Philips 51PP9200D/37 Service Manual page 137

8.5 Convergence and Geometry Adjustments
8.5.1 Introduction
If the Medium Signal Board (MSB) has been replaced, the
following adjustments will be required in the order as shown:
1. Geometry.
2. Convergence.
3. Grey Scale (White Tone).
If the Large Signal Board (LSB) has been changed the
following adjustments are required:
1. Geometry.
2. Convergence.
If one or more CRTs have been replaced:
1. Geometry.
2. Convergence.
3. Grey Scale (White Tone).
If the SSB (Small Signal Board) has been changed:
1. Convergence.
Enter the Service Alignment Mode (SAM) by pressing the
following key sequence on the remote control transmitter:
0-6-2-5-9-6-[INFO]. Do not allow the display to time out while
entering the key sequence.
Cursor down to the GDE SAM level for the Geometry settings.
Cursor further down to the DCSM level for the Convergence
settings. Cursor up to the Alignments level for the Whitepoint
settings.
Note: Read the complete following text before starting the
alignments.
8.5.2 Screen Centring
If one or more CRTs are replaced, it will be necessary to
perform Screen Centring.
1. Place the Convergence Template on the TV screen or
place a string from corner to corner to determine the screen
centre.
2. Apply a centre cross pattern to the TV.
3. Enter the GDE SAM mode, described in the Geometry
section and disable Convergence.
4. Cover the Red and Blue CRTs.
5. Using the Centring rings on the Green CRT, centre the
cross onto the centre of the template.
6. Uncover the Red CRT and centre the Red onto the Green
cross.
7. Follow the same procedure with the Blue CRT.
Note: Only perform the Screen Centring for the first mode to be
adjusted. Do not repeat the adjustment for the other modes.
8.5.3 Geometry Alignment
The Geometry alignment data is stored in the NVM, located in
the ACS module (Automatic Convergence System, a part of the
MSB) . Whenever the ACS module or the Large Signal Board
(LSB) have been changed, a Geometry alignment will be
necessary. The Geometry Alignment is performed in the GDE
SAM alignment mode. Make sure the set is in the mode in
which you wish to align before entering the SAM mode. Use the
AV button on the Remote to select the input with a signal,
applied after entering the SAM mode.
Apply a crosshatch pattern to the set. Cursor Down to CONV
PROC in the menu and press the Right Cursor button to select.
Now disable the Convergence processor. Select GEOMETRY
in the menu and enter the following default values for the mode
being adjusted.
Alignments EBJ1.0U
Table 8-6 Geometry Default Values
Wide blank
Horizontal Shift
Horizontal Para
E-W Width
E-W Para
E-W Trap
Horizontal Bow
Vertical Slope
Vertical Ampl
S Correction
Vertical Shift
Fast Blank
After entering the default values, the E-W WIDTH, VERTICAL
SLOPE, and VERTICAL AMP should be the only settings
requiring further adjustment.
Note: Perform (and store) Convergence alignment after any
changes to the Geometry.
8.5.4 Convergence Mode
There are two new screen sizes for the NAFTA region
incorporating a Digital Convergence system using 208
adjustment points. The Convergence Processor is located on
the ACS module. The Convergence drive circuits are located
on the SSP (Small Signal Board). Data for the Convergence
and Geometry settings are stored in the EEPROM located on
the ACS module.
If the CRTs, the Large Signal Board (LSP), or the Small Signal
Board (SSB) are changed, a complete Geometry and
Convergence alignment will be necessary.
If the MSB with the ACS module, the Small Signal Board (SSB),
or CRTs are changed, a complete Convergence alignment will
be necessary.
To obtain the correct Geometry during Convergence, a
template must be used. There are nine Geometry and
Convergence settings, stored in the EEPROM on the ACS
Module.
• 51 inch 16x9 aspect ratio - Use Template, ask your NSO.
• 60 inch 16x9 aspect ratio - Use Template, ask your NSO.
8.5.5 Convergence Alignment
Enter the Service Alignment Mode (SAM) by pressing the
following key sequence on the remote control transmitter:
0-6-2-5-9-6-[i+]. Do not allow the display to time out while
entering the key sequence.
Make sure that a signal is applied to the set for the mode being
adjusted.
Make sure that the set is in the mode you wish to adjust before
entering the Convergence Alignment mode.
8. EN 137
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