THOMSON ITC222 Technical Training Manual Download | Manualshive

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ITC222

C

ONVERGENCE

& G

EOMETRY

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RED OUTPUT

194V

TP50

TO

E8

RED BIAS

<21-B>

E5003

E5007

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GRN BIAS

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VERTICAL

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TP24

TECHNICAL TRAINING

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Summary of Contents for ITC222

Page 1: ...0 1 0 1 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 0 1 RED OUTPUT 194V TP50 TO E8 RED BIAS 21 B E5003 E5007 TO E7 GRN BIAS 0 1 1 0 0 0 0 1 1 1 0 VERTICAL 1 1 1 0 TP24 TECHNICAL TRAINING 0 1 1...

Page 2: ......

Page 3: ...his manual is as accurate as possible at the time of publication Circuit designs and drawings are subject to change without notice SAFETY INFORMATION CAUTION Safety information is contained in the app...

Page 4: ...t is understood which procedures are required and leave other alignments alone Changing alignments that do not need to be done will always complicate the procedures required Appendix A Chipper Check f...

Page 5: ...N ASSIGNMENTS 22 CONVERGENCE TEMPLATE DESIGN 23 STRING CALCULATIONS 24 LEVEL 2 CONVERGENCE ALIGNMENT 25 LEVEL 3 CONVERGENCE ALIGNMENT 26 Hints Tricks 29 Appendix A Chipper Check 32 SSB MODULE REPLACEM...

Page 6: ...ee CRT s But if Geometry is misadjusted convergence may not have enough power to overcome it and proper convergence would be in jeopardy There are two steps to the Autoconvergence routine Sensor Calib...

Page 7: ...replacement to the existing CRTs See the section on Geometry for more detailed centering ring alignments 4 This completes the CRT mechanical alignments Electrical adjustments should not be required 5...

Page 8: ...suspect geometry errors particularly if failure occurs on the first red sensors If all red sensors are located properly it indicates geometry is most likely OK but gross convergence errors are causin...

Page 9: ...weakens and adjustment returns If convergence was never acceptable pull up the convergence pattern and observe it for gross errors in small portions of the screen or in only one color If errors affect...

Page 10: ...nd area convergence stops on and work on that specific area The ITC222 service adjustments are forgiving In most cases it is not necessary to store adjustments immediately The service menu will rememb...

Page 11: ...attern will appear similar to the following picture of an ITC222 instrument at the end of the production facility Some enhancement has been done to highlight the onscreen pattern The display represent...

Page 12: ...ange the video input a different scan mode could be entered Pay attention to which scan mode is currently being adjusted and make certain that scan mode is not accidently changed The geometry service...

Page 13: ...e service menu select Convergence Adjustments Defaults and select the R G B Default This loads the default convergence alignments 5 Return to the Tube menu and make certain the correct Tube Type is se...

Page 14: ...menu from the standby mode by pressing and holding CH DN and VOL DN for more than 8 seconds 3 Select the proper input by pressing the Input button on the remote until the desired signal is onscreen o...

Page 15: ...the convergence amplifiers Turn the set back on enter the service menu and proceed to the Horizontal Position alignment Horizontal Position Enter the Geometry Menu and select Horizontal Position With...

Page 16: ...e That point should bump the frame very closely as shown Remember that while the pattern may not exactly match the one below it should appear very similar Geometry and later convergence procedures are...

Page 17: ...e the effect of each geometry adjustment on the raster Keep in mind the proper way to adjust geometry in the ITC222 is to make small adjustments using a test pattern with known centerlines and outer b...

Page 18: ...l correct and location is centered Vertical Linearity H Position Adjusts the right left video location on the raster Since this affects video rather than raster it should not be adjusted until geometr...

Page 19: ...s of the pattern to provide equal amplitude on the top and bottom EW Amplitude EW Trap Adjusts the EW tilt of the raster Adjust for raster appearance closest to the template EW Trap EW Symmetry Adjust...

Page 20: ...s right left location Adjust for raster appearance closest to the template EW Lower Corners H Parallel Adjusts the right left sides to be parallel Adjust for raster appearance closest to the template...

Page 21: ...tly adjusted for geometry Remember that geometry cannot create a perfect pattern but aligning the pattern to appear similar to the patterns shown will allow sensor calibration and autoconvergence to o...

Page 22: ...isturbed this screen may be used to quickly bring the remaining convergence patterns close Level 2 adjustments will never return convergence to consumer acceptable appearance but may reduce the total...

Page 23: ...the onscreen pattern to the template If the mylar templates are unavailable a simple string pattern may be used Using a few strings math a measuring device masking tape carpenters string and a formula...

Page 24: ...EEN HEIGHT The centerlines should be marked and the first two strings representing the exact centerlines of the visible picture area placed on the screen All further measurements will be calculated in...

Page 25: ...should appear similar to the diagram LEVEL 2 CONVERGENCE ALIGNMENT Remember all geometry alignment must be done prior to any convergence procedures Level 2 is the highest level of adjustment recommen...

Page 26: ...tation is on the outermost DAC adjustment values The DAC s have a full adjustment range of 255 steps designated differentially from 127 0 127 However the outermost 10 DAC range is limited reducing the...

Page 27: ...bration fails after moving the centering rings compromise the original movement until it completes successfully once again Once the amplifiers regain additional range convergence may proceed The same...

Page 28: ...evel 2 and Level 3 add two patterns A full green grid allows course adjustment of the green pattern in Level 2 and fine tuning in Level 3 There is also a full grid with all three colors available The...

Page 29: ...nce and move the alignment points to their proper location Go to only those points that appear to be wrapped or otherwise distorted and straighten them At this point ignore proper convergence Just mak...

Page 30: ...ove the alignment point The microprocessor changes the alignment points by readjusting the register values in the DAC based on its own algorithm It really doesn t know exactly where the points are exc...

Page 31: ...interaction between the points Following a route that irons out alignments following a spiral pattern from interior to exterior shown below tends to minimize cross influence of the alignment values OF...

Page 32: ...nt time by greater than 50 SSB EEPROM DATA REPLACEMENT If troubleshooting efforts require changing the SSB note all convergence geometry and color temperature setups are located on that board stored i...

Page 33: ...nder that title The procedures are identical except a default file provided by Chipper Check will be used instead of one from the original SSB NOTE It is always a good idea to store the original align...

Page 34: ...per Check connector from the chassis and change the SSB board NOTE Chipper Check does not have to be shut down Simply leave it in its current state 7 Using an alligator clip or jumper wire enable EEPR...

Page 35: ...er Check connector from the chassis then change the SSB board Shut the Chipper Check software down 10 Using an alligator clip or jumper wire enable EEPROM writing by shorting the two pins of BK200 tog...

Page 36: ...4 Now select Store and place a checkmark in Store Defaults This places the stored settings from the EEPROM transfer into the current mode EEPROM 5 Selectsensorcalibrationbyplacingacheckmarkin SensorC...

Page 37: ...chassis NOTE It is suggested to fill out the information screen with at least a model and serial number and save the information for possible future use 7 Enter the EEPROMs tab and select Replace SSB...

Page 38: ...rmed using this menu Its only function is menu description and a gateway to either more text menus or alignment screens Alignment screens are where button presses are translated into real alignments G...

Page 39: ...el only has the Channel Volume OK Menu and Power buttons The navigation buttons shown on this RCN615T remote as a large disc with the OK button in the center are not available on the front panel The d...

Page 40: ...ion depending on which menu is active They can be used to select a highlighted menu item in any service menu Also when a specific alignment menu is entered they are used to increment or decrement the...

Page 41: ...s then finding the 8 screen sensors The figure below shows where those sensors are physically located and how they are numbered 1 2 3 4 5 6 7 8 The sensor calibration software projects a small block...

Page 42: ...ed or blue So if green does not pass the luma test it is probable there is too much ambient light Move the cabinet out of direct lighting and try the routine again However it is also possible geometry...

Page 43: ...27 or very close to it The above error code would indicate the middle upper red sensor was not located from the right That probably means the raster is shifted too far to the right for the DAC to brin...

Page 44: ...t operations The Default EEPROM holds the convergence alignment values used during any autoconvergence procedure The 2H and 2 14H Mode EEPROMs contain only the differences between the Default EEPROM v...

Page 45: ...k mark is visible autoconvergence will run successfully If it is not it means the most recent sensor calibration attempt was not successful Error codes will be logged in the Event screen indicating wh...

Page 46: ...isappear The sensor calibration routine should now be run to place the checkmark back into the box before exiting this menu DEFAULTS The Defaults menu is the backup plan for technicians that find them...

Page 47: ...faults is essentially the same procedure as the Store Defaults function in the Store routine except it is not required to do another Sensor Calibration It is not recommended this one be used Also note...

Page 48: ...ure the full height and width on each instrument assuring the centerline is as accurate as possible Appendix C Screen Dimensions Mylar Pattern Level 2 Alignment Point Locations on MylarTemplate LEVEL...

Page 49: ...0 6 1 5 0 8 0 6 1 3 1 5 3 0 2 3 1 1 5 8 0 2 3 7 2 0 4 0 8 3 0 9 0 8 7 5 4 0 6 1 7 5 9 0 6 1 5 1 0 5 0 2 1 The convergence pattern easily tolerates variations up to about 5 which equates to about 1 16...

Page 50: ...s required is when The SSB module is replaced and the original convergence file is not available The SSB module is replaced and the original file is available but the resulting convergence is not acce...

Page 51: ......

Page 52: ...T ITC222 Convergence First Edition 0516 First Printing Prepared by Thomson Inc for TTE Technology Inc PO Box 1976 Indianapolis IN 46206 U S A...

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