Philips L9.2A Service Manual Download

Page: 22 / 35

Alignments

GB 54

L9.2A

To go back to the main SAM-menu , press the MENU key on
the RC.
To leave the SAM-menu and store the alignments in the NVN,
press the STANDBY-key on the RC.

8.3.2

AGC

Set pattern generator (e.g. PM5418) with colour bar pattern
and connect to aerial input with RF signal amplitude - 10mV
and set frequency for PAL/SECAM to 475.25 MHz or
61.25MHz for BTSC.
•

Select the" SAM-MENU.

•

Select at the TUNER sub-menu the option AFW and select
the lowest value.

•

Select the AGC subsub-menu

•

Connect a DC multi-meter at pin 1 of the tuner IC 1000.

•

Adjusting the AGC until the voltage at pin 1 of the tuner is
1.0V +/- 0.1V.

•

The value can be incremented or decremented by pressing
the right/left MENU-button on the RC.

•

Switch the set to standby.

8.3.3

IF-PLL / IF-PLL POS

Set pattern generator (e.g. PM5418) with colour bar pattern
and connect to aerial input with RF signal amplitude - 10mV
and set frequency for PAL/SECAM to 475.25 MHz or
61.25MHz for BTSC.
•

Select the " SAM-MENU".

•

Select at the TUNER sub-menu the option AFW and select
the lowest value.

Within the TUNER-menu we now have two options : IF-PLL
and IF-PLL POS.
The IF-PLL option is used for all PAL/SECAM signal excluding
SECAM L',
The IF-PLL POS option is used for only the SECAM L' signal
For the IF-PLL option the following should be done:
•

Select at the TUNER menu the IF-PLL subsubmenu

•

Adjust the IF-PLL value until the AFA becomes "1" and
AFB alternates between "0" and "1"

•

Switch the set to Standby or go to the IF-PLL POS menu.

For the IF-PLL POS option the following should be done:
•

Change the signal at the pattern generator from PAL to
SECAM and select the L'-signal.

•

Select at the TUNER menu the IF-PLL POS subsubmenu.

•

Adjust the IF-PLL POS value until the AFA becomes "1"
and AFB alternates between "0" and "1"

•

Switch the set to Standby or go to the IF-PLL menu.

8.3.4

Tuner options CL, YD and IF-PLL OFFSET

NO ADJUSTMENTS NEEDED FOR THESE ALIGNMENTS.
The tuner option code IF-PLL-OFFSET is only used in
combination with sets with the TDA8845 BiMOS (IC7250).
(Typically this is for Secam LL'). The default values for these
option codes are:
•

CL : 4

•

YD : 12

•

IF-PLL-OFFSET : 48

8.3.5

White tone

•

Connect a pattern generator (e.g. PM5418) and set it to
colour bar and circle pattern.

•

Set frequency for PAL 475.25MHz or 61.25MHz for BTSC
with RF signal amplitude - 10mv and connect to tuner
(aerial) input

•

Enter the SAM -MENU.

•

Enter into WHITE TONE menu, select item NORMAL,
DELTAWARM, or DELTACOOL depending on the item
which has to be aligned. Only one of the three items (R, G
or B) will be displayed on the screen.

The default values for the colour temperature as displayed in
the table below:

Switch the set to standby.

8.3.6

Audio

NO ADJUSTMENTS NEEDED FOR SOUND.
The default values for the audio alignments as displayed in the
table below:

8.4

Options

Options are used to control the presence / absence of certain
features and hardware. There are two ways to change the
option settings. The various option configurations and the
descriptions of the two character-codes are explained below.
Changing a single option:
A single option can be selected with the MENU UP/DOWN
keys and its setting can be changed with the MENU LEFT/
RIGHT keys.
Changing multiple options by changing option byte values:
Option bytes make it possible to set very fast all options. An
option byte represents a number of different options. All options
of the L9 are controlled via 7 option bytes. Select the option
byte (OB1, OB2, OB3, OB4, OB5, OB6 or OB7) and key in the
new value.
Changes in the options and option bytes settings are saved
when the set is switched to standby. Some changes will only
take affect after the set has been switched OFF and ON with
the mains switch (cold start).
The following options in SDM can be identified: