Panasonic TX-29P250T Service Manual ▷ View online
5 ADJUSTMENT PROCEDURE
5.1. VOLTAGE CONFIRMATION
Item/Preparation
Adjustment Procedure
1.
Operate the TV set.
2.
Set controls :
Bright Minimum
Contrast Minimum
Volume Minimum
Bright Minimum
Contrast Minimum
Volume Minimum
1.
TPD15 : 144.8 ± 1V (D-Board)
2.
TPD13 : 14.6 ± 1V (D-Board)
3.
TPD 8 : 7.4 ± 0.5V (D-Board)
4.
TPD 9 - TPD 11 : 34.0 ± 1.5V (D-Board)
5.
TPD10 : 15.5 ± 1V (D-Board)
6.
C864 (-) : -15.7 ± 1V (D-Board)
7.
Pin 15 of connector D2 : 31 ± 2V (D-Board)
8.
TPD32 : 224 ± 10V (D-Board)
9.
Pin 2 of IC1252 : 2.5 ± 0.25V (A-Board)
10. Pin 3 of IC1252 : 3.3 ± 0.3V (A-Board)
11. Pin 3 of IC1252 : 12 ± 0.6V (A-Board)
12. Pin 2 of IC1252 : 9.0 ± 0.4V (A-Board)
13. Pin 3 of IC1252 : 8.0 ± 0.4V (A-Board)
14. Pin 2 of IC1252 : 5.0 ± 0.4V (A-Board)
15. Pin 2 of IC1252 : 3.5 ± 0.2V (A-Board)
16. Pin 2 of IC1252 : 3.5 ± 0.2V (A-Board)
5.2. E.H.T CHECK
Item/Preparation
Adjustment Procedure
1.
Receive an RF signal, window or crosshatch pattern.
2.
Set the Brightness and Contrast to minimum (0 Beam)
3.
Connect the High Voltage Voltmeter to the CRT ANODE CAP.
4.
The set should be switched to AV (no input) contrast and
brightness minimum.
brightness minimum.
1. Check the EHT voltage is (31.0±1.0) kV.
2.
Switch from AV mode to TV.
3.
With the Brightness and the contrast controls MAX, check that the
high voltage does not drop more than 3.0 kV from the above
measurement with R.F. signal.
high voltage does not drop more than 3.0 kV from the above
measurement with R.F. signal.
5.3. SUB CONTRAST
Item/Preparation
Adjustment Procedure
1.
Receive PAL colour bar pattern
2.
Connect oscilloscope to A21 pin 3.
3.
Set controls:
BRT.......... ......CENTER
COLOUR........CENTER
CONTRAST....MAX
AI.............. ......OFF
BRT.......... ......CENTER
COLOUR........CENTER
CONTRAST....MAX
AI.............. ......OFF
1. Adjust Sub Contrast (Service 1) :
A=3.5± 0.1V
Fig. 1
2.
Adjust Video gain 2 (Service 1) so that Sub picture level B
becomes as same as Main picture level A.
becomes as same as Main picture level A.
Fig. 2
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TX-29P250T
5.4. SUB TINT
Item/Preparation
Adjustment Procedure
1.
Receive a 3.58 MHz NTSC rainbow pattern
2.
Connect oscilloscope to A21 pin 6.
3.
Set controls:
BRT.......... ......CENTER
COLOUR........CENTER
CONTRAST....MAX
NTSC TINT.....CENTER
AI.............. ......OFF
BRT.......... ......CENTER
COLOUR........CENTER
CONTRAST....MAX
NTSC TINT.....CENTER
AI.............. ......OFF
1.
Adjust Sub NTSC Tint so that the peak of level of waveform is
similar to Fig. 3
similar to Fig. 3
Fig. 3
2.
Receive the Rainbow pattern (3.58 MHz NTSC) on both of Main
and Sub pictures.
and Sub pictures.
3.
Adjust Sub NTSC TInt 2 so that the peak of level of waveform is
similar to Fig. 4
similar to Fig. 4
Fig. 4
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TX-29P250T
5.5. SUB COLOUR
Item/Preparation
Adjustment Procedure
1.
Receive a 3.58 MHz NTSC rainbow pattern
2.
Connect oscilloscope to A21 pin 3.
3.
Set controls:
BRT.......... ......CENTER
COLOUR........CENTER
CONTRAST....MAX
AI.............. ......OFF
BRT.......... ......CENTER
COLOUR........CENTER
CONTRAST....MAX
AI.............. ......OFF
1.
Adjust Sub Colour:
A=3.1±0.5V
A=3.1±0.5V
Fig. 5
5.6. SECAM BLACK LEVEL
Item/Preparation
Adjustment Procedure
1.
Receive SECAM white pattern
2.
Connect oscilloscope to A44 pin 39.
3.
Set controls:
BRT.......... ......CENTER
COLOUR........CENTER
CONTRAST....MAX
AI.............. ......OFF
BRT.......... ......CENTER
COLOUR........CENTER
CONTRAST....MAX
AI.............. ......OFF
1.
Adjust SECAM B-Y so that H-blanking time and colour center are
equal level.
equal level.
Fig. 6
2.
Connect oscilloscope to A44 pin 41.
3.
Adjust SECAM R-Y OUT so that H-blanking time and colour cente
are equal level.
are equal level.
Fig. 7
4.
Connect oscilloscope to A44 pin 39.
5.
Receive SECAM white pattern on both Main and Sub picture.
6.
Adjust Sub SECAM B-Y so that H-blanking time and colour center
are equal level.
are equal level.
Fig. 8
7.
Connect oscilloscope to A44 pin 41.
8.
Adjust Sub SECAM R-Y so that H-blanking time and colour center
are equal level.
are equal level.
Fig. 9
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TX-29P250T
5.7. VRS ADJUSTMENT
1. PREPARATION
a. Set DY to CRT not to tilt up and down and left and right
deflection. (Fig. 1)
b. Set CY to CRT and set CY magnet primarily.
Pur Mg : Set Pur Mg that 2 magnets are vertical
position.
VRS Mg : Set VRS Mg that 2 magnets are side position.
position.
VRS Mg : Set VRS Mg that 2 magnets are side position.
c.
Set geomagnetic correction DAC [0].
2. ADJUSTMENT
a. Receive the white balance pattern.
b. Adjust V-CENTER.
c.
Set R,B CUT OFF to minimum (0), and set G CUT OFF
to center (511).
to center (511).
d. Receive the aging pattern.
e. Set 2 magnet of vertical position to up and down equally
so that center part of CRT. (Fig. 3)
Fig. 1
Fig. 2
Fig. 3
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TX-29P250T
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