xx
MDO4000C Series
ZZZ
Mixed Domain Oscilloscopes
Service Manual
*P077117902*
077-1179-02
xx
MDO4000C Series
ZZZ
Mixed Domain Oscilloscopes
Service Manual
Warning
The servicing instructions ar
only. To avoid personal injury, do not perform any servicing
unless you are qualified to do s
prior to performing service.
e for use by qualified personnel
o. Refer to all safety summaries
www.tek.com
077-1179-02
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 . Bo x 500
Beaverto
USA
For product information, sales, service, and technical support:
n, OR 97077
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............ ................................ .................................. ........ vi
Terms in thi
Symbols and terms on the product......................................................................... vii
Preface .............................................................................................................. ix
Manual conventions ................ ................................ ................................ .......... ix
Operating Information ............................................................................................. 1
Theory of Operation. ................................ ................................ ............................... 3
Power su
I/O board........................................................................................................ 3
Main board and analog board................................................................................. 3
Front-panel board .............................................................................................. 4
Adjustments ......................................................................................................... 7
Maintenance......................................................................................................... 9
enting ESD ................................................................................................ 9
Prev
Inspection and cleaning .............. ................................ ................................ ......... 9
Module removal............................................................................................... 13
Troubleshooting....................... ................................ ................................ ........ 15
Troubleshooting procedure .................................................................................. 15
Unpacking and repacking instructions ..................................................................... 19
placeable Parts List....................... ................................ ................................ ...... 21
Re
Parts ordering information................................................................................... 21
Using the replaceable parts list.............................................................................. 22
s manual ......................... ................................ ............................... vii
pply .................... ................................ ................................ ............... 3
MDO4000C Series Mixed Domain Oscilloscopes Service Manual i
Table of Contents
List of Figure
Figure 1: MDO4000C block diagram......... ................................ ................................ ... 5
Figure 2: Re
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: Front panel assembly, non-SA models................... .................................. .......... 24
Figure 8:
Figure 9: Display, analog, and main board assemblies, non-SA models .......................... .......... 28
Figure 10: Display, analog, and main board assemblies, SA models .................................. ...... 30
Figure 11: Rear chassis, all models...................................... ................................ ........ 32
Figure 12: Front and back case .......................... ................................ ........................ 33
Figure 13: Rear chassis, showing cables and connectors ... .................................. ................ 34
e 14: Main board, showing cable and connectors ....................................................... 35
Figur
moving tabs from the front protective cover..................................................... 13
Front panel assembly, SA models.......... ................................ .......................... 26
s
ii MDO4000C Series Mixed Domain Oscilloscopes Service Manual
List of Tables
Table 1: External inspection checklist................. ................................ .......................... 11
Table 2: Int
Table 3: Parts list column descriptions...................... ................................ .................... 22
Table 4: Front panel assembly, non-SA models................................................................ 23
Table 5: Front panel assembly, SA models..................................................................... 25
Table 6: Display, analog, and main board assemblies, non-SA models ..................................... 27
Table 7: Display, analog, and main board assemblies, SA models........................................... 29
Table 8: R
Table 9: Front and back case ... ................................ .................................. ................ 33
Table 10: Cable and connectors, rear chassis..................... .................................. ............ 34
Table 11: Cable and connectors, main board ................................................................... 35
ernal inspection checklist ....... .................................. ................................ .. 12
ear chassis, all models ................ ................................ ................................ 31
Table of Contents
MDO4000C Series Mixed Domain Oscilloscopes Service Manual iii
Important safety information
Important saf
ety information
This manual c
for safe operation and to keep the product in a safe condition.
To safely pe
the end of this section. (See page vi, Servicesafetysummary.)
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.
ontains information and warnings that must be followed by the user
rform service on this product, additional information is provided at
To avoid fire or personal
jury
in
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.
personal protective equipment to prevent shock and arc blast injury where
Use
hazardous live conductors are exposed.
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
f the power cord. To avoid electric shock, the grounding conductor must be
o
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.
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.
iv MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Important safety information
Connect and dis
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 avoi d 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 transm
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.
connect properly. Do not connect or disconnect probes or test
itted to the
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 d amaged
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 m echanical
damage and replace when damaged. Do not use probes or test leads if t hey 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.
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.
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry. Remove the input signals before you clean
the product.
MDO4000C Series Mixed Domain Oscilloscopes Service Manual v
Important safety information
Probes and test leads
Provide proper
details on installing the product so it has proper ventilation.
Slots and open
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.
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
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.
ventilation. Refer to the installation instructions in the manual for
ings are provided for ventilation and should never be covered or
correct Measurement Category (CAT), voltage, temperature, altitude,
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 ele ctrical shock, do not exceed the maximum measurement
or
tip, or probe reference lead.
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 Servic e 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.
The maximum floating voltage from the probe reference lead to earth ground
maximum floating voltage for the oscilloscope input BNC connector, probe
vi MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Important safety information
Terms in this manual
Disconnect pow
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 b
Verify safety after repair. Always recheck ground continuity and mains dielectric
strength after performing a repair.
These t erms may appea r in this manual:
WAR N ING. 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.
er. To avoid electric shock, switch off the product power and
efore removing protective panels, soldering, or replacing components.
Symbols and terms o n the product
These terms may appear on the product:
GER indicates an injury hazard immediate ly accessible as you read
DAN
the marking.
NING indicates an injury hazard not immediately accessible as you
WAR
read the marking.
UTION indicates a hazard to property including the product.
CA
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
e taken to avoid them. (This symbol may also be used to refer the user to
b
ratings in the manual.)
The following symbol(s) may appear on the product:
MDO4000C Series Mixed Domain Oscilloscopes Service Manual vii
Important safety information
viii MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Preface
This service manual provides information that you need to troubleshoot,
disassemble, and replace parts on the following Tektronix oscilloscopes:
Manual conventions
Modules
Replaceable parts
Model Bandwidth
MDO4104C 1 GHz
MDO4054C
MDO4034C
MDO4024C
500 MHz 4
350 MHz 4
100 MHz 4
Channels RF frequency range
4
Option SA3:
Option SA6:
Option SA3:
Option SA6:
Option SA3:
Option SA6:
Option SA3:
Option SA6:
9kHz–3GHz
9kHz–6GHz
9kHz–3GHz
9kHz–6GHz
9kHz–3GHz
9kHz–6GHz
9kHz–3GHz
9kHz–6GHz
This manual uses certain conventions that you should become familiar with
before performing service.
ughout this manual, any replaceable component, assembly, or part is referred
Thro
to by the term module.
This manual refers to any field-replaceable assembly or mechanical part
cifically by its name or generically as a replace able part. In general, a
spe
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.
Safety
Symbols and terms related to safety appear in the General Safety Summary.
nformation for service procedures appears in both the General Safety Summary
I
and the Service Safety Summary.
MDO4000C Series Mixed Domain Oscilloscopes Service Manual ix
Preface
x MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Operating Information
For information on installing and operating your oscilloscope, refer to the
Tektronix MDO4000C Series Mixed Domain Oscilloscopes User Manual, which
was provided
with your oscilloscope. This manual is available in 11 languages.
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 1
Operating Information
2 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Theory of Operation
This chapter describes the electrical operation of the oscilloscope to the module
level. The block diagram shows the oscilloscope module interconnections. (See
Figure 1.)
Power supply
The Power S
internal circuits.
I/O board
The I/O board contains USB ports, an Ethernet port (LAN), a VGA Video port,
an AUX OUT BNC connector, an EXT REF IN BNC c onnector, and the AFG
generator output connector.
Main board and analog 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.
On units with options SA3 or SA6, the AUX IN trigger channel is replaced with
the RF measurement channel.
upply board converts AC line voltage to +12 V to power for all
All of the inputs (including RF if the unit contains options SA3 or SA6) are routed
to the Analog board. The analog channels are amplified and attenuated through
he front-end circuitry, and are output to the Main board. The RF channel is the
t
same except that the RF input signal is routed through an attenuator and a mixer
and down converted. The analog board has a controller that is used as an I/O
controller for the front-end (Analog board).
Trigger system
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 3
The Trigger system digitizes the analog signals from the preamplifiers and
routes the digitized signal to the Trigger ASIC. Advanced trigger functions are
enabled only when the appropriate application modules and supporting software
are installed.
Theory of Operation
Display system
Processor sys tem
Power converter
Front-panel board
The Display sys
menus and text, and stores this information in display memory. It then uses this
data to refresh the XGA display module (LCD).
The Processo
instrument. The processor system also contains FLASH ROM, system RAM, and
interfaces to USB ports and the Ethernet port.
The Main bo
and digital circuitry throughout the system. The +5 V standby power is used
to keep the F ront Panel powered up at all times that AC power is connected to
the unit.
The Front Panel board contains a microprocessor that reads the front-panel buttons
and controls, sends this information to the processor system on the Main board,
and controls power to the Main board. The Front Panel board also generates
obe compensation output signal, provides an interface to the a pplication
the pr
modules, and controls power to the Main board.
tem combines live waveform data from acquisition memory with
r system contains a microprocessor that controls the entire
ard converts the +12 V power to other voltages used for the analog
On mo
N-type connector for the RF input.
dels fitted options SA3 or SA6, the AUX IN BNC is replaced with an
4 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Theory of Operation
Figure 1: MDO4000C block diagram
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 5
Theory of Operation
6 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Adjustments
Please return the instrument to Tektronix if adjustment is required. There are
no adjustment procedures (calibrations) that can be performed by the customer.
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 p
To determine if adjustment is required, use the Performance Verification
procedure
and Performance Verification manual, available at www.tektronix.com/manuals.
Adjustment is also required after instrument repair.
erformance of the instrument.
in the MDO4000C Series Mixed Domain Oscilloscopes Specifications
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 7
Adjustments
8 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Maintenance
This section contains the information needed to do periodic and corrective
maintenance on the oscilloscope, as well as repackaging instructions for returning
the oscilloscope to Tektronix for service.
Preventing
ESD
Before servicing this product, read the General Safety Summary and the Service
Safety Summary at the front of the manual, and familiarize yourself with the
following
CAUTION. Static discharge can damage any semiconductor component in this
oscilloscope.
When per
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. Trans
3. Disc
4. Do not place anything capable of generating or holding a static charge on the
electrostatic discharge (ESD) information.
forming any service that requires internal access to the oscilloscope,
port and store static-sensitive modules in their static protected containers
or on a metal rail. Label any package that contains static-sensitive boards.
harge the static voltage from your body by wearing a grounded antistatic
wrist strap while handling these modules. Service static-sensitive modules
only at a static-free work station.
work station surface.
5. Handle circuit boards by the edges when possible.
6. Do
7. Avoid handling circuit boards in areas that have a floor or work-surface
not slide the circuit boards over any surface.
overing capable of generating a static charge.
c
Inspection and cleaning
Inspection and cleaning are done as preventive maintenance. Preventive
maintenance, when done regularly, may prevent oscilloscope malfunction and
enhance its reliability.
Preventive maintenance consists of visually inspecting and cleaning the
oscilloscope and using general care when operating it.
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 9
Maintenance
General care
Flat panel display cleaning
How often you do
which the oscilloscope is used. A proper time to perform preventive maintenance
is just before oscilloscope adjustment.
The cabinet h
place when operating the oscilloscope.
WARNING. To avoid injury, power off the instrument and disconnect it from line
voltage before performing any procedure that follows.
The display is a soft plastic display and must be treated with care during cleaning.
CAUTION.
display.
Avoid using abrasive cleaners or commercial glass cleaners to clean the display
surface.
Avoid spraying liquids directly on the display surface.
Avoid scrubbing the display with excessive force.
Improper cleaning agents or methods can damage the flat panel
maintenance depends on the severity of the environment in
elps keep dust out of the oscilloscope and should normally be in
Exterior cleaning
the flat panel display surface by gently rubbing the display with a
Clean
clean-room wipe (such as Wypall Medium Duty Wipes, #05701, available from
Kimberly-Clark Corporation).
If the display is very dirty, moisten the wipe with distilled water or a 75%
isopropyl alcohol solution and gently rub the display surface. Avoid using excess
force or you may damage the plastic display surface.
CAUTION. To prevent getting moisture inside the oscilloscope during external
eaning, use only enough liquid to dampen the cloth or applicator.
cl
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 might damage the
chassis.
10 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Maintenance
Clean the power
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 oscilloscope. Use only deionized water when cleaning the
menu buttons or front-panel buttons. Use a 75% isopropyl alcohol solution as a
cleaner and rinse with deionized water. Before using any other type of cleaner,
r Tektronix Service Center or representative.
following table as a guide. Immediately repair defects that could cause
Exterior inspection
consult you
Inspect the outside of the oscilloscope for damage, wear, and missing parts,
using the
personal injury or lead to further damage to the oscilloscope.
Table 1:
Item Inspect for Repair action
Cabinet, front panel, and cover Cracks, scratches, deformations, damaged
Front-panel knobs Missing, damaged, or loose knobs.
Conne
Carrying handle, and cabinet feet Correct operation. Repair or replace defective module.
Acce
External inspection checklist
ctors
ssories
hardware.
Broken shells, cracked insulation, and
med contacts. Dirt in connectors.
defor
Missing items or parts of items, bent pins,
broken or frayed cables, and damaged
nectors.
con
Repair or replace defective module.
Repair or replace missing or defective
.
knobs
r or replace defective modules. Clear
Repai
or wash out dirt.
ir or replace damaged or missing
Repa
items, frayed cables, and defective modules.
Interior inspection
access the inside of the oscilloscope for cleaning and inspection, refer to the
To
exploded view diagrams. (See page 21, Replaceable Parts List.)
nspect the internal portions of the oscilloscope for damage and wear, using the
I
following table as a guide. Repair any defects immediately.
If any circuit board is repaired or replaced, adjustment is required. (See page 7,
Adjustments.)
CAUTION. To prevent damage from electrical arcing, make sure that circuit
boards and components are dry before applying power to the oscilloscope.
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 11
Maintenance
Table 2: Intern
Item Inspect for Repair action
Circuit boards
Resistors Burned, cracked, broken, blistered condition. Remove and replace damaged circuit board.
Solder connections Cold solder or rosin joints.
Capacitors Damaged or leaking cases. Corroded solder
Wiring and cables Loose plugs or connectors. Burned, broken,
Chassis Dents, deformations, and damaged
al inspection checklist
Interior cleaning
Loose, broken
connections. Burned circuit boards. Burned,
broken, or cracked circuit-run plating.
on leads or terminals.
or frayed wiring.
hardware
1. Blow off
, or corroded solder
.
dust with dry, low-pressure, deionized air (approximately 9 psi).
Remove and rep
Resolder joi
alcohol.
Remove and r
Firmly seat connectors. Repair or replace
modules with defective wires or cables.
Straighten, repair, or replace defective
hardware
lace damaged circuit board.
nt and clean with isopropyl
eplace damaged circuit board.
.
2. Remove any remaining dust with a lint-free cloth dampened in isopropyl
l (75% solution) and rinsed with warm deionized water. (A
alcoho
cotton-tipped applicator is useful for cleaning in narrow spaces and on circuit
boards.)
Lubrication
NOTE. If, after performing steps 1 and 2, a module is clean upon inspection,
skip the following steps.
If there is still dust o r dirt on the module, the oscilloscope may be spray washed
using a solution of 75% isopropyl alcohol by following these steps:
a. Spray wash dirty parts with isopropyl alcohol and wait 60 seconds for the
majority of the alcohol to evaporate.
b. Use hot (120 °F to 140 °F) deionized water to thoroughly rinse them.
c. Dry all parts with low-pressure, deionized air.
ry all components and assemblies in an oven or drying compartment
d.D
using low-temperature (125 °F to 150 °F) circulating air.
There is no periodic lubrication required for this oscilloscope.
12 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Module removal
Maintenance
WAR N ING. Only qualified personnel should perform service procedures. Before
performing th
Summary and Service Safety Summary located at the beginning of this manual.
Also, to prevent possible injury to service personne l or damage to electrical
components, read Preventing ESD. (See page 9, Preventing ESD.)
To work on the instrument, place it face down in its protective front cover. You
can remove the tabs from the cover if you want to make it easy to move the
instrument in and out of the cover while working on it.
is or any other procedure in this manual, read the General Safety
Required equipment
e2:Removingtabsfromthefrontprotectivecover
Figur
move as assembly, refer to the module locator illustration. (See Figure 3
To re
on page 14.)
can also refer to the exploded view diagrams and parts lists. (See page 21,
You
Replaceable Parts List.) The parts lists show how many of each type of screw is
used to attach each replaceable module.
If you are disassembling the instrument for cleaning, refer to the Inspection and
Cleaning procedure for instructions. (See page 9, Inspection and cleaning.)
WAR N ING. 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.
You will need a Torx driver with a T-15 Torx tip to remove instrument screws.
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 13
Maintenance
To remove modules
To re m o ve an y of
remove the rear cover and separate the front chassis from the rear chassis.
To remove t h e F
you must first remove the Main board assembly, the Analog board assembly,
and the front chassis.
To remove or install the keypad, do not touch the switch contacts with your
fingers. The oils on your fingers will degrade or damage the switch contacts.
To help prevent damage to the keypad, use cotton gloves when removing or
installing the keyboard pad.
the instrument modules or assemblies, you must first
ront Panel board assembly or the front panel case assembly,
gure 3: Module locator
Fi
14 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Troubleshooting
Maintenance
This section contains information and procedures to help you isolate a defective
module in the MDO4000C Series oscilloscopes.
WAR N ING. Before performing this or any other procedure in this manual, read the
General Safety Summary and Service Safety Summary found at the beginning of
this manual
electrical components, read Preventing ESD. (See page 9, Preventing ESD.)
, and, to prevent possible injury to service personnel or damage to
Adjustment after repair
Required tools and
equipment
Test points
Instrument adjustment is required after you replace an y circuit board. Refer
to the Adjustments section for information about the adjustment. (See page 7,
Adjustments.)
You need the following equipment to troubleshoot the instrument.
Tools and equipment Example
DMM 3.5 digits or above
Test points on the Main board are shown in the troubleshooting illustration. (See
Figure
Troubleshooting procedure
The f
troubleshoot an instrument failure. Begin with the Primary troubleshooting
procedure flowchart. (See Figure 4.)
WAR N ING. Before removing the cabinet, disconnect the power cord from the line
voltage source. Failure to do so could cause serious injury or death.
5.)
ollowing figures are troubleshooting procedure flowcharts. Use them to
CAUTION. When you operate the instrument with the cabinet removed, the system
fan will not operate. You must provide an external fan to cool the interior of the
instrument. Failure to do so could cause instrument damage.
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 15
Maintenance
Figure 4: Primary troubleshooting procedure
16 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Maintenance
Figure 5: AC power supply troubleshooting procedure
NOTE. The test point voltages are printed on the Main board. From left to right in
the illustration, they are: +1.225 V, -1.2 V, -2.5 V, +1.5 V, -5 V, +12 V, +1.8 V,
+5 VA, +5 VSB, and +2.5 V, +3.3 V, +5 V.
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 17
Maintenance
Figure 6: Module isolation troubleshooting procedure
18 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Unpacking and repacking instructions
This section contains the information needed to unpack the oscilloscope and
repack it for shipment or storage.
Maintenance
Unpacking
Repacking
The oscilloscope and its standard accessories are carefully packed at the factory in
a shipping carton. If, upon receipt, damage to the shipping carton is evident, tell
the shipper. Tektronix, Inc. is not responsible for damage caused during shipping.
If you have not already done so, carefully remove the oscilloscope and its
accessories from the shipping carton and inspect them for damage. Save the
shipping carton for repacking or storage.
Use a corrugated cardboard shipping carton having a test strength of at least 275
pounds (125 kg) and with an inside dimension at least six inches (15.25 cm)
greater than the instrument dimensions.
If the instrument is being shipped to a Tektronix Service Center, enclose the
following information:
The owner’s address
Name and phone number of a contact person
Type and serial number of the instrument
on for returning
Reas
A complete description of the service required
torage
S
Seal the shipping carton with an industrial stapler or strapping tape.
Mark the address of the Tektronix Service Center and also your own return address
on the shipping carton in two prominent locations. See www.tektronix.com/service
to find a service center near you.
The oscilloscope should be stored in a clean, dry environment. The following
environmental characteristics apply for both shipping and storage:
Temperaturerange: -4°Fto+140°F(-20°Cto+60°C)
Altitude: To 39,370 feet (12,000 m )
See the Tektronix MDO4000C Series Mixed Domain Oscilloscopes Specifications
and Performance Verification Technical Reference for a complete listing of the
environmental specifications.
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 19
Maintenance
20 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Replaceable Parts List
This chapter contains a list of the replaceable modules for these oscilloscopes.
Use this list to identify and order replacement parts.
Parts ordering information
Replacement parts are available through your local Tektronix field office or
representative.
Changes to Tektronix products are sometimes made to accommodate improved
components as they become available and to give you the benefit of the latest
improvements. Therefore, when ordering parts, it is important to include the
following information in your order:
Part number (see Part Number Revision Level below)
Instrument type or model number
Instrument serial number
Instrument modification number, if applicable
If you order a part that has been replaced with a different or improved part, your
local Tektronix field office or representative will contact you concerning any
change in part number.
Part number revision level
Module servicing
Change information, if any, is located at the rear of this manual.
Tektronix part numbers contain two digits that show the revision level of the
part. For some parts in this manual, you will find the letters “xx” in place of the
revision level number.
When you order parts, Tektronix will provide you with the most current part for
your product type, serial number, and modification (if applicable). At the time of
your order, Tektronix will determine the part number revision level needed for
your product, based on the information you provide.
Modules can be serviced by selecting one of the next three options. Contact your
local Tektronix service center or representative for repair assistance.
Module exchange. In some cases you may exchange your module for a
remanufactured module. These modules cost significantly less than new modules
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 21
Replaceable Parts List
and meet the sam
exchange program, call 1-800-833-9200, extension 2.
Module repair and return. You may ship your module to us for repair, after which
we will return it to you.
New modules
replacement parts.
Using the replaceable parts list
This section contains a list of the mechanical and/or electrical components that
are replaceable for the instrument. Use this list to identify and order replacement
parts. The following table describes each column in the parts list.
Table 3: Parts list column descriptions
Column Column n
1
2Tektr
3 and 4
5
6
Figure
Number
Number
Serial Number Column three indicates the serial number at which the part was first effective. Column four
Qty This
Nam
ame
& Index
onix Part
e & Description
Descrip
Items i
illustrations that follow the list.
Use this part number when ordering replacement parts from Tektronix.
indicates the serial number at which the part was discontinued. No entries indicates the
part
An i
an item name may sometimes appear as incomplete. Use the U.S. Federal Catalog handbook
H6-1 for further item name identification.
tion
n this section are referenced by figure and index numbers to the exploded view
is good for all serial numbers.
indicates the quantity of parts used.
tem name is s eparated from the description by a colon (:). Because of space limitations,
efactoryspecifications. For more information about the module
. You may purchase replacement modules in the same way as other
Abbreviations
Exploded views
Abbreviations conform to American National Standard ANSI Y1.1-1972.
The illustrations in this section show the module-level exploded views of the
scilloscopes. Each exploded view is indexed by the numbers in the figure. The
o
table of index numbers and part numbers corresponding to a picture are in the
table immediately proceeding the illustration.
22 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Replaceable Parts List
Table 4: Front p
Fig. &
index
number
anel assembly, non-SA models
Serial
Tektronix
part numb er
no.
effective
Serial no.
discont’d Qty Name & descrip tion
-1 850-0327-xx Front panel assembly
-2 202-0542-xx 1
-3 366-0855-xx 2
-4 366-0858-xx 1
-5
-6 366-0857-xx 1
-7
-8 366-0853-xx
-9
-10 260-2898-xx 1
-11 407-5259-xx 1
-12 211-1273-xx 19
-13 260-2858-xx 1
-14 407-5267-xx 1
-15 260-3061-xx 1
-16 105-1174-xx 1
-17 878-1250-xx 1
-18 131-8139-00 10
-19 351-1026-00 2
358-0883-xx 1
366-0851-xx 6
335-3608-xx 1
335-3609-xx 1
335-3610-xx 1
335-3611-xx 1
335-3612-xx 1
335-3613-xx 1
335-3614-xx 1
335-3615-xx 1
335-3616-xx 1
335-3617-xx 1
5
FRONT CASE
KNOB, CAP .925 DIAMETER, SOFT TOUCH
KNOB, SHUTTLE SOFT TOUCH
BUSHING (JOG SHUTTLE KNOB)
KNOB, JOG SOFT TOUCH
KNOB, CAP .470 IN DIAMETER, SOFT TOUCH
KNOB, CAP .685 IN DIAMETER, SOFT TOUCH
LABEL. FRONT PANEL, OVERLAY, FRENCH, NON-SA
LABEL. FRONT PANEL, OVERLAY, RUSSIAN, NON-SA
LABEL. FRONT PANEL, OVERLAY, ITALIAN, NON-SA
LABEL. FRONT PANEL, OVERLAY, GERMAN, NON-SA
LABEL. FRONT PANEL, OVERLAY, SPANISH, NON-SA
LABEL. FRONT PANEL, OVERLAY, JAPANESE, NON-SA
LABEL. FRONT PANEL, OVERLAY, PORTUGUESE, NON-SA
LABEL. FRONT PANEL, OVERLAY, SIMPLE CHINESE, NON-SA
LABEL. FRONT PANEL, OVERLAY, TRADITIONAL CHINESE, NON-SA
LABEL FRONT PANEL OVERLAY, KOREAN, NON-SA
SWITCH, KEYPAD, ELASTOMERIC, POWER
BRACKET, SUPPORT: POWER SWITCH
SCREW, PT, K35-1.57, PAN HEAD, STL, ZNPL, T-15 TORX DRIVE
------DISTRIBUTIONOFTHE211-1273-00 SCREWS - - ----
2 screws attach the Power switch and bracket to the front case assembly.
2 screws attach the Utility switch and bracket to the front case assembly.
10 screws attach the Front panel assembly to the front case assembly – with contact
springs (#15).
5 screws across the bottom of the Front panel assembly attach it to the front case assembly
– without contact springs.
SWITCH, KEYPAD, ELASTOMERIC, UTILITY
BRACKET, SUPPORT, UTILITY SWITCH
SWITCH, KEYPAD, ELASTOMERIC, FRONT PANEL
ACTUATOR, SWITCH, 10 KEY
CIRCUIT BOARD ASSEMBLY, FRONT PANEL
CONTACT, SPRING: FRONT PANEL ELEC
GUIDE, KEY; POLY, BAYBLEND FR-110
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 23
Replaceable Parts List
Fig. &
index
number
-20 213-1149-XX 2
-21 131-6643-xx 1
-22 200-5049-xx 1
Tektronix
part number
Serial
no.
effective
Serial no.
discont’d Qty Name & description
SCREW, TPG, TF; 2-28 X.5, PLASTITE, FLAT HEAD, PHILLIPS, STL, ZNPL
CONTACT, ELEC; GROUNDING
COVER; OPTION KEY DOOR
Figure 7: Front panel assembly, non-SA models
24 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Replaceable Parts List
Table 5: Front p
Fig. &
index
number
anel assembly, SA models
Serial
Tektronix
part numb er
no.
effective
Serial no.
discont’d Qty Name & descrip tion
-1 850-0328-xx Front panel assembly
-2 202-0477-xx 1
-3 366-0861-xx 2
-4 366-0858-xx 1
-5
-6 366-0865-xx 1
-7
-8 366-0860-xx
-9
-10 260-2898-xx 1
-11 407-5259-xx 1
-12 211-1273-xx 19
-13 260-2858-xx 1
-14 407-5267-xx 1
-15 260-3060-xx 1
-16 105-1174-xx 1
-17 878-1249-xx 1
-18 131-8139-00 10
-19 351-1026-00 2
358-0883-xx 1
366-0859-xx 6
335-3598-xx 1
335-3599-xx 1
335-3600-xx 1
335-3601-xx 1
335-3602-xx 1
335-3603-xx 1
335-3604-xx 1
335-3605-xx 1
335-3606-xx 1
335-3607-xx 1
5
FRONT CASE
KNOB, CAP .925 DIAMETER, SOFT TOUCH
KNOB, SHUTTLE SOFT TOUCH
BUSHING (JOG SHUTTLE KNOB)
KNOB, JOG SOFT TOUCH
KNOB, CAP .470 DIAMETER, SOFT TOUCH
KNOB, CAP .685 DIAMETER, SOFT TOUCH
LABEL. FRONT PANEL, OVERLAY, FRENCH, SA
LABEL. FRONT PANEL, OVERLAY, RUSSIAN, SA
LABEL. FRONT PANEL, OVERLAY, ITALIAN, SA
LABEL. FRONT PANEL, OVERLAY, GERMAN, SA
LABEL. FRONT PANEL, OVERLAY, SPANISH, SA
LABEL. FRONT PANEL, OVERLAY, JAPANESE, SA
LABEL. FRONT PANEL, OVERLAY, PORTUGUESE, SA
LABEL. FRONT PANEL, OVERLAY, SIMPLE CHINESE, SA
LABEL. FRONT PANEL, OVERLAY, TRADITIONAL CHINESE, SA
LABEL FRONT PANEL OVERLAY, KOREAN, SA
SWITCH, KEYPAD, ELASTOMERIC, POWER
BRACKET, SUPPORT: POWER SWITCH
SCREW, PT, K35-1.57, PAN HEAD, STL, ZNPL, T-15 TORX DRIVE
------DISTRIBUTIONOFTHE211-1273-00 SCREWS - - ----
2 screws attach the Power switch and bracket to the front case assembly.
2 screws attach the Utility switch and bracket to the front case assembly.
10 screws attach the Front panel assembly to the front case assembly – with contact
springs (#15).
5 screws across the bottom of the Front panel assembly attach it to the front case assembly
– without contact springs.
SWITCH, KEYPAD, ELASTOMERIC, UTILITY
BRACKET, SUPPORT, UTILITY SWITCH
SWITCH, KEYPAD, ELASTOMERIC, FRONT PANEL
ACTUATOR, SWITCH, 10 KEY
CIRCUIT BOARD ASSEMBLY, FRONT PANEL
CONTACT, SPRING: FRONT PANEL ELEC
GUIDE, KEY; POLY, BAYBLEND FR-110
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 25
Replaceable Parts List
Fig. &
index
number
-20 213-1149-XX 2
-21 131-6643-xx 1
-22 200-5049-xx 1
Tektronix
part number
Serial
no.
effective
Serial no.
discont’d Qty Name & description
SCREW, TPG, TF; 2-28 X.5, PLASTITE, FLAT HEAD, PHILLIPS, STL, ZNPL
CONTACT, ELEC; GROUNDING
COVER; OPTION KEY DOOR
Figure 8: Front panel assembly, SA models
26 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Replaceable Parts List
Table 6: Displa
y, analog, and main board assemblies, non-SA models
Figure
and
index
no.
-1 850-0110-xx 1
-2 211-0722-xx 43
-3 441-2608-xx 1
-4 211-1273-xx 8
-5
-6 174-5809-xx 1
-7
-8 351-1134-xx 1
-9 174-5807-xx 1
-10
-11 129-1693-xx 1
-12
-13 131-7622-xx 1
-14 361-1858-xx 1
Tektronix
part no.
131-6643-xx 6
131-6417-xx 4
-------
-------
Serial
no.
effective
Serial
no.
discont'd Qty. Name and description
FRAME ASSEMBLY, DISPLAY: LCD
SCREW, MACHINE; 6-32 X 0.250, PNH, STEEL, ZINC FINISH, T-15 TORX DR
------DISTRIBUTIONOFTHE211-0722-xxSCREWS-------
9 screws attach the LCD assembly to the front chassis.
15 screws attach the Main board assembly to the front chassis.
6 screws attach the Analog board assembly to the front chassis.
12 screws attach the rear chassis to the front chassis: 4 across the top flange of the rear
chassis,2oneachsideflange, and 4 across the bottom flange of the front chassis.
1 screw attaches the ground jack to the front chassis.
CHASSIS ASSEMBLY, FRONT
SCREW, PT, K35–1.57, PAN HEAD, STL, ZNPL, T-15 TORX DRIVE
CONTACT, ELEC: GROUNDING, 0.169 L X 0.250 W X 0.320 D, ELECTROLESS
NICKEL PLATE
CABLE ASSEMBLY FRONT PANEL TO MAIN BOARD
CONTACT, ELEC: GROUNDING, 0.600 L X 0.250 W X 0.220 D, ELECTROLESS NICKEL
PLATE
DIGITAL PROBE GUIDE
DISPLAY BACKLIGHT CABLE ASSEMBLY
1
1
MAIN BOARD ASSEMBLY. Return the instrument to Tektronix for service. The Main board
and the Analog board must be replaced together.
SPACER, POST
ANALOG BOARD ASSEMBLY. Return the instrument to Tektronix for service. The Analog
board and the Main board must be replaced together.
CONN, RECEPT; GROUND JACK
SPACER, BOARD SUPPORT
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 27
Replaceable Parts List
Figure 9: Display, analog, and main board assemblies, non-SA models
28 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Replaceable Parts List
Table 7: Displa
y, analog, and main board assemblies, SA models
Figure
and
index
no.
-1 850-0110-xx 1
-2 211-0722-xx 43
-3 441-2608-xx 1
-4 211-1273-xx 8
-5
-6 174-5809-xx 1
-7
-8
-9 351-1134-xx 1
-10 174-5807-xx 1
-11
-12 129-1693-xx 1
-13 131-7622-xx 1
-14 361-1858-xx 1
Tektronix
part no.
131-6643-xx 6
131-6417-xx 4
-------
-------
Serial
no.
effective
Serial
no.
discont'd Qty. Name and description
FRAME ASSEMBLY, DISPLAY: LCD
SCREW, MACHINE; 6-32 X 0.250, PNH, STEEL, ZINC FINISH, T-15 TORX DR
------DISTRIBUTIONOFTHE211-0722-xxSCREWS-------
9 screws attach the LCD assembly to the front chassis.
15 screws attach the Main board assembly to the front chassis.
6 screws attach the Analog board assembly to the front chassis.
12 screws attach the rear chassis to the front chassis: 4 across the top flange of the rear
chassis,2oneachsideflange, and 4 across the bottom flange of the front chassis.
1 screw attaches the ground jack to the front chassis.
CHASSIS ASSEMBLY, FRONT
SCREW, PT, K35–1.57, PAN HEAD, STL, ZNPL, T-15 TORX DRIVE
CONTACT, ELEC: GROUNDING, 0.169 L X 0.250 W X 0.320 D, ELECTROLESS
NICKEL PLATE
CABLE ASSEMBLY FRONTPANEL TO MAINBOARD
CONTACT, ELEC: GROUNDING, 0.600 L X 0.250 W X 0.220 D, ELECTROLESS NICKEL
PLATE
1
1
ANALOG BOARD ASSEMBLY. Return the instrument to Tektronix for service. The Analog
board and the Main board must be replaced together.
DIGITAL PROBE GUIDE
DISPLAY BACKLIGHT CABLE ASSEMBLY
MAIN BOARD ASSEMBLY. Return the instrument to Tektronix for service. The Main board
and the Analog board must be replaced together.
SPACER, POST
CONN, RECEPT; GROUND JACK
SPACER, BOARD SUPPORT
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 29
Replaceable Parts List
Figure 10: Display, analog, and main board assemblies, SA models
30 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Replaceable Parts List
Table 8: Rear ch
assis, all models
Figure
and
index
no.
-1 119-7597-xx 1
-2 211-0722-xx 15
-3 407-5462-xx 1
-4 870-1251-xx 1
-5
-6 119-7086-xx 1
-7
-8 131-6417-xx 1
-9 335-3585-xx 1
-10 214-3903-xx 2
-11 220-0268-xx 1
-12 065-0961-01 1
Tektronix
part no.
174-5835-xx 1
065-0960-xx 1
Serial
no.
effective
Serial
no.
discont'd Qty. Name and description
POWER SUPPLY; ROHS COMPLIANT; SAFETY CONTROLLED
SCREW, MACHINE; 6-32 X 0.250, PNH, STEEL, ZINC FINISH, T-15 TORX DR
- - - - - - DISTRIBUTION OF THE 211-0722-xx SCREWS - - - - - - -
1 screw attaches the I/O board to the rear chassis.
4 screws attach the Power supply circuit board to the Power supply bracket.
4 screws attach the Power supply bracket to the rear chassis.
2 screws attach the line filter to the rear chassis.
4 screws attach the system fan (#12) to the rear chassis.
BRACKET, POWER SUPPLY BOARD MOUNT
I/O BOARD ASSEMBLY. This module is not customer replaceable. Return the instrument
to Tektronix for service and calibration..
CABLE ASSEMBLY (LINE INPUT)
FILTER, EMI, AC LINE CONNECTOR
CHASSIS ASSEMBLY, REAR
CONTACT, ELEC: GROUNDING, 0.600 L X 0.250 W X 0.220 D, ELECTROLESS NICKEL
PLATE
LABEL, IO, REAR
SCREW, JACK; 4-40 X 0.312 LONG, 0.188 H HEX HEAD STAND OFF
NUT, PLAIN, HEX; 0.5-28 X 0.625; WITH WASHER
SYSTEM FAN ASSEMBLY, 120 MM, WITH BRACKET
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 31
Replaceable Parts List
Figure 11: Rear chassis, all models
32 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Replaceable Parts List
Table 9: Front a
Figure
and
index
no.
-1 200-5130-xx 1
-2 065-0856-xx 1
-3 211-0722-xx 4
nd back case
Tektronix
part no.
Serial
no.
effective
Serial
no.
discont'd Qty. Name and description
FRONT PROTECTIVE COVER
REAR CASE ASSEMBLY
SCREW, MACHINE; 6-32 X 0.250, PNH, STEEL, ZINC FINISH, T-15 TORX DR
Figure 12: Front and back case
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 33
Replaceable Parts List
Table 10: Cable
Figure
and
index
no.
-1 174-5835-xx 1
-2 343-1736-xx 2
and connectors, rear chassis
Serial
Tektronix
part no.
no.
effective
Serial
no.
discont'd Qty. Name and desc ription
CABLE ASSEMBLY, LINE INPUT
CLAMP, CABLE
Figure 13: Rear chassis, showing cables and connectors
34 MDO4000C Series Mixed Domain Oscilloscopes Service Manual
Replaceable Parts List
Table 11: Cable
Figure
and
index
no.
-1 174-5809-xx 1
-2 346-0120-xx 1
and connectors, main board
Serial
Tektronix
part no.
no.
effective
Serial
no.
discont'd Qty. Name and description
CABLE, MAIN BOARD TO FRONT PANEL BOARD
STRAP, TIEDOWN; 5.5 L MIN, PLASTIC, WHITE
Figure 14: Main board, showing cable and connectors
MDO4000C Series Mixed Domain Oscilloscopes Service Manual 35
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