Tektronix MSO44, MSO46 Service Manual
4 Series MSO
(MSO44, MSO46)
Service
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ektronix products are covered by U.S. and foreign patents, issued
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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 www.tek.com to find contacts in your area.
ektronix, Inc.
Table of Contents
Table of Contents
List of Figures................................................................................................................................................................................5
List of Tables................................................................................................................................................................................. 6
Important safety information..........................................................................................................................................................7
General safety summary........................................................................................................................................................7
Service safety summary.........................................................................................................................................................9
Terms in the manual.............................................................................................................................................................10
Terms on the product........................................................................................................................................................... 10
Symbols on the product....................................................................................................................................................... 10
Preface........................................................................................................................................................................................ 11
Supported products..............................................................................................................................................................11
Replaceable parts................................................................................................................................................................ 11
Where to find operating information..................................................................................................................................... 11
Theory of operation..................................................................................................................................................................... 12
Power supply....................................................................................................................................................................... 12
Processor board...................................................................................................................................................................12
Main board........................................................................................................................................................................... 12
Front panel and display........................................................................................................................................................13
Adjustment procedures............................................................................................................................................................... 14
Adjustment........................................................................................................................................................................... 14
Adjustment interval.............................................................................................................................................................. 14
Adjustment after repair.........................................................................................................................................................14
Maintenance................................................................................................................................................................................15
Preventing ESD................................................................................................................................................................... 15
Inspection and cleaning....................................................................................................................................................... 15
Exterior cleaning (other than dissplay)..........................................................................................................................15
Flat panel display cleaning........................................................................................................................................... 16
Interior cleaning............................................................................................................................................................ 16
Lubrication.................................................................................................................................................................... 17
Returning the instrument for service.............................................................................................................................17
Removal and replacement procedures................................................................................................................................ 17
Required equipment..................................................................................................................................................... 18
Removal/Replacement procedures...............................................................................................................................18
Troubleshooting................................................................................................................................................................... 30
Service level................................................................................................................................................................. 30
Check for common problems........................................................................................................................................30
Equipment required...................................................................................................................................................... 30
Troubleshooting flow chart............................................................................................................................................30
Instrument self tests......................................................................................................................................................31
Software updates..........................................................................................................................................................32
After repair.................................................................................................................................................................... 32
Replaceable parts....................................................................................................................................................................... 33
Parts ordering information....................................................................................................................................................33
Module servicing.................................................................................................................................................................. 33
Abbreviations....................................................................................................................................................................... 33
4 Series MSO (MSO44, MSO46) Service 3
Table of Contents
Using the replaceable parts list............................................................................................................................................33
Rear case assembly with handle and feet........................................................................................................................... 34
Front assembly
.................................................................................................................................................................... 36
Rear chassis assembly with power supply and fans............................................................................................................38
Front assembly (Backside).................................................................................................................................................. 40
Front chassis assembly with acqusition board and processor board...................................................................................42
4 Series MSO (MSO44, MSO46) Service 4
List of Figures
List of Figures
Figure 1: 4 Series MSO block diagram....................................................................................................................................... 12
Figure 2: Primary troubleshooting tree........................................................................................................................................31
Figure 3: Rear case assembly with handle and feet exploded view........................................................................................... 34
Figure 4: Front assembly exploded view.....................................................................................................................................36
Figure 5: Rear chassis assembly with power supply and fans - exploded view..........................................................................38
Figure 6: Front assembly (Backside) exploded view...................................................................................................................40
Figure 7: Front chassis assembly with acqusition board and processor board- exploded view..................................................42
4 Series MSO (MSO44, MSO46) Service 5
List of Tables
List of Tables
Table 1: External inspection checklist......................................................................................................................................... 16
Table 2: Internal inspection checklist...........................................................................................................................................17
Table 3: Required equipment for removal and replacement....................................................................................................... 18
Table 4: Failure symptoms and possible causes.........................................................................................................................30
Table 5: Parts list column descriptions........................................................................................................................................ 33
Table 6: Rear case...................................................................................................................................................................... 35
Table 7: Front assembly.............................................................................................................................................................. 37
Table 8: Rear chassis assembly with power supply and fans..................................................................................................... 39
Table 9: Front assembly (Backside)............................................................................................................................................ 41
Table 10: Front chassis assembly with acqusition board and processor board ......................................................................... 42
4 Series MSO (MSO44, MSO46) Service 6
Important safety information
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.
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.
Use proper voltage setting Before applying power, ensure that the line selector is in the proper position for the source
being used.
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.
Ground the product This product is indirectly grounded through the grounding conductor of the mainframe power
cord. T
o 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 switch disconnects the product from the power source. See instructions for the
location. Do not position the equipment so that it is difficult to disconnect the power switch; it
must remain accessible to the user at all times to allow for quick disconnection if needed.
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.
Use proper AC adapter Use only the AC adapter specified for this product.
Connect and disconnect properly Do not connect or disconnect probes or test leads while they are connected to a voltage
source.
4 Series MSO (MSO44, MSO46) Service 7
Important safety information
Use only insulated voltage probes, test leads, and adapters supplied with the product, or
indicated by T
ektronix to be suitable for the product.
Observe all terminal ratings T
Observe all terminal ratings To avoid fire or shock hazard, observe all rating and markings on the product. Consult the
Do not operate without covers Do not operate this product with covers or panels removed, or with the case open. Hazardous
Avoid exposed circuitry Do not touch exposed connections and components when power is present.
Do not operate with suspected
failures
Replace batteries properly Replace batteries only with the specified type and rating.
Recharge batteries properly Recharge batteries for the recommended charge cycle only.
Use proper fuse Use only the fuse type and rating specified 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
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
Provide a safe working environment Always place the product in a location convenient for viewing the display and indicators.
o 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.
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 of that terminal.
Do not float the common terminal above the rated voltage for that terminal.
The measurement terminals on this product are not rated for connection to mains or Category
II, III, or IV circuits.
voltage exposure is possible.
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.
Be aware that condensation may occur if a unit is moved from a cold to a warm environment.
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.
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.
4 Series MSO (MSO44, MSO46) Service 8
Important safety information
Use care when lifting and carrying the product. This product is provided with a handle or
handles for lifting and carrying.
Warning: The product is heavy. T
device get help when lifting or carrying the product.
Warning: The product is heavy. Use a two-person lift or a mechanical aid.
Use only the T
ektronix rackmount hardware specified for this product.
o reduce the risk of personal injury or damage to the
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 (CA
any measurement.
Beware of high voltages Understand the voltage ratings for the probe you are using and do not exceed those ratings.
T), voltage, temperature, altitude, and amperage rated probes, test leads, and adapters for
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.
Connect and disconnect properly 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.
.
Risk assessment warnings and information
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.
4 Series MSO (MSO44, MSO46) Service 9
Important safety information
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 poweronDangerous 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 the 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.
T
erms 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.
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 may appear on the product:
4 Series MSO (MSO44, MSO46) Service 10
Preface
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:
• MSO44
• MSO46
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.)
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.
4 Series MSO (MSO44, MSO46) Service 1
1
Theory of operation
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: 4 Series MSO block diagram
Power supply
The Power Supply board converts AC line voltage to +12 V to power for all internal circuits.
Processor board
The processor board contains the following functions:
Processor system The processor system contains a microprocessor that controls the entire instrument. The
processor system also contains the flash memory for the operating system, system RAM, and
interfaces to I/O ports and the acquisition system.
Rear panel I/O ports The processor board contains USB ports, an Ethernet port (LAN), a HDMI Video port, the
USB-TMC port, an AUX OUT BNC connector, an EXT REF IN BNC connector
Out generator BNC connector.
Other functions The processor board also houses the AFG generator, USB-TMC controller and USB host hub.
, and the AFG
Main board
The Main board contain the following functions:
4 Series MSO (MSO44, MSO46) Service 12
Theory of operation
Acquisition system The Acquisition system begins with the analog signal path and ends with a digitized signal
in memory
preamplifier
acquisition memory. The analog signal from each preamplifier is also distributed to a trigger
circuit.
Analog Front-end All of the analog and digital inputs are routed to the analog Front-end circuitry. The analog
channels are amplified and attenuated through the front-end circuitry, and are output to the
acquisition ASICs. The digital channels simply pass through the front-end circuitry to the
acquisition ASICs.
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
system powered at all times that AC power is connected to the instrument.
Other functions The Main board interfaces to the Power supply and various cooling fans.
. The signal enters a channel input, and then passes through an attenuator and
. The analog signal from each preamplifier goes through a digitizer, and then into
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 board. 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 main
board.
4 Series MSO (MSO44, MSO46) Service 13
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