Panasonic PV-M1348, Руководство по обслуживанию

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2-34
50V
5ms
A
TP50
DC GND
SUB BRIGHTNESS ADJUSTMENT
Purpose :
To set the optimum brightness level.
Symptom of Misadjustment :
The picture is too white or too black.
Note:
Perform this adjustment in a darkened room.
Test Point : ----------
Adjustment : SUB BRIGHT (EVR)
Specification: Refer to descriptions below.
Input
: ----------
Mode : STOP
1. Do not input any signal to the unit.
2. Set INPUT SELECT item to LINE in SET UP TV menu to
display black screen.
3. Select SUB BRIGHT in EVR adjustment mode, and adjust
so that the black screen starts to turn grey (lighting only).
WHITE BALANCE ADJUSTMENT
Purpose:
To set the standard white level for each color
temperature.
Symptom of Misadjustment :
White becomes bluish or reddish.
Test Point : TP50 (CRT C.B.A)
Adjustment : FOCUS CONTROL (Flyback Transformer),
SCREEN CONTROL (Flyback Transformer),
SUB BRIGHT (EVR)
G DRIVE (EVR),
B DRIVE (EVR),
R CUT -OFF (EVR),
G CUT -OFF (EVR),
B CUT -OFF (EVR),
Specification: Refer to descriptions below.
Input
: Video Input Jack
Monoscope Pattern Signal,
White Pattern Signal
Mode : STOP
Equipment : NTSC Video Pattern Generator,
White Pattern Generator, Oscilloscope,
1. Supply a Monoscope Pattern Signal to the Video Input
Jack.
2. Connect the Oscilloscope to TP50 on the CRT C.B.A.
(Use TP47E for GND.)
3. Select SUB BRIGHT and move the shaded area to the
value in EVR adjustment mode.
4. Adjust the FOCUS CONTROL on the Flyback Transformer
so that the center of picture is the sharpest.
5. Press DISPLAY key (Service Switch) on the remote control
for collapse scan. (Refer to How to Enter Service Mode.)
6. Turn the SCREEN CONTROL on Flyback Transformer
fully counterclockwise.
7. Adjust SUB BRIGHT in EVR adjustment mode so that the
level A is (140 +/- 5VDC: Model A, B, C, D, E, F) or (170 +/
- 5VDC Model: G, H, I, J, K).
Fig. E12
8. Turn the SCREEN CONTROL on the Flyback Transformer
clockwise carefully and stop at the point where any color is
first observed.
9. In EVR adjustment mode, select the two colors not observed
in step 8 from the following control functions (B CUT -OFF,
G CUT -OFF, or R CUT -OFF) and adjust so that the
horizontal line becomes white.
For example, if the horizontal line appeared red in step 8,
select and adjust the B CUT -OFF and G CUT -OFF.
10. Supply a White Pattern Signal to the Video Input Jack.
11. Press DISPLAY key on the remote control again to return
for full frame scan.
12. Select G DRIVE and B DRIVE in EVR adjustment mode
and adjust so that the entire screen is white.
13. Select SUB BRIGHT in EVR adjustment mode. Then, after
making a note of the original value, adjust to the minimum
(C0) and while turning SUB BRIGHT value from minimum
(C0) up to maximum (3F), confirm that the screen is
tracking the White Pattern properly.
Repeat the above steps 5, 9, 11, and 12 until the screen is
properly tracking the White Pattern.
Note:
Before pressing DISPLAY key on the remote control for
collapse scan, select the desired control function and move
the shaded area to the value.