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8. Electrical Alignments
Index of this chapter:
1. Introduction.
2. Option settings.
3. Hardware alignments.
4. Software alingnments.
Notes: The Service Default Mode (SDM) and Service
Alignment Mode (SAM) are described in chapter 5. Menu
navigation is done with the 'CURSOR UP, DOWN, LEFT or
RIGHT' keys of the remote control transmitter.
8.1
Introduction
8.1.1
Start Conditions
Perform all electrical adjustments under the following
conditions:
•
Power supply voltage: 230 V
•
Connect the set to the mains via an isolation transformer
with low internal resistance.
•
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).
•
Caution: never use the cooling fins/plates as ground.
•
Test probe: Ri > 10 MΩ, Ci < 20 pF.
•
Use an isolated trimmer/screwdriver to perform the
alignments.
Perform all electrical adjustments with the following start
settings (for all CRTs):
•
Set LIGHT SENSOR 'off' (set ACTIVE CONTROL to 'off'
with the remote control).
•
Set BRIGHTNESS to '23' (via PICTURE menu, set
indicator somewhat below the centre (= 32) point).
•
Set COLOUR ENHANCEMENT to 'off' (via PICTURE
menu).
•
Set DIGITAL OPTIONS to 'Pixel Plus' (via PICTURE
menu), unless otherwise stated.
•
Set DYNAMIC CONTRAST to 'off' (via PICTURE menu).
•
Set CATHODE DRIVE at '15' (via SAM - Alignments -
General - Drive - Cathode).
8.1.2
Adjustment Sequence
Use the following adjustment sequence:
1. Modules, units and PWBs.
2. Set the correct TV-set 'options'.
3. Rough adjustment of 'Vg2' and 'Focus'.
4. Rough adjustment of 'Geometry'.
5. Accurate adjustment of 'Vg2' and 'Focus'.
6. Rough adjustment of 'Geometry'.
7. Software alignments (cut-off, cathode drive, peak white,
white drive, etc).
8.1.3
Factory Default Settings
In case something goes wrong during the alignments, use the
following factory default settings:
•
Contrast = 48 (≈ 3/4 of scale).
•
Colour = 33 (28"), 32 (32"), or 31 (36").
•
Sharpness = 3.
•
Colour Enhancement = On.
•
Tint = Normal.
•
Digital Options = Pixel Plus.
•
Dynamic Contrast = Medium.
Electrical Alignments
/50 Hz (± 10 %).
AC
MG3.2E
8.2
Option settings
The microprocessor communicates with a large number of I
ICs in the set. To ensure good communication and to make
digital diagnosis possible, the microprocessor has to know
which ICs to address. The presence/absence of these specific
ICs (or functions) is made known via the option codes.
You can set the 'hardware related' options via the SAM:
'Alignments - Options' or 'Option Numbers' menu.
You can set the 'software related' options via the SAM: 'Dealer
Options' menu .
Important:
•
After you have changed the option(s), save them via the
'Store' command.
•
The new option setting is only active after the TV is
switched 'off' and 'on' again via the mains switch (the NVM
is then read out again).
8.2.1
Options
Select this sub-menu to set the initialisation codes (= options)
of theTV via text menu's.
8.
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