Philips PTV800, Service Manual

Page: 87 / 567

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.
1. Confirm the CRT Centering as described in the previous procedure.
2. Remove the protective screen enhancement filter (if present) to make the following
adjustments.
3. Attach the "Screen Template" to the screen using a low tac tape.
4. 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.
5. 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.
6. 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.
7. Confirm the accuracy of the Green Geometry.
RED AND BLUE CONVERGENCE
1. Remove the Screen Template.
2. 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.
3. Enter the "Red to Green Convergence" by selecting the number "2" on the Selection page
with the Remote Transmitter.
4. Cover the Blue Output Lens with a 7" X 7" piece of cardboard.
5. 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.
6. 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.
7. 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.
8. Enter the "Blue to Green Convergence" by selecting the number "3" on the Selection page
with the Remote Transmitter.