Tektronix MDO3000 Series User manual

xx
MDO3000 Series
Mixed Domain Oscilloscopes
ZZZ
Service Manual
*P077098100*
077-0981-00

MDO3000 Series
Mixed Domain Oscilloscopes
ZZZ
Service Manual
xx
Revision A
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.
www.tek.com
077-0981-00

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 50 0
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.

Table of Contents
Important Safety Information .................................................................................... iv
General Safety Summary .................................................................................... iv
Service Safety Summary.................................................................................... vii
Terms in This Manual....................................................................................... viii
Symbols and Terms on the Product........................................................................ viii
Preface .............................................................................................................. ix
Manual Conventions.......................................................................................... ix
Where to Find Operating Information............................................................................ 1
Theory of Operation................................................................................................ 3
Power Supply................................................................................................... 3
I/O Board ....................................................................................................... 3
Main Board, Mezzanine Board, and Analog Board........................................................ 3
Front-Panel Board ............................................................................................. 4
Adjustments......................................................................................................... 7
Maintenance......................................................................................................... 9
Preventing ESD................................................................................................ 9
Inspection and Cleaning....................................................................................... 9
Module Removal.............................................................................................. 13
Troubleshooting............................................................................................... 15
Troubleshooting Procedure .................................................................................. 15
Unpacking and Repacking Instructions .................................................................... 19
Replaceable Parts List............................................................................................. 21
Parts Ordering Information .................................................................................. 21
Using the Replaceable Parts List............................................................................ 23
MDO3000 Series Mixed Domain Oscilloscopes Service Manual i

Table of Contents
List of Figures
Figure 1: MDO3000 Series block diagram...................................................................... 5
Figure 2: Removing tabs from the front protective cover..................................................... 13
Figure 3: Module locator ......................................................................................... 14
Figure 4: Primary troubleshooting procedure .................................................................. 16
Figure 5: AC power supply troubleshooting procedure....................................................... 17
Figure 6: Module isolation troubleshooting procedure........................................................ 18
Figure 7: Exploded view, front panel assembly................................................................ 26
Figure 8: Display, analog board, and main board assembly .................................................. 28
Figure 9: Rear chassis and connecting modules ............................................................... 30
ii MDO3000 Series Mixed Domain Oscilloscopes Service Manual

Table of Contents
List of Tables
Table 1: External inspection checklist........................................................................... 11
Table 2: Internal inspection checklist ........................................................................... 12
Table 3: Parts list column descriptions.......................................................................... 23
Table 4: Front panel assembly ................................................................................... 24
Table 5: Display, analog board, and main board............................................................... 27
Table 6: Rear chassis and connecting modules ................................................................ 29
MDO3000 Series Mixed Domain Oscilloscopes Service Manual iii

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, additional information is provided at
the end of this section. (See page vii, Service 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.
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.
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. 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.
iv MDO3000 Series Mixed Domain Oscilloscopes Service Manual

Important Safety Information
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.
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 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.
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.
Useonlyspecified replacement parts.
Use proper fuse. Use only the fuse type and rating specified for this product.
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.
MDO3000 Series Mixed Domain Oscilloscopes Service Manual v

Important Safety Information
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.
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 finger guards 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
vi MDO3000 Series Mixed Domain Oscilloscopes Service Manual