DOWNLOAD Panasonic TX-21PS70TQ Service Manual ↓ Size: 7.35 MB | Pages: 76 in PDF or view online for FREE

system to use AV-NTSC 
(3.58 MHz).
DYNAMIC ................. 
Normal
ChannelCLR Set ..... STD

2. Confirm phase at Tint is changes more than ± 30 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.

Fig. 3

 

 

 

1.  Receive the PAL B/G studio colour bar pattern and adjust local frequency at the best tuned 

position.

2.  Pic Menu: Dynamic Normal, Confirm Contrast - 63, Sub Contrast - 21.

3.  Channel colour set --------- STD

4.  “CHK2” and press digit key “5” (AKB OFF) also confirm OSD become blue colour.

5.  Connect TPA 10 to TPA 20.

6.  Set (A) to 2.3 ± 0.2V by BRT (CHK2) at measurement point TPL 2 Fig. 4.

 

 

1.  Connect oscilloscope probe to TPL 2 (G OUT) with 10k

Ω

 series resistor and adjust Contrast so 

that (B) as in Fig. 4 is 2.4 ± 0.1V.

2.  Adjust “Sub Colour” so that waveform as in Fig. 4 (1) 2.5 ± 0.1V.

3.  Connect oscilloscope probe to TPL 1 (R OUT) with 10k

Ω

 series resistor and confirm waveform 

as in Fig. 5 is (2) 2.7 ± 0.4V.

4.  Take out jumper TPA 10 and TPA 20.

5.  Press digit key “5” (AKB ON) and confirm the OSD become white colour.

Before Colour Purity, Convergence and White Balance adjustment are attempted, 

V. Height, H. Centre and Focus adjustments must be completed.

Colour Purity

 

1.  Set the Brightness and Contrast controls to their maximum positions.

2.  Operate the TV set for 60 minutes.

3.  Fully degausse the picture tube by using an external degaussing coil.

4.  Apply a crosshatch pattern signal and adjust the static convergence magnets to the approximately 

correct position.

5.  Receive a black and white signal.

6.  Set the control as follows:

Red................minimum
Green.............minimum
Blue...............minimum
Press the Shipping button on the remote control twice to select CRT Adjustment Mode to select 
low light.

7.  Loosen the clamp screw for the Deflection Yoke A in Fig. 10 and move the Deflection Yoke as 

close to the purity magnet as possible.

8.  Adjust the purity magnetic rings so that a vertical green field is obtained at the centre of the 

screen.

Fig. 6

 

9.  Slowly push the Deflection Yoke and set it where a uniform green field is obtained.

Fig. 21

 

10.  Re-adjust the Low Light controls to their correct settings and make sure that a uniform white field 

is obtained.

11.  Tighten the clamp screw A in Fig. 10.

Convergence