Alignments
8.
8.3
RF AGC Adjustment
1.
Connect a test circuit as depicted in figure “Test circuit”.
2.
Apply a color bar signal (80 dB
μ
V).
3.
Adjust the AGC data until the output of the test circuit
becomes 0.6 V (p-p)
±
0.05 V.
4.
Change the color bar signal to 60 dB
μ
V.
5.
The shown value of CRO should be the same as while
receiving the 80 dB
μ
V signal. If not, repeat step 3 and 4
until the results for 60 dB
μ
V and 80 dB
μ
V input signal are
the same.
Figure 8-2 Test circuit
8.4
Screen & Focus Voltage Adjustment
1.
Apply the test pattern signal in normal status.
2.
Enter the Factory mode.
3.
Press the "TV/AV" button to stop the vertical scan (Note:
the RC/GC/BC is preset to 80, 80, 80-/44; 65, 80, 80-/85.
GD/BD is preset to 40).
4.
Adjust the SCREEN potentiometer on the line output
transformer in such a way the horizontal line is just visible
on the screen.
5.
Measure the VG2 voltage with a High Voltage Meter and a
High Voltage Test stick (1000:1). The VG2 voltage should
be 665
±
85 V for SDI tubes and 800
±
60 V for HuiFei tubes.
6.
Turn on the vertical output, and adjust the "FOCUS"
potentiometer on the line output transformer in such a way
the focus is maximized. The “FOCUS” voltage should be
within the range of 6 - 8.0 kV for SDI tubes and 7 - 11.0 kV
for HuiFei tubes.
8.5
Sub-contrast, Sub-tint and Sub-color
adjustment
Note:
the following adjustments are only applicable in case of
a CRT exchange. Otherwise, do not adjust these values.
1.
Set “Brightness”, “Contrast”, “Color” and “Tint” to 50.
2.
Connect the probe of an oscilloscope to the conjunction
between R201 and P201 (B-out).
3.
In STANDARD status, apply the grey-scale/color-bar
(NTSC) signal to the AV/TV input.
4.
Select CNTC to adjust the contrast, until amplitude “A” is
2.0V (p-p). Refer to figure “Waveform video signal”.
5.
Select COLC to adjust the color by tuning the amplitude of
“a” and “d” to the same magnitude.
6.
Select TNTC to adjust the tint by tuning the amplitude “b”
and “c” to the same magnitude.
7.
In STANDARD status, apply the grey-scale/color-bar (PAL)
signal to the AV input.
8.
Select COLP to adjust the sub-color by tuning the
amplitude of “a”, “b”, “c” and “d” to the same magnitude.
Figure 8-3 Waveform video signal
8.6
White Balance Adjustment
8.6.1
/44 Region sets
Normal color temperature adjustment.
1.
Apply the following black and white pattern in Natural
status: black side: Y = 5
±
1 Nits (
≅
low light); white side: Y
= 80
±
10 Nits (
≅
high light).
2.
Change the color temperature to Normal Status.
3.
Use a color analyzer to measure the black side of the
screen. By changing the value of RC, GC and BC, set the
reading of the color analyzer to Standard.
4.
Use a color analyzer to measure the white side of the
screen. By changing the value of GD and BD, set the
reading of the color analyzer to Standard.
5.
Separately, set the brightness and contrast from minimum
to maximum, and repeat step 3 and 4 until the reading of
the color analyzer is correct.
Cool color temperature adjustment.
1.
Change RC-W, GC-W, BC-W, GD-W and BD-W until the
reading of the color analyzer is correct.
Warm color temperature adjustment.
1.
Change RC-C, GC-C, BC-C, GD-C and BD-C until the
reading of the color analyzer is correct.
CVI color temperature adjustment.
1.
Set Color Temperature to Normal status.
2.
Change YUV-RC, YUV-GC, YUV-BC, YUV-GD and YUV-
BD until the reading of the color analyzer is correct.
8.6.2
/85 Region sets
Normal color temperature adjustment.
1.
In Rich status, apply a white pattern 27 IRE (192.8 mV).
2.
Measure the picture with a color analyzer and adjust RC,
GC and BC.
3.
Apply a white pattern 67 IRE (478.57 mV).
4.
Measure the picture with a color analyzer and adjust GD
and BD.
5.
Repeat steps 1 to 4 until you get the right color temperature
on both dark and bright pictures.
Cool color temperature adjustment.
1.
Adjust RC-C, GC-C, BC-C, GD-C and BD-C until the
reading of the color analyzer is correct.
Warm color temperature adjustment.
1.
Adjust RC-W, GC-W, BC-W, GD-W and BD-W until the
reading of the color analyzer is correct.
CVI color temperature adjustment.
1.
Adjust YUV-RC, YUV-GC, YUV-BC, YUV-GD and YUV-BD
until the reading of the color analyzer is correct.
8.6.3
Reference values
See table “Standard settings” for reference.
Table 8-1 Standard settings
H_174
8
0_007.ep
s
050707
Q101
C1
33
pF
D2
D1
1N60
C2
TO CRO
100pF
R1
100k
1N60
A
a
b
c
d
H_176
3
0_017.ep
s
271107
Picture Mode
X
Y
Cool
263
±
8
265
±
8
Normal
274
±
8
280
±
8
Warm
291
±8
300
±
8