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Tektronix DPO4034B, Service Manual

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Tektronix DPO4034B Service Manual Download Page 16

Theory of Operation

Power Converter

The Power Converter re12 V power and +5 V standby power from the
main power supply and generates voltages for the analog and digital circuitry on
the Main board. The front panel receives the +5 V standby power, and uses input
from the power switch to turn the oscilloscope on and off.

Front-Panel Board

The Front Panel board contains a microprocessor that reads the front-panel buttons
and controls, and then sends this information to the processor system on the Main
board. The Front Panel board also generates the probe compensation output signal
and provides an interface to the application modules.

4

MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual

Summary of Contents for DPO4034B

Page 1: ...xx MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes ZZZ Service Manual P077051201 077 0512 01...

Page 2: ......

Page 3: ...applies to firmware version 1 00 and above 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...

Page 4: ...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 Tek...

Page 5: ...ments 8 Navigating During Adjustments 8 Connecting the Equipment 9 Factory Adjustment Procedure 10 Setting the Calibrator Output Signal 13 Maintenance 19 Preventing ESD 19 Inspection and Cleaning 19 M...

Page 6: ...ing procedure 26 Figure 6 AC power supply troubleshooting procedure 27 Figure 7 Module isolation troubleshooting procedure 28 Figure 8 Exploded view Front Panel assembly 34 Figure 9 Display Analog boa...

Page 7: ...el assembly 33 Table 5 Replaceable parts Display Analog board and Main board 35 Table 6 Replaceable parts Rear chassis and connecting modules 37 Table 7 Replaceable parts external parts 39 Table 8 Rep...

Page 8: ...l 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 Con...

Page 9: ...damage to this product or other property Symbols and Terms on the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNIN...

Page 10: ...General Safety Summary vi MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual...

Page 11: ...e 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...

Page 12: ...Preface viii MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual...

Page 13: ...tal Phosphor Oscilloscope refer to the Tektronix MSO4000B Series and DPO4000B Series Digital Phosphor Oscilloscopes User Manual which was provided with your oscilloscope This manual is also available...

Page 14: ...Where to Find Operating Information 2 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual...

Page 15: ...The analog signal from each preamplifier goes through a digitizer a time base controller and then into acquisition memory The analog signal from each preamplifier is also distributed to a trigger circ...

Page 16: ...s input from the power switch to turn the oscilloscope on and off Front Panel Board The Front Panel board contains a microprocessor that reads the front panel buttons and controls and then sends this...

Page 17: ...Theory of Operation Figure 1 Four channel model MSO4000B and DPO4000B series block diagram MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual 5...

Page 18: ...Theory of Operation Figure 2 Two channel model MSO4000B and DPO4000B series block diagram 6 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual...

Page 19: ...r 1 6 ms 625 Hz 0 5p p symmetrical about 0 V into 50 Fluke 9500B Oscilloscope Calibrator with one 9530 head Sine Generator Symmetrical about 0 V from 250 mV to 25 V into 1 M Aberrations 0 1 after 500...

Page 20: ...ustments performed before warm up or outside this temperature range may result in poor performance or failure of the adjustment procedure Learn how to operate the oscilloscope calibrator Refer to the...

Page 21: ...rough 4 on the calibrator to channels 1 through 4 on the oscilloscope Make sure that Channel 1 on the calibrator connects to the Channel 1 input on the oscilloscope and so on Connect the Digital Probe...

Page 22: ...ads following the instructions provided in Connecting the Equipment See page 9 Connecting the Equipment 4 Put the oscilloscope into the service mode as follows can take up to a minute a Power off the...

Page 23: ...formance Verification a View the prompt on the oscilloscope screen to determine the required signal type amplitude and frequency as well as the required channel s b Use the information provided on the...

Page 24: ...djustment procedure and try the entire procedure again If the procedure still fails it could indicate a problem with the oscilloscope Contact Tektronix for technical support see the contact informatio...

Page 25: ...1 M and voltages 5 5 V into 50 1 Select the calibrator signal type as follows a Push the DC Square button b Push the WAVEFORM lower bezel button and then push the DC Positive right bezel button 2 Set...

Page 26: ...The calibrator signal will remain at this voltage for only a few seconds so the adjustment step must be done immediately after setting the calibrator amplitude 7 If the instrument fails one of these s...

Page 27: ...d 3 Set the calibrator amplitude as follows a Select the Amplitude field using the front panel tab key b Set the voltage specified by the oscilloscope prompt 4 Set the calibrator frequency as follows...

Page 28: ...pe prompt c Push the LOAD lower bezel button to highlight either 1 M or 50 as specified by the oscilloscope prompt d Push the EXIT lower bezel button 3 Set the calibrator amplitude as follows a Select...

Page 29: ...grounding button on When this is active you will not be able to make a channel selection so in some cases you might need to temporarily deselect the grounding option while you make a channel selectio...

Page 30: ...Adjustment Procedure 18 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual...

Page 31: ...odules 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 wr...

Page 32: ...e 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 Kimbe...

Page 33: ...rmed 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 it...

Page 34: ...ing 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...

Page 35: ...ving tabs from the front protective cover To remove as assembly refer to the module locator illustration See Figure 4 on page 24 You can also refer to the exploded view diagrams and parts lists See pa...

Page 36: ...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 finge...

Page 37: ...fer to the Adjustment Procedures section for information about the adjustment See page 7 Adjustment Procedure Required Tools and Equipment You need the following equipment to troubleshoot the instrume...

Page 38: ...Maintenance Figure 5 Primary troubleshooting procedure 26 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual...

Page 39: ...re 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 MSO4000B and DPO40...

Page 40: ...Maintenance Figure 7 Module isolation troubleshooting procedure 28 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual...

Page 41: ...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 retu...

Page 42: ...Maintenance 30 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual...

Page 43: ...eplaced 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...

Page 44: ...ced by figure and index numbers to the exploded view illustrations that precede the list 2 Tektronix Part Number Use this part number when ordering replacement parts from Tektronix 3 and 4 Serial Numb...

Page 45: ...74 01 1 LABEL FRONT PANEL OVERLAY KOREAN 7 335 2375 01 1 LABEL FRONT PANEL OVERLAY RUSSIAN 8 260 2898 00 1 SWITCH KEYPAD ELASTOMERIC POWER 9 407 5259 00 1 BRACKET SUPPORT POWER SWITCH SCREW MACHINE 6...

Page 46: ...Replaceable Parts List Figure 8 Exploded view Front Panel assembly 34 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual...

Page 47: ...nge and 4 across the bottom flange of the front chassis 2 211 1272 00 40 1 screw attaches the ground jack to the front chassis 3 441 2608 00 1 CHASSIS ASSEMBLY FRONT 4 211 1273 00 8 SCREW PT K35 1 57...

Page 48: ...Replaceable Parts List Figure 9 Display Analog board and Main board assembly 36 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual...

Page 49: ...filter to the rear chassis 2 211 1272 00 15 4 screws attach the system fan 12 to the rear chassis 3 407 5462 00 1 BRACKET POWER SUPPLY BOARD MOUNT 4 878 0278 01 1 I O BOARD ASSEMBLY 5 119 7086 00 1 F...

Page 50: ...Replaceable Parts List Figure 10 Rear chassis and connecting modules 38 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual...

Page 51: ...tive Serial no discont d Qty Name and description 11 EXTERNAL PARTS 1 200 5130 00 1 FRONT PROTECTIVE COVER 2 065 0856 00 1 REAR CASE ASSEMBLY 3 211 1272 00 4 SCREW MACHINE 6 32 x 0 250 PNH STL ZNPL T...

Page 52: ...ktronix part no Serial no effective Serial no discont d Qty Name and description 12 CABLES REAR CHASSIS 1 174 5835 00 1 CABLE ASSEMBLY LINE INPUT 2 343 1736 00 2 CLAMP CABLE Figure 12 Rear chassis sho...

Page 53: ...erial no effective Serial no discont d Qty Name and description 13 Cable Main Board 1 174 5809 00 1 CABLE MAIN BOARD TO FRONT PANEL BOARD 2 346 0120 00 1 STRAP TIEDOWN 5 5 L MIN PLASTIC WHITE Figure 1...

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