Philips Colour Television Specifications download pdf (Page 36)

Electrical Alignments

GB 88 EM3E8.

8.3 Software Alignments

8.3.1 Introduction

With the software alignments, it is possible to align the

Geometry, White Tone and Tuner IF settings.

Put the set in the SAM (see chapter 5.2.2). The SAM menu

will now appear on the screen. Select, via 'Alignments', one

of the following submenus:

Figure 8-3

• General: Select this sub-menu to perform general

software alignments.

• Normal Geometry: Select this sub-menu to perform

standard geometry alignments.

• Super Wide Geometry: Select this sub-menu to perform

geometry alignments for the 'Panorama' position in 16:9

sets (only valid for wide screen sets). Alignments can be

performed; however, it is better to set values as

mentioned below.

• Options: Select this sub-menu to set the initialisation

codes of the set via text menu’s.

• Option Numbers: Select this sub-menu to set all options

at once (expressed in two long numbers). The original

factory settings are printed on a sticker that is placed on

the CRT (inside the set).

• Store: Select this sub-menu to store the performed

alignments.

The alignments are explained below in the sequence of the

sub-menu.

Note:

• Once all alignments/settings have been completed the

item 'Store’ must be selected to record all the values in

the permanent memory of the set.

• If the Option codes have been changed and stored, the

set has to be switched 'OFF' and 'ON' using the mains

switch to activate the new settings (when switching via

Standby, the option code settings are NOT read by the

microprocessor).

• If an empty EAROM (permanent memory) is detected, all

settings are set to pre-programmed default values.

• A built-in test pattern can be called up in various sub-

menus. The test pattern generator can be switched on

using the item 'Test pattern on/off'. The test pattern only

appears AFTER the specific alignment has been

selected. The test patterns are generated by the

Teletext-IC (OTC).

8.3.2 'General' alignments

Drive

Method 1 (with colour analyser):

1. Select ‘Test pattern’ and turn it ‘On’. You will get a white

block in middle of the image now.

2. Select 'Cathode' and adjust the set to the correct light

output. This setting depends on the picture tube size and

brand. See table ‘Cathode parameter’ for the colour

analyser readings.

3. Select ‘Tint’ and set it to one of the three colour

temperatures (‘Cool’, ‘Normal’ or ‘Warm’)

4. Set the white levels according to the values in the table

‘White levels’.

Figure 8-4

Figure 8-5

Method 2 (without colour analyser):

1. Without having a colour-analyser one can set some

parameters. This is the next best solution. The setting-

parameters are average values coming from production

(statistics).

2. Select 'Cathode' and enter the value '15' (for all picture

tubes).

3. Select ‘Tint’ and set it to one of the three colour

temperatures (‘Cool’, ‘Normal’ or ‘Warm’).

4. Set the ‘Red’, ‘Green’ and ‘Blue’ parameters according to

the values in table ‘Tint settings’.

5. ‘RedBLoffset’: herewith the Black Level can be aligned

very precise. Default value is 7.

6. ‘Green BL offset’: herewith the Black Level can be

aligned very precise. Default value is 6.

Figure 8-6

Luminance delays

With this alignment you place the luminance information

exactly on the chrominance information (brightness is

pushed onto the colour). Use a colour bar/grey scale pattern

as test signal.

• Lum. Delay Pal: Apply a PAL colour bar/grey scale

pattern as a test signal. Adjust this parameter until the

transients of the colour part and black and white part of

the test pattern are at the same position.

• Lum. Delay Secam: Apply a SECAM colour bar/grey

scale pattern as a test signal. Adjust this parameter until

the transients of the colour part and black and white part

of the test pattern are at the same position.

• Lum. Delay Bypass: apply a NTSC colour bar/greyscale

pattern as a test signal. Adjust this value until the

transients of the colour and black & white part of the test

area are at the same position.

EHT compensation

Fixed setting: 5

Al ignments

Gene r a l >

No rma l Geome t r y >

Supe r Wi de Geome t r y >

Op t i o n s >

Op t i o n Numb e r s >

Store >

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