Mitsubishi CT-32CW1BD, Руководство пользователя, Страница: 2 / 22

MITSUBISHI CT-32CW1BD
Adjustments Cont’d
9. Write the data into the memory (0 button).
10. Terminate line mode (1 button).
Note: this adjustment is made with the picture
format set to 16:9. Adjustment in any other
picture format is not necessary.
2.6 CRT CIRCUIT
2.6.1 Focus
1. Supply a VIDEO signal (monoscope).
2. Press the MENU button on the remote control
(the MENU display will appear.) then press
buttons 2, 3, 5 and 7 in that order within 4
seconds. (The MENU display will change to
the Line Mode display.)
3. Select the FOCUS ALIGNMENT (* or C
button).
4. Observe the vertical lines and adjust FOCUS-
V control on the Flyback Transformer (T552)
for the best focus.
5. Observe the horizontal lines and adjust
FOCUS-H control on the Flyback Transformer
(T552) for the best focus.
6. Repeat steps 5 and 6 two or more times until
no further improvement is seen.
7. Terminate line mode (1 button).
2.7 VIDEO CIRCUIT
2.7.1 Screen Bias, Cut Off, White balance
Allow the set to warm up for twenty minutes or
more.
1. Supply a PAL VIDEO signal (white raster).
2. Press the MENU button on the remote control
(the MENU display will appear.) then press
buttons 2, 3, 5 and 7 in that order within 4
seconds. (The MENU display will change to
the Line Mode display.)
3. Make adjustments as shown in table 2.7A:
Table 2.7A
4. Select the SCREEN BIAS ALIGNMENT (* or
C button). The screen will change to display a
black picture.
5. Connect an oscilloscope to the cathode of
R684 and observe the waveform.
6. Adjust the SCREEN control on the flyback
transformer (T552) so that the waveform is as
shown in fig 2.7B:
Fig. 2.7B
7. Make adjustments as shown in table 2.7C:
Table 2.7C
8. With a PAL signal supplied, adjust 1 R-GAIN
and 3 B-GAIN for PAL to obtain the best
white.
9. Supply a SECAM white raster signal.
10. Adjust 1 R-GAIN and 2 B-GAIN for SECAM
to obtain the best white.
Note: adjustment 2.6.2 (Black Level) must be
performed immediately after this adjustment.
2.7.2 Black Level
Note: this adjustment must follow adjustment
2.6.1 (Screen Bias, Cut Off, White balance).
1. Supply an RF signal (G-card).
2. Set the picture format to 16:9.
3. Select the VIDEO CIRCUIT ALIGNMENT - 1
(* or C button). Colour will be minimised
automatically.
4. Select item 1 BLACK LEVEL (2 or 8 button).
5. Adjust the data so that a difference in
brightness is just visible between the blue
area and the black area (4 or 6 button).
6. Write the data into memory (0 button).
Note: adjustment 2.6.3 (Sub Contrast) must be
performed immediately after this adjustment.
2.7.3 Sub Contrast
Note: this adjustment must follow adjustment
2.6.2 (Black Level).
1. Supply an RF signal (Colour-bar, 80%
Modulation).
2. Set the picture format to 16:9.
3. Select the VIDEO CIRCUIT ALIGNMENT - 1
(* or C button). Colour will be minimised
automatically.
4. Connect a DC milliammeter between pin 1
and 4 of connector LA on PCB-CRT (+ lead to
pin 1).
5. Select item 2 CONTRAST (2 or 8 button).
6. Adjust the data so that the DC milliameter
indicates 11 00
±
50uA (4 or 6 button).
7. Write the data into memory (0 button).
8. Terminate line mode (1 button).
2.8 CHROMA CIRCUIT
Note: perform this adjustment after the Cut Off,
White balance and Video circuit adjustments.
1. Supply a VIDEO signal (PAL Colour bar).
2. Connect an oscilloscope between TP6B on
PCB-CRT and ground.
3. Press the MENU button on the remote control
(the MENU display will appear.) then press
buttons 2, 3, 5 and 7 in that order within 4
seconds. (The MENU display will change to
the Line Mode display.)
4. Select the VIDEO CIRCUIT ALIGNMENT -2 (*
or C button).
5. Make adjustments as shown in table 2.8A:
Table 2.8A
6. Select item 1 COLOUR SATURATION (2 or 8
button).
7. Adjust the data so that the waveform is as
shown in figure 2.7B (4 or 6 button):
Fig. 2.7B
8. Supply a VIDEO signal (NTSC colour bar).
9. Select item 2 HUE (2 or 8 button).
10.Adjust the data so that the waveform is also
as shown in figure 2.7B (4 or 6 button).
11.Write the data into memory (0 button).
12.Terminate line mode (1 button).
2.9 DEFLECTION CIRCUITS — STAGE 2
1. Supply a VIDEO signal (monoscope).
2. Press the MENU button on the remote control
(the MENU display will appear.) then press
buttons 2, 3, 5 and 7 in that order within 4
seconds. (The MENU display will change to
the Line Mode display.)
3. Make adjustments as shown in table 2.9:
Table 2.9
4. Select item 1 RIGHT BACKGROUND (4:3)
(2 or 8 button).
5. Adjust the data so that the reading of the right
marker is 2 (4 or 6 button).
6. Select item 2 LEFT BACKGROUND (4:3)
(2 or 8 button).
7. Adjust the data so that the reading of the left
marker is 2 (4 or 6 button).
8. Select item 3 LEFT BACKGROUND (14:9)
(2 or 8 button).
9. Adjust the data so that the reading of the left
marker is 2 (4 or 6 button).
10. Write the data into the memory (0 button).
11. Terminate line mode (1 button).
2.10 PIP CIRCUIT
1. Supply a VIDEO signal (monoscope).
2. Press the MENU button, select the PIP menu
and set the PIP style to 1. Press the DISPLAY
button and set the receiver to PIP mode.
3. Display a monoscope signal on the sub-
picture.
4. Press the MENU button on the remote control
(the MENU display will appear.) then press
buttons 2, 3, 5 and 7 in that order within 4
seconds. (The MENU display will change to
the Line Mode display.)
5. Make adjustments as shown in table 2.10A:
Table 2.10A
6. Select item 2 PIP HORIZONTAL POSITION
(2 or 8 button).
7. Adjust the data so that the readings of the left
and right markers are the same on the sub-
picture (4 or 6 button).
8. Using the * or C button select the IC Adjust-
ment display PIP.
9. Select item 9 PSH (2 or 8 button).
10. Adjust the data so that the sub-picture
horizontal positions are adjusted as shown in
fig. 2.10B. Press the PIP POSITION button on
the remote control to select the PIP position
11. Write the data into memory (0 button).
12. Terminate line mode (1 button).
Fig 2.10B
LINE MODE DATA TABLES - SERVICE MODES:
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