Philips PR1906C121, Technical Service Data

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Convergence and Purity Adjustments
Notes:
1. The following adjustments were performed with a Sencore VG91 Universal Video Generator.
2. Set the VG91 Generator as follows: STD TV Ch. 3, RF-IF Range set to HI, RF-IF Level set to NORMAL
(1), Video Pattern = Raster, R-G-B raster controls OFF, Mode Switch set to L+R, Audio Frequency set
to 300Hz, and 0 Pilot (max. CCW).
3. Connect the RF output of the generator to the Television Antenna Input, and adjust the VG91 level to
remove any snow from the raster.
Pre-Convergence Procedure
Note: The degaussing procedure should be performed prior to this adjustment.
1. Place the multi-pole Purity and Convergence Assembly with the 2-Y pole purity rings directly in the
gap between the G2 and G3 (focus) grids as
shown in Figure 7.
2. Enter the Service Default Alignment Mode (SDAM) in either of the following two ways:
a. Press the following key sequence on the remote control transmitter while the set is in Standby
mode: 0-6-2-5-9-6-Status (Do not let the sequence time-out between entries)
b. Short service pin 0239 (on the CBA) to ground and switch power-on.
3. Apply a center cross or crosshatch pattern to the antenna/cable input terminal.
4. From the SDAM menu, use the Menu Up/Down buttons to highlight CO (Color Cut-off).
5. Use the Menu Right button to enter the CO sub menu.
6. Using the Menu Up/Down buttons select G (green).
7. Using the Menu Left button set green to minimum.
8. Loosen the yoke clamp screw, pull the yoke back, and remove the three yoke wedges.
9. Slide the yoke all the way forward so that it rests against the bell of the CRT.
10. Tighten the yoke clamp screw so that the yoke does not drop away from the bell of the CRT.
11. Slowly spread, and if necessary, rotate the 2-Y pole purity rings so that the red and blue lines are at
least parallel and preferably coincide at the 6:00 and 12:00 positions
(refer to Figure 8).
12. Proceed to the Color Purity Adjustment.
Figure 7 - Convergence and Purity Assembly