possibility of ESD damage to components and prevent contamination of exposed
plating.
Test Equipment Usage and ESD
o Before connecting any coaxial cable to an analyzer connector, momentarily
short the center and outer conductors of the cable together.
o Personnel should be grounded with a 1 megohm resistor-isolated wrist-strap
before touching the center pin of any connector and before removing any
assembly from the analyzer.
o Be sure that all analyzers are properly earth-grounded to prevent build-up of
static charge.
For Additional Information about ESD
For more information about preventing ESD damage, contact the Electrical Over
Stress/Electr ostatic Discharge (EOS/ESD) Association, Inc. The ESD standards
developed by this agency are sanctioned by the American National Standards
Institute (ANSI).
18 Chapter 1
Troubleshooting the Analyzer
Check the Basics
Check the Basi cs
A problem can often be resolved by repeating the procedure you were following
when the problem occurred. Before calling Agilent Technologies or returning the
analyzer for service, please mak e the follow ing checks:
o Check the line fuse.
o Is there power at the receptacle?
o Is the analyzer tur ned on? Make sure t he fan is running , which indica tes that the
power supply is on.
o If the display is dark or dim, press the upper
Viewing Angle key in the
upper-left corner of the fr ont panel. If the d is pla y i s too bright, adjust the lower
Viewing Angle key in the upper-left corner of the front panel.
o If other equipment, cables, and connectors are being used with your analyzer,
make sure they are connected properly and operating correctly.
o Review the procedure for the measure ment being perf ormed when th e pro blem
appeared. Are all the settings correct?
o If the analyzer is not functioning as expected, return the analyzer to a known
state by pressing the
Preset key and Factory Preset (if present).
Some analyzer settings are not affected by a Preset. Refer to the
“Front-Panel Key Referenc e” ch apter of t he user’s guide for information on
settings affected by a Preset.
o Is the measurement being performed, and the results that are expected, within
the specifications and capabilities of the analyzer? Refer to the appropriate
“Specifications and Characteristics” chapters in the specifications guide for
more details.
o In order to meet specif ications , the an alyzer must be aligned. Either Aut o Align
All must be selected (press
System, Alignments, Auto Align, All), or the
analyzer must be manually aligned at least once per hour, or whenever the
temperature changes more than 3C. When
Auto Align, All is selected, AA
appears on the left edge of the di spl ay. Refer to the appropriat e “Spe cifications
and Characteristics” chapters in the specifications guide for more details.
o Is the analyzer displaying an error message? If so, refer to the instrument
messages/functional tests guide.
o If the necessary test equipment is available, perform the performance
verification tests in the calibration guide or use the performance verification
software. Record all results on a Performance Verification Test Record form
which follows the tests .
o If the equipment to perform the performance verification tests is not available,
you may still be able to perform the functional checks in the user’s guide.
Chapter 1 19
Troubleshooting the Analyzer
Problems at Instrument Power-Up
Problems at Instrument Powe r-Up
This section describe s symptoms that c an occur when the a nalyze r is fi rst p owered
on.
CAUTION Immediately unplug the analyzer from the ac power line if the unit shows any of
the followin g symptoms:
• Smoke, arcing, or unusual noise from inside the unit, except as noted below.
• No response of any kind when unit is plugged into ac power mains and turned
on.
• The analyzer ac power fuse blows.
• A circuit breaker or fuse on the main ac power line opens.
These potentially serious faults must be corrected before proceeding. Refer to
“Troubleshooting an Inoperative Analyzer” on page 21.
Note that these analyzers are equipped with a speaker and normally emit noise
from the speaker at power-up. This is not a problem; adjust the volume control as
desired.
The analyzer will also occasionally emit “clicking” noises. These are normal and
are related to the analyzer self alignment routines.
If the analyzer always turns on when power is applied, check the rear of the
analyzer. There is an “always on” power mode switch that can be changed. Refer
to the rear panel features section of the user’s guide for information on this switch.
20 Chapter 1
Troubleshooting the Analyzer
Troubleshooting an Inoperative Analyzer
Troubleshooting an Inoperative Analyzer
When an analyzer appears to be dead (no display or inoperative fan) there is often
little evidence that points directly to the cause. This section provides steps and
solutions to typical failu re mo des rel at in g to an inoper ative analyzer.
Before troubleshooting an analyzer, ensure that it has been set up correctly.
Check the Analyzer Setup
Perform the steps in the section titled “Check the Basics” earlier in this chapter.
Initial Checks
Perform the following initial checks when first troubleshooting an inoperative
analyzer.
1. Is the fan running?
a. If the fan is not running, refer to the section “If the Fan is Not Operating” on
page 22.
b. If the fan is running, this indicates the power supply is functioning at least
partially.
2. Is the display on?
a. If the display is blank, refer to the section “Checking the Power Supplies”
on page 23. Also verify that the firmware is good by performing the
“Bootrom Self-Test Check” on page 38.
b. If the display is on and the fan is running, suspect one or more power
supplies is being pulled down, or a defective processor assembly. In either
case, the analyzer outer case and inner shield must be removed. Refer to
Chapter 6 for removal procedures.
3. Check the power supplies.
a. To check the power supply voltages, refer to the section “Checking the
Power Supplies” on page 23.
b. If the supplies all measure good, suspect a defective processor, or a
defective LCD or interface board.
Chapter 1 21
Troubleshooting the Analyzer
Troubleshooting an Inoperative Analyzer
4. Perform the following checks for the processor assembly.
a. Is the analyzer “clicking?” The analyzer should occasionally emit
“clicking” noises. These are related to the analyzer automatic self alignment
routines, and indicate the processor is basically functioning. When the
analyzer is cold, there will be more self alignment activity (more clicking)
than when it is warm.
If you do not hear any clicks after a few minutes, suspect a defective
processor assembly. Refer to the section “T roub leshooti ng the A4 Processor
Assembly” on page 37.
b. Are the processor assembly LEDs all out? There are LEDs along the top
edge of the processor assembly. These should all be off. To check their
functionality, cycle the analyzer power. The processor LEDs should all go
on for a few seconds, then go off. If one or more LEDs remains on, suspect
the processor assembly is defective. Refer to the section “Bootrom Self-Test
Check” on page 38.
c. If the analyzer is clicking, and all of the processor LEDs are out, suspect a
defective LCD or a defective front panel interface board. Refer to the
section “Troubleshooting the LCD Display” on page 25.
If the Line Fuse Has Blown
If the line fuse h as blown, perha ps a non standa rd fuse wi th to o low a curren t rat ing
was installed. If the l ine fus e sti ll bl ows, susp ect th at the power suppl y assembl y is
defective.
WARNING For continued protection against fire hazard, replace fuses, and or circuit
breakers only with same type and ratings. The use of other fuses, circuit
breakers or materials is prohibited.
If the Fan is Not Operating
CAUTION The power supply may be hot if the instrument has been operating without the fan
running. Allow the instrument to cool down before troubleshooting.
1. If there is no display:
a. Unplug the line-power cord.
b. Change the switch at the rear of the analyzer so the power is always on.
Refer to the rear panel features section of the user’s guide for information
on this switch. This will bypass the front panel power switch.
22 Chapter 1
Troubleshooting the Analyzer
Troubleshooting an Inoperative Analyzer
c. If the fan still does not turn on, suspect a defective power supply assembly.
Refer to the section “Checking the Power Supplies” on page 23, to check
individual supply voltages.
d. If the fan starts, this indicates a problem with the front panel switch or the
circuitry to the front panel switch.
2. If there is a display:
a. Remove the analyzer outer case. Refer to Chapter 6 for removal details.
b. Measure the fan voltage.
c. The fan voltage can be checked directly at the center of the fan where the
wires connect. The fan normally operates on a voltage ranging from 5 to
16 Vdc depending on the temperature of the analyzer. As analyzer
temperature increases, fan voltage should become more negative, increasing
the speed of the fan.
If the correct voltage is present, suspect a defective fan.
If the voltage is not pre sent, check t he plug where the fan wires att ach to the
power supply board. If this looks good, suspect a defective power supply.
Refer to Chapter 6 for information on how to remove the power supply.
Checking the Power Supplies
The power supply test board is no longer supplied. If the power supply is suspect,
change the power supply. All ESA models use the same power supply, so
substitution is possible to determine if the power supply is defective.
WARNING The analyzer contains potentially hazardous voltages. Refer to the safety
symbols provided on the analyzer, and in the general safety instructions in
this guide, before operating the unit with the cover removed. Ensure that
safety instructi ons ar e stric tly foll owed. Failur e to do so can resu lt in seve re o r
fatal injury.
The +15 V and –12.6 V supplies can be measured directly on the probe power
connector located on the front of the instrument. See Figure 1-2 for these test
points. If –12.6 V is within limits, it is a reasonably good indicator that –15 V is
within specifications.
Chapter 1 23
Troubleshooting the Analyzer
Troubleshooting an Inoperative Analyzer
Figure 1-2 Probe Power Connector Voltages
If All Low Voltage Supplies are At or Near Zero Volts
If all the power supplies are dead, suspect a defective A5 power supply assembly.
Refer to Chapter 6 for removal instructions.
If Some Low Voltage Supplies are At or Near Zero Volts
If some supplies are functioning while others are dead or low, it is possible that one
of the assemblies in the analyzer is loading down the power supply.
In this case it is necessary to sequentially remove the assemblies, taking care to
disconnect the line-power cord before removing any assembly. A logical first step
would be to unplug the RF assembly ribbon cable fr om the motherboar d at the rear
of the instrument. This disconnects the complete RF section without having to
remove it from the chassis. Refer to Chapter 6 for any other assembly removal
procedures.
After an assembly is disconnected or removed, plug the line-power cord back into
the analyzer and remeasure the supply that was down. If it is still down, continue
with the assembly removal. If the supply is now up, suspect the last assembly
removed as being defective.
24 Chapter 1
Troubleshooting the Analyzer
Troubleshooting the LCD Display
Troubleshoot in g the LCD Display
The only adjustment that can be made to the LCD display is the viewing angle.
This is found on the front panel of the analyzer in the upper left corner.
Viewing Angle
1. Verify that the analyzer has gone through a full power-on sequence. Refer to
the section “Troubleshooting an Inoperative Analyzer” on page 21.
2. If the display is da rk (not visi ble), c onnect an exte rnal VGA moni tor t o the r ear
panel VGA output conn ector on th e anal yzer. It is possible that some mult isync
monitors may not be able to lock to a 60 Hz sync pulse. If the video
information is not present on the external VGA monitor, the most probable
cause is the A4 processor assembly.
3. If the external VGA monitor is functi oni ng, ver i fy that the ribbon cables going
to and from the A1A1 front panel interface assembly are aligned properly and
securely plugged into the connectors.
4. T o determine whet her the A1A2 LCD display or the A1A1 fr ont panel interfa ce
assembly is defective, remove the front frame assembly. See Chapter 6,
"Replacing Assemblies.”
WARNING The inverter board contains high vo ltage for th e backlights . Carefu lly r emove
the inverter board by taking out the two screws securing it to the front frame,
then turn it over to access the CN1 connector.
Refer to Table 1-2 on page 25 and carefully measure the voltage coming into
the inverter board at CN1 pins 1-6 with a digital voltmeter.
Table 1-2 Measurement Locations and Expected Voltages
Measurement Location Expected Voltage from A1A1 Front
Panel Interface
CN1 Pin 1 0 Vdc
CN1 Pin 2 0 Vdc
CN1 Pin 3 5 Vdc
CN1 Pin 4 5 Vdc
CN1 Pin 5 30 mV
CN1 Pin 6 2.5 Vdc
The display is not field-repairable, and must be replaced as an assembly. Refer to
Chapter 5 for part-number information.
Chapter 1 25
Troubleshooting the Analyzer
Troubleshooting the LCD Display
Figure 1-3 LCD Troubleshooting Measurement Locations
If the voltages are correct, the most probable cause of failure is the A1A2 LCD
assembly.
NOTE The LCD has two backlights to illuminate the LCD. If both backlights are
defective, the screen will be dark. The backlights can be replaced individually,
however, it is improbable that both backlights are defective simultaneously. If one
backlight is defective, the LCD will illuminate but the dimness will be noticeable,
and you will need to replace A1A2DS1 or A1A2DS2. It is recommende d that bot h
backlights be replaced at the same time if it is likely that one simply wore out.
26 Chapter 1
Troubleshooting the Analyzer
Isolating an LO, IF, or Video Problem
Isolating an LO, IF, or Video Problem
This section provides techniques for isolating amplitude failures along the signal
path.
Checking Detector Modes
The instrument has three detector modes known as peak, negative peak, and
sample. All of these detectors are located on the A4 processor board. Normal
instrument power up routes the detected video signal through the positive peak
detector only. If there are no graticules, signal information, or screen annotations,
refer to the section “Troubleshooting the LCD Display” on page 25. The
assumption from this point on is that the graticules and annotations have come up
on the screen, but the noise floor and signal information is not present.
1. If no video is present on the anal yzer scr een switch t o Sample or Nega tive Peak
detector mode by pressing
2. If the video signal appears in one of these two modes, the most probable cause
is the A4 proc essor board itself.
Det/Demod, Detector, and the proper softkey.
3. If there is no video information present in any detector mode, inject a signal
into the IF ass embly as per “Verifying the A3 IF Assembly Performance” on
page 28. This step will produce 2 Vdc (IF_VIDEO) at the output of the IF
assembly. The 2 Vdc can be measured on the motherboard at A7J13 pin 24 if
the analyzer is an E4403B, E4408B, or E4411B. If you do not measure a dc
level at approximatel y 2 Vdc, the IF assembly is the most proba ble cause. Refe r
to Figure 1-2.
4. If you measure 2 Vdc on the output of the IF assembl y but do not see a flat line
at the top of the graticule, there may be a problem between the output of the IF
assembly and the inp u t to the A4 processor board. Check f o r an o pen t race or a
bent pin on the A7 motherboard.
5. If you measure 2 Vdc right up to the IF_VIDEO input on the A4 processor
board and still don't have a flat
line near the top of the screen, the A4 processor board is the most probable
cause.
Checking Corrected versus Uncorrected Performance Using Video Shift On/Off
If you have a frequency respons e fa il ure such as a power hole or power spike, you
should turn the video shift off to see if the digital correction values are having an
adverse effect on the analyzer performance.
1. Turn the video shift off by pressing
Enter, Service, Video Shift On Off (Off).
2. If the power hole or spike goes away, perform the Frequency Response
Chapter 1 27
System, Service, (Password = 2010),
Troubleshooting the Analyzer
Isolating an LO, IF, or Video Problem
Adjustments using the Adjustment Software. Refer to section “Using the
Internal Service-Diagnostic Routines” on page 32 for more information about
the video shift function.
3. If the power hole or power spike does not go away after re-adjusting the
frequency response (flatness), the RF assembly is the most probable cause.
Verifying the A3 IF Assembly Performance
NOTE At frequencies >50 MHz in zero span, the gain of the A3 IF assembly will
increase, necessi tati ng the i nput l evel t o be decr eased f or top of s creen r espons e. If
the analyzer is in full span and the 21.4 MHz input frequency has a power level of
20 dBm, the displayed response will be the inverse of the RF assembly flatness.
Setting the Video Shift Off as stated in “Checking Corrected versus Uncorrected
Performance Using Video Shift On/Off” on page 27 will result in a flat line. In
narrow spans, the flatne ss corr ecti on will be done by cha nging th e A3 IF as sembly
gain. In large spans, when it is not practical to change the A3 IF assembly gain as
the analyzer sweeps, video shift is used for flatness correction. Some video shift
will be used for flatness cor recti on even wh en A3 IF assembl y gains are also used,
but the maximum video shift will be less that 1 dB, unless there is insuff icient A3
IF assembly gain available.
1. Turn the Auto Align off by pressing
2. Perform an Align Now All by pressing
System, Alignments, Auto Align, Off.
System, Alignments, Align Now, All.
3. Verify that the initial failure viewed on the analyzer screen is acceptable.
a. If the signal on screen appears to be cor rect, t urn th e Auto Ali gn back o n by
pressing
System, Alignments, Auto Align, All and make sure the signal
remains correct.
b. If the signal is not correct press
Load Defaults. (Press this key twice for the de faults to load.)
NOTE When the defaults are loaded, the IF filter response of some resolution bandwidth
System, Alignments, Load Defaults,
settings may appea r distor ted and th e amplitud e response may vary si gnifican tly as
the resolution bandwidth is changed.
c. If the signal is not correct with the defaults loaded proceed to the next step.
Otherwise:
1. Perform Align Now All by pressing
All and wait for the alignment to complete. Three complete alignment
System, Alignments, Align Now,
sequences will be performed.
2. Turn Auto Al ign back on by pr essing
All.
System, Alignments, Auto Align,
3. Verify the analyzer performance now that the A3 IF assembly has had
the defaults loaded and the auto align has been turned back on.
28 Chapter 1
Troubleshooting the Analyzer
Isolating an LO, IF, or Video Problem
4. If the signal on screen is still not correct perform “Checking Detector Modes”
on page 27. Now inject a 21.4 MHz signal at 10 dBm from a synthesizer into
the A3 IF assembly. With the reference level at 0 dBm, the input attenuator set
to 0 dB, and center frequency at 50 MHz in zero span, a flat line should appear
at the top graticule.
5. If the signal is not at the top graticule, measure A7J13 pin 24 on the
motherboard with a voltmeter and verify 2 Vdc. Refer to Figure 1-1.
6. If 2 Vdc is not present the most probable cause would be the A3 IF assembly,
but first check for a bent pin on the A7J2 motherboard connector pin 16
(IF_VIDEO). Refer to Figure 1-2.
7. If 2 Vdc is present the most probable cause is either an A7 motherboard trace
problem to the A4 proce ssor board, a bent pin on A7J7 motherbo ard co nnecto r,
or the A4 processor board itself.
Checking a Horizontal Trace With No Signal or Noise Floor Present
1. For E4402B, E4404B, E4405B, and E4407B conn ect the Amptd Ref out to t he
Input.
Check the ADC circuitry on the A4 processor board by pressing
FREQUENCY 50 MHz, SPAN, Zero Span, Input/Output, Amptd Ref Out
(On),
AMPLITUDE, –27 dBm for 50 , or +24.75 dBmV for 75 input (for
E4401B or E4411 B). For any other ESA, press
SPAN
, Zero Span, Input/Output, Amptd Ref Out (On), AMPLITUDE,
–20 dBm (–27 dBm for E4401B or E4411B). This should provide a 2 Vdc
Preset, FREQUENCY, 50 MHz,
Preset,
output from the A3 IF assembly.
2. Connect a voltmeter to A7J13 pin 24 on the A7 motherboard to probe the
output of the A3 IF assembly. If the IF assembly is working properly the
voltmeter will read approximately 2 Vdc. Refer to Figure 1-2.
If you measure 2 Vdc at this poi nt, the mos t proba ble cau se is t he A4 proce sso r
board.
If you DO NOT measure 2 Vdc at this point, check the integrity of the A3 IF
assembly as stated i n “Verifying the A3 IF Assembly Perfor mance” on page 28.
NOTE It is possib le that there is a bent pin (IF_VIDEO) on the A7 mot herboard
connectors or an open trace on the A7 motherboard itself. Follow the 2 Vdc from
the output of the A3 IF assembly to the input of the A4 processor board.
Checking an Analyzer That Displays a Low Signal Level
A low signal level can be caused by a number of assemblies inside the analyzer.
1. Verify that this problem is not related to the detectors by performing the
procedure as stated in “Checking Detector Modes” on page 27.
Chapter 1 29
Troubleshooting the Analyzer
Isolating an LO, IF, or Video Problem
2. The two most common assemblies for a low signal level would be the RF
assembly an d the A3 IF assembly resp ectively. To verify the RF assembly
performance see Chapter 2, “Troubleshooting the RF Section,” on page 57
3. If step 2 measures properly, refer to “Verifying the A3 IF Assembly
Performance” on page 28.
Checking an Analyzer That Displays a High Noise Floor
A high noise floor is often caused by a low gain situation. When the analyzer
adjusts for excessive low gain, the displayed noise level will rise too high.
1. Verify the ADC performance per the proced ure in “Checki ng an Analyz er That
Displays a Low Signal Level” on page 29 before taking any measurements.
2. The RF assembly is the most probable cause due to an over-correction during
the frequency respons e adjustme nt. To verify the RF assembly p erformance se e
Chapter 2, “Troubleshooting the RF Section,” on page 57.
If the 21.4 MHz IF alignment signal from the RF assembly was not getting to
the A3 IF assembly the noise floor may rise. Verify the 21.4 MHz alignment
signal is getting switched to the A3 IF assembly as per “Checking the
21.4 MHz Alignment Signal” on page 31.
3. Verify the A3 IF assembly performance per the procedure stated in “Verifying
the A3 IF Assembly Performance” on page 28 if the RF assembly appears to be
O.K.
Checking an Analyzer Signal Amplitude That Appears Too High
1. Verify the A3 IF assembly performance per the procedure stated in “Verifying
the A3 IF Assembly Performance” on page 28.
2. Verify the RF assembly performance as per Chapter 2, “Troubleshooting the
RF Section,” on page 57
3. Verify the A4 processor board performance per the procedure stated in
“Checking a Horizontal Trace With No Signal or No ise Floor Present” on page
29.
Checking an Analyzer Signal That Is Distorted
1. Verify the A3 IF assembly performance per the procedure stated in “Verifying
the A3 IF Assembly Performance” on page 28.
2. Verify the RF assembly perfor mance as per Cha pter 2, "T roub leshooting t he RF
Section.”
30 Chapter 1
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