How To Adjust; (I) Brightness Adjustment; Contrast Adjustmen; White Balance Adjustment - Ikegami HTM-1505R Operation Manual

4.1 O How to Adjust
<Introduction>
• The following procedures can realize more accurate adjustment,
when the environment of the monitor is darkened as much as
possible.
• For model R, adjust in accordance· with "How to Change Preset
Data'' mentioned in "4-4", and for model CS, adjust in accordance
with "How to Change Preset Data" mentioned in "4-8".
(1) Brightness adjustment
a) About the brightness
Brightness control is pertbrmed to set a proper black level.
Control it according to the brightness around the monitor so that the
black level may not be excessively high or low.
b) Control Procedures
CD
lnputSignal
Select a gray scale with pluge of the built-in test signal.
®
Brightness Control
Lower brightness gradually while observing pluge portion at the
center of signal, and adjust to such a degree that the brightness of
po1tion A (-2%) and pmtion B. (0%) can be visually dis-
criminated.
Check that portion C (+2%) glares slightly at this time.
!fit cannot be discriminated, the black level is excessively lowered.
Increase brightness until pmtion C glares slightly.
Portion A
-2%
Portion B
0%
PortionC
+2%
Fig. 4-9-1 Plugeportion
(2) Contrast adjustment_
a) About the contrast
Contrast has been controlled to optimum luminance when the
monitor is shipped from the fuctory.
b) Notes
If tl1e monitor is used in an excessively brightened state (OVER
LOAD LED lights up), the life of CRT will shorten.
Usually, use preset data at the value mentioned in Control
Procedures.
c) Control procedures
CD
Input Signal
Input window signal (IO0%) or select window signal of the
built-in test signal.
®
Measure the brightness value of window portion with a
luminance meter, and adjust CONTRAST to 120nit(cd/m') or
35ft(s).
HTM-1505R/HTM-1505CS
(3) White balance adjustment
a) About the white balance
Four kinds of data have been set to the following color tem-
perature as data of white balance at the time of factory shipment:
Refrence:
FILE I:
FILE2:
FILE3:
6500K
6500K
9300K
6500K
* The method of white balance ac(justment using an analyzer and
the method of white balance aqjustment using ASP-80 [option]
for automatic aqjustment are available.
*
When memorizing the user's original color temperature data in a
file, use FILE 3.
b) Note
As this monitor uses a beam feedback clamp method to detect and
clamp beam current so as to stabilize the black level for a long
period of time, it displays one line (portion A shown in Fig. 4-10-2)
on the upper part of CRT.
S
PorlionA
Line of bean feedba::k
'
Portion B
Line of SET-UP with vertical deflection conlra::ted
Fig. 4-10-2 Status of SET UP
When BACKGROUND is lowered to such a degree that portion B
of Fig. 4-10-2 disappears, the line in po1tion A will also disappear,
making it impossible to detect beam current Consequently, only
the image of such lowered color will disappear.
Be careJiJI of such phenomenon sutficiently, when adjusting
BACKGROUND.
c) Adjustment procedure -1 -Visual aqjustment-
CD
Input Signal
Input a color bar signal or select a gray scale with pruge of the
built-in test signal.
®
Setting a tile
Select a file for which white balance is changed.
Control brightness and contrast properly before white balance
adjustment/
@ Setting before BACKGROUND adjustment
For color bar signal, turn on MONO switch on the front panel to
display a monochrome screen. Turn on SET-UP switch in the
drawer panel, and adjust as follows:
©
Initial adjustment of low light level
With SCREEN switch (Red) alone turned on (only red screen),
adjust R. BACKGROUND data to such
a
degree that the red
line in pmtion B in Fig. slightly glares.
With SCREEN switch(Green) alone turned on ( only green screen),
adjust G. BACKGROUND data to such a degree that the green
line in pmtion B in Fig. slightly glares.
With SCREEN switch (Blue) alone turned on (only blue screen),
adjust B. BACKGROUND data to such a degree that the blue
line in prntion B in Fig. slightly glares.
When any one of R, G and B BACKGROUND cannot be
aqjusted until the above-mentioned adjustment, move SCREEN
volume of the tlyback transfonner on HY OUT BOARD
slightly and reaqjust BACKGROUND.
35