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ALIGNMENT PROCEDURE ( UNIT FACING EAST)
Power supply voltage is 120VAC
160Hz
or 220VAC (240VAC)
150Hz
(OPTION)
1.
POWER SUPPLY OUTPUT VOLTAGE (FBT B
+ )
Connect a DVM to the anode of D615 (GT pin
is standing) and adjust the voltage to 54V using
VR601.
CONDITION:
1). NO SIGNAL
2).CONTRAST, BRIGHTNESS is MINIMUM
(0 BEAM)
2.
MAIN PCB ADJUSTMENT
Unless special comment, adjust the EXT VR at
the mechanical center paint.
2-1)
H-RASTER CENTERING
Turn the SCREEN VR so that background
raster can be seen and control the H-CEN-
TER S/W (SW401) so that the background
raster is on the center of CRT. This must be
done in EGA MODE (MODE 2
I
21.8KHz).
2-2)
H-HOLD ADJUSTMENT
(a) Disconnect the signal cable
(b) Connect the frequency counter at the H-DY
WIRE (RED wire) and adjust the frequency
in range of 15.700KHz
+
I-50Hz
using
CGNEGA H-HOLD VR (VR405).
*
Frequency of EGA (MODE 2/21.8KHz) is ad-
justed automatically.
2-3)
V-HOLD ADJUSTMENT
(a) Disconnect the signal cable.
(b) Connect the frequency counter at R304(side
of IC301) and adjust the frequency in the
range of 56Hz
+
1-1
Hz using V-HOLD
VR(VR306).
*
If the vertical frequency from PC is 50Hz,adjust
the vertical frequency at 46Hz
+
1-1
Hz.
2-4)
H-LINEARITY ADJUSTMENT
(a) Connect the signal cable.
(b) Adjust L403 to the optimum linearity in
MODE 1 and MODE 2 linearity pattern.
-13-
2-5)
H-POSITION
(a) Adjust H-CENTER VR (VR407) to the center
of the picture when the signal of MODE 2
is applied.
(b) Change mode to CGA MODE (MODE
1/15.75KHz) and adjust H-CENTER VR
using CGA H-POSI VR(VR403}.
2-6)
SIDE PINCUSHION
Adjust the side pincushion to the optimum
side pincushion using VR305.
2-7)
H-WIDTH
a) Adjust the H-WIDTH using width coil (L402)
so that H-WIDTH is adjusted in the range
250
+
4/-2MM in MODE 2 .
b) Check the H-WIDTH of MODE 1.
*
H-WIDTH of MODE 1 is adjusted in the range
250
+
I-4MM automatically.
2-8)
V-POSITION
Adjust the center of vertical using
v-pas
I
VR(VR306).
*
The V-POSI VR (VR306) can control vertical
center of MODE 1,MODE 2 together.
2-9)
V-SIZE
a) Adjust V-SIZE using V-SIZE VR (VR 307) so
that vertical size is 172MM in MODE 2.
b) Change to MODE 2 and adjust vertical size
to 172MM, equal to MODE 2 vertical size,
using CGA V-SIZE(VR402).
2-10) FOCUS ADJUSTMENT
Adjust the focus control to the optimum
position.
2-11) BLACK AND WHITE TRACKING
a) Turn the screen control fully clockwise. Turn
the red,green and blue bias controls
mechanical centers. Set the brightness con-
trol and the red and blue drive controls at
the center positions.
b) Turn the SW301 to the left.
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