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Theory of Operation

Processor System

The Processor system contains a microprocessor that controls the entire
instrument. The processor system also contains FLASH ROM, system RAM, and
interfaces to USB ports and the Ethernet port.

Power Converter

The Mezzanine board converts the +12 V power to other voltages used for the
analog and digital circuitry throughout the system. The +5 V standby power is
used to keep the Front Panel powered up at all times that AC power is connected
to the unit.

Front-Panel Board

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 system. The Front Panel board also generates
the probe compensation output signal, provides an interface to the application
modules, and controls power to the system.

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MDO3000 Series Mixed Domain Oscilloscopes Service Manual

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Содержание MDO3000 Series

Страница 1: ...xx MDO3000 Series Mixed Domain Oscilloscopes ZZZ Service Manual P077098100 077 0981 00 ...

Страница 2: ......

Страница 3: ...l 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 ...

Страница 4: ...sued 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 8...

Страница 5: ...heory 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 Mi...

Страница 6: ...ure 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 ...

Страница 7: ...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 ...

Страница 8: ...ment 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 comp...

Страница 9: ...he 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 s...

Страница 10: ...nect 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 th...

Страница 11: ...ety 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 servi...

Страница 12: ...t 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 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 th...

Страница 13: ...ou should become familiar with before performing service Modules Throughout this manual any replaceable component assembly or part is referred to by the term module 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 dis...

Страница 14: ...Preface x MDO3000 Series Mixed Domain Oscilloscopes Service Manual ...

Страница 15: ...ating your oscilloscope refer to the Tektronix MDO3000 Series Mixed Domain Oscilloscopes User Manual which was included on the documentation CD provided with your oscilloscope This manual is available in 11 languages MDO3000 Series Mixed Domain Oscilloscopes Service Manual 1 ...

Страница 16: ...Where to Find Operating Information 2 MDO3000 Series Mixed Domain Oscilloscopes Service Manual ...

Страница 17: ...en into acquisition memory The analog signal from each preamplifier is also distributed to a trigger circuit All of the inputs including RF are routed to the Analog board The analog channels are amplified and attenuated through the front end circuitry and are output to the Main board The RF channel is the same except that the RF input signal is routed through a shared connection with analog CH4 Th...

Страница 18: ...t the system The 5 V standby power is used to keep the Front Panel powered up at all times that AC power is connected to the unit Front Panel Board 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 system The Front Panel board also generates the probe compensatio...

Страница 19: ...Theory of Operation Figure 1 MDO3000 Series block diagram MDO3000 Series Mixed Domain Oscilloscopes Service Manual 5 ...

Страница 20: ...Theory of Operation 6 MDO3000 Series Mixed Domain Oscilloscopes Service Manual ...

Страница 21: ...re the use of traceable test equipment signal sources and measuring equipment to verify the performance of the instrument To determine if adjustment is required use the Performance Verification procedure in the MDO3000 Series Mixed Domain Oscilloscopes Specifications and Performance Verification manual available at www tektronix com manuals Adjustment is also required after instrument repair MDO30...

Страница 22: ...Adjustments 8 MDO3000 Series Mixed Domain Oscilloscopes Service Manual ...

Страница 23: ...ensitive 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 Service static sensitive modules only at a static free work station 4 Do not place anything capable of generating or holding a static charge on the wor...

Страница 24: ...lay surface Avoid scrubbing the display with excessive force 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 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...

Страница 25: ...t 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 wash 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 an...

Страница 26: ...1 Blow off dust with dry low pressure deionized air approximately 9 psi 2 Remove any remaining dust with a lint free cloth dampened in isopropyl alcohol 75 solution and rinsed with warm deionized water A cotton tipped applicator is useful for cleaning in narrow spaces and on circuit boards NOTE If after performing steps 1 and 2 a module is clean upon inspection skip the following steps If there is...

Страница 27: ... 2 Removing tabs from the front protective cover To remove as assembly refer to the module locator illustration See Figure 3 on page 14 You can also refer to the exploded view diagrams and parts lists See page 21 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 Insp...

Страница 28: ...e assembly 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 Figure 3 Module locator 14 MDO3000 Series Mi...

Страница 29: ...d Equipment You need the following equipment to troubleshoot the instrument Tools and Equipment Example DMM 3 5 digits or above Test Points Test points on the Main board are shown in the troubleshooting illustration See Figure 5 Troubleshooting Procedure The following figures are troubleshooting procedure flowcharts Use them to troubleshoot an instrument failure Begin with the Primary troubleshoot...

Страница 30: ...Maintenance Figure 4 Primary troubleshooting procedure 16 MDO3000 Series Mixed Domain Oscilloscopes Service Manual ...

Страница 31: ... power supply troubleshooting procedure NOTE The test point voltages are printed on the Main board The 12 V test point is on the upper right hand corner of the board MDO3000 Series Mixed Domain Oscilloscopes Service Manual 17 ...

Страница 32: ...Maintenance Figure 6 Module isolation troubleshooting procedure 18 MDO3000 Series Mixed Domain Oscilloscopes Service Manual ...

Страница 33: ... 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 Reason for returning A complete description of the service required Seal the shipping carton with an industrial stapler or strapping tape Mark the address of the Tektronix Service Center and also y...

Страница 34: ...Maintenance 20 MDO3000 Series Mixed Domain Oscilloscopes Service Manual ...

Страница 35: ... 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 Change information if any is located at the rear of this manual Part Number Revision Level Tektronix part numbers contain two digits that show the revision level of the pa...

Страница 36: ...emanufactured module These modules cost significantly less than new modules and meet the same factory specifications For more information about the module 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 You may purchase replacement modules in the same way as other replacement parts ...

Страница 37: ...r Column three indicates the serial number at which the part was first effective Column four indicates the serial number at which the part was discontinued No entries indicates the part is good for all serial numbers 5 Qty This indicates the quantity of parts used 6 Name Description An item name is separated from the description by a colon Because of space limitations an item name may sometimes ap...

Страница 38: ...AY SPANISH 335 2668 00 1 LABEL FRONT PANEL OVERLAY JAPANESE 335 2669 00 1 LABEL FRONT PANEL OVERLAY PORTUGUESE 335 2670 00 1 LABEL FRONT PANEL OVERLAY SIMPLIFIED CHINESE 335 2671 00 1 LABEL FRONT PANEL OVERLAY TRADITIONAL CHINESE 335 2672 00 1 LABEL FRONT PANEL OVERLAY KOREAN 8 335 2673 00 1 LABEL FRONT PANEL OVERLAY RUSSIAN 9 260 2857 00 1 SWITCH KEYPAD ELASTOMERIC POWER 10 407 5259 00 1 BRACKET ...

Страница 39: ...2 CH 16 878 0764 xx 1 CIRCUIT BOARD ASSEMBLY FRONT PANEL 4 CH 17 131 8139 00 10 CONTACT SPRING FRONT PANEL ELEC 18 351 1109 01 2 GUIDE KEY POLY BAYBLEND FR 110 19 213 1149 00 2 SCREW TPG TF 2 28 X 5 PLASTITE FLAT HEAD PHILLIPS STL ZNPL 20 259 0212 00 1 CIRCUIT FLEX 10 KEY 21 200 5301 00 1 COVER OPTION KEY DOOR PC ABS FR110 SILVER GRAY 22 200 5052 00 1 COVER FRONT PROTECTIVE MDO3000 Series Mixed Do...

Страница 40: ...Replaceable Parts List Figure 7 Exploded view front panel assembly 26 MDO3000 Series Mixed Domain Oscilloscopes Service Manual ...

Страница 41: ...1 MAIN BOARD ASSEMBLY Return the instrument to Tektronix for service The Main board and the Attenuator board must be calibrated together if either is found defective 10 351 1130 xx 1 GUIDE PROBE 11 129 1693 00 1 SPACER POST 12 348 1863 xx 1 EMI GASKET 878 0801 xx 1 ATTENUATOR BD 500 MHz 2 CH Return the instrument to Tektronix for service The Main board and the Attenuator board must be calibrated t...

Страница 42: ...Replaceable Parts List Figure 8 Display analog board and main board assembly 28 MDO3000 Series Mixed Domain Oscilloscopes Service Manual ...

Страница 43: ...e rear chassis to the front chassis 3 119 7086 00 1 FILTER EMI AC LINE CONNECTOR 4 441 2741 00 1 CHASSIS ASSEMBLY REAR 5 065 0965 00 1 REAR CASE ASSEMBLY 6 211 1275 xx 4 SCREW DISTRIBUTION OF THE 211 1275 00 SCREWS 4 screws attach the Power supply circuit board to the rear chassis 7 214 3903 00 2 SCREW JACK 4 40 X 0 312 LONG 0 188 H HEX HEAD STAND OFF 8 335 3149 00 1 LABEL IO REAR 9 343 1736 xx 1 ...

Страница 44: ...Replaceable Parts List Figure 9 Rear chassis and connecting modules 30 MDO3000 Series Mixed Domain Oscilloscopes Service Manual ...

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