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Tektronix HDVG1, Service Manual

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Tektronix HDVG1 Service Manual Download Page 91

Troubleshooting Procedures

HDVG1 HDTV Digital Video Generator Service Manual

5- 17

OT

OV

J2

Indicator LEDs

OI

+5V

Power Supply

board

Line Filter board

Pin 7

OT -- Over temperature

OV -- Over voltage

OI -- Over current

Figure 5- 8: Measuring the battery charging circuit

Use this procedure when

you get the wrong or a

distorted signal on the

output.

Make sure you are using

the correct video standard,

monitoring equipment, and

signal.

No

Yes

Is the signal still

wrong?

Reload test signal

from disk.

HDVG1 Module OK

Replace affected

module.

Figure 5- 9: Flowchart for wrong signal on output

Summary of Contents for HDVG1

Page 1: ...071 0594 51 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 summa...

Page 2: ...nding Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved TEKTRONIX and TEK are registered trademarks of Tektronix...

Page 3: ...ipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inade...

Page 4: ......

Page 5: ...mation Installation 2 1 Preventing Component Damage 2 1 Module Installation 2 2 Signal and Logo Backup and Module Removal 2 8 Functional Overview 2 11 Operating Procedures 2 13 Power On and Select the...

Page 6: ...Removing the Rear Panel 5 7 Replacing the Shield 5 8 Replacing the Rear Panel Connectors 5 8 Troubleshooting Procedures 5 9 Equipment Required 5 9 General Troubleshooting 5 10 Fault Symptom Table 5 11...

Page 7: ...tion 4 9 Figure 4 3 Example of eye pattern for an acceptable output signal 4 10 Figure 4 4 Trigger output check connection 4 11 Figure 5 1 Placing the module in the protective wrapping 5 4 Figure 5 2...

Page 8: ...ertifications and compliances 1 3 Table 2 1 Module slot assignments 2 2 Table 3 1 Supported embedded audio frequencies 3 4 Table 4 1 Equipment required for Performance Verification 4 1 Table 4 2 HDVG1...

Page 9: ...e product ensure that the product is properly grounded Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult the product manual for further...

Page 10: ...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 indicat...

Page 11: ...his product unless another person capable of rendering first aid and resuscitation is present Disconnect Power To avoid electric shock disconnect the mains power by means of the power cord or if provi...

Page 12: ...Service Safety Summary viii HDVG1 HDTV Digital Video Generator Service Manual...

Page 13: ...opriate system that will ensure that most of the materials are reused or recycled appropriately The symbol shown to the left indicates that this product complies with the European Union s requirements...

Page 14: ...Environmental Considerations x HDVG1 HDTV Digital Video Generator Service Manual...

Page 15: ...This manual is composed of the following sections H Specifications provides instrument specifications tables H Operating Information provides basic operating information H Theory of Operation is an o...

Page 16: ...al manual must be ordered separately and is recommended before beginning any troubleshooting H The TG2000 Signal Generation Platform User Manual describes how to use the TG2000 Platform It also contai...

Page 17: ...Specifications...

Page 18: ......

Page 19: ...software package H Three serial digital video outputs H Signal parameters such as active video gain and chroma luma gain are adjustable in real time from the front panel H Rear panel trigger output u...

Page 20: ...rical specifications typical Characteristics Description Serial Connector Number of Outputs 3 BNC Signal Amplitude 800 mV typical into 75 load Data Rate 1 485 Gbps or 1 485 1 001 Gbps nominal Overshoo...

Page 21: ...nnex A Magnetic Immunity Australia New Zealand Declaration of Conformity EMC Complies with EMC provision of Radiocommunications Act per the following standard s AS NZS 2064 1 2 Industrial Scientific a...

Page 22: ...Specifications 1 4 HDVG1 HDTV Digital Video Generator Service Manual...

Page 23: ...Operating Information...

Page 24: ......

Page 25: ...ing removing or handling modules 1 Wear a grounded antistatic wrist strap to discharge the static voltage from your body while installing or removing modules from the TG2000 Platform mainframe 2 Trans...

Page 26: ...ows a sample configuration with slot numbers Table 2 1 Module slot assignments Module Slots in which the module can be installed AGL1 Genlock module Slot 2 or 3 AVG1 Generator module Slots 2 through 1...

Page 27: ...ard always remove the power cord before removing the top cover Failure to remove the power cord can result in serious injury or death 4 Refer to Figure 2 2 and remove or loosen all screws to remove th...

Page 28: ...igure 2 3 Loosen but do not remove the bottom screw You will use it later to secure the module Loosen screw Figure 2 3 Removing the rear panel 6 While ensuring correct alignment of the module flange a...

Page 29: ...le CAUTION The connectors must exactly match before you attempt to press the module firmly in place If the connectors do not match you could bend a pin that could damage the module mainframe or both w...

Page 30: ...ed a module and backed up the instrument perform Instrument Restore from Backup now page 4 12 If this module was installed in the TG2000 Platform mainframe at the factory signal sets are already insta...

Page 31: ...gged total is greater than the amount available the signal sets will not load 9 Touch Start Load The signal sets are automatically loaded into the module A pop up menu tells you when the transfer is c...

Page 32: ...S formatted disk into the platform s disk drive 2 Push the Disk button and touch Save Signals to Disk 3 Touch Select Source and select the HDVG1 Use the cursor arrows to select the HDVG1 module in the...

Page 33: ...plug the power cord can result in serious injury or death 3 Remove all top cover screws and remove the top cover See Figure 2 2 on page 2 3 4 Remove the appropriate rear panel as shown in Figure 2 3 o...

Page 34: ...Installation 2 10 HDVG1 HDTV Digital Video Generator Service Manual...

Page 35: ...rect signal is selected Touch Module Parameters Touch Active Signal Parameters Test Signals window Touch desired module Touch Module Parameters Touch Rename Module Rename Module window Enter new name...

Page 36: ...and one trigger output Serial Outputs Outputs 1 2 and 3 are serial signal outputs BNC Trigger Output The trigger output BNC can be used to trigger an oscilloscope or other video equipment Push the fr...

Page 37: ...Operating Procedures This section is organized into the following main topics H Power on the mainframe and select the module H Select the output signal H Active signal parameters H Module parameters R...

Page 38: ...the generator modules If an installed module is not represented refer to Troubleshooting Procedures starting on page 5 9 NOTE The illustrations in these procedures show the factory default name HDVG1...

Page 39: ...can select any of the HDVG1 signals that are loaded in your instrument 1 Push the Signal Sets button to open the window shown below Check that there is an icon for each installed signal set If your s...

Page 40: ...e signals You can also display the complete list of test signals available under a selected test signal icon by touching the list box or by rotating the Navigation knob and then select a signal by pre...

Page 41: ...indow shown below Changes that you make to parameters in any of these windows affect only the active signal To enter the Active Signal Parameters window for the HDVG1 Generator module follow these ste...

Page 42: ...and save a signal both the original and the modified signals are saved If you modify any signal that was shipped on the factory disks the platform adds an underscore to the front of the name You can...

Page 43: ...have overlaid text Touching Reset returns the text horizontal and vertical to previously saved values Text Overlay is controlled through the Signal Text window shown below Access this window by touch...

Page 44: ...1 HDTV Digital Video Generator Service Manual You can view detailed information about the selected signal in the Signal Information window accessed through the Active Signal Parameters window shown on...

Page 45: ...e entire module To enter the Module Parameters window for the HDVG1 Generator module follow these steps 1 Select the HDVG1 Generator module if not already selected 2 Push the Test Signals button 3 Tou...

Page 46: ...n in the Module Parameters window shown on page 2 21 You can set the horizontal and vertical timing of this module with respect to the BG1 Generator module Changes you make to timing affect all signal...

Page 47: ...nstant regardless of which test signal or video standard you use You can define a circle overlay in the Circle Overlay window accessed through the Module Parameters window shown on page 2 21 The Circl...

Page 48: ...ameters window shown on page 2 21 touch Trigger to enter the Trigger window shown below Turn on the cursor by touching the On Off on the display Touch Reset All if you want to set all the parameters t...

Page 49: ...elect which channel groups to enable and which of the enabled groups to send first You can also adjust the frequency and amplitude of the embedded audio signal Changes you make affect all signals for...

Page 50: ...standard you use You can define a logo overlay in the Logo Overlay window accessed through the Module Parameters window shown on page 2 21 The Logo Overlay window is shown in the following illustratio...

Page 51: ...Theory of Operation...

Page 52: ......

Page 53: ...r the CPU bus An overlay data modifier which is actually an integral part of the fast access memory inserts data from the overlay memory into the fast access memory data stream to create circular patt...

Page 54: ...3 1 Simplified block diagram of the HDVG1 Generator module Signal Memory The HDVG1 module uses two levels of memory to generate signals in real time See Figure 3 2 Each level of memory puts constrain...

Page 55: ...the maximum length in seconds of a video sequence is Line length 174762 maximum sequence length in seconds 1080I 1 30 1125 174762 5 1 seconds 155 Frames 720P 1 60 750 174762 3 8 seconds 233 Frames NOT...

Page 56: ...rate of 48 kHz The data can be made up of multiple frequencies and amplitudes with channel and status independence The supported audio frequencies are listed in Table 3 1 Table 3 1 Supported embedded...

Page 57: ...Performance Verification...

Page 58: ......

Page 59: ...1 Equipment required for Performance Verification Item No Required precision Recommended equipment Digital Television Waveform Monitor 1 Tektronix WFM1125 Option 0C or 0D HDTV Picture Monitor 1 Sony...

Page 60: ...Calibration Data Report Serial Number Cal Date Temperature Humidity Step Function Tested Minimum Cal Data Maximum 1 Serial Output Rise Time 20 to 80 amplitude points Output 1 ps 270 ps Output 2 ps 270...

Page 61: ...e mainframe executes confidence tests on the mainframe and modules Check to see if any error messages appear 5 When the self tests are complete the instrument will display icons represent ing each of...

Page 62: ...le Utilities on the display and then touch Add Sequences from Disk 3 Select the tgbackup seq sequence file and then touch Start Load 4 When you see the message The Load is Complete touch OK 5 Touch Qu...

Page 63: ...connections Use the 75 coaxial cables to make the following connections H Connect OUTPUT 1 connector on the HDVG1 Generator module to the CHA connector on the digital TV waveform monitor rear panel H...

Page 64: ...itor rear panel 75 terminator Pr Pb Y 75 coaxial cable Figure 4 1 SDI correctness and digital audio output check connection Setup Set the digital TV waveform monitor as indicated below Input CH A Disp...

Page 65: ...tform b Touch Module Parameters on the display c Touch Embedded Audio on the display d Touch Group1 on the display e Touch the list box for the channel 1 A list box appears for you to select the desir...

Page 66: ...to OUTPUT 3 connector on the HDVG1 Generator module and repeat step 4 and step 5 Equipment required Two 75 coaxial cables One AMT75 Two SMA to BNC adapters Sampling oscilloscope with sampling head Co...

Page 67: ...connection Setup Set the sampling oscilloscope as indicated below Vertical CH1 Coupling AC Scale 20 mV div Horizontal Sweep 200 ps div Trigger Source External Direct Coupling AC Slope Positive Level 0...

Page 68: ...re 4 3 Example of eye pattern for an acceptable output signal 3 Use the sampling oscilloscope measurement functions to perform the amplitude rise and fall time measurement and check that these values...

Page 69: ...T 2 connector on the HDVG1 Generator module and then connect it to OUTPUT 3 connector on the HDVG1 Generator module 7 Check that OUTPUT 3 eye pattern displayed on the sampling oscilloscope is fully op...

Page 70: ...signal as follows a Touch Module Parameters on the display b Touch Trigger on the display c Touch Type to select Horizontal Vertical or Pixel 3 Use the oscilloscope measurement functions to perform th...

Page 71: ...uit 7 Insert another disk and touch Quit each time you are prompted You can insert the disks in any order 8 When the Restore Complete window appears turn the mainframe power off and then on again to c...

Page 72: ...Performance Verification 4 14 HDVG1 HDTV Digital Video Generator Service Manual...

Page 73: ...Maintenance...

Page 74: ......

Page 75: ...be taken immediately to prevent additional problems NOTE Contact your local Tektronix representative for information on where to return your instrument if it requires repair during the warranty period...

Page 76: ...s or components should only be performed at a static free workstation by qualified personnel H Nothing capable of generating or holding a static charge should be allowed on the workstation surface H K...

Page 77: ...ervice Manual Check module performance after each 2000 hours of operation or every 12 months This will help to ensure maximum performance and assist in locating defects that may not be apparent during...

Page 78: ...e carton If using Styrofoam kernels overfill the box and compress the kernels by closing the lid There should be three inches of tightly packed cushion ing on all sides of the instrument 3 Seal the ca...

Page 79: ...Maintenance HDVG1 HDTV Digital Video Generator Service Manual 5 5 004 4712 00 004 4713 00 2 Each 004 0828 00 Figure 5 2 Placing the module in the shipping carton...

Page 80: ...Maintenance 5 6 HDVG1 HDTV Digital Video Generator Service Manual...

Page 81: ...e T 10 Torx tip Removing the module from the mainframe 9 16 inch box wrench Removing the rear panel Removing the Rear Panel To remove the rear panel from a module perform the following steps 1 Perform...

Page 82: ...shield assembly which includes a metal portion and a plastic portion on a firm flat static free work surface Carefully place the circuit board in place on the shield 5 Install and tighten the eight s...

Page 83: ...d in Table 5 2 is required for troubleshooting Table 5 2 Equipment required for troubleshooting Equipment description Minimum requirements example Torx screwdriver handle Accepts Torx driver bits T 10...

Page 84: ...ring file to help troubleshoot a malfunctioning module NOTE Write the console ring file to disk before performing troubleshooting to prevent the troubleshooting routines from overwriting the console r...

Page 85: ...iagnostics the highest number reached for that module and any error messages H Description of the problem including which troubleshooting flow chart you used Fault Symptom Table Use this fault symptom...

Page 86: ...or does not pass power up confidence tests Does the TG2000 recog nize the HDVG1 module No Yes TG2000 now recognizes the HDVG1 module HDVG1 module now passes power up confidence and self calibration t...

Page 87: ...same slot Set the rear panel power switch to on and then use the front panel switch to turn the instrument on Watch the display for the HDVG1 Confidence Tests Note whether the HDVG1 module passed the...

Page 88: ...st number to appear Note that there may be a problem with the Backplane board Record troubleshooting information and contact Tektronix Continuation of flowchart from page 5 13 Install the HDVG1 module...

Page 89: ...cedure on page 5 7 to remove the HDVG1 module Set the rear panel power switch to off then on and then use the front panel switch to turn the instrument on No Did the mainframe power up successfully Ye...

Page 90: ...e battery charging circuit ok The problem is probably the backup battery but it could be the Backplane board or the CPU module Record troubleshooting information and contact Tektronix No Check that th...

Page 91: ...oltage OI Over current Figure 5 8 Measuring the battery charging circuit Use this procedure when you get the wrong or a distorted signal on the output Make sure you are using the correct video standar...

Page 92: ...re installed For example if you ordered a module separately and added it to your TG2000 Platform mainframe you need to load the signals from the supplied disks Refer to Signal Set Installation on page...

Page 93: ...Option...

Page 94: ......

Page 95: ...cribes option that is available for the HDVG1 Generator module The following option is available H Option D1 ships with test result report Option D1 Description A calibration data test result report w...

Page 96: ...Option 6 2 HDVG1 HDTV Digital Video Generator Service Manual...

Page 97: ...Diagram...

Page 98: ......

Page 99: ...ctions such as power supply and clock can be found in the TG2000 Signal Generation Platform Service Manual A block diagram of the HDVG1 Generator module is located in the Theory of Operation section b...

Page 100: ...Diagram 7 2 HDVG1 HDTV Digital Video Generator Service Manual...

Page 101: ...Replaceable Parts List...

Page 102: ......

Page 103: ...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 Modules can be serviced by sele...

Page 104: ...lacement 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 discont...

Page 105: ...174 4273 XX 3 CABLE ASSY RF 75 OHM COAX 1 5C XV 4CM L BNC TO PL71 LP 1 5C 10 1 4 174 4272 XX 1 CABLE ASSY RF 75 OHM COAX 1 5C XV 8CM L BNC TO PL71 LP 1 5C 10 1 5 333 4335 XX 1 PANEL REAR AL HDVG1 116...

Page 106: ...Replaceable Parts List 8 4 HDVG1 HDTV Digital Video Generator Service Manual 1 5 3 2 4 4 3 Figure 8 1 Exploded view...

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