Tektronix MSO54B User manual

5 Series B Mixed Signal Oscilloscope
Service Manual
MSO54B, MSO56B, MSO58B
Warning: The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified
to do so. Refer to all safety summaries prior to performing service.
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077-1726-00 May 2023

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 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
• In North America, call 1-800-833-9200.
• Worldwide, visit to www.tek.com find contacts in your area.

Table of Contents
Important safety information..........................................................................................................................................................5
General safety summary........................................................................................................................................................5
To avoid fire or personal injury........................................................................................................................................5
Probes and test leads..................................................................................................................................................... 7
Service safety summary.........................................................................................................................................................8
Terms in this manual.............................................................................................................................................................. 8
Terms on the product............................................................................................................................................................. 8
Symbols on the product......................................................................................................................................................... 9
Preface........................................................................................................................................................................................10
Supported products..............................................................................................................................................................10
Replaceable parts................................................................................................................................................................ 10
Where to find operating information.....................................................................................................................................10
Theory of operation..................................................................................................................................................................... 11
Power supply........................................................................................................................................................................11
Carrier interface assembly................................................................................................................................................... 12
Main board and front-end board.......................................................................................................................................... 12
Front panel and display........................................................................................................................................................12
Adjustment procedures............................................................................................................................................................... 13
Adjustment interval.............................................................................................................................................................. 13
Adjustment after repair.........................................................................................................................................................13
Maintenance................................................................................................................................................................................14
Preventing ESD................................................................................................................................................................... 14
Inspection and cleaning....................................................................................................................................................... 14
Exterior cleaning (other than display)........................................................................................................................... 14
Flat panel display cleaning........................................................................................................................................... 15
Interior cleaning............................................................................................................................................................ 15
Lubrication.................................................................................................................................................................... 16
Returning the instrument for service.............................................................................................................................16
Removal and replace procedures........................................................................................................................................ 17
Required equipment..................................................................................................................................................... 17
Remove front-panel knobs............................................................................................................................................17
Remove SATA riser board assembly............................................................................................................................ 18
Remove feet................................................................................................................................................................. 18
Remove handle.............................................................................................................................................................19
Remove rear grill and case...........................................................................................................................................19
Remove rear chassis assembly....................................................................................................................................20
Remove the baffle bracket............................................................................................................................................21
Remove the power supply assembly............................................................................................................................ 23
Remove carrier interface assembly.............................................................................................................................. 25
Remove the AFG riser assembly..................................................................................................................................27
Remove handle hub assembly......................................................................................................................................28
Remove the main fan assembly....................................................................................................................................28
Troubleshooting 5 Series B MSO.........................................................................................................................................29
Service level................................................................................................................................................................. 29
Table of Contents
5 Series B Mixed Signal Oscilloscope Service Manual MSO54B, MSO56B, MSO58B 3

Check for common problems........................................................................................................................................30
Equipment required...................................................................................................................................................... 30
Troubleshooting flow chart............................................................................................................................................31
Troubleshoot the power supply.....................................................................................................................................32
Instrument self tests......................................................................................................................................................34
Software updates..........................................................................................................................................................34
Power supply module replacement...............................................................................................................................34
Replaceable parts list..................................................................................................................................................................35
Parts ordering information....................................................................................................................................................35
Module servicing.................................................................................................................................................................. 35
Abbreviations....................................................................................................................................................................... 35
Using the replaceable parts list............................................................................................................................................36
Front cover and rear case....................................................................................................................................................37
Carrier interface board and rear chassis..............................................................................................................................39
Baffle and power supply module..........................................................................................................................................42
Mid-plane chassis................................................................................................................................................................ 43
Front panel and display........................................................................................................................................................45
Table of Contents
4

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, see the Service safety summary that follows the General safety summary.
General safety summary
Use the product only as specified. Review the following safety precautions to avoid injury and prevent damage to this product or any
products connected to it. Carefully read all instructions. Retain these instructions for future reference.
This product shall be used in accordance with local and national 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.
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
Use proper power cord
Use only the power cord specified for this product and certified for the country of use.
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, ensure that the product is properly
grounded. Do not disable the power cord grounding connection.
Power disconnect
The power cord disconnects the product from the power 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 user 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.
Use only insulated voltage probes, test leads, and adapters supplied with the product, or indicated by Tektronix to be suitable for the
product.
Important safety information
5 Series B Mixed Signal Oscilloscope Service Manual MSO54B, MSO56B, MSO58B 5

Observe all terminal ratings
To avoid fire or shock hazard, observe all rating and markings on the product. Consult the product manual for further ratings information
before making connections to the product.
Do not exceed the Measurement Category (CAT) rating and voltage or current rating of the lowest rated individual component of a product,
probe, or accessory. Use caution when using 1:1 test leads because the probe tip voltage is directly transmitted to the product.
Do not apply a potential to any terminal, including the common terminal, that exceeds the maximum rating of 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 Category III or IV circuits.
Do not operate without covers
Do not operate this product with covers or panels removed, or with the case open. Hazardous voltage exposure is possible.
Avoid exposed circuitry
Do not touch exposed connections and components when power is present.
Do not operate with suspected failures
If you suspect that there is damage to this 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 damaged. Do not use probes or
test leads if they are 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 or missing pieces.
Use only specified replacement parts.
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.
Do not operate in an explosive atmosphere
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 with an ergonomics professional to avoid stress injuries.
Important safety information
6

Use care when lifting and carrying the product. This product is provided with a handle or handles for lifting and carrying.
Use only the Tektronix rackmount hardware specified for this product.
Probes and test leads
Before connecting probes or test leads, connect the power cord from the power connector to a properly grounded power outlet.
Keep fingers behind the protective barrier, protective finger guard, or tactile indicator on the probes. Remove all probes, test leads and
accessories that are not in use.
Use only correct Measurement Category (CAT), voltage, temperature, altitude, and amperage rated probes, test leads, and adapters for
any measurement.
Beware of high voltages
Understand the voltage ratings for the probe you are using and do not exceed those ratings. Two ratings are important to know and
understand:
• The maximum measurement voltage from the probe tip to the probe reference lead.
• The maximum floating voltage from the probe reference lead to earth ground.
These two voltage ratings depend on the probe and your application. Refer to the Specifications section of the manual for more
information.
WARNING: To prevent electrical shock, do not exceed the maximum measurement or maximum floating voltage for the
oscilloscope input BNC connector, probe tip, or probe reference lead.
Connect and disconnect properly.
Connect the probe output to the measurement product before connecting the probe to the circuit under test. Connect the probe reference
lead to the circuit under test before connecting the probe input. Disconnect the probe input and the probe reference lead from the circuit
under test before disconnecting the probe from the measurement product.
De-energize the circuit under test before connecting or disconnecting the current probe.
Connect the probe reference lead to earth ground only.
Do not connect a current probe to any wire that carries voltages or frequencies above the current probe voltage rating.
Inspect the probe and accessories
Before each use, inspect probe and accessories for damage (cuts, tears, or defects in the probe body, accessories, or cable jacket). Do
not use if damaged.
Ground-referenced oscilloscope use
Do not float the reference lead of this probe when using with ground-referenced oscilloscopes. The reference lead must be connected to
earth potential (0 V).
Floating measurement use
Do not float the reference lead of this probe above the rated float voltage.
Important safety information
5 Series B Mixed Signal Oscilloscope Service Manual MSO54B, MSO56B, MSO58B 7

Service safety summary
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 unless another person capable of rendering first aid and resuscitation is
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.
Terms in this manual
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.
Terms on the product
These terms may appear on the product:
•DANGER indicates an injury hazard immediately accessible as you read the marking.
• WARNING indicates an injury hazard not immediately accessible as you read the marking.
• CAUTION indicates a hazard to property including the product.
Important safety information
8

Symbols on the product
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 be taken to avoid them. (This symbol may also be used to refer the user to
ratings in the manual.)
The following symbols(s) may appear on the product.
CAUTION: Refer to
Manual
Protective Ground
(Earth) Terminal
Earth Terminal Chassis Ground WARNING: High
Voltage
Standby
Important safety information
5 Series B Mixed Signal Oscilloscope Service Manual MSO54B, MSO56B, MSO58B 9

Preface
This manual contains service information for your instrument.
Read the General and Service safety summaries before servicing the product.
Be sure to read the introductions to all procedures. These introductions provide important information needed to perform the service
correctly, safely, and efficiently.
Supported products
This manual contains information that is necessary to service the following products:
• MSO54B
• MSO56B
• MSO58B
Check for a specific product designation in the header at the top of the page, in a heading, table or figure title, or within text. Material that
does not have any specific product designation applies to all products in the manual.
Replaceable parts
This manual refers to any field-replaceable assembly or mechanical part specifically by its name or generically as a replaceable part.
In general, a replaceable part is any circuit board or assembly (such as the hard disk drive) or a mechanical part (such as the I/O port
connectors) that is listed in the replaceable parts list that can be replaced in the field.(See Replaceable parts list).
Where to find operating information
For information on installing, operating, and networking the instrument, refer to the online help or user manual that was provided with your
oscilloscope. You can also find the manual at www.tek.com/manuals, by searching for your product.
Preface
10

Theory of operation
This chapter describes the electrical operation of the oscilloscope to the module level. The block diagram shows the oscilloscope module
interconnections.
Figure 1: Block diagram
Power supply
The Power Supply board converts AC line voltage to +12 V to power for all internal circuits.
Theory of operation
5 Series B Mixed Signal Oscilloscope Service Manual MSO54B, MSO56B, MSO58B 11

Carrier interface assembly
The Carrier interface assembly contains the following functions:
Processor system The processor system contains a microprocessor that controls the entire instrument. The processor system
also contains the solid state drive for the operating system, system RAM, and interfaces to I/O ports and the
acquisition system.
Rear panel I/O ports The Carrier interface assembly contains USB ports, an Ethernet port (LAN), a VGA Video port, a DVI Video
port, a DisplayPort Video port, the USB-TMC port, an AUX OUT BNC connector, an EXT REF IN BNC
connector, and the AFG Out generator BNC connector.
Power converter The Carrier interface assembly converts the +12 V power to all voltages used for the analog and digital
circuitry throughout the system. Standby power is used to keep portions of the Carrier interface assembly
and Main board powered at all times that AC power is connected to the instrument.
Other functions The Carrier interface assembly also houses the AFG generator, USB-TMC controller and interfaces to the
Power supply and various cooling fans. The Carrier interface assembly also provides the interface to the
optional Windows drive.
Main board and front-end board
The Main and Analog boards contain the following functions:
Acquisition system The Acquisition system begins with the analog signal path and ends with a digitized signal in memory. The
signal enters a channel input, and then passes through an attenuator and preamplifier. The analog signal
from each preamplifier goes through a digitizer, and then into acquisition memory. The analog signal from
each preamplifier is also distributed to a trigger circuit.
Front-end All of the analog and digital inputs are routed to the Front-end board. The analog channels are amplified
and attenuated through the front-end circuitry, and are output to the Main board. The digital channels simply
pass through the front-end board to the Main board. The front-end board has a controller that is used as an
I/O controller for the front-end board.
Power converter The Main board converts the +12 V power to some of the other voltages used for the analog and digital
circuitry throughout the system. This is in addition to the power conversion provided by the Processor
assembly.
Front panel and display
The Front Panel board contains digital logic that reads the front-panel buttons and controls and sends this information to the processor
system on the Processor assembly. The Front Panel board also generates the probe compensation output signal, provides USB ports
on the front panel and houses the main power switch. The front panel routes the digital front-end signals from the probe directly to the
front-end board. The front panel also provides the video interface to the internal HD display.
Theory of operation
12

Adjustment procedures
Adjustment and calibration can be performed only by a Tektronix Service Center. See Contacting Tektronix, following the title page in this
manual, for information on contacting Tektronix Service Support.
Adjustment interval
The voltage and timing references inside the instrument are very stable over time and do not need routine adjustment.
If the instrument fails the performance tests in the Specifications and Performance Verification manual, adjustment may be required.
To download the 5 Series B MSO Specification and Performance Verification manual (Tektronix part number 077-1725-XX), go to
www.tek.com/product-support, enter the manual part number (with no dashes) in the field, click GO, and then select the Specification and
Performance Verification document to download.
If your organization requires periodic calibration, a general rule is to verify performance and make adjustments (only if needed) every
2000 hours of operation or once a year if the instrument is used infrequently.
Adjustment after repair
After removal and replacement of any module, you must perform the Performance Verification procedures, found in the Specifications and
Performance Verification manual (Tektronix part number 077-1725-XX), available to download from the Tektronix web site (www.tek.com/
product-support).
If the instrument fails any Performance Verification tests, it must be returned to a Tektronix Service Center for adjustment and calibration.
Adjustment procedures
5 Series B Mixed Signal Oscilloscope Service Manual MSO54B, MSO56B, MSO58B 13

Maintenance
Information for periodic and corrective maintenance on the instrument.
Preventing ESD
Before servicing this product, read the General Safety Summary and the Service Safety Summary at the front of the manual, as well as the
following ESD information.
CAUTION: Electrostatic discharge (ESD) can damage any semiconductor component in this instrument.
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:
1. Minimize handling of static-sensitive circuit boards and components.
2. Transport and store static-sensitive modules in their static protected containers or on a metal rail. Label any package that contains
static-sensitive boards.
3. Discharge the static voltage from your body by wearing a grounded antistatic wrist strap while handling these modules.
4. Service static-sensitive modules only at a static-free work station.
5. Do not allow any items capable of generating or holding a static charge on the work station surface.
6. Handle circuit boards by the edges when possible.
7. Do not slide the circuit boards over any surface.
8. Avoid handling circuit boards in areas that have a floor or work-surface covering capable of generating a static charge.
Inspection and cleaning
Inspection and Cleaning 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 prevent
instrument malfunction and enhance its reliability.
Preventive maintenance consists of visually inspecting and cleaning the instrument and using general care when operating it.
How often to perform maintenance depends on the severity of the environment in which the instrument is used. A proper time to perform
preventive maintenance is just before instrument adjustment.
Exterior cleaning (other than display)
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 cleaning towel dampened with deionized water. Do not spray or wet the switch itself.
CAUTION: Avoid the use of chemical cleaning agents which might damage the plastics used in this instrument. Use only
deionized water when cleaning the front-panel buttons. Use a 75% isopropyl alcohol solution as a cleaner for cabinet parts. Before
using any other type of cleaner, consult your Tektronix Service Center or representative.
Inspection - Exterior. Inspect the outside of the instrument for damage, wear, and missing parts. Immediately repair defects that could
cause personal injury or lead to further damage to the instrument.
Maintenance
14

Table 1: External inspection checklist
Item Inspect for Repair action
Cabinet, front panel, and cover Cracks, scratches, deformations, damaged
hardware
Repair or replace defective module
Front-panel knobs Missing, damaged, or loose knobs Repair or replace missing or defective knobs
Connectors Broken shells, cracked insulation, and
deformed contacts. Dirt in connectors
Repair or replace defective modules. Clear
or brush out dirt
Carrying handle and cabinet feet Correct operation Repair or replace defective module
Accessories Missing items or parts of items, bent pins,
broken or frayed cables, and damaged
connectors
Repair or replace damaged or missing items,
frayed cables, and defective modules
Flat panel display cleaning
Clean the flat panel display surface by gently rubbing the display with a clean-room wipe (such as Wypall Medium Duty Wipes, #05701,
available from Kimberly-Clark Corporation), or an abrasive-free cleaning cloth.
If the display is very dirty, moisten the wipeor cloth with distilled water, a 75% isopropyl alcohol solution, or standard glass cleaner, and
gently rub the display surface. Use only enough liquid to dampen the cloth or wipe. Avoid using excess force or you may damage the
display surface.
CAUTION: Improper cleaning agents or methods can damage the flat panel display.
• Do not use abrasive cleaners or surface cleaners to clean the display.
• Do not spray liquids directly on the display surface.
• Do not scrub the display with excessive force.
CAUTION: To prevent getting moisture inside the instrument during external cleaning, do not spray any cleaning solutions directly
onto the screen or instrument.
Interior cleaning
You can only clean the interior of the rear chassis assembly. To access the rear chassis assembly, see the Removal and Installation
Procedures topics.
Do not disassemble or clean the front chassis assembly (other than cleaning the front panel display and removing panel knobs).
Disassembling the front chassis assembly requires that the instrument be returned to your nearest Tektronix Service Center for calibration.
WARNING: To avoid electric shock or damage to the instrument, remove instrument power. Before performing any procedure that
follows, power down the instrument and disconnect it from line voltage.
• Blow off dust with dry, low-pressure (approximately 9 psi), deionized air.
•Use a soft-bristle, non-static-producing brush for cleaning around components.
• Remove any remaining dust with a lint-free cloth dampened in isopropyl alcohol (75% solution). (A cotton-tipped applicator is useful for
cleaning in narrow spaces and on circuit boards).
• If you must use a liquid for minor rear chassis interior cleaning, use a clean-room wipe (such as Wypall Medium Duty Wipes, #05701,
available from Kimberly-Clark Corporation) dampened with a 75% isopropyl alcohol solution.
• Inspect the internal portions of the instrument for damage and wear. See Table 2 on page 16. Defects should be repaired immediately.
• If any circuit board is repaired or replaced, you must perform the Performance Verification procedure in the specifications and
performance verification manual, which was provided with your instrument. This manual is also available at www.tektronix.com/
Maintenance
5 Series B Mixed Signal Oscilloscope Service Manual MSO54B, MSO56B, MSO58B 15

manuals, by searching for your product name. If the instrument fails the Performance Verification tests, it must be returned to a
Tektronix Service Center for repair and calibration.
CAUTION: To prevent damage from electrical arcing, ensure that circuit boards and components are dry before applying power to
the instrument.
Table 2: Internal inspection checklist
Item Inspect for Repair action
Circuit boards Loose, broken, or corroded solder
connections. Burned circuit boards. Burned,
broken, or cracked circuit-run plating.
Remove and replace damaged circuit board.
Resistors Burned, cracked, broken, blistered condition.
Capacitors Damaged or leaking cases. Corroded solder
on leads or terminals.
Wiring and cables Loose plugs or connectors. Burned, broken,
or frayed wiring.
Firmly seat connectors. Replace defective
cables.
Chassis Dents, deformations, and damaged
hardware.
Straighten, repair, or replace defective
hardware.
Lubrication
There is no periodic lubrication required for this instrument.
Returning the instrument for service
If the instrument has removable batteries, remove the batteries before repacking the instrument and do not include the batteries in the
shipment.
Note: Do not ship removable batteries to Tektronix Service Centers.
When repacking the instrument for shipment, use the original packaging. If the packaging is unavailable or unfit for use, contact your local
Tektronix representative to obtain new packaging.
Seal the shipping carton with an industrial stapler or strapping tape.
Before returning the instrument for service, contact the Service Center to get an RMA (return material authorization) number, and any
return or shipping information you may need.
If the instrument is being shipped to a Tektronix Service Center, enclose the following information:
• The RMA number.
• The owner's address.
• Name and phone number of a contact person.
• Type and serial number of the instrument.
• Reason for returning.
• A complete description of the required service.
Mark the address of the Tektronix Service Center and the return address on the shipping carton in two prominent locations.
Maintenance
16

Removal and replace procedures
This section contains procedures for removal and installation of replaceable modules in the instrument. Refer to Replaceable Parts List for
lists and exploded views of replaceable modules.
Any module inside of the chassis that does not have a remove and replace procedure requires that the entire instrument be returned to
Tektronix Service Center for service.
WARNING: Before performing this or any other procedure in this manual, read the safety summaries found at the beginning
of this manual. Also, to prevent possible injury to service personnel or damage to the instrument components, read Preventing
ESD on page 14.
Before performing any procedure in this subsection, disconnect the power cord from the line voltage source. Failure to do so could
cause serious injury or death.
Note: Read the cleaning procedure before disassembling the instrument for cleaning.
Required equipment
Most assemblies in this instrument can be removed with a T-10 or T8 Torx® screwdriver tip.
Table 3: Required equipment for removal and replacement
Item No. Name Description
1 Screwdriver handle Accepts Torx-driver bits
2 T-10 Torx tip Used for removing instrument screws. Torx-driver bit for T-10 size
screw heads
3 T-8 Torx tip Used for removing instrument screws. Torx-driver bit for T-8 size
screw heads
4 3/16 inch open-end wrench Used to remove nut posts
5 Proper antistatic work environment To prevent electrostatic damage to components whenever you work
on the instrument, wear properly-grounded electrostatic prevention
wrist and foot straps, and work in a tested antistatic environment on
an antistatic mat.
Remove front-panel knobs
Use this procedure to remove and replace front-panel knob assemblies.
Before you begin
•To prevent electrostatic damage to components whenever you work on the instrument, wear properly-grounded electrostatic prevention
wrist and foot straps, and work in a tested antistatic environment on an antistatic mat.
About this task
There are eight knob assemblies that can be removed from the front case.
Procedure
1. To remove a knob assembly, pull the knob straight out of the front panel. Finger strength is adequate to pull knobs. Do not use pliers.
Maintenance
5 Series B Mixed Signal Oscilloscope Service Manual MSO54B, MSO56B, MSO58B 17

2. To reinstall a knob, align the knob with the shaft indent and press the knob onto the shaft. Turn the knob to make sure there is a
smooth rotation.
Remove SATA riser board assembly
Use this procedure to remove and replace the external hard drive SATA riser board assembly.
Before you begin
• To prevent electrostatic damage to components whenever you work on the instrument, wear properly-grounded electrostatic prevention
wrist and foot straps, and work in a tested antistatic environment on an antistatic mat.
About this task
See figure Front chassis. Remove the external hard drive SATA riser bracket and board from the chassis using the following steps:
Procedure
1. Set instrument on its back, with the bottom facing you.
2. Open and remove the hard drive door from the bottom of the instrument.
3. Remove the three T-10 Torx screws securing the SATA riser board bracket assembly to the chassis.
4. Remove the SATA riser board bracket assembly from bottom of chassis.
5. To remove the SATA riser board, remove the two T-10 Torx screws securing the SATA riser board to the riser bracket.
6. To reinstall, reverse the steps. Tighten the T-10 Torx screws to 0.65 N·m.
Remove feet
Use this procedure to remove and replace bottom feet assemblies or gain access to the rear chassis assembly.
Before you begin
• To prevent electrostatic damage to components whenever you work on the instrument, wear properly-grounded electrostatic prevention
wrist and foot straps, and work in a tested antistatic environment on an antistatic mat.
About this task
Remove the two flip feet assemblies from the rear chassis using the following steps.
Procedure
1. Remove all cables and the power cord from the rear panel.
2. Set the instrument on its back side so the bottom is facing you.
3. Flip open both feet assemblies.
4. Use a screwdriver with T-10 Torx tip to remove the four screws from each foot assembly.
5. Remove the feet assembles.
6. To reinstall, reverse the steps. Use a screwdriver with T-10 Torx tip to secure the eight screws. First insert and tighten the screws that
are near the front edge of the instrument, then insert and tighten the screws that are near the rear edge of the instrument. Tighten to
0.65 N·m.
Maintenance
18

Remove handle
Use this procedure to remove and replace the handle assemblies.
Before you begin
•To prevent electrostatic damage to components whenever you work on the instrument, wear properly-grounded electrostatic prevention
wrist and foot straps, and work in a tested antistatic environment on an antistatic mat.
About this task
Remove the handle assemblies (table 6, index #13) using the following steps.
Procedure
1. Use a screwdriver with T-10 Torx tip to remove two screws (table 6, index #18) from each side of the handle.
2. Disengage the handle from the pins on the couplers (table 6, index #17) and remove the handle.
3. Remove the two couplers.
4. To reinstall, reverse the steps. Use a screwdriver with T-10 Torx tip to secure the screws. Tighten to 0.65 N·m.
Remove rear grill and case
Use this procedure to remove and replace the rear grill and rear case.
Before you begin
• To prevent electrostatic damage to components whenever you work on the instrument, wear properly-grounded electrostatic prevention
wrist and foot straps, and work in a tested antistatic environment on an antistatic mat.
•Remove handle on page 19.
•Remove feet on page 18.
About this task
Remove the grill (table 6, index #14) and rear case (table 6, index #10) using the following steps:
Procedure
1. Use a screwdriver with T-8 Torx tip to remove the six screws securing the grill to the rear case (table 6, index #15) .
2. Put fingers in handle hub holes on each side of the grill and pull the grill off of the rear case.
3. Use a screwdriver with T-10 Torx tip to remove the six screws securing the rear case to the rear chassis (table 6, index #9) .
4. Slide the rear case off of the rear chassis.
5. To reinstall, reverse the steps. Tighten the six T-10 Torx rear case screws to 0.65 N·m. Tighten the six T-8 Torx rear grill screws to 0.45
N·m.
Maintenance
5 Series B Mixed Signal Oscilloscope Service Manual MSO54B, MSO56B, MSO58B 19

Remove rear chassis assembly
Use this procedure to remove and replace the rear chassis, to access rear chassis assemblies (power supply, main fan, Carrier interface
assembly, AFG Riser board).
Before you begin
• To prevent electrostatic damage to components whenever you work on the instrument, wear properly-grounded electrostatic prevention
wrist and foot straps, and work in a tested antistatic environment on an antistatic mat.
•Remove rear grill and case on page 19
About this task
Remove the rear chassis assembly from the front chassis assembly using the following steps.
Procedure
1. Use a screwdriver with a with T-10 Torx tip to remove the 19 screws securing the rear chassis to the front chassis. There are five
screws each along the top and bottom, and four screws on each side.
2. Insert a large flat blade screwdriver no more than 1/4 inch into a rectangular slot on the corner of the rear chassis (see following
image). Rotate the screwdriver to lift the corner of the rear chassis from the front chassis. Repeat on each corner. There may be a little
resistance from the front right corner of the bottom edge, where the rear chassis interconnects to the front chassis.
3. Lift the rear chassis off of the front chassis.
4. To reinstall, reverse the steps:
a) Align the rear chassis assembly with the front chassis, slide in, and push gently to seat the connectors.
b) Use a screwdriver with T-10 Torx tip to install the 18 chassis screws securing the rear chassis to the front chassis. Tighten to 0.65
N·m.
Maintenance
20