Alignments
EN 71
SDI PDP 2K7
8.
8.4
Alignments 50” HD W2 & 50” HD W2 Plus
8.4.1
Quick Check
For a quick check on the correct Y-main waveform alignment,
use the following method: Check the position of the potmeter
VR5500 [1]. If it points in this direction [2], use a trimmer [3] to
return it to the correct position [1].
Figure 8-25 Correct position of VR5500 [1]
Figure 8-26 Wrong position of VR5500 [2]
Figure 8-27 Changing of VR5500 [3]
8.4.2
For Reference Only
1.
Set the pattern to Full White:
•
Place jumper CN2007 (pins 3 and 4) on the Logic
Board
•
When the display starts showing a cycle of different
patterns, push button SW2000 for at least one second.
Now the display shows a continuous full white pattern.
To restart the cycle of different patterns, push the
button once more and wait for a few seconds.
2.
Check the waveform using an oscilloscope (see figures
“Adjusting waveforms - 50” HD W2”).
•
Trigger via V_TOGG on the Logic Board (see figure
“Logic PWB 50” HD W2”).
•
Connect the “OUT240” test point, located at the centre
of the Y-buffer PWB, to the other channel, and then
check the first Sub-Field (SF) waveform of one TV-
Field.
•
Check the waveform by adjusting the “horizontal
division” of the oscilloscope.
•
Check the Reset waveform when the V_TOGG level is
changed.
3.
Adjust the waveform of the rising ramp with VR5200.
4.
Adjust the waveform of the falling ramp with VR5500.
Figure 8-28 Logic PWB - 50” HD W2
H_16870_077.eps
120407
H_16870_078.eps
120407
H_16870_079.eps
120407
H_16870_073.eps
110407
V-TOGG
JUMPER
CN2007
PIN 3 & 4
SW 2000
