Tektronix 4 Series Service Manual

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4 Series B MSO

(MSO44B and MSO46B)

Service Manual

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*P 077182300*

077-1823-00

March 2024

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Summary of Contents for Tektronix 4 Series

Page 1 4 Series B MSO (MSO44B and MSO46B) Service Manual Register now! Click the following link to protect your product. tek.com/register *P 077182300* 077-1823-00 March 2024...
Page 2 Copyright © 2024, Tektronix. 2024 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.
Page 3 Troubleshooting................................... 32 Service level................................. 32 Check for common problems............................32 Troubleshooting flow chart............................33 Check that the instrument passes power-on self tests....................34 Download and install the latest instrument firmware.....................34 After repair..................................34 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 4 Contents Replaceable parts..................................35 Rear case assembly with handle and feet........................... 36 Front assembly..................................37 Rear chassis assembly................................ 39 Front panel assembly................................41 Front chassis assembly............................... 43...
Page 5 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.
Page 6 Important safety information 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.
Page 7 Important safety information Use care when lifting and carrying the product. This product is provided with a handle or handles for lifting and carrying. Use only the Tektronix rackmount hardware specified for this product. Probes and test leads Before connecting probes or test leads, connect the power cord from the power connector to a properly grounded power outlet.
Page 8 Important safety information 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.
Page 9 For information on installing, operating, and networking the instrument, refer to the online help or user manual that was provided with your oscilloscope. You can also find the manual at tek.com, by searching for your product. 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 10 This chapter describes the electrical operation of the oscilloscope to the module level. The block diagram shows the oscilloscope module interconnections. Figure 1: 4 Series B MSO block diagram Power supply The Power Supply board converts AC line voltage to +12 V to power for all internal circuits.
Page 11 Processor board. The Front Panel board also generates the probe compensation output signal, provides USB2 ports on the front panel. The PIB routes the digital front-end signals from the probe directly to the main board and houses the main power switch. 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 12 After removal and replacement of any module, you must perform the Performance Verification procedures, found in the Specifications and Performance Verification Manual, available to download from tek.com. If the instrument fails any Performance Verification tests, it must be returned to a Tektronix Service Center for adjustment and calibration.
Page 13 Use a 75% isopropyl alcohol solution as a cleaner for cabinet parts. Before using any other type of cleaner, consult your Tektronix Service Center or representative. Inspection - Exterior. Inspect the outside of the instrument for damage, wear, and missing parts. Immediately repair defects that could cause personal injury or lead to further damage to the instrument.
Page 14 Do not disassemble or clean the front chassis assembly (other than cleaning the front panel display and removing panel knobs). Disassembling the front chassis assembly requires that the instrument be returned to your nearest Tektronix Service Center for calibration. WARNING: To avoid electric shock or damage to the instrument, remove instrument power. Before performing any procedure that follows, power down the instrument and disconnect it from line voltage.
Page 15 To prevent electrostatic damage to components whenever you work on the instrument, wear properly-grounded electrostatic prevention wrist and foot straps, and work in a tested antistatic environment on an antistatic mat. 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 16 Maintenance Remove the front-panel knobs The following procedure describes the removal and replacement of the front-panel knob assemblies. Before you begin To prevent electrostatic damage to components whenever you work on the instrument, wear properly-grounded electrostatic prevention wrist and foot straps, and work in a tested antistatic environment on an antistatic mat. About this task There are eight knob assemblies that can be removed from the front case.
Page 17 To reinstall, reverse the above steps. Use a screwdriver with T-10 Torx tip to secure the eight screws. First insert and tighten the screws that are near the front edge of the instrument, then insert and tighten the screws that are near the rear edge of the instrument. Tighten to 0.65 N·m. 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 18 Maintenance Remove the handle The following procedure describes the removal and replacement of the handle. Before you begin To prevent electrostatic damage to components whenever you work on the instrument, wear properly-grounded electrostatic prevention wrist and foot straps, and work in a tested antistatic environment on an antistatic mat. Procedure 1.
Page 19 2. Put fingers in handle hub holes on both side of the grill and pull the grill from the rear case. 3. Use a screwdriver with T-10 Torx tip to remove the six screws securing the rear case to the rear chassis. 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 20 Maintenance 4. Slide away the rear case from the rear chassis. Results To reinstall, reverse the above steps. Tighten the six T-10 Torx rear case screws to 0.65 N·m.
Page 21 Black arrow is for nut and red arrow is for washer. 2. Use a screwdriver with a with T-10 Torx tip to remove the 25 screws securing the rear chassis to the front chassis. 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 22 Maintenance 3. Carefully lift the rear chassis off of the front chassis and disconnect the power cables, fan cables, and line filter cable. Results To reinstall, reverse the above steps. Tighten the 25 screws with T-10 bit to 0.65 N·m. Secure BNCs with three washers and three nuts using 9/16"...
Page 23 Procedure 1. Set the rear chassis with the rear side down. 2. Use a screwdriver with a with T-10 Torx tip to remove the 15 screws from the power supply bracket. 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 24 Maintenance Results To reinstall, reverse the above steps. Tighten the 15 screws with T-10 bit to 0.65 N·m. to attach the power supply bracket to chassis with the order of the red arrow.
Page 25 1. Flip open the power supply shield. 2. Disconnect the line input cable from the power supply. 3. Use a T-10 Torx screwdriver to remove the two screws from the cable block. 4. Remove the cable block. 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 26 Maintenance 5. Use a T-10 Torx screwdriver to remove the four screws from the power supply. 6. Remove the power supply from the chassis. 7. Disconnect the main board cable from the power supply. 8. Use a Phillips-head screwdriver to remove the two screws securing the power supply cable. 9.
Page 27 Make sure the color of the cable aligns with the letter on the chassis. "R" equals red and "B" equals black. When placing the power supply back into the chassis, place the fan cable as shown in the image below (indicated by the blue dots). 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 28 Maintenance Remove the main fan assembly The following procedure describes the removal and replacement of the power supply bracket. Before you begin • To prevent electrostatic damage to components whenever you work on the instrument, wear properly-grounded electrostatic prevention wrist and foot straps, and work in a tested antistatic environment on an antistatic mat. •...
Page 29 To disconnect the large display cable, flip up the connector clip and slide the cable out of the connector. Results To reinstall, reverse the above steps. Tighten the T-10 Torx screws to 0.65 N·m when reinstalling. After reconnecting the display cables, make sure to lock the cable clip. 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 30 Maintenance Remove the main board The following procedure describes the removal and replacement of the main board. Before you begin • To prevent electrostatic damage to components whenever you work on the instrument, wear properly-grounded electrostatic prevention wrist and foot straps, and work in a tested antistatic environment on an antistatic mat. •...
Page 31 To reinstall, reverse the above steps. Tighten the T-10 Torx screws to 0.65 N·m when reinstalling. Push down at the locations shown in the following image to fully engage the main board connectors. 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 32 This subsection contains information and procedures to help you determine if a faulty power supply is the problem with your instrument. For a faulty power supply, return the instrument to a Tektronix Service Center for repair. Check for common problems Use the following table to help isolate possible failures.
Page 33 Maintenance Troubleshooting flow chart Follow the troubleshooting flow chart to determine the action for a fault condition. Figure 2: Primary troubleshooting tree 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 34 If one or more power-on self tests shows Failed: a) Power cycle the instrument. b) Tap Utility > Self Test. If one or more power-on self tests still shows Failed, contact Tektronix Customer Support. Download and install the latest instrument firmware Installing the latest firmware helps ensure that your instrument has the latest features and is taking the most accurate measurements.
Page 35 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. Module servicing Modules can be serviced by selecting one of the following three options.
Page 36 Replaceable parts Rear case assembly with handle and feet Figure 3: Rear case assembly with handle and feet exploded view Table 6: Rear case assembly parts list Index Part number Serial no. Serial no. Description number effective discont'd 211-1688-XX SCREW, MACHINE, M3X0.5X10, FLAT HEAD 90 DEG, SUS410 NYLOK, TORX T10 050-3906-XX MODULE ASSY:SERVICE REPLACEMENT KIT, HANDLE METAL...
Page 37 TUFLOK, TORX T10 065-1047-XX MODULE ASSY: SERVICE REPLACEMENT KIT; REAR FLIP FEET, MSO4 SERIES 202-0578-XX CASE, REAR, W/BLACK LABELS, MSO4K SERIES, SAFETY CONTROLLED Front assembly Figure 4: Front assembly exploded view 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 38 065-1098-XX MODULE ASSY: SERVICE REPLACEMENT KIT; TOUCHSCREEN-LCD ASSY WITH DISPLAY BRACKET Return the instrument to Tektronix for service. 174-6610-XX CABLE ASSY, DISPLAY-FRONT PANEL Return the instrument to Tektronix for service. 174-7445-XX CABLE ASSEMBLY, TOUCH SCREEN CONTROLLER 5 PIN Return the instrument to Tektronix for service.
Page 39 FAN ASSEMBLY, SAN ACE 9GA0812P4J0011 W/ TERMINATION, SAFETY CONTROLLED 407-6151-XX BRACKET, 2 FANS 348-2082-XX GROMMET, FAN MOUNT, NOISE DAMPING 220-0346-XX SUPPORT, PS OUT PUT CABLE 441-2957-XX CHASSIS, REAR, SAFETY CONTROLLED Table continued… 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 40 Replaceable parts Index Part number Serial no. Serial no. Description number effective discont'd 335-4598-XX LABEL, REAR, IO, TOP 335-4541-XX LABEL, REAR, IO, BOTTOM 211-1708-XX SCREW, MACHINE, M3 X 0.5 X 5L FLATHEAD 90 DEG, NYLOK, TORX 119-8742-XX FILTER, EMI; AC LINE FILTER;10.0A,120-250VAC,DC-400 HZ, IEC INPUT,FAST-ON/SOLDER LUG OUTPUT,CHASSIS MOUNT;...
Page 41 Front panel assembly Figure 6: Front panel assembly exploded view Note: None of the components listed are user-replaceable. Return the instrument to your nearest Tektronix Service Center to repair or replace any internal components or assemblies in this diagram. 4 Series B MSO (MSO44B and MSO46B) Service Manual...
Page 42 Description number effective discont'd 202-0564-XX CASE, FRONT Return the instrument to Tektronix for service. BUTTON, POWER SWITCH, SAFETY CONTROLLED 366-0920-XX Return the instrument to Tektronix for service. 065-1053-XX MSO44B: MODULE ASSY, SERVICE REPLACEMENT KIT, 4CH PROBE INTERFACE WITH VPI BUCKETS Return the instrument to Tektronix for service.
Page 43 Front chassis assembly Figure 7: Front chassis assembly exploded view Note: None of the components listed are user-replaceable. Return the instrument to your nearest Tektronix Service Center to repair or replace any internal components or assemblies in this diagram. Table 10: Front chassis assembly...
Page 44 878-1937-XX MSO46B: CIRCUIT BOARD ASSY; 6 CH MAIN, 3895679XX Return the instrument to Tektronix for service. MSO44B: CIRCUIT BOARD ASSY; 4 CH MAIN, 3895679XX 878-1938-XX Return the instrument to Tektronix for service. 211-1584-XX SCREW, MACHINE, M3X0.5X6 MM PAN HEAD, TORX T10...

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