AlignmentsL01.1E AB8.EN 57
8. Alignments
Index of this chapter:- BRIGHTNESS to minimum (OSD just visible in a dark
1. General Alignment Conditionsroom).
2. Hardware Alignments5. Return to the SAM via the MENU key.
3. Software Alignments and Settings6. Connect the RF output of a pattern generator to the
antenna input. Test pattern is a 'black' picture (blank
Note: The Service Default Mode (SDM) and Service Alignment screen on CRT without any OSD info).
Mode (SAM) are described in chapter 5. Menu navigation is 7. Set the channel of the oscilloscope to 50 V/div and the time
done with the 'CURSOR UP, DOWN, LEFT or RIGHT' keys of base to 0.2 ms (external triggering on the vertical pulse).
the remote control transmitter.8. Ground the scope at the CRT panel and connect a 10:1
probe to one of the cathodes of the picture tube socket (see
diagram B).
8.1General Alignment Conditions
9. Measure the cut off pulse during first full line after the frame
blanking (see Fig. 8-2). You will see two pulses, one being
Perform all electrical adjustments under the following the cut off pulse and the other being the white drive pulse.
conditions:Choose the one with the lowest value, this is the cut off
Mains voltage and frequency: according to country?s pulse.
standard.10. Select the cathode with the highest VDC value for the
Connect the set to the Mains via an isolation transformer.alignment. Adjust the Vcutoff of this gun with the SCREEN
Allow the set to warm up for approximately 20 minutes.potentiometer (see Fig. 8-1) on the LOT to the correct
Measure the voltages and waveforms in relation to chassis value (see table below).
ground (with the exception of the voltages on the primary 11. Restore BRIGHTNESS and CONTRAST to normal (= 31).
side of the power supply). Never use the cooling fins/plates
as ground.
Test probe: Ri > 10 M&; Ci < 2.5 pF.
Use an isolated trimmer/screwdriver to perform the
alignments.max.
VCUTOFF [VDC]
8.2Hardware Alignments0V Ref.
CL 06532130_014.eps
131000
Figure 8-2
02310231
CUT-OFF VOLTAGE
Screen sizeCut-off [V]
13V, 14 , 14RF, 15RF, 17 , 19V, 20140 ? 4
C
21 (L01S)150 ? 4
021221 (L01L), 20RF, 21RF, 24WS,125 ? 4
25BLD, 25HF, 28 BLD, 28WS
026825V, 25BLS, 25RF, 27V, 28BLS, 29 ,145 ? 10
29RF, 32V, 33 , 32WS, 35V
CL 16532008_056.pdf
220801
ComPair 5520
0267D
Figure 8-3
8.2.2 Focusing
76021. Tune the set to a circle or crosshatch test pattern (use an 0240
1004
external video pattern generator).
A
1002963196412. Choose picture mode NATURAL (or MOVIES) with the
SDM
?SMART PICTURE? button on the remote control
transmitter.
3. Adjust the FOCUS potentiometer (see Fig. 8-1) until the 5445
vertical lines at 2/3 from east and west, at the height of the
Bcentreline, are of minimum width without visible haze.
1000 (TUNER)LOT
Focus
Screen
VG2
8.3Software Alignments and Settings
Enter the Service Alignment Mode (see chapter 5). The SAM
16532008_038.eps
160501menu will now appear on the screen.
Select one of the following alignments:
Figure 8-1 1. Options
2. Tuner
8.2.1 Vg2 Adjustment3. White Tone
4. Geometry
5. Audio
1. Activate the SAM.
2. Go to the WHITE TONE sub menu.
3. Set the values of NORMAL RED, GREEN and BLUE to 40.
4. Go, via the MENU key, to the normal user menu and set
- CONTRAST to zero. |
ACEC
PHILIPS
