TBS2000B Series Digital Storage Oscilloscopes Service Manual Register now! Click the following link to protect your product. www.tek.
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Table of Contents Table of Contents List of Figures................................................................................................................................................................................5 List of Tables................................................................................................................................................................................. 6 Important safety information............................................................
Table of Contents Parts ordering information....................................................................................................................................................24 Part number revision level............................................................................................................................................ 24 Module servicing..................................................................................................................................
List of Figures List of Figures Figure 1: TBS2000B block diagram (2 channel)......................................................................................................................... 12 Figure 2: TBS2000B block diagram (4 channel)......................................................................................................................... 13 Figure 3: Primary troubleshooting procedure flowchart........................................................................................
List of Tables List of Tables Table 1: External inspection checklist......................................................................................................................................... 17 Table 2: Internal inspection checklist...........................................................................................................................................18 Table 3: Parts list column descriptions...................................................................................
Important safety information Important safety information This manual contains information and warnings that must be followed by the user for safe operation and to keep the product in a safe condition. To safely perform service on this product, 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.
Important safety information Avoid exposed circuitry Do not touch exposed connections and components when power is present. Do not operate with suspected If you suspect that there is damage to this product, have it inspected by qualified service personnel. failures 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.
Important safety information Connect and disconnect properly 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. Inspect the probe and accessories Before each use, inspect probe and accessories for damage (cuts, tears, or defects in the probe body, accessories, or cable jacket).
Preface Preface This service manual provides information that you need to troubleshoot, disassemble, and replace parts on the following Tektronix oscilloscopes: Model Bandwidth Channels TBS2072B 70 MHz 2 TBS2102B 100 MHz 2 TBS2202B 200 MHz 2 TBS2074B 70 MHz 4 TBS2104B 100 MHz 4 TBS2204B 200 MHz 4 Manual conventions This manual uses certain conventions that you should become familiar with before performing service.
Ordering information Ordering information For information on installing and operating your oscilloscope, refer to the TBS2000B Series Digital Storage Oscilloscopes User Manual (Tektronix part number 077-1525-xx English; other languages available), which is downloadable from the Tektronix Web site (www.tek.com/ downloads).
Theory of operation Theory of operation This chapter describes the electrical operation of the oscilloscope to the module level. The block diagrams shows the oscilloscope module interconnections.
Theory of operation Figure 2: TBS2000B block diagram (4 channel) Power supply The Power Supply board converts AC line voltage to +12 V to power for all internal circuits. Front End assembly (4 channel models) The Front End assembly begins with the analog signal path and ends with differential mode channel signals which are passed to the Main board. The analog inputs, attenuators, and preamps are contained in this assembly.
Theory of operation Power subsystem The Main board converts the +12 V power to +5 V, -5 V, +3.3 V, +2.5 V, +2 V, +1.8 V, +1.5 V, +1.1 V, 1 V, and 0.75 V, used by circuitry throughout the system. The Front Panel board is powered on at all times when AC power is connected to the unit. I/O ports (2 channel models) The Main board provides USB ports (Host and Device), an Ethernet port (LAN), and an Aux Out trigger output connections.
Adjustments Adjustments Adjustments There are no customer-performable adjustment procedures (calibrations) for the TBS2000B Series oscilloscopes. Please return the instrument to Tektronix if 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.
Maintenance Maintenance This section contains the information needed to do periodic and corrective maintenance on the oscilloscope, and 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, as well as the following ESD information. CAUTION: Electrostatic discharge (ESD) can damage any semiconductor component in this instrument.
Maintenance • • Do not spray liquids directly on the display surface. Do not scrub the display with excessive force. CAUTION: To prevent getting moisture inside the instrument during external cleaning, do not spray any cleaning solutions directly onto the screen or instrument. Exterior cleaning 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.
Maintenance • • Inspect the internal portions of the instrument for damage and wear. See Table 2 on page 18. Defects should be repaired immediately. If any circuit board is repaired or replaced, you must perform the Performance Verification procedure in the specifications and performance verification manual, which was provided with your instrument. This manual is also available at www.tektronix.com/ manuals, by searching for your product name.
Maintenance To remove modules About this task • • • To remove any of the instrument modules or assemblies, you must first remove the rear cover and separate the front chassis from the rear chassis. To remove the Front Panel board assembly or the front panel case assembly, you must first remove the Main 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.
Maintenance Primary troubleshooting flowchart Figure 3: Primary troubleshooting procedure flowchart TBS2000B Series Digital Storage Oscilloscopes Service Manual 20
Maintenance AC Power Supply module troubleshooting flowchart Figure 4: AC Power Supply module troubleshooting Note: Images show the power supply cable disconnected from the main board, to better show the test point locations. The power cable from the Power Supply must be connected to the Main board to test the +12 VDC value.
Maintenance Board isolation troubleshooting flowchart Figure 5: Board isolation troubleshooting flowchart Failed test Most likely board CPU Main Display Main Acquisition Main (or Front End board on 4-channel models) ROM Main Front Panel Front Panel or Main I/O Main (or I/O board on 4-channel models) Unpacking and repacking instructions This section contains the information needed to unpack the oscilloscope and repack it for shipment or storage.
Maintenance Repacking 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.
Replaceable parts Replaceable 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.
Replaceable parts Table 3: Parts list column descriptions 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 and 4 Serial number 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.
Replaceable parts Table 4: Four-channel model parts: front panel, display, and front chassis Fig. & index number Tektronix part number Serial no. Serial no.
Replaceable parts Fig. & index number Tektronix part number Serial no. Serial no.
Replaceable parts Figure 7: Four channel models; rear half Table 5: Four-channel model parts: inputs, main board, power supply, I/O, rear chassis, rear cover Fig. & index number Tektronix part number Serial no. Serial no. Qty1 effective discont'd Name & description 5-2-1 174-6877-xx 1 CABLE POWER SUPPLY WITH MAIN BOARD, SAFETY CONTROLLED -2 211-1272-xx 432 SCREW, MACHINE; 6-32 X 0.
Replaceable parts Fig. & index number Tektronix part number Serial no. Serial no. Qty1 effective discont'd Name & description -10 211-0718-xx 2 SCREW, MACHINE; 6-32 X 0.
Replaceable parts Figure 8: Two channel models; front half Table 6: Two-channel model parts: front panel, display, and front chassis Fig. & index number Tektronix part number Serial no. Serial no.
Replaceable parts Fig. & index number Tektronix part number Serial no. Serial no.
Replaceable parts Figure 9: Two channel models; rear half Table 7: Two-channel model parts: power supply, main board, AC connector/filter, rear cover Fig. & index number Tektronix part number Serial no. Serial no. Qty1 effective discont'd Name & description 5-4-1 119-8488-xx 1 POWER SUPPLY; AC-DC, INTERNAL; 90-264 VAC 47-63 HZ, 103-127 VAC, 360-440 HZ IN; +12V 5A4, 65W OUT; SAFETY CONTROLLED -2 211-1272-xx 432 SCREW, MACHINE; 6-32 X 0.
Replaceable parts Fig. & index number Tektronix part number Serial no. Serial no. Qty1 effective discont'd Name & description -10 348-1909-xx 2 FOOT REAR; SAFETY CONTROLLED -11 348-2209-xx 2 FOOT, FRONT CABINET, HINGED, SAFETY CONTROLLED -12 214-5148-xx 2 SPRING FRONT FOOT -13 131-6643-xx 4 CONTACT, ELECTRICAL -14 220-0265-xx 3 NUT, PLAIN, HEX; 0.5-28 X 0.
