2
MITSUBISHI CT 29BV1 BD
2.4.5 Height and linearity
Code: 00 (0 VH5) [V-AMP]
Code: 04 (4 LIN) [V-LIN]
1. Connect a VCR and play a PAL-Monoscope
alignment tape.
2. Select the VCJ adjustment display.
3. Set the adjustment code to 00 (0 VH5) with
buttons “2” or “8” on the remote control.
4. Adjust the circle to a true circle with buttons
“4” or “6” on the remote control.
5. Set the adjustment code to 04 (4 LIN) with
buttons “2” or “8” on the remote control.
6. Adjust the linearity to be the same for the top
and bottom halves of the circle using buttons
“4” or “6” on the remote control.
7. Set the adjustment code to 00 (0 VH5) with
buttons “2” or “8” on the remote control.
8. Readjust V-AMP with buttons “4” or “6”.
9.
Repeat the steps above, if necessary.
2.4.6 Vertical centre
Code: 08 (7 VS5) [V-SHIFT-50]
1. Connect a VCR and play a PAL-Monoscope
alignment tape.
2. Select the VCJ adjustment display.
3. Set the adjustment code to 08 (7 V55) with
buttons “2” or “8’ on the remote control.
4. Adjust the centre line of picture to be /
- 3mm from the vertical centre on the screen
using buttons “4” or “6” on the remote control.
2.4.7
60Hz Deflection circuit offsets
Code: 14 (8 VH6)
[V-AMP-60]
Code: 15 (9 PA6)
[P-AMP 60]
Code: 16 (12 HW6)
[H-AMP 60]
Code: 17 (13 VS6)
[V-SHIFT 60]
Code: 18 (14 HP6)
[H-PHASE 60]
1. Connect an RE 60Hz Crosshatch signal.
2. Select the VCJ adjustment display.
3. Select each adjustment code in turn with
buttons “2” or “8” on the remote control and
adjust each item to the figures shown in table
2.4C below using buttons “4” or “6” on the
remote control.
CODE:
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VALUE:
14
8 VH6
+7
15
9 PA6
+2
16
12HW6
- 2
17
13VS6
+8
18
14HP6
-5
table 2.4C 60Hz adjustment offsets
2.5 CRT CIRCUITS
2.5.1 White balance
Code: 0A (1 BDR) [B-DRIVE]
Code: 0B (2 GDR) [G-DRIVE]
Code: 0C (3 RDR) [R-DRIVE]
1. Connect a VCR and play a PAL-Monoscope
alignment tape.
2. Select the VCJ adjustment display.
3. Set the adjustment codes to 0A (1 BDR), 0B
(2 GDR) and 0C (3 RDR) in turn and pre-
adjust each to “+10”.
4. Adjust codes 0A (1 BDR) and OC (3 RDR) to
adjust the white balance.
2.5.2 Focus
FOCUS control on the Flyback Transformer
1. Connect an RF signal such as an off-air
broadcast.
2. Adjust the FOCUS control for the best overall
focus.
2.5 VIDEO CIRCUITS
Perform the following adjustments after
adjusting the Deflection circuits. Allow the TV to
warm up for 20 minutes before proceeding
2.6.1 Brightness and Contrast
SCREEN control on the Flyback Transformer
Code: 0F (6 COL) [COLOUR SATURATION]
Code: 0E (S BRI) [BRIGHTNESS]
Code: 0D (4 CON) [CONTRAST]
BEAM CURRENT (using connector TP adjacent
to the Flyback Transformer)
1. Connect a Black raster signal to the RE or AV
input.
2. Select the VCJ adjustment display.
3. Connect an oscilloscope to the junction of
R673 and wire link W603.
4. Adjust the SCREEN control on the Flyback
Transformer to give a voltage of 170V as
shown in fig. 2.6A.
5. Change the external signal to a G-Card.
6. Set the adjustment code to 0F (6 COL) with
buttons “2” or “8” on the remote control.
7. Adjust the data value to “-32” with buttons “4”
or “6” on the remote control.
8. Set the adjustment code to 0E (5 BRI) with
buttons “2” or “8” on the remote control.
9. Adjust using buttons “4” or “6” so that a slight
difference in brightness can be seen between
blue and black areas.
10.Connect a DC ammeter’s “+” lead to
connector TP pin 1 on the MAIN-PCB and the
“-“ lead to connector TP pin 2.
11.Adjust the beam current using buttons “4” or
“6” on the remote control to 1300
±
20
µ
A.
12.Check, and if necessary, readjust the
BRIGHTNESS, code OE (5 BRI).
13.Check that the Screen Up/Down Request Bit
is “00”. If not, repeat steps 1 to 4 above.
14.Now proceed to the Colour Output adjust-
ment.
2.6.2 Colour output
Make this adjustment only after adjusting the
White Balance, Brightness and Contrast.
Code: 0F (6 COL) [COLOUR SATURATION]
1. Connect an RE Colour-bar signal.
2. Select the VCJ adjustment display.
3. Set the adjustment code to 0F (6 COL) with
buttons “2” or “8” on the remote control.
4. Connect an oscilloscope to the junction of
R673 and IC660 Pin 9 (BLUE-OUT) on the
CRT PCB).
5. Make adjustments using buttons “4” or “6” on
the remote control until the waveform is as
shown in figure 2.6A.
2.7 POWER CIRCUIT
2.7.1 B4 Voltage
VR951 (on main PCB next to the SMT)
1. Connect a VCR and play a PAL-Monoscope
alignment tape.
2. Push the OPTIMUM button on the remote
control.
3. Connect a DC voltmeter’s “+” lead to TP91 on
the MAIN PCB and the “—“ lead to GROUND.
4. Adjust VR951 so that the voltage is 145
±
2V.
Adjustments Cont’d
Text PCB Diagram