Alignments; General Alignment Conditions; Start Conditions; Initial Settings - Philips 50pf9966 Service Manual

8. Alignments

Index of this chapter:

1. General alignment conditions

2. Hardware alignments
3. Software alignments
4. Option settings
8.1
General Alignment Conditions
8.1.1

Start Conditions

Perform all electrical adjustments under the following
conditions:
•
Power supply voltage (depends on region):
–
EU: 230 V / 50 Hz (± 10 %).
AC
–
US: 120 V / 60 Hz (± 10 %).
AC
–
AP: 120 V or 230 V
AC
•
Connect the set to the mains via an isolation transformer
with low internal resistance.
•
Allow the set to warm up for approximately 10 to 15
minutes.
•
Measure voltages and waveforms in relation to chassis
ground (with the exception of the voltages on the primary
side of the power supply).
Caution: never use heatsinks as ground.
•
Test probe: Ri > 10 Mohm, Ci < 20 pF.
•
Use an isolated trimmer/screwdriver to perform
alignments.
8.1.2

Initial Settings

Perform all electrical adjustments with the following initial
settings (via the "Active Control" button on the RC):
1. To avoid the working of the lightsensor, set "Active Control"
to "Off".
2. Set "Smart Picture" to "Natural".
3. Set "Active Display" to "Off"
8.1.3
Alignment Sequence
•
First, set the correct options:
–
In SAM, select SERVICE OPTIONS -> OPT. NO,
–
Fill in the option settings according to the set sticker
(see also paragraph "Option Settings"),
–
Select STORE OPTIONS and push "OK" on the
remote control,
–
After storing, the set must be restarted!
•
Warming up (>10 minutes).
•
White-D alignment.
8.2
Hardware Alignments
No hardware alignments are necessary.
8.3
Software Alignments
Put the set in SAM mode (see the "Service Modes, Error Codes
and Fault Finding" section). The SAM menu will now appear on
the screen. Select ALIGNMENTS and go to one of the sub
menus. The alignments are explained below.
Notes:
•
All changes must be stored manually.
•
If an empty EAROM (permanent memory) is detected, all
settings are set to pre-programmed default values.
/ 50 Hz (± 10 %).
AC
Alignments FTP2.2U AA
8.3.1
GENERAL
For the next alignments, supply the following test signals via a
video generator to the RF input:
•
EU/AP-PAL models: a PAL B/G TV-signal with a signal
strength of at least 1 mV and a frequency of 475.25 MHz
•
US/AP-NTSC models: an NTSC M/N TV-signal with a
signal strength of at least 1 mV and a frequency of 61.25
MHz (channel 3).
LUMA GAIN
Fixed setting of "1".
DELTA LUMA GAIN FOR AUX (only when a 2nd Tuner is
present)
Fixed setting of "0 dB".
IF AFC
Alignment procedure:
1. During the IF AFC-parameter adjustment, one can see
OSD feedback on the screen.
2. The OSD feedback can give 4 kinds of messages:
3. The first item ("IN/OUT") informs you whether you are in or
out of the AFC-window.
4. The second item ("HIGH/LOW") informs you whether the
AFC-frequency is too high or too low.
Table 8-1 AFC
AFC-window
Out
In
[ In ]
Out
1. Adjust the IF AFC parameter until the first value is within
the AFC window (= IN).
2. Next, adjust the IF AFC parameter until the second value
is LOW.
TUNER AGC
Measure the DC voltage on pin 1 of the (main) Tuner. You can
adjust this voltage by adjusting the TUNER AGC item in the
SAM menu. Alignment is correct when the DC voltage is just
below 3.5 V.
IF AFC TUNER 2 (only when a 2nd Tuner is present)
Use the same procedure as described above (under IF AFC)
with the set switched to the DW source.
TUNER AGC TUNER 2 (only when a 2nd Tuner is present)
Use the same procedure as described above (under TUNER
AGC) with the set switched to the DW source. Measure on pin
1 of the DW Tuner.
BLEND INTENSITY
Use this alignment when you replace the microcontroller, NVM,
or the EBILD. It aligns the level of transparency of the menu-
picture blended into the main-picture. Fixed setting of "16".
8. EN 97
AFC-frequency vs. reference
High
High
[ Low ]
Low