CTX 1451C/CLR Troubleshooting Manual page 9

5.0 ADJUSTMENT
5.0 ADJUSTMENT
5.1 1451C ADJUSTMENT
voltage adjustment: VR101/SVGA I
1. Use SVGATI timing for input signal.
2. Attach the multimeter (with a DC voltage
range of 200V) between cathod of D111
arid GND, and adjust VR101 to get 85V+
0.2V.
H-FNV adjustment: VR301/SVGA (37.8KHz)
_ Measure the DC voltage between TP3 and
GND, and adjust VR301 to get 9V+0.05V.
Hi-voltage adjustment! VR501 / SVGATI
a. Tum the power switch off before attaching
multimeter with a high voltage probe by a
factor 1000:1 between CRT anode and
GND.
b. Adjust VR501 to make sure the
measurement readings are 24V + 0.5V (ie
CRT anode voltage is 24KV+0.5KV).
Horizontal hold adjustment: VR201/SVGA
Connect TP1 to GND and adjust VR201 to get
picture stand or scroll toward left or right slowly
when input is SVGAT..
. H-PHASE adjustment: EXT VR(VR202) / VGA-
480
' Adjust EXTERNAL H-PHASE to shift picture to
the center of screen.
V-line adjustment. VR801/VGA-480
First adjust V-CENTER EXTERNAL VR to
make picture to the V-center of the screen,
and then adjust VR801 to correct the V-
linearity of crossh-hatch pattern.
1451C/CLR ©
H-WIDTH adjustment VR401/VGA-480
a. Adjust EXTERNAL" H-WIDTH VR to get
picture width just fullscreen. = —
b. Adjust EXTERNAL H-WIDTH VR to.get the
horizontal width of every mode is 252 +
5mm.
V-SIZE adjustment: EXT VR
Adjust EXTERNAL V-SIZE VR to get the
vertical size of every mode is 189+ 7mm.
PINCUSHION adjustment: VR803/VGA-480
Adjust VR803 to parallel the picture's right &
left edge each other.
FOCUS adjustment: FOCUS VR/VGA-480
Adjust FOCUS VR on the FBT to attain a
balariced focus for all points on the screen.
White balance adjustment:
a. Pre adj. & brightness settings (Before
adjusting, CRT must be degaussed.)
(1)Set the VR601,602,603,604,605,606 on
mechanical center, and the Brightness VR
to the click point, the Contrast VR to Max.
(2) Operating on VGA-480 mosaic pattern and
adjust the SCREEN VR to set the raster
luminance between 2 ~ 3FL, are measure
by color Analyzer.
(3) Adjust VR604,605,606 (BIAS VR) to make
C.1.E. coordinates value as x=0.281 + 0.01,
y=0.311 + 0.01 are measured by coor
analyzer.
(4)Change timing to VGA-400 color bar
pattern, correct SCREEN VR whitch on the
FBT to make raster brightness disapper
and the "1" row of color bar pattern (as
below figure) visible obscurely.
(5) Operating or VGA-~480 mosaic pattern
again, check the Brightness of Mosaic
pattern is between 67 ~ 7OFL. if the
brightness isn't net, adjust VR603, to mae
it and return to step(2).
R+B B+G R+G
Pemrness 4g ['aLUE | RED. [PURPLE| GREEN | GREEN |YELLOW) Were |
1§ | BLUE RED |PURPLE GREEN |YELLOW} WHITE | 7
et, Gi a LS Pe DS eee ees Fe
Ws Se a te eee
reduce | 12 4
| 11 3
i wf. | 2 isibte
| 9
1 visible
$ 87 | |] 0 obscurely