Tektronix TBS1000C Service Manual

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TBS1000C Series Digital Storage Oscilloscope

Service Manual

*P077158401*

077-1584-01

TBS1000C Series Digital Storage Oscilloscope

Service Manual

077-1584-01

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 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.

Table of Contents

List of Tables................................................................................................................................................................................. 6

Important safety information..........................................................................................................................................................7

General safety summary........................................................................................................................................................7

Service safety summary.........................................................................................................................................................9

Terms in the manual...............................................................................................................................................................9

Terms on the product............................................................................................................................................................. 9

Symbols on the product....................................................................................................................................................... 10

Preface........................................................................................................................................................................................ 11

Manual conventions............................................................................................................................................................. 11

Related documentation........................................................................................................................................................ 11

Maintenance................................................................................................................................................................................12

Inspection and cleaning....................................................................................................................................................... 12

General care........................................................................................................................................................................ 12

Interior cleaning................................................................................................................................................................... 12

Exterior cleaning.................................................................................................................................................................. 12

Exterior inspection............................................................................................................................................................... 12

Interior inspection.................................................................................................................................................................13

Cleaning procedure interior..................................................................................................................................................13

Lubrication........................................................................................................................................................................... 14

Adjustments................................................................................................................................................................................ 15

Replaceable parts....................................................................................................................................................................... 16

Parts ordering information....................................................................................................................................................16

Part number revision level................................................................................................................................................... 16

Module exchange.................................................................................................................................................................16

New modules....................................................................................................................................................................... 16

Using the replaceable parts list............................................................................................................................................16

Abbreviations....................................................................................................................................................................... 17

Parts lists and exploded views.............................................................................................................................................17

TBS1000C Series Digital Storage Oscilloscope Service Manual 5

List of Tables

Table 1: External inspection checklist......................................................................................................................................... 13

Table 2: Internal inspection checklist...........................................................................................................................................13

Table 3: Replaceable parts list.................................................................................................................................................... 17

Table 4: Replaceable parts — (LCD, Front panel, Front case, Power supply, Main board, and Rear case)...............................18

TBS1000C Series Digital Storage Oscilloscope Service Manual 6

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.

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-referenced oscilloscope use

Power disconnect The power cord disconnects the product from the power source. See instructions for the location. Do not

Use proper AC adapter Use only the AC adapter specified for this product.

Connect and disconnect properly

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).

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.

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 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.

Do not apply a potential to any terminal, including the common terminal, that exceeds the maximum rating of that terminal.

TBS1000C Series Digital Storage Oscilloscope Service Manual 7

Important safety information

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.

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

Do not operate in wet/damp conditions

Do not operate in an explosive atmosphere

Keep product surfaces clean and dry

Provide proper ventilation Refer to the installation instructions in the manual for details on installing the product so it has proper

Provide a safe working environment

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.

Remove the input signals before you clean the product.

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.

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.

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 (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

TBS1000C Series Digital Storage Oscilloscope Service Manual 8

Important safety information

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

Inspect the probe and accessories

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.

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.

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.

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.

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 power on

Verify safety after repair Always recheck ground continuity and mains dielectric strength after performing a repair.

Dangerous 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.

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.

Terms 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.

TBS1000C Series Digital Storage Oscilloscope Service Manual 9

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:

` `

Important safety information

TBS1000C Series Digital Storage Oscilloscope Service Manual 10

Preface

This service manual provides information to verify the performance, calibrate, troubleshoot, disassemble, and replace parts on the TBS1000C Series Digital Storage Oscilloscopes.

Unless noted otherwise, the term "oscilloscope" refers to all models in the TBS1000C series.

Manual conventions

This manual uses certain conventions that you should become familiar with before attempting service.

Maintenance

Inspection and cleaning

Inspection and cleaning are done as preventive maintenance. Preventive maintenance, when done regularly, can prevent oscilloscope malfunction and enhance its reliability.

Preventive maintenance consists of visually inspecting and cleaning the oscilloscope, and using general care when operating it. How often you do maintenance depends on the severity of the environment in which you use the oscilloscope. A good time to perform preventive maintenance is just before adjustment of the oscilloscope.

General care

For best performance, follow these recommendations:

• Protect the oscilloscope from adverse weather conditions. The oscilloscope is not waterproof.

• Do not store or leave the oscilloscope where the liquid crystal display (LCD) is exposed to direct sunlight or high humidity for long

periods of time.

• The front and rear cases help to keep dust out of the oscilloscope and must be in place during the normal operation.

• To avoid damage to the oscilloscope or probes, do not expose them to any sprays, liquids, or solvents.

Interior cleaning

Use a dry, low-velocity stream of air to clean the interior of the chassis. Use a soft-bristle, non-static-producing brush for cleaning around components. If you must use a liquid for minor interior cleaning, use a 75% isopropyl alcohol solution and rinse with deionized water.

Warning: To avoid injury, power off the instrument and disconnect it from line voltage before performing any procedure that follows.

Exterior cleaning

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, consult your Tektronix Service Center or representative.

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 may damage the chassis.

CAUTION: To prevent getting moisture inside the oscilloscope during external cleaning, use only enough liquid to dampen the cloth or applicator.

Clean the On/Standby switch using a dampened cleaning towel. Do not spray or wet the switch directly.

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.

Exterior inspection

Inspect the outside of the oscilloscope for damage, wear, and missing parts. Refer #unique_18/unique_18_Connect_42_T-

EXTERNAL.INSPECTION.CHECKLIST for immediate repair defects that could cause personal injury or lead to further damage to the

oscilloscope.

TBS1000C Series Digital Storage Oscilloscope Service Manual 12

Maintenance

Table 1: External inspection checklist

Item Inspect for Repair action

Front and rear case Cracks, scratches, deformations,and

damaged hardware.

Front-panel knobs Missing, damaged, or loose knobs. Repair or replace missing or defective

Connectors Broken shells, cracked insulation, and

deformed contacts. Dirt in connectors.

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, and damaged connectors.

Repair or replace defective module.

knobs.

Repair or replace defective modules. Clear or wash out dirt.

Repair or replace damaged or missing items, frayed cables, and defective modules.

Interior inspection

To access the inside of the oscilloscope for inspection and cleaning, refer to Parts Lists and Exploded Views in this manual.

Inspect the internal portions of the oscilloscope for damage and wear. Refer Table 2: Internal inspection checklist on page 13 to repair any defects immediately.

If any circuit board is repaired or replaced, check the Table 2: Internal inspection checklist on page 13 to see if it is necessary to adjust the oscilloscope.

CAUTION: To prevent damage from electrical arcing, make sure that circuit boards and components are dry before applying power to the oscilloscope.

Table 2: Internal inspection checklist

Item Inspect for Repair action

Circuit boards Loose, broken, or corroded solder connections.

Burned circuit boards. Burned, broken, or cracked circuit-run plating.

Resistors Burned, cracked, broken, blistered condition. Remove and replace damaged circuit board.

Solder connections Cold solder or rosin joints. Resolder joint and clean with isopropyl alcohol.

Capacitors Damaged or leaking cases. Corroded solder on leads

or terminals.

Wiring and cables Loose plugs or connectors. Burned, broken, or frayed

wiring.

Chassis Dents, deformations, and damaged hardware. Straighten, repair, or replace defective hardware.

Remove and replace damaged circuit board.

Firmly seat connectors. Repair or replace modules with defective wires or cables.

Cleaning procedure interior

To clean the oscilloscope interior, perform the following steps:

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 then wipe with a lint-free cloth

dampened with warm deionized water. A cotton-tipped applicator is useful for cleaning in narrow spaces and on circuit boards.

STOP. If, after performing steps1 on page 13 and2 on page 13, a module is clean on inspection, skip steps3 on page 14,4 on page 14, and5 on page 14. Proceed with step6 on page 14.

TBS1000C Series Digital Storage Oscilloscope Service Manual 13

Maintenance

3. If steps1 on page 13 and2 on page 13 do not remove all the dust or dirt, all modules in the oscilloscope except the Display Module and

Front Panel Module may be spray washed using a solution of 75% isopropyl alcohol.

• During cleaning of the Acquisition board (Main board), make sure that no residue is left in the attenuators. Debris or residue can cause several problems with signal fidelity that cannot be corrected by calibration. When handling the board, avoid handling the attenuators since skin oils may cause problems.

• Extensive cleaning of the Display Module is difficult because water must not be trapped between the display shield and the display. The polarizers integrated into the display degrade with long-term exposure to water. The display shield and display must be replaced as an assembly if significant moisture or debris become trapped inside. Cotton tipped applicators and lint-free rags moistened in isopropyl alcohol and/or deionized water offer the best cleaning with the least opportunity for damage to the assembly.

• The Front-Panel module can be damaged by deposition of film or debris inside the knob encoders. To avoid this, be careful not to drip liquid or blow debris into the encoders.

4. Spray wash dirty parts with the 75% isopropyl alcohol solution and wait 60 seconds for the majority of the alcohol to evaporate.

5. Use hot (49 °C to 60 °C / 120 °F to 140 °F) deionized water to thoroughly rinse the parts.

6. Dry all parts with low-pressure, deionized air.

7. Dry all components and assemblies in an oven or drying compartment using low-temperature (52 °C to 66 °C / 125 °F to 150 °F)

circulating air.

Lubrication

Periodic lubrication is not required for the oscilloscope.

TBS1000C Series Digital Storage Oscilloscope Service Manual 14

Adjustments

There are no customer-performable adjustment procedures (calibrations) for the TBS1000C Series oscilloscopes. Please return the instrument to Tektronix if an adjustment is required. 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 performance of the instrument.

To determine if an adjustment is required, use the Performance Verification procedure in the TBS1000C Series Digital Storage Oscilloscopes Specifications and Performance Verification manual (Tektronix part number 077-1583-xx), available at www.tek.com/

product-support. Adjustment is also required after instrument repair.

TBS1000C Series Digital Storage Oscilloscope Service Manual 15

Replaceable parts

This chapter contains a list of the replaceable modules for the TBS1000C 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

• 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

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.

Module exchange

In some cases you may exchange your module for a remanufactured 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 and select option 2.

New modules

You may purchase replacement modules in the same way as other replacement parts.

Using the replaceable parts list

This section contains a list of the mechanical and/or electrical components that are replaceable for the oscilloscope. Use this list to identify and order replacement parts. The following table describes each column in the parts list.

TBS1000C Series Digital Storage Oscilloscope Service Manual 16

Replaceable parts

Table 3: Replaceable parts list

Column Column name Description

1 Figure & Index Number Items in this section are referenced by figure and

index numbers to the exploded view illustrations that follow.

2 Tektronix Part Number Use this part number when ordering replacement

parts from Tektronix.

3 Qty This indicates the quantity of parts used.

4 Name & Description An item name is separated from the description by a

colon (:). Because of space limitations, an item name may sometimes appear as incomplete. Use the U.S. Federal Catalog handbook H6-1 for further item name identification.

Abbreviations

Abbreviations conform to American National Standard ANSI Y1.1-1972.

Parts lists and exploded views

The following table shows the module-level exploded views of the TBS1000C Series Oscilloscopes. Following each exploded view is the list of components, indexed by the numbers in the figure.

TBS1000C Series Digital Storage Oscilloscope Service Manual 17

Replaceable parts

Table 4: Replaceable parts — (LCD, Front panel, Front case, Power supply, Main board, and Rear case)

Figure and index no. Tektronix part no. Qty. Name and description

-1 850-0435-XX 1 Front case assembly

-2 366-0936-XX 4 Knob (large), Multipurpose

-3 366-0934-XX 3 Knob (small), Position

-4 366-0395-XX 3 Knob (medium), Scale

-5 260-3118-XX 1 Key pad, polymer, front panel

-6 211-1272-XX 7 Front panel board (3X), Display (4X)

-7 870-1650-XX 1 Front panel board

-8 131-6417-XX 1 Contact, Electrical

-9 220-0265-XX 3 BNC nuts

-10 210-1039-XX 3 BNC locking washer

-11 441-2909-XX 1 Chassis, ASSY

-12 211-1273-XX 6 Screw, Threaded

-13 870-1704-XX 1 Main PCB assembly

-14 200-5105-XX 2 Cover, ESD protection

-15 211–1272–XX 12 Screw, Machine, 6-32 X .250L

-16 850-0434-XX 1 Rear case assembly

-17 211–1275–XX 2 Screw, Machined, Threadlocking, 6-32 X .312L

-18 366-0956-XX 1 Power switch push button cap

-19 119-8932-XX 1 AC-DC power supply

-20 850-0449-XX 1 Ferrite assembly

-21 850-0399-XX 1 Display assembly

TBS1000C Series Digital Storage Oscilloscope Service Manual 18

Tektronix TBS1000C Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

List of Tables

Important safety information

General safety summary

Service safety summary

Terms in the manual

Terms on the product

Symbols on the product

Preface

Manual conventions

Related documentation

Maintenance

Inspection and cleaning

General care

Interior cleaning

Exterior cleaning

Exterior inspection

Interior inspection

Cleaning procedure interior

Lubrication

Adjustments

Replaceable parts

Parts ordering information

Part number revision level

Module exchange

New modules

Using the replaceable parts list

Abbreviations

Parts lists and exploded views