Adjustment Procedure; Colour Purity - Panasonic CT-F2936LC Service Manual

4 Adjustment Procedure

4.1. Adjustment Procedure
4.1.1. +B Voltage
Item / preparation
1. Operate the TV set.
2. Set control as follows :
Brightness ........... minimum
Contrast ............... minimum
Adjustment procedure
1. Confirm the DC voltage at the indicated test points, as
follows :
TPD 15 : 3.35 ± 0.2V
TPD 16 : 141 ± 2V
TPD 17 : 8.2 ± 0.5V
TPD 18 : 1.9 ± 0.2V
TPD 19 : 5.2 ± 0.2V
TPD 20 : 220 ± 15V
4.1.2. High Voltage
Item / preparation
1. Receive the crosshatch pattern.
2. Set to 0 Beam.
Screen VR .......... minimum
Contrast .............. minimum
Adjustment procedure
1. Connect a DC voltage meter to D866 and confirm the +B
voltage is 141.0 ± 2V.
2. Connect a high frequency voltmeter to heater and confirm
that voltage reads 6.30 ± 0.24 (VRMS).
3. Normalize the brightness and contrast.
4.2.

COLOUR PURITY

1. Set Bright and Contrast controls to their maximum
positions.
2. Operate the TV set over 60 minutes.
3. Full degauss the picture tube by using an external
degaussing coil. By rotating R-B static convergence
magnet.
4. Apply a crosshatch pattern signal and adjust roughly the
static convergence magnets.
5. Apply a green pattern signal.
6. Loosen a clamp screw for the Deflection Yoke and move
the Deflection Yoke as close to the purity magnet as
possible.
7. Adjust the purity magnet so that a vertical green field is
obtained at the center of the screen.
4.1.3. NTSC TINT COLOUR
Item / preparation
1. Connect oscilloscope probe to TPL1 (R OUT) with 10kΩ
series resistor.
2. Press Main Menu and set system to use AV-NTSC (3.58
MHz).
DYNAMIC ................... Normal
Channel CLR Set ..... STD
Adjustment procedure
1. Adjust Sub-Tint so that No. 2, 3 and 4 becomes level
waveform is similar to Fig. 3.
2. Confirm phase at Tint is changes more than ± 15 by Tint
control.
3. Confirm that colour level is maximum when colour DAC is
adjusted to maximum position.
Note: Use remote control only when adjusting user mode to
Sub-Tint.
8. Slowly press the Deflection Yoke and set it where a uniform
green field is obtained.
9. Adjust roughly the Low Light controls and make sure that a
uniform white field is obtained.
10. Tighten the clamp screw.
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CT-F2936LC