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5
8
Adjust R527 so that the DC Voltage at E503 becomes 1.3
V DC as shown in Fig. 4-1.
Fig. 4-1
(3). Preamp. Output Gain Adjustment
Test Point:
E301 (G-IN)
Preamp. Board
E201 (G-IN)
Preprocess Board
E301 (B-IN)
Preprocess Board
E101 (R-IN)
Preprocess Board
Adjust:
R355 (G-GAIN)
Preamp. Board
R363 (G-DC2)
Preamp. Board
R155 (B-GAIN)
Preamp. Board
R163 (B-DC2)
Preamp. Board
R555 (R-GAIN)
Preamp. Board
R563 (R-DC2)
Preamp. Board
8
Connect the Oscilloscope to E301 on the Preamp. Board.
8
Adjust the Lens Focus to obtain correct focal point.
8
Set the Lens Iris so that the peak level of the Gray Scale
from the Blanking level becomes 200 mVp-p as shown in
Fig. 4-2.
Fig. 4-2
8
Change the connection of the Oscilloscope to E201 on the
Preprocess Board.
8
Adjust R355 so that the Gch Signal level at E201
becomes 300 mV as shown in Fig 4-3.
8
Set the Oscilloscope to the DC mode.
8
Adjust R363 so that the Gch DC Voltage at E201
becomes 100 mV DC as shown in Fig 4-3.
Fig. 4-3
8
Change the connection of the Oscilloscope to E301 on the
Preprocess Board.
8
Adjust R155 so that the Bch Signal level at E301 becomes
300 mV as shown in Fig 4-4.
8
Set the Oscilloscope to the DC mode.
8
Adjust R163 so that the Bch DC Voltage at E301 becomes
300 mV DC as shown in Fig 4-4.
Fig. 4-4
8
Change the connection of the Oscilloscope to E101 on the
Preprocess Board.
8
Adjust R555 so that the Rch Signal level at E101 becomes
300 mV as shown in Fig 4-3.
8
Set the Oscilloscope to the DC mode.
8
Adjust R563 so that the Rch DC Voltage at E101 becomes
100 mV DC as shown in Fig 4-3.
(4). White Clip Adjustment
Test Point:
E101 (R-IN)
Preprocess Board
E201 (G-IN)
Preprocess Board
E301 (B-IN)
Preprocess Board
Adjust:
R701 (G-WCLP)
Preamp.-Sub Board
R705 (R-WCLP)
Preamp.-Sub Board
R707 (B-WCLP)
Preamp.-Sub Board
8
Observe at E101, E201 and E301 by the Oscilloscope.
8
Turn R701, R705 and R707 so that the signals are not
clipped.
8
Aim the Logarithmic Gray Scale Chart.
8
Set the Lens Iris by two digit to open direction.
8
Connect CH1 of the Oscilloscope to E201 and CH2 of the
Oscilloscope to E101.
Ground
Level
Level
1.3 V DC
200 mVp-p
300 mVp-p
100 mV DC
300 mVp-p
300 mV DC
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