Panasonic CT32HX40B - 32" COLOR TV, Руководство по обслуживанию

Страница: 24 / 76

- 24 -
Service Adjustments (Electronic Controls)
Sub-Brightness
Serviceman DAC Adjustment (BRIGHT)
Adjustment of this control is important for setting proper
operation of customer brightness and picture controls.
Do not adjust the SCREEN VR after the
Sub-Brightness is set.
Preparation:
1.
Normalize picture settings.
2. Switch NATURAL COLOR to OFF.
3. Switch COLOR TEMPERATURE to NORMAL.
Procedure:
1.
Apply a black white cross pattern.
2. In the Serviceman Mode for making electronic
adjustments, select the DAC adjustment (BRIGHT)
and adjust data so that 7.5IRE part is the same
light output as the 3IRE part.
Sub-Contrast
Serviceman DAC Adjustment (BRIGHT, CONT)
This adjustment is factory set. Do not adjust unless
repairs are made to associated circuit, the CRT Board
or when the CRT is replaced.
Preparation:
1.
Apply a Black-White pattern.
2. Set the picture settings to normal.
3. Connect the oscilloscope to TP47G.
4. Connect a jumper from A15-PIN(6) to cold
ground ( ).
Procedure:
1.
In the Serviceman Mode, select DAC for Green
Cutoff Adjustment (CUT G) and set data to 2 80.
2. Set user color to minimum.
3. In Serviceman Mode, select DAC for Brightness
adjustment (BRIGHT), and adjust data to obtain
2.6v between 7.5IRE and GND level at TP47G.
(See waveform detail, Fig. 25)
4. In Serviceman Mode, select DAC for Contrast
adjustment (CONT), and adjust data to obtain
3.3
±
0.1V between 7.5IRE and 100IRE level at
TP47G. (See waveform detail, Fig. 25)
5. Set user color to normal.
6. Remove the jumper.
Color Output Adjustment
Serviceman DAC Adjustment (COLOR, TINT)
Make sure that Sub-Contrast adjustment was finished
prior to do this adjustment
Preparation:
1.
Normalize the picture settings.
2. Switch NATURAL COLOR to OFF.
3. Connect a jumper from A15 PIN(6) to cold
ground (
).
Procedure:
1.
Apply a rainbow color bar pattern.
2. In Serviceman Mode adjust “R DR” and “B DR”
data to “AF”.
3. Connect the oscilloscope to TP47B.
4. In Serviceman Mode adjust “TINT” data so that the
peak white is located at same level as peak “3”,
within 0
±
0.03V. (See waveform detail, Fig. 26),
5. Connect the oscilloscope to TP47R.
6. In Serviceman Mode adjust “COLOR” data so that
the amplitude “a” is 1.0
±
0.03V. (See Fig. 27)
3 IRE
7.5 IRE
Figure 24. Pattern
100IRE
7.5IRE
GND
Figure 25. TP47G waveform
3.3
±
0.1 v
2.6
v
WHITE
1
2
3
4
5
6 7
8
9
10
Figure 26. TP47B waveform
0
±
0.03V
2
1
3 4
5
6
7
8 9 10
WHITE
"a"
Figure 27. TP47R waveform
1.0
±
0.03V