Tektronix 1741C Service Manual
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Tektronix 1741C Service Manual

Tektronix 1741C Service Manual

Waveform monitor
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1741C
Waveform Monitor
ZZZ
Service Manual
*P077015502*
077-0155-02

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Summary of Contents for Tektronix 1741C

  • Page 1 1741C Waveform Monitor Service Manual *P077015502* 077-0155-02...
  • Page 3 1741C Waveform Monitor Service Manual 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.
  • Page 4 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.
  • Page 5 Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.

  • Page 7: Table Of Contents

    Front Panel ....................Composite Input ..................... Fan Control ....................Power Supply and Distribution................Adjustment Procedures Adjustments ....................... Required Equipment..................Procedures ....................Maintenance General Maintenance..................... Preventing ESD ....................Inspection and Cleaning..................Troubleshooting....................Detailed Troubleshooting Procedures ..............1741C Waveform Monitor Service Manual...
  • Page 8 Removal and Replacement Procedures ..............4-16 Preparation....................4-16 Module Removal................... 4-17 Repackaging Instructions ..................4-24 Packaging ....................4-24 Shipping to the Service Center ................4-24 Replaceable Parts Replaceable Parts ....................Parts Ordering Information ................. Using the Replaceable Parts Lists................1741C Waveform Monitor Service Manual...
  • Page 9 4-21 Figure 4-4: LCD assembly bracket and backlight lock ............ 4-22 Figure 4-5: Backlight removal ................4-23 Figure 5-1: Circuit boards and connectors..............Figure 5-2: Chassis components ................Figure 5-3: Main board replaceable components ............. 1741C Waveform Monitor Service Manual...
  • Page 10 Table 4-8: Module removal ................... 4-17 Table 5-1: Replaceable parts list (See Figure 5-1.) ............Table 5-2: Chassis components (See Figure 5-2.) ............Table 5-3: Replaceable parts list (See Figure 5-3.) ............Table 5-4: Replaceable parts list ................5-10 1741C Waveform Monitor Service Manual...

  • Page 11: General Safety Summary

    Replace batteries properly. Replace batteries only with the specified type and rating. Use proper fuse. Use only the fuse type and rating specified for this product. Wear eye protection. Wear eye protection if exposure to high-intensity rays or laser radiation exists. 1741C Waveform Monitor Service Manual...
  • Page 12 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. The following symbol(s) may appear on the product: 1741C Waveform Monitor Service Manual...

  • Page 13: Service Safety Summary

    Use Care When Servicing With Power On. 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. To avoid electric shock, do not touch exposed connections. 1741C Waveform Monitor Service Manual...
  • Page 14 Service Safety Summary viii 1741C Waveform Monitor Service Manual...

  • Page 15: Preface

    Preface This manual supports servicing to the module level of the 1741C Waveform Monitor, which processes video signals for display on an internal XGA LCD. The instrument finds use as a monitor for broadcasting, production, and post-production environments. This manual explains how to troubleshoot and service the monitor to the module level.

  • Page 16: Related Manuals

    These manuals ship with the product and are also downloadable from the Tektronix Web site. Table i: Related documentation Item Purpose Location 1741C Waveform Monitor Quick Start Installation and high-level operational overview User Manual 1741C Waveform Monitor Specifications Procedure for checking performance and and Performance Verification...

  • Page 17: Introduction

    Introduction...

  • Page 19: Service Strategy

    (See page x, Related Manuals.) Options and Accessories The lists of options and accessories for this product are found in the 1741C Waveform Monitor Quick Start User Manual that ships with the product. (See page x, Related Manuals.) Configurations...

  • Page 20: Hardware Installation

    You can also install the waveform monitor in a custom installation, such as a console. For installation instructions, refer to the 1741C Waveform Monitor Quick Start User Manual.

  • Page 21: Theory Of Operation

    Theory of Operation...
  • Page 23 Theory of Operation The 1741C is an Analog Composite waveform monitor with four input channels. The monitor uses an internal XGA monitor for the display, and has an output to drive an external XGA monitor with the same display. It has outputs to drive serial digital and analog picture monitors.

  • Page 24: Figure 2-1: Main Block Diagram

    Theory of Operation Figure 2-1: Main block diagram 2–2 1741C Waveform Monitor Service Manual...

  • Page 25: Main Board

    LTC inputs come from the remote connector. The LTC signal is applied to an A/D converter and then input to the waveform processing FPGA, which decodes the time code information. NOTE. The FPGAs decode VITC signals digitally. 1741C Waveform Monitor Service Manual 2–3...

  • Page 26: Front Panel

    Fuses on the Primary supply 5 V output protect the Main board. The secondary supplies and their tolerances are specified in the troubleshooting section. The location of the supply test points is shown in the Maintenance section. 2–4 1741C Waveform Monitor Service Manual...

  • Page 27: Adjustment Procedures

    Adjustment Procedures...

  • Page 29: Adjustments

    Download the PVCustomSignals.zip file, unzip it, and install the signals on your TG2000. Note that the 067-0465-00 (AVC1) is not available outside of Tektronix. Other equipment can be substituted but it might not have sufficient accuracy to guarantee the specifications. For hum insertion, a general-purpose sine wave generator can be used to terminate and drive back into the video signal through appropriate impedance matching.

  • Page 30: Procedures

    1. Push Input A to select the Composite A signal. 2. Push the Config button. 3. Select Utilities > Calibration, and then push SEL to enter the calibration menu. 4. Navigate to Composite DC Offset and push SEL to automatically adjust the offset. 3–2 1741C Waveform Monitor Service Manual...
  • Page 31 7. Follow the instructions at the bottom of the screen to Save and Exit calibration mode. 8. Move the Multiburst signal to the Composite C input and terminate the loop through with a precision 75 Ω terminator. 1741C Waveform Monitor Service Manual 3–3...
  • Page 32 Channel A color bar vectors. 5. Follow the instructions at the bottom of the screen to Save and Exit calibration mode. This ends the adjustment procedure. To complete the process you should now perform a complete Performance Verification. 3–4 1741C Waveform Monitor Service Manual...

  • Page 33: Maintenance

    Maintenance...

  • Page 35: General Maintenance

    Service static-sensitive modules only at a static-free work station. 4. Nothing capable of generating or holding a static charge should be allowed on the work station surface. 5. Handle circuit boards by the edges when possible. 1741C Waveform Monitor Service Manual 4–1...

  • Page 36: Inspection And Cleaning

    Use a glass cleaner to clean the LCD. For the rest of the instrument, 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.

  • Page 37: Table 4-1: External Inspection Check List

    Circuit boards Loose, broken, or corroded Remove and replace solder connections. damaged circuit board. Burned circuit boards. Burned, broken, or cracked circuit-run plating. Resistors Burned, cracked, broken, Remove and replace blistered condition. damaged circuit board. 1741C Waveform Monitor Service Manual 4–3...
  • Page 38 5. Spray wash dirty parts with the isopropyl alcohol and wait 60 seconds for the majority of the alcohol to evaporate. 6. Dry all parts with low-pressure, deionized air. Lubrication. There is no periodic lubrication required for the waveform monitor. 4–4 1741C Waveform Monitor Service Manual...

  • Page 39: Troubleshooting

    A good first step is to recall the Factory Presets. To properly test a waveform monitor you must have appropriate signal sources. For the 1741C you will need a Composite video source. In some cases, you may also need receivers or an oscilloscope to check outputs.

  • Page 40: Table 4-3: Required Test Equipment

    Run Advanced Diagnostics and look for other information Main Board Sensor Replace the Main board Main Board Serial EEPROM Main Board Serial FLASH DSP FPGA A/B COMM DSP FPGA A/B Program Display FPGA COMM Display FPGA Program 4–6 1741C Waveform Monitor Service Manual...
  • Page 41 DSP2 Data Bus DSP2 Address Bus DSP1 QDR1 DSP1 QDR2 DSP2 QDR1 DSP2 QDR2 RD SDRAM Data RD SDRAM Address DSP1 SDRAM Data Bus DSP1 SDRAM Address Bus DSP2 SDRAM Data Bus DSP2 SDRAM Address Bus 1741C Waveform Monitor Service Manual 4–7...
  • Page 42 Cmpst Ref Clk Sel Display Cmpst Ctrls DSP1 Cpmst Tests DSP2 Cpmst Tests No text or traces on LCD Perform LCD troubleshooting test Traces on LCD but not on Ext Replace Main board Display output 4–8 1741C Waveform Monitor Service Manual...

  • Page 43: Detailed Troubleshooting Procedures

    final recommendation identifying a root cause might be suspect. List of detailed troubleshooting procedures: General Checks Primary Power Supply Checks Secondary Power Supplies Checks 1741C Waveform Monitor Service Manual 4–9...
  • Page 44 5 V . The output voltage at the supply must be between 4.9 and 5.3 V for correct operation. On the Main board, the common 5 V supply must be between 4.80 and 5.25 V. 4–10 1741C Waveform Monitor Service Manual...
  • Page 45 Next, check the secondary supplies as shown in Table 4-5. Each supply has a test point in the front left corner of the Main board. (See Figure 4-1 on page 4-15.) If any supplies are out of range, replace the Main board. 1741C Waveform Monitor Service Manual 4–11...

  • Page 46: Table 4-5: Main Board Secondary Supplies

    LCD, turn the power off and on and you should be able to see the backlight come on. It may help to be in a low light area to see the backlight. 4–12 1741C Waveform Monitor Service Manual...
  • Page 47 However, any larger steps or any non-monotonic regions indicate a problem. Check the cable to the LCD, perform the LCD diagnostic procedure, or replace the display assembly. It is also possible for the Main board to cause problems in this area. 1741C Waveform Monitor Service Manual 4–13...

  • Page 48: Table 4-6: Advanced Diagnostic Measurements

    General Maintenance Table 4-6: Advanced diagnostic measurements Measurement VGA Clock 64.4375 MHz 64.4575 MHz QDR Clock 25.1650 MHz 25.1850 MHz 20.4 μs 20.8 μs HSYNC PW VSYNC PW 18974.9 μs 19174.9 μs 4–14 1741C Waveform Monitor Service Manual...

  • Page 49: Figure 4-1: Main Board Power Supply Test Points And Leds

    General Maintenance Figure 4-1: Main board power supply test points and LEDs 1741C Waveform Monitor Service Manual 4–15...

  • Page 50: Removal And Replacement Procedures

    Table 4-7: Tools required for module removal Item General Tool Name Description number Torque driver handle Accepts inch hex bits 620-440 640-235 T10 TORX tip Used for removing most instrument screws. TORX-driver bit for T10 size screw heads 4–16 1741C Waveform Monitor Service Manual...

  • Page 51: Module Removal

    Table 4-8: Module removal To remove Power You must first remove Composite supply Main Front panel LCD assy Top cover Board supports Composite boards Main board Power supply Fan assembly Front panel LCD assembly 1741C Waveform Monitor Service Manual 4–17...
  • Page 52 8 in/lb. 5. Lift the power supply out of the chassis. 6. Disconnect the line filter cable from J1 on the power supply. 7. Disconnect the power cable from J2 on the power supply. 4–18 1741C Waveform Monitor Service Manual...
  • Page 53 USB connectors, until they clear the LCD bracket. 3. Disconnect the cables connecting the Front panel/LCD assembly to the Main board at J17, J18, and J29. (See Figure 4-2 on page 4-20.) 1741C Waveform Monitor Service Manual 4–19...

  • Page 54: Figure 4-2: Front Panel Cable Connections

    When reinstalling, torque these screws to 4 in/lb. 6. Use a spudger or other tool to pry the bezel clips away from the bracket and then pull the bezel away, leading the front panel cable through the cutout in the bracket. 4–20 1741C Waveform Monitor Service Manual...

  • Page 55: Figure 4-3: Front Panel Disassembly

    3. Remove the two screws attached to the right-hand bracket of the LCD display assembly. The right-hand bracket is on the right when the assembly is facing you as shown. (See Figure 4-4.) When reinstalling, torque these screws to 1.0 in/lb. 1741C Waveform Monitor Service Manual 4–21...

  • Page 56: Figure 4-4: Lcd Assembly Bracket And Backlight Lock

    CAUTION. To prevent damage, do not bend the flex circuitry. Carefully remove the flex circuit from the metal guides and connector latch. 4–22 1741C Waveform Monitor Service Manual...

  • Page 57: Figure 4-5: Backlight Removal

    Figure 4-5: Backlight removal 7. Carefully remove the flex circuit from the metal guides. 8. Pull the backlight straight out (to the right) from the assembly. 9. To remove the other backlight, repeat the previous four steps. 1741C Waveform Monitor Service Manual 4–23...

  • Page 58: Repackaging Instructions

    Type and serial number of the instrument. Reason for returning. A complete description of the service required. Mark the address of the Tektronix Service Center and the return address on the shipping carton in two prominent locations. 4–24 1741C Waveform Monitor Service Manual...

  • Page 59: Replaceable Parts

    Replaceable Parts...

  • Page 61: Parts Ordering Information

    For more information about the module exchange program, call 1-800-833-9200. Outside North America, contact a Tektronix sales office or distributor; see the Tektronix Web site for a list of offices: www.tektronix.com. Module Repair and Return. You may ship your module to us for repair, after which we will return it to you.

  • Page 62: Using The Replaceable Parts Lists

    Using the Replaceable Parts Lists This section contains lists of the mechanical and/or electrical components that are replaceable for the 1741C Waveform Monitor. Use this list to identify and order replacement parts. The following table describes each column in the parts list.
  • Page 63 SCREW,MACHINE; 6-32 X 0.250,PNH,STL,CDPL,T-15 TORX DR 220-0497-00 NUT,PLAIN,HEX; 0.5-28 X 0.562 HEX,BRS CD PL 210-1039-00 WASHER,LOCK; 0.521 ID,INT,0.025 THK,SST 333-4578-00 REAR PANEL, SAFETY CONTROLLED, 1741C 131-3378-00 CONN,RF,JACK; BNC,50 OHM,FEMALE,RTANG,PCB/REAR PNL,0.5-28 THD,0.625 H X 0.187 TAIL,W/O MTG FLANGE,W/MTG POSTS,METAL BODY 1741C Waveform Monitor Service Manual...

  • Page 64: Figure 5-1: Circuit Boards And Connectors

    Replaceable Parts Figure 5-1: Circuit boards and connectors 5–4 1741C Waveform Monitor Service Manual...

  • Page 65: Table 5-2: Chassis Components (See Figure 5-2.)

    407-5314-00 BRACKET; DISPLAY MOUNTING,FRONT,SAFETY CONTROLLED 150-0335-00 LAMP; BACKLIGHT ASSY, LED, REPLACEMENT FOR 119743900 6.5 LCD DISPLAY 850-0097-00 FRONT PANEL ASSY; MODULE; 1741C, TESTED 129-1636-00 SPACER POST: 4-40M/F,0.687L,SST,0.188HEX 174-5492-00 CABLE ASSEMBLY, 10 PIN; FP TO MAIN 863-0262-00 CIRCUIT BD SUBASSY;389410200;FP;ROHS COMPLIANT 311-2580-00 PB-FREE;ENCODER;...
  • Page 66 Name & description index number effective discont’d number 211-1050-00 SCREW,MACHINE; 6-32 X 0.312 L,PNH,STL CAD PLT,T15 131-6521-00 CONTACT,ELEC; EMI,CLIP-ON,0.38 L X 0.500 W (2 CONTACTS) X 0.45 H,ELECTROLESS NICKEL PLATE 407-4999-00 BRACKET; FAN MOUNTING,0.050 AL,SAFETY CONTROLLED 5–6 1741C Waveform Monitor Service Manual...

  • Page 67: Figure 5-2: Chassis Components

    Replaceable Parts Figure 5-2: Chassis components 1741C Waveform Monitor Service Manual 5–7...

  • Page 68: Table 5-3: Replaceable Parts List (See Figure 5-3.)

    10CM AT 3V P-P, FREQ 3.5-5.5KHZ,PKG DIA 13 MM X 7.8 MM H,5.0MM PIN SPACING,NOT MACHINE WASHABLE;PKM13EPY-4000-TF01 159-5003-00 FUSE,THRM,CHIP; SELF RESETTING FUSE,1.1A HOLD,2.2A TRIP AT 20 DEG C,30V MAX,SAFETY CONTROLLED 159-5014-00 FUSE; 2.0A,125V,FAST BLOW,0.1 X 0.1 X 0.24,UL REG,CSA CERT,SAFETY CONTROLLED 5–8 1741C Waveform Monitor Service Manual...

  • Page 69: Figure 5-3: Main Board Replaceable Components

    Replaceable Parts Figure 5-3: Main board replaceable components 1741C Waveform Monitor Service Manual 5–9...

  • Page 70: Table 5-4: Replaceable Parts List

    CABINET; PORTABLE CABINET WITH HANDLE,FEET,TILT BAIL AND FRONT PANEL COVER 200-4716-00 COVER,FRONT; PROTECTIVE,PC/ABS FR110,TV GRAY WFM7F05 RACK ADAPTER; DUAL SIDE BY SIDE 077-0155-xx SERVICE MANUAL, PDF ONLY, 1741C 077-0152-xx SPECIFICATIONS & PERFORMANCE, PDF ONLY, 1741C 5–10 1741C Waveform Monitor Service Manual...

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