770-790 series PTV incorporates a Digital Convergence Panel. This panel does not contain the familiar three rows of adjustment potentiometers as employed in the past PTV systems. Instead geometry and screen convergence settings are contained within EEPROM located on the Digital Convergence Panel. These settings may be easily modified through the following procedures.
- When aligning the digital convergence, the adjustments are very interactive in that a change in one quadrant will potentially effect other areas of the screen; thus, requiring several alignment passes through the convergence sequences.
- A convergence panel severely out of convergence will not necessarily have perfect icon shapes. It’s not uncommon to see bent or twisted icons.
- In some instances to initiate icon movement with one of the arrow functions on the remote transmitter, it may require the technician to hold the desired button for several moments to see movement. This is normal. If movement doesn't occur, continue alignment sequence in other areas of the screen (use icon positioning keys 2,4,6,8), then return to the problem area of the screen. The technician may need to save present settings then exit to the convergence menu, and then return to the problem area of the screen.
- Remember the adjustment points are highly interactive with each other. A change in one quadrant of the screen could affect other areas.
- When converging be sure you’re at eye level with the area of the screen you are adjusting.
- When converging a PTV, it is not required to follow the pre-defined sequence of adjustment points. When converging or adjusting the green geometry of a set that is severely out of convergence, begin at the outer regions (edges) of the set, working in a circular pattern towards the middle. Only move the icon a short distance towards the target point, then continue circling the outer perimeter moving each sector partially.
- The first procedure "Convergence Touch Up" allows for minor convergence adjustment of anycolor. With "Convergence Touch Up" it's assumed that one or two of the colors are geometrically correct and used as reference for the color/s requiring alignment. This alignment is required for minor convergence adjustments, single yoke or CRT replacements and any physical alteration of a single Lens/CRT Assembly.
- The second procedure "Mechanical Alignment" is required with Major Convergence and Geometry Alignments, Yoke replacement, Convergence Module Replacement and the replacement of a CRT or physical alteration of the Lens/CRT Assembly.
- The third procedure "Major Convergence/Geometry Alignment" is required when a Convergence Module or all three CRT's are replaced. This procedure is also required if the Green Geometry requires adjustment. Note: If the Screen Geometry of the Red or Blue gun is correct, use the "Convergence Touch Up" procedure to converge the green using the Red or Blue as a reference.
CONVERGENCE SERVICE MODE PROCEDURE
Note: This procedure is required for all of the following geometry and convergence adjustments.
Using the remote transmitter, enter the following seven-button sequence to activate the convergence mode. [06 -25 -97 -Menu (M)]
The "Opening Menu" will appear offering choices:
Channel 3
Use Channel ▲/▼ to Select a Channel with Video.
Remote control key functions:
▲, ▼, ◄, ►: Adjust Convergence
M: Advance "cross" location ▲, ▼, ◄, ►
To Exit Convergence
Status: Abort/Cancel Changes
M: Begin Convergence.
[Video information must be present to correctly adjust the convergence. A signal source is required to lock the vertical and horizontal sync. After entering the "convergence service mode," verify the presence of a video source by confirming the presence of active audio (use the volume up function on the remote).
Use the channel up and down function on the remote to select the desired tuning source.]
Select item "M" from the first menu, the "Convergence Menu" will appear featuring 5 possible selections.
Channel 3. Convergence:
green geometry
- Red To green Convergence
- Blue To green Convergence
- Green To red Convergence
- Green To blue Convergence
- Status: Abort/Cancel Changes
CONVERGENCE TOUCH-UP PROCEDURE
- Enter the "convergence service mode" as described above in the "convergence service mode procedure".
- Select the desired color requiring adjustment. Note: Do not select Green Geometry (1). This procedure is described under "Major Convergence/Geometry Alignment. If Green Geometry is altered during this procedure a "Major Convergence/Geometry Alignment" maybe required.
- Cover the Output Lens of the single color presently NOT being adjusted. Example: If you select Green to Red Convergence (4) cover the Blue Output Lens.
- The highlighted adjustment Icon (Cross) should be illuminated on the middle left side of the screen. Make the necessary Convergence Adjustments using the following Remote Keys:
Use the Arrow Down Key (▼ ) to adjust the selected color down.
Use the Arrow Right Key (-) to adjust the selected color to the right.
Use the Arrow Left Key (+) to adjust the selected color to the left.
Move to the next location to be converged. It is not required that the full Convergence Sequence be followed while performing the "Convergence Touch Up Alignment Procedure".
The following alternate Remote Keys allow for positioning of the Icon to the desired adjustment location:
- Key 2 on the Remote Transmitter will position the Adjustment Icon upward on the screen.
- Key 8 on the Remote Transmitter will position the Adjustment Icon downward on the screen.
- Key 4 on the Remote Transmitter will move the Adjustment Icon to the Left.
- Key 6 on the Remote Transmitter will move the Adjustment Icon to the Right.
- Return to the "Convergence Service Menu" by selecting Key number 3 on the remote transmitter or by sequencing the Icon to the last adjustment point at the lower right corner of the screen and pushing the Menu (M) Key on the Remote Transmitter.
- Repeat steps 1 through 6 for other required Convergence Alignments.
- To Save the Adjustment completed in the last procedure, Exit/Save the Convergence Service Mode by selecting Key 1 on the Remote Transmitter. This forces the corrections to be written to the EEPROM on the Convergence Module.
CONVERGENCE CENTER FREQUENCY ADNUSTMENT
[This adjustment should not be done unless a component on the PLL circuit has been replaced]
- Connect a voltmeter from TP3 on the convergence board to cold ground (use top shield).
- Adjust L3 to obtain 1.5Vdc.
MAJOR CONVERGENCE/GEOMETRY ADJUST
Major Convergence/Geometry alignment procedures are required when replacing the Digital Convergence Module or all three CRT's require replacement.The following procedure must be followed in the order listed to insure satisfactory results.
Use the following order to converge a set requiring "Major Convergence/Geometry Alignment":
- CRT Centering using the Centering Tabs around the Yoke.
- Align the Convergence by first setting the Green Geometry using the "Convergence Template" and following up with the Red and Blue Convergence Alignment.
CRT SCREEN CENTERING [MECHANICAL]
- Locate the Screen Center by placing strings diagonally across the viewing area of the screen from corner to corner. The Screen Template, if centered correctly on the screen, can also provide the center point location.
- Enter the "Service Setup Mode" (06-25-96-Menu-Menu) and confirm approximate register values of the following registers: Note: Confirming the following register values is not required if the Small Signal or Large Signal Boards have not been replaced or altered.
- Connect a Signal Source (pattern generator) to the antenna terminal of the set. A signal source must be present while following these procedures.
- Enter the Convergence Service Mode as described above in the Convergence Service Mode Procedure.
- Place a jumper wire from pins 1 to 2 of test point 4 (tp4) on the convergence panel.
- Select "1" Green Geometry from the Convergence Service Mode Menu. Cover the Red and Blue output lens using a 7" X 7" piece of cardboard.
- The highlighted icon (cross) maybe visible on the left side of the screen about half way up. Position the icon at the screens approximate center by pressing the M on the remote transmitter 3 times.
- Using the Centering tabs of the yoke, position the highlighted Green icon to the screen center as defined by the diagonal strings positioned across the viewing area of the screen or using the center point on the screen template.
- Confirm the centering by viewing the screen from the front of the unit.
- Return to the Convergence ServiceMode Menu by selecting number 3 on the remote transmitter. Select number "2" on the remote to activate the "Red to Green" Convergence. Cover the Green and Blue output lenses with a 7" X 7" piece of cardboard. Repeat step 7 through 9 using the Red yoke Centering Tabs.
- Return to the Convergence Service Mode Menu by selecting "3" on the remote transmitter. Select "2" to repeat convergence. Select "3" on the remote to activate the "Blue to Green Convergence". Cover the Red and Green output lenses with a 7" X 7" piece of cardboard. Repeat step 7 through 9 using the Blue yoke Centering Tabs.
- Exit the convergence mode by selecting the Status Exit function on the remote transmitter. Remove the 7" X 7" pieces of cardboard from the output Lenses. CRT centering is complete.
- Remove the jumper from TP4 on the Digital Convergence Module.
GREEN GEOMETRY
{The Green Geometry must be accurately adjusted to achieve proper convergence and screen geometry. The Red and Blue displays will individually be made to conform to the Green.}
- Confirm the CRT Centering as described in the previous procedure.
- Remove the protective screen enhancement filter (if present) to make the following adjustments.
- Attach the "Screen Template" to the screen using a low tac tape.
- Enter the Convergence Service Mode by selecting 06-25-97-Menu with the Remote Transmitter. Note: Video information must be present to correctly adjust the convergence. This can be checked by the presence of audio on the channel selected. Select Mto begin the convergence adjustments.
- Select "1" Green Geometry. The Green icon should be positioned near the left edge of the screen and on the middle row of the template If not visible hold the right arrow key of the Remote Transmitter until the icon is visible on the screen. Use the M key to position the icon on the next horizontal point in the convergence sequence. Move the Green icon using the Remote Transmitter arrow buttons Only Half Way towards the next template point. Continue through the whole Green Geometry Sequence moving the Green icons Only Half Way towards the target point on the template. Upon reaching the End Here point on the template press the M to recalculate.
- Select Repeat Convergence by selecting the number "2" on the Remote Transmitter. Select Green Geometry number 1 on the Remote Transmitter. Follow the Green Geometry Sequence through a second pass, this time accurately aligning the Green icon to the alignment points on the template. Repeat the Green Geometry Sequence as required. When completed Exit/Save the changes by entering the converging page and selecting 1.
- Confirm the accuracy of the Green Geometry.
RED & BLUE CONVERGENCE
- Remove the Screen Template.
- Enter the Convergence Service Mode by selecting 06-25-97-Menu with the Remote Transmitter. {Note: Video information must be present to correctly adjust the convergence. This can be checked by the presence of audio on the channel selected. Select M to begin the convergence adjustments.}
- Enter the "Red to Green Convergence" by selecting the number "2" on the Selection page with the Remote Transmitter.
- Cover the Blue Output Lens with a 7" X 7" piece of cardboard.
- The Red icon should be positioned near the left side of the screen and on the middle row of convergence points. If the Red icon is not visible hold the right arrow key of the Remote Transmitter until the icon is visible on the screen.
- Use the M key to position the icon on the screen at the next point in the convergence sequence. Use the arrow keys to position the Red icon approximately Half Way Towards The Green Icon. Continue through the whole Red to Green convergence sequence by moving the Red icons Only Half Way towards the green icons. Upon reaching the last position at the lower right of the screen, select M to recalculate.
- Select Repeat Convergence by selecting the number "2" on the Remote Transmitter. Select "Red to Green Convergence number 2 on the remote transmitter. Follow the Red to Green Convergence Sequence through a second pass, this time accurately aligning the Red Icon to the Green. Repeat Red to Green Convergence Sequence as required to accurately align the Red to Green Convergence. When completed Exit/Save the changes by selecting 1 from the Convergence Menu.
- Enter the Convergence Service Mode by selecting 06-25-97-Menuwith the Remote Transmitter. Note: Video information must be present to correctly adjust the convergence. This can be checked by the presence of audio on the channel selected.
- Select M to begin the convergence adjustments.
- Enter the "Blue to Green Convergence" by selecting the number "3" on the Selection page with the Remote Transmitter.
- Remove the 7" X 7" piece of cardboard from the Blue Output Lens and cover the Red Lens.
- Repeat the procedure insteps 5 and 6 by adjusting the Blue icons to the Green.
- When convergence alignment is complete, save the data by selecting "1" from the convergence service menu.
- Remove the 7" X 7" piece of cardboard from the Blue Output Lens. Refine the complete performance of the Convergence as described in the "Convergence Procedure".
HORIZONTAL PHASE ADJUST
- Enter the Service Setup Mode (06-25-96-Menu).
- Select register number 02 (Brightness) and note the present hex value. Increase the value to 7C.
- Select Register number 42 (Horizontal Width) and note the present hex value. Reduce the Horizontal Width by approximately 1 1/2 to 2 inches.
- Tune the set to an active off air or cable channel. [Note: It is recommended that a signal source other than a generator be used to do this alignment. Use an RF signal source such as a broadcast channel.]
- Select register 48 (Horizontal Phase).
- Using a 7" X 7" piece of cardboard cover the Red and Blue CRT Output Lenses.
- Adjust the Horizontal Phase to center the picture information onto the reduced raster. This centering can easily be accomplished by observing the left and right edge of the reduced raster.
- Select register 42 and set the value as previously noted in step 3 of this procedure.
- Select register number 02 (Brightness) and set the hex value as previously noted in step 2 of this procedure.
- Remove the 7" X 7" pieces of cardboard.
- Typical default value is 11.
Universal remote control Set-up Codes
With GE remote: 0062 0204 0184 0208 0205 0206 0207 0004 0189 0183 0199 0200 0288 0456 0003 0008 0068 0075 0086 0087 0141 0062 0204 0207 0183 0226 0288 {716, 734, 796, 814 734, 743, 744, 745, 755, 814, 823, 824, 825]
With RCA RCR 311W: 1004, 1014, 1046, 1051, 1060, 1061, 1062, 1066,1067, 1072, 1073, 1074, 1075, 1076, 1077, 1078, 1082, 1083, 1112, 1136, 1161, 1164, 1166, 1176, 1002, 1009, 1014, 1036, 1051, 1056, 1060, 1061, 1066, 1067,1072, 1073, 1074, 1077, 1078, 1082, 1086, 1136, 1152, 1156, 1166, 1174, 1175, 1180, 1181
With RCA RCR 312W: 11454, 11866, 11755, 10054, 10051, 10030, 10096, 10802, 11198, 11254, 11963, 11990, 11454, 10054, 10690, 11744, 11867
With other universal remote Controls: 1049 1132 1049 1132 1232 1057 1374 1365 1366 14151144 1206 1364 1317 1287 1194 1289 1142 1008 1383 1061 1051 1278 1262 1130 1233 1172 1053 1380 1046 1027 1053 1054 1350 1160 1155 1298 1025 1231 1238 1481