Tektronix SPECMON3B, SPECMON6B, SPECMON26B Service
xx
SPECMONB Series
ZZZ
Real-Time Signal Analyzer
Service Manual
www.tektronix.com
P077090900*
*
077-0909-00
Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries
or suppliers, and are protected by national copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication
supersedes that in all previously published material. Specifications and price change privileges reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
Contacting Tektronix
Tektronix, Inc.
14150 SW Karl Braun Drive
P.O. Box 5 0 0
Beaverto
USA
For product information, sales, service, and technical support:
n, OR 97077
In North America, call 1-800-833-9200.
Worl dwid e, visi t www.tektronix.com to find contacts in your area.
Table of Contents
Important safety information ............... ................................ ................................ ...... iii
General safety summary ..................................................................................... iii
Service safety summary........................ ................................ ............................... v
Terms in this manual ............... ................................ ................................ .......... vi
Symbols and terms on the product .......................................................................... vi
Preface ............................................................................................................. vii
Manual content............................................................................................... vii
Manual conventions .................. ................................ .................................. ..... vii
Related documentation ............................... ................................ ....................... viii
Theory of operation ................................................................................................ 1
General................... ................................ .................................. ..................... 2
Signal path and processing................................... .................................. ............... 2
Display panel .............................. ................................ ................................ ..... 3
Front panel...................................................................................................... 3
Rear panel ............... ................................ ................................ ....................... 3
Power supply .......................... .................................. ................................ ....... 4
Fans.............................................................................................................. 4
Adjustment procedure....................................... ................................ ....................... 5
Running alignments .............. ................................ .................................. ........... 5
Maintenance......................................................................................................... 7
Preventing ESD................................................................................................ 7
Inspection and cleaning .................... ................................ .................................. . 7
Restoring the instrument software ............................................................................... 11
Restore the operating system ................................................................................ 11
Get the latest software...................... .................................. ................................ 12
Removal and installation procedures.. .................................. ................................ ........ 13
Preparation............................... ................................ .................................. .... 13
Trim, cabinet, and module removal................. ................................ ........................ 15
Removal procedures.......................................................................................... 18
Troubleshooting.................................................................................................... 21
Service level................................................................................................... 21
Check for common problems................................................................................ 21
Diagnostics .................................................................................................... 24
Replaceable parts .................................................................................................. 39
Parts ordering information................................................................................... 39
Using the Replaceable parts list........... ................................ ................................ .. 41
SPECMONB Series Service Manual i
Table of Contents
List of Figure
Figure 1: Block diagram ...................... ................................ .................................. ... 1
Figure 2: Power supply and HDD drive locations ............................................................. 16
Figure 3: Main customer replaceable modules....... .................................. ........................ 17
Figure 4: Status indicator locations.......................................... .................................. .. 23
Figure 5: External parts......................... ................................ ................................ .. 43
Figure 6: Display and front panel................................................................................ 45
Figure 7: Modules................. ................................ ................................ ................ 47
Figure 8: Power supply and removable hard drive ............................................................ 49
Figure 9: Upper deck fans, misc. cables .................. ................................ ...................... 51
List of Tables
Table 1: Rear panel connectors .................... .................................. ............................. 3
Table 2: External inspection checklist. .................................. ................................ ......... 8
Table 3: Internal inspection check list............................... ................................ ............ 10
Table 4: Tools required for module removal ................................................................... 14
Table 5: Legend for accessing modules table .. .................................. .............................. 15
Table 6: Accessing modules...................................................................................... 15
Table 7: Failure symptoms and possible causes.......................................... ...................... 21
Table 8: Power converter board LED status indicators........................................................ 23
Table 9: Digital interface board LED status indicators........................................................ 23
Table 10: Hardware module diagnostic error messages................................... .................... 30
Table 11: Digital interface Board diagnostic error messages................. ................................ 30
Table 12: ADC board diagnostic error messages ........ ................................ ...................... 31
Table 13: DPSA board diagnostic error messages............................................................. 32
Table 14: RF Interface board diagnostic error messages...................................................... 33
Table 15: LO1 module diagnostic error messages ............................................................. 34
Table 16: LO2/Reference oscillator diagnostic error messages .... . . .... . ..... . ..... . ..... . ..... . ..... . ..... 35
Table 17: Front panel diagnostic error messages ...................... ................................ ........ 38
Table 18: External parts................... .................................. ................................ ...... 42
Table 19: Display and front panel ............................................................................... 44
Table 20: Modules................................................................................................. 46
Table 21: Power supply and removable hard drive ...... ................................ ...................... 48
Table 22: Upper deck fans, misc. cables........................................................................ 50
s
ii SPECMONB Series Service Manual
Important safety information
This manual contains information and warnings that must be followed by the user
for safe operation and to keep the product in a safe condition.
To safely perform service on this product, additional information is p rovided at
the end of this section. (See page v, Service safety summary.)
General safety summary
Use the product only as specified. Revie
avoid injury and prevent damage to this product or any products connected to it.
Carefully read all instructions. Retain these instructions for future reference.
Comply with local and national safety codes.
For correct and safe operation of the product, it is essential that you follow
generally accepted safety procedures in addition to the safety precautions specified
in this manual.
The product is designed to be used by trained personnel only.
Only qualified personnel who are aware of the hazards involved should remove
the cover for repair, maintenance, or adjustment.
Before use, always check the product with a known source to be sure it is
operating correctly.
This product is not intended for detection of hazardous voltages.
Use personal protective equipment to prevent shock and arc blast injury where
hazardous live conductors are exposed.
While using this product, you may need to access other parts of a larger system.
Read the safety sections of the other component manuals for warnings and
cautions related to operating the system.
w the following safety precautions to
When incorporating this equipment into a system, the safety of that system is the
responsibility of the assembler of the system.
To avoid fire or personal
injury
SPECMONB Series Service Manual iii
Use proper power cord. Use only the power cord specified for this product and
certified for the country of use.
Do not use the provided power cord for other products.
Ground the product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, make sure that the product is properly grounded.
Do not disable the power cord grounding connection.
Important safety information
Power disconne
source. See instructions for the location. Do not position the equipment so that
it is difficult to operate the power cord; it must remain accessible to the u ser at
all times to allow for quick disconnection if needed.
Connect and disconnect properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Observe all terminal ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating o f that terminal.
Do not float the common terminal above the rated voltage for that terminal.
The measuring terminals on this product are not rated for connection to mains or
Category II, III, or IV circuits.
Do not operate without covers. Do not operate this product with covers or panels
removed, or with the ca
Avoid exposed circuitry. Do not touch exposed connections and components
when powe r is p resent.
ct. The power cord disconnects the product from the power
se open. Hazardous voltage exposure is possible.
Do not operate with suspected failures. If you suspect that ther
product, have it inspected by qualified service personnel.
Disable the product if it is damaged. Do not use the product if it is damaged
or operates incorrectly. If in doubt about safety of the product, turn it off and
disconnect the power cord. Clearly mark the product to prevent its further
operation.
Before use, inspect voltage probes, test leads, and accessories for mechanical
damage and replace when dama
damaged, if there is exposed metal, or if a wear indicator shows.
Examine the exterior of the product before you use it. Look for cracks o r missing
pieces.
Use only specified replacement parts.
Use proper fuse. Useonlythefusetypeandratingspecified for this product.
Wear eye protection. Wear eye protection if exposure to high-intensity rays or
laser radiation exists.
Do not operate in wet/damp conditions. Be aware that condensation may occur if
a unit is moved from a cold to a warm environment.
ged. Do not use probes or test leads if they are
e is damage to this
iv SPECMONB Series Service Manual
Important safety information
Do not operate i
Keep product surfaces clean and dry. Remove the input signals before you clean
the product.
Provide proper ventilation. Refer to the installation instructions in the manual for
details on installing the product so it has proper ventilation.
Slots and openings are provided for ventilation and should never be covered or
otherwise obstructed. Do not push objects into any of the openings.
Provide a safe working environment. Always place the product in a location
convenient for viewing the display and indicators.
Avoid improper or prolonged use of keyboards, pointers, and button pads.
Improper or prolonged keyboard or pointer use may result in serious injury.
Be sure your work area meets applicable ergonomic standards. Consult w ith an
ergonomics professional to avoid stress injuries.
Use care when lifting and carrying the product. This product is provided with
handles for lifting and carrying.
Use only the Tektronix rackmount hardware specified for this product.
n an explosive atmosphere.
Servicesafetysummary
The Service safety summary section contains additional information required to
safely perform service on the product. Only qualified personnel should perform
service procedures. Read this Service safety summary and the General safety
summary before performing any service procedures.
To avoid electric shock. Do not touch exposed connections.
Do not service alone. Do not perform internal service or adjustments of this
product unles
present.
Disconnect power. To avoid electric shock, switch off the product power and
disconnect the power cord from the mains power before removing any covers or
panels, or opening the case for servicing.
Use care when servicing with power on. Dangerous voltages or currents may exist
in this product. Disconnect power, remove battery (if applicable), and disconnect
test leads before removing protective panels, soldering, or replacing components.
Verify safety after repair. Always recheck ground continuity and mains dielectric
strength after performing a repair.
s another person capable of rendering first aid and resuscitation is
SPECMONB Series Service Manual v
Important safety information
Termsinthismanual
These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
Symbols and terms on the product
These ter
The following symbol(s) may appear on the product:
ms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read
the mark
WARNING indicates an injury hazard not immediately accessible as you
read th
CAUTION indicates a hazard to property including the product.
ing.
e marking.
When this symbol is marked on the product, be sure to consult the manual
to find out the nature of the potential hazards and any actions which have to
betakentoavoidthem. (Thissymbolmayalsobeusedtorefertheuserto
ratings in the manual.)
vi SPECMONB Series Service Manual
Preface
Manual content
Manual conventions
This is the service manual for the SPECMONB Series Real-Time Signal
Analyzers.
This manual contains information related to servicing an SPECMONB Series
Real-Time
the instrument, or for a list of instrument specifications, refer to the appropriate
user document. (See page viii, Related documentation.)
Be sure to read the introductions to all procedures. These introductions provide
important information needed to perform the service correctly, safely, and
efficiently.
This manual uses certain conventions that you should become familiar with
before attempting service.
Signal Analyzer. For information related to installing and operating
Module
Plug-in module
Replaceable parts
Safety
The term module refers to a collection of items that are replaceable as a unit. A
module may contain electrical and mechanical assemblies, circuit boards, and
interconnecting cables.
The term Plug-in module refers to the units that plug into the Main digital
interface board.
This manual refers to any field-replaceable assembly or mechanical part by its
name or generically as a replaceable part. In general, a replaceable part is any
circuit board or assembly that is listed in the Replaceable Parts section.
Symbols and terms related to safety appear in the General Safety Summary found
at the beginning of this manual. Be sure to read both the General Safety Summary
and Service Safety Summary before performing any service to this instrument.
SPECMONB Series Service Manual vii
Preface
Related documentation
The following related English user documents are available if you need more
information about operating the instrument. These documents can be downloaded
from the Tektronix Web site (www.tektronix.com/manuals).
SPECMONB Series Real-Time Signal Analyzer Quick Start User Manual.
This document provides the basic information you need to install and operate
the instrument. The document includes a listing of the available instrument
options an
SPECMONB Series Real-Time Signal Analyzer Series Specifications and
Performa
contains the following technical information about the instrument:
Electri
d accessories.
nce Verification Technical Reference (English). This document
cal and physical specifications, including a list of certifications
and compliances.
A perfor
against guaranteed specifications.
SPECMO
(English). Describes the GPIB instrument programming commands and
interface.
SPECMONB Series Real-Time Signal Analyzer Declassification and Security
Instructions (English). Provides instruction on how customers with data
security concerns can sanitize or remove memory devices from the instrument.
mance verification procedure to check instrument performance
NB Series Real-Time Signal Analyzer Programmer Manual
viii SPECMONB Series Service Manual
Theory of operation
This section provides a basic description of the Real-Time Signal Analyzer (RSA)
operation. Refer to the following block diagram of the instrument while reading
through this
section.
Figure 1: Block diagram
SPECMONB Series Service Manual 1
Theory of operation
General
A processor system controls the instrument. The instrument features an XGA
resolution flat-panel display, a transparent touch-screen, and a front-panel with
direct acces
or other pointing device, and/or a keyboard.
s to common features. You can also use the instrument with a mouse
The instrum
Signal path and processing
RF signal path
Acquisition system
Processor system
An RF sign
The RF signal path consists of an attenuator, optional preamplifier, 1st converter,
and 2nd c
replica of a portion of the input signal range to an intermediate frequency (IF)
which can be sampled by a high-dynamic-range A/D converter.
The processor system controls the RF signal path.
The acquisition system samples the IF signal and converts it to digital signals.
These
direct display or by measurement applications to provide signal quality metrics
to the user. T he acquisition data processing is performed by one of several
field-programmable gate arrays (FPGAs) under control of the processor. The
processor performs m easurement applications.
The processor system consists of a COM Express PCI-based processor board and
a Digital interface board that connects the processor to the acquisition board.
ent uses the Microsoft Windows 7 operating system.
al enters the instrument through a direct N-type coaxial connection.
onverter. The purpose of the RF signal path is to translate a b and-limited
digital signals are then filtered numerically and processed either for
Trigger inputs
2 SPECMONB Series Service Manual
There are two coaxial trigger inputs. One is on the front panel below the display
and the other is on the rear panel. Both trigger inputs connect directly to the
Digital interface board. Trigger signals are processed by an FPGA on the Digital
interface board. The information from the trigger system is combined with
acquisition data by the processor system.
The Trigger Out signal is a coaxial connection on the front panel below the
display. The trigger out signal comes from the Acquisition Control FPGA,
through the Digital interface board.
Display panel
Theory of operation
Waveforms, spectral traces, measurement results, and control menus are displayed
on a 10.4 inch, color, active-matrix LCD display with touch panel.
Display system
Front panel
Rear
panel
Touch panel
The display system consists of a display adapter board. The display adapter board
sends text and waveform information to the display panel.
The displa
y adapter board sends information from the touch panel to the processor.
The touch panel is listed as a USB HID device in the Window Device Manager
tool.
The processor system detects changes in the front-panel switches and encoder. The
processor also turns the LEDs on and off. Communication between the processor
system and the front panel is performed over an internal USB connection.
The ON/STBY switch passes through the display adapter board, the PC carrier
board, the digital interface board, and to the PC board.
The removable HDD (hard disk drive) communicates over a SATA connection
directly to the processor system.
The following table describes the rear panel connectors.
Table 1: Rear panel connectors
Input or
Name
Reference In
Reference
Out
LAN
USB Input/Output USB Two USB 2.0 connectors
Keyboard Input
VGA Output D-Sub
Serial Input/Output D-Sub Serial communications port (COM1) to
Trigger In Input
Output
Input
Output BNC 10 MHz output or loop-through of user
Input/Output
Connector
type Description
BNC External time-base reference. See data
sheet for signal quality requirements.
Reference In signal
RJ-45
PS/2 Keyboard-only PS/2 connector
BNC TTL Gate/trigger input signal
10/100/1000baseT Ethernet connector
External monitor connector
processor system
SPECMONB Series Service Manual 3
Theory of operation
Table 1: Rear panel connectors (cont.)
Power supply
Input or
Name
Line In (blue)
MIC In (pink)
Headphone
+28 VDC Output BNC
GPIB Input/Output
Zero-span
Output
Input 3.5 mm
Input 3.5 mm
Output
Output BNC
Connector
type Description
Audio line input (disabled)
mono
Audio input signal (microphone)
mono
3.5 mm
stereo
IEEE-488
External headphone connection
Noise source drive power
General Purpose Interface Bus
Zero-span output connector
The Power conversion board provides instrument power. The Power conversion
board consists of several switching supplies that translate and balance the power
taken from the power supply module.
Power is distributed from the Power conversion board to both the RF Deck and
the Digital interface board.
The ON/STBY switch, located on the front panel, controls all of the power to the
instrument except for the part of the circuitry in the standby power supply.
Fans
Several fans p rovide cooling to the instrument:
Three fans are located in the RF Deck and are controlled by the RF Interface.
Two fans provide cooling for the Digital Deck o f the instrument.
The power supply module has an internal fan.
The COM Express PC board has a fan that is controlled by the COM Express
PC board.
The optional DPSA board contains a fan.
4 SPECMONB Series Service Manual
Adjustment procedure
There are no physical user adjustment procedures for the instruments. However,
you can run alignments from the product application.
Running alignments
Alignments are adjustment procedures run by the instrument using internal
reference signals and measurements, and do not require any external equipment or
connections.
There are two settings for Alignments:
Automatically align as needed (Auto mode)
Run alignments only when the Align Now button is pressed
If Automatically align as needed is selected, alignments run whenever the
Signal Analyzer detects a sufficient change in ambient conditions to warrant an
alignment.
If Run alignments only when “Align Now” button is pressed is selected,
the Signal Analyzer never runs an alignment unless you manually initiate an
alignment using the Align Now button.
Alignment status
Initiating an alignment
NOTE. There are a few critical adjustments that must run occasionally even if
matically align as needed is not enabled.
Auto
The instrument displays a message on screen when it needs to run an alignment. If
essage is displayed, you can assume that the instrument is properly aligned.
no m
To initiate an alignment:
1. Select Setup > Alignments.
2. Click the Align Now button.
The instrument runs an alignment procedure. It displays status messages as the
alignment procedure is running. If the instrument fails the alignment procedure,
the it displays an error message. If the instrument fails an alignment, run
Diagnostics (Tools > Diagnostics) to determine why the alignment failed.
NOTE. While an alignment is running, both the IF and IQ outputs are disabled.
SPECMONB Series Service Manual 5
Adjustment procedure
Alignments during
warm-up
Alignments during normal
operation
Alignments are not
ations
calibr
Alignments are
oscillator alignments); the instrument uses default alignment values (if Auto mode
is selected).
NOTE. Instrument performance is not warranted during the specified 20 minute
warm-up period.
Once the instrument reaches operating temperature, a full alignment is run every
two hours (for up to two minutes). Alignments can run more frequently if the
operating temperature changes. If an alignment becomes necessary during a
measurement cycle (if Auto mode is selected), the measurement is aborted and
an alignm
measurement cycle restarts.
Alignme
reference signals and measurements. Calibrations can only be performed at a
Tektronix service center and require the use of traceable test equipment (signal
sources and measuring equipment) to verify the performance of the instrument.
nts are adjustment procedures run by the instrument using internal
not run during the 20 minute warm-up period (except for RF
ent procedure is run. Once an alignment procedure is completed, the
6 SPECMONB Series Service Manual
Maintenance
Preventing ESD
This section contains the information needed to do periodic and corrective
maintenance on the instrument.
Before servicing this product, read the Safety summary at the front of the manual
and the ESD information below.
CAUTION. Static discharge can d amage any semiconductor component in this
instrumen
When performing any service that requires internal access to the instrument,
adhere to the following precautions to avoid damaging internal modules and their
components due to electrostatic discharge (ESD).
t.
Minimize handling of static-sensitive circuit boards and components.
Transport and store static-sensitive modules in their static protected containers
or on a metal rail. Label any package that contains static-sensitive boards.
Inspection and cleaning
Discharge the static voltage from your body by w earing a grounded antistatic
wrist strap while handling these modules. Perform service of static-sensitive
modules only at a static-free work station.
Do not allow anything capable of generating or holding a static charge on the
work station surface.
Handle circuit boards by the edges when possible.
Do not slide the circuit boards over any surface.
Avoid handling circuit boards in areas that have a floororwork-surface
covering capable of generating a static charge.
This section describes how to inspect for dirt and damage. It also describes how
to clean the exterior and interior of the instrument. Inspection and cleaning are
done as preventive maintenance. Preventive maintenance, when done regularly,
may pre
Preventive maintenance consists of visually inspecting and cleaning the
instr
vent instrument malfunction and enhance its reliability.
ument and using general care when operating it.
SPECMONB Series Service Manual 7
Maintenance
General care
Interior Ccleaning
Exterior cleaning
How often preve
ntive maintenance should be performed depends on the severity
of the environment in which you use the instrument. A proper time to perform
preventive maintenance is just before instrument adjustment.
The cabinet helps keep dust out of the instrument and should normally be in
place when operating the instrument.
Use a dry, low-velocity stream of air to c lean the interior of the chassis. Use a
soft-bristle, non-static-producing brush for cleaning around c omponents. If you
must use a liquid for minor interior cleaning, use a 75% isopropyl alcohol solution
and rinse with deionized water.
WARNING. Before performing any procedure that follows, power down the
instrument and disconnect it from line voltage. Failure to do so could cause
personal injury, or death.
Clean the exterior surfaces of the chassis with a dry lint-free cloth or a soft-bristle
brush. If any dirt remains, use a cloth or swab dipped in a 75% isopropyl alcohol
solution. Use a swab to clean narrow spaces around controls and connectors.
Do not use abrasive compounds on any part of the chassis that may damage the
chassis.
Clean the On/Standby switch using a dampened cleaning towel. Do not spray or
wet the switch directly.
CAUTION. Avoid the use of chemical cleaning agents which might damage the
plastics used in this instrument. Use only deionized water when cleaning the menu
buttons or front-panel buttons. Use a 75% isopropyl alcohol solution as a cleaner
and rinse/wipe with deionized water. Before using any other type of cleaner,
consult your Tektronix Service Center or representative.
Inspect the outside of the instrument for damage, wear, and missing parts, using
the following table as a guide. Immediately repair defects that could cause
personal injury or lead to further damage to the instrument.
Table 2: External inspection checklist
Item Inspect for Repair action
Cabinet, front panel, and
cover
Front-panel knob Missing, damaged, or loose
Cracks, scratches,
deformations, damaged
hardware
knob
Repair or replace defective
module
Repair or replace missing or
defective knob
8 SPECMONB Series Service Manual
Table 2: External inspection checklist (cont.)
Item Inspect for Repair action
Connectors
Carrying handle, and
cabinet feet
Accessories
Broken shells, cracked
insulation, and deformed
contacts; dirt in connectors
Correct operation Repair or replace defective
Missing items or parts of
items, bent pins, broken or
frayed cables, and damaged
connectors
Repair or replace defective
modules; clear or wash out
dirt
module
Repair or replace damaged
or missing items, frayed
cables, and defective
modules
Maintenance
Flat panel display cleaning
The display is a soft plastic display and must be treated with care during cleaning.
CAUTION. Improper cleaning agents or methods can damage the flat panel
display. Avoid using abrasive cleaners or comme rcial glass cleaners to clean the
display surface. Avoid spraying liquids directly on the display surface. Avoid
bing the display with excessive force.
scrub
Clean the flat panel display surface by gently wiping the display with a
n-room wipe (such as Wypall Medium Duty Wipes, #05701, available from
clea
Kimberly-Clark Corporation).
he display is very dirty, moisten the wipe with distilled water or a 75%
If t
isopropyl alcohol solution and gently wipe the display surface. Avoid using
excess force or you may damage the plastic display surface.
CAUTION. To prevent moisture from getting inside the instrument during external
cleaning, use only enough liquid to dampen the cloth or applicator.
To access the inside of the instrument for inspection and cleaning, refer to the
Removal and installation procedures in this section.
Inspect the inside of the instrument for damage and wear, using the following
table as a guide. Defects found should be repaired immediately.
CAUTION. To prevent damage from electrical arcing, ensure that circuit boards
and components are dry before applying power to the instrument.
SPECMONB Series Service Manual 9
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