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BT-S1
B.INTERNAL
ADJUSTMENTS
When
measuring voltage with
a VI VM, be sure to use the
test points located
on the conductor side of the circuit
boards.
VERTICAL
POSITION
ADJUSTMENT
Adjust
V-Position
control
(R418)
until picture becomes
vertical center.
—H-RASTER CENTER ADJUSTMENT
Adjust
H-Raster
Center
control
(R520)
until picture
becomes centered horizontally.
UNDERSCAN
V. SIZE ADJUSTMENT
1. Apply a monoscope
pattérn to the monitor,
~~
>
2, Push Underscan switch on the front panel.
3, Adjust U.S. V-Size control (R411) until picture height
becomes
4 mm + 1 mm shorter than picture tube screen
at top and bottom as shown in figure 3.
4. If the picture is shifted upper or lower, adjust V-Position
control (R418).
UNDERSCAN
H. SIZE ADJUSTMENT
1. Apply a monoscope pattern to the monitor.
?, Push Underscan switch on the front panel.
3. Adjust
H-Size
control
(R566) until
picture width
becomes 6 mm + 1 mm shorter than picture tube screen
at both sides as shown in figure 3,
4. if the picture is shifted left 'or right, adjust H-Raster
Center control (R520).
6mm+
1mm
4mm
+ 1mm
4mm
+ 71mm
Figure 3
PULSE CROSS V-POSITION ADJUSTMENT
le
2
3.
Apply a monoscope pattern to the monitor.
Push Pulse Cross switch on the front panel.
Adjust P.C. V-Position control (R428) until horizontal
blanking line becomes at the vertical center on picture
tube screen.
(See figure 4.)
PULSE
CROSS
H-POSITION
ADJUSTMENT
+;
Z
3.
Apply a monoscope pattern to the monitor.
Push Pulse Cross switch on the front panel.
Adjust P.C. H-Position control
(R555) until the length
between
left
screen
edge and
vertical
blanking
line
becomes approximately 35 mm.
(See figure 4.)
35 mm+
1mm
Figure 4
SUB-BRIGHTNESS
CONTROL
ADJUSTMENT
This is factory adjusted.
Usually no further adjustment is
required in the field. However, when the A-Board, C-Board
or CRT is replaced, the following adjustment is necessary:
1
Note:
ae ()
. Apply across hatch pattern signal,
2. Set Brightness
(R350) and Contrast (R344) controls at
their click position.
. Connect
the DC voltmeter between TP85 and TP86
(positive lead of the voltmeter to TP85 and negative
lead to TP86).
. Adjust
Sub-Brightness
control
(R331)
so
that
the
reading of the voltmeter becomes
approximately 5.5V
for proper picture brightness.
|
For this adjustment NTSC Pattern Generator, model
LCG-396
manufactured
by
Leader
Corp. (Japan) is recommended.
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