Alignments - Philips L01.1U Service Manual

www.freeservicemanuals.info

8. Alignments

Index of this chapter:
1. General Alignment Conditions
2. Hardware Alignments
3. Software Alignments and Settings
Note: The Service Default Alignment Mode (SDAM) is
described in the "Service Modes, Error Codes and Fault
Finding" section. SDAM menu navigation is performed by using
the MENU UP, MENU DOWN, MENU LEFT, and MENU
RIGHT keys of the remote control transmitter.
8.1 General Alignment Conditions
Perform all electrical adjustments under the following
conditions:
• AC voltage and frequency: 110 V (± 10 %), 60 Hz (± 5 %).
• Connect the television set to the AC power via an isolation
transformer.
• Allow the television set to warm up for approximately 20
minutes.
• Measure the voltages and waveforms in relation to chassis
ground (with the exception of the voltages on the primary
side of the power supply). Never use heatsinks as ground.
• Test probe: Ri > 10 MOhm; Ci < 2.5 pF.
• Use an isolated trimmer/screwdriver to perform the
alignments.
8.2 Hardware Alignments
ComPair
D
1004
Figure 8-1 Family board (top view)
8.2.1 Vg2 Adjustment
1. To enter SDAM, press the following key sequence on the
remote control transmitter: 0 6 2 5 9 6 directly followed by
the MENU button (do not allow the display to time out
between entries while keying the sequence).
2. Use the MENU UP/DOWN keys to highlight the WHITE
TONE sub menu.
7602
2403
A
Published in Heiloo Holland
Alignments
0231
C
0212
5445
B
LOT
Focus
Screen
VG2
16532016_008.eps
120401
L01.1U AC
3. Press the MENU LEFT or MENU RIGHT key to enter the
WHITE TONE sub menu.
4. In the WHITE TONE sub menu, press the MENU UP/
DOWN keys to select NORMAL RED, NORMAL GREEN,
or NORMAL BLUE.
5. Use the MENU LEFT/RIGHT keys to set the values of
NORMAL RED, NORMAL GREEN and NORMAL BLUE to
'40'.
6. Press the MENU button twice to enter the normal user
menu.
7. In the normal user menu, use the MENU UP/DOWN keys
to highlight the PICTURE sub menu (if necessary).
8. Press the MENU LEFT/RIGHT keys to enter the PICTURE
sub menu.
9. Use the MENU UP/DOWN keys to select PICTURE. Be
sure to record the current value of PICTURE.
10. Use the MENU LEFT/RIGHT keys to set the value of
PICTURE to '0'.
11. Use the MENU UP/DOWN keys to select BRIGHTNESS.
Be sure to record the current value of BRIGHTNESS.
12. Use the MENU LEFT/RIGHT keys to set the value of
BRIGHTNESS to minimum (OSD just visible in a dark
room).
13. Press the MENU button twice to return to the top level
SDAM menu.
14. Press the STATUS/EXIT button to hide the SDAM
onscreen display.
15. Connect the RF output of a video pattern generator to the
antenna input.
16. Input a 'black picture' test pattern to the television set.
17. Set the oscilloscope to 50 V/div and the time base to 0.2
milliseconds (external triggering on the vertical pulse).
18. Ground the scope at the CRT panel and connect a 10:1
probe to one of the cathodes of the picture tube socket (see
schematic diagram B).
19. Measure the' cut off pulse' during the first full line after the
frame blanking (see Fig. 8-2). You will see two pulses, one
being the 'cut off pulse' and the other being the 'white drive
pulse'. Choose the one with the lowest value; this is the 'cut
off pulse'.
20. Select the cathode with the highest VDC value for the
alignment. Adjust the Vcutoff of this gun with the SCREEN
potentiometer (see Fig. 8-1) on the LOT to the correct
value (see table 8-1).
21. Press the STATUS/EXIT button to display the SDAM
onscreen display.
22. Press the MENU button to enter the normal user menu.
23. In the normal user menu, use the MENU UP/DOWN keys
to highlight the PICTURE sub menu (if necessary).
24. Press the MENU LEFT/RIGHT keys to enter the PICTURE
sub menu.
25. Use the MENU UP/DOWN keys to select PICTURE.
26. Use the MENU LEFT/RIGHT keys to reset the value of
PICTURE to the original value.
27. Use the MENU UP/DOWN keys to select BRIGHTNESS.
28. Use the MENU LEFT/RIGHT keys to reset the value of
BRIGHTNESS to the original value.
29. Press the MENU button twice to return to the top level
SDAM menu.
30. Use the POWER button on the remote control transmitter
or the POWER button on the television set to turn off the
television set. This will save the changes made in SDAM.
22/11/2016
8. EN 87