Philips L01.1L AC, Service Manual

Alignments

EN 65

L01.1L AC

8.

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) was 
described in chapter 5. Menu navigation is done with the 
'CURSOR UP, DOWN, LEFT or 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 set to the AC power via an isolation 
transformer.

•

Allow the 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 the cooling fins / 
plates as ground.

•

Test probe: Ri > 10 M

Ω

; Ci < 2.5 pF.

•

Use  an  isolated trimmer / screwdriver to perform the 
alignments.

8.2

Hardware Alignments

Figure 8-1 Family Board (top view)

8.2.1

Vg2 Adjustment

1.

Activate the SDAM.

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.

–

BRIGHTNESS to minimum (OSD just visible in a dark 
room).

5.

Return to the SDAM via the MENU key.

6.

Connect the RF output of a pattern generator to the 
antenna input. Test pattern is a 'black' picture (blank 
screen on CRT without any OSD info).

7.

Set the channel of the oscilloscope to 50 V/div and the time 
base to 0.2 ms (external triggering on the vertical pulse).

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).

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 
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. 

10. 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 below).

11. Restore BRIGHTNESS and CONTRAST to normal (= 31).

Figure 8-2 Vcutoff

Table 8-1 Vg2 cut-off point (large screen)

8.2.2

Focusing

1.

Tune the set to a circle or crosshatch test pattern (use an 
external video pattern generator).

2.

Choose picture mode NATURAL (or MOVIES) with the 
‘SMART PICTURE’ button on the remote control 
transmitter.

3.

Adjust the FOCUS potentiometer (see Fig. 8-1) until the 
vertical lines at 2/3 from east and west, at the height of the 
centerline, are of minimum width without visible haze.

8.3

Software Alignments and Settings

Enter the Service Default Alignment Mode  (see chapter 5). 
The SDAM menu will now appear on the screen.
Select one of the following alignments:
1.

OPTIONS

2.

TUNER

3.

WHITE TONE

4.

GEOMETRY

5.

AUDIO

0231

0212

C

16532016_008.eps

120401

A

D

B

5445

LOT

Focus

Screen

VG2

5520

2403

0267

7602

ComPair  

1004

1002

1000 (TUNER)

9631

9641

SDM

0231

Screen Size

Cut-off
Voltage

25 / 28Tesla EU, 25 / 28BLD Ph 

+140V +/- 4V

21RFMEC/ 21RF SMGK25V /  27V / 32V / 35V 
/ 29SF / 25RF BLS EU25"HF LA

+145V +/- 4V

25"/ 21RF/ 25RF/ 29RF/ 29RF LG.PH29RF 
AP, CH29SF / 34'' SF AP,CH

+155V +/- 4V

21RF Ph / 21RF Ph RCF 25BLS / 28BLS / 
24RF BLS Ph29RF EU / 29RF BLS / 29RF 
SMGK29SF / 34RF 28WSRF / 32WSRF / 
24WS / 28WS / 32WS

+160V +/- 4V

0V Ref.

CL 06532130_014.eps

131000

V

CUTOFF

 [V

DC

]

max.