Panasonic OmniVision PV-M1326, Руководство по обслуживанию, Страница: 40 / 173

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9. SUB BRIGHTNESS ADJUSTMENT
Purpose :
To set the optimum brightness level.
Symptom of Misadjustment :
The picture is too white or too black.
(SETUP)
1. Perform this adjustment in a darkened room.
2. Reset the control levels to the factory -set levels
using the remote control.
TP ADJ. MODE INPUT
R5907 STOP
TAPE M.EQ. SPEC.
Refer to descriptions
below
Note :
R5907 : TV Y/C Process Section on the VCR
Main C.B.A.
1. Do not input any signal to the unit.
2. Set input select item to Line in OSD to display black
screen.
3. Adjust R5907 (SUB BRIGHTNESS) so that the black
screen starts to turn grey (lighting only).
Method 2 (Alternative to Method 1)
1. Supply white pattern signal.
2. Adjust R365 (R-DRIVE) and R363 (B-DRIVE) so that
the whole screen is white.
3. Turn R5907 (SUB BRIGHTNESS) fully counterclockwise
for minimum level.
4. Adjust (R369 (B-CUT OFF), R370 (G-CUT OFF) or
R371 (R-CUT OFF)) VR of colors which are not
observed so that the whole screen is white.
5. Turn R5907 (SUB BRIGHTNESS) and confirm that the
screen is tracking the white pattern properly.
Repeat the above steps 2 to 4 until the screen is
properly tracking the white pattern.
8. WHITE BALANCE ADJUSTMENT
Purpose:
To set the standard white level for each color
temperature.
Symptom of Misadjustment :
White becomes bluish or reddish.
TP ADJ. MODE INPUT
R363, R365, STOP (VIDEO IN)
R369, R370, LUMINANCE
R371 PATTERN SIGNAL
TAPE M.EQ. SPEC.
NTSC VIDEO PATTERN Refer to descriptions
GENERATOR below
WHITE BALANCE METER
Note :
R363, R365, R369, R370, R371 : CRT C.B.A.
(SETUP)
1) Set the following control levels using the remote
control.
Color : Min.
Tint : Center
Brightness : Center
Picture : Max.
Sharpness : Center
Method 1
1. Turn the Screen control on Flyback Transformer fully
counterclockwise.
2. Set the Service Switch on the TV Y/C Process Section
of the VCR Main C.B.A. to Service Position.
3. Turn the Screen Control on Flyback Transformer
clockwise carefully and stop at the point where any
color is first observed.
4. Adjust (R369 (B-CUT OFF), R370 (G-CUT OFF) or
R371 (R-CUT OFF)) VR of colors which are not
observed in step 3 so that the Horizontal line is white.
5. Set the Service Switch to the Normal Position.
6. Place the photo sensor foot for "JUST FIT" to the
CRT.
7. Set the R5907 (SUB BRIGHTNESS) so that the White
Balance Meter (High-Light White, G Meter) is
80µA :
: Model A,B,C,D,E,F,G
or
40µA : Model : H,I,J,K,L
.
8. Adjust R365 (R-DRIVE) and R363 (B-DRIVE) so that
the White Balance Meter (both R & B Meters) is 0
µ
A.
9. Set the R5907 (SUB BRIGHTNESS) so that the White
Balance Meter (Cut OFF White, G Meter) is 50
µ
A.
10. Adjust R371 (R-CUT OFF) and R369 (B-CUT OFF) so
that the White Balance Meter (both R & B Meter) is
0
µ
A.
11. Repeat step 7 and 8 until both R and B read 0
µ
A in
the High-Light and Low-Light Modes.