Схема телевизора Mitsubishi CT-29BV1
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Recommended Safety Parts
Description
Load Dressing
A68EDG038X301
TRANS-FLYBACK
TRANS-POWER
AUDIO-PWR 103P378060
AUDIO-PWR 103P378060
AUDIO-PWR 103P378060
AUDIO-PWR 103P378060
R-FUSE-METAL
1/2W 0.82-J
1/2W 0.82-J
R-COMPOSITION
R-FUSE-METAL
R-COMPOSITION
1/2W 6.8M-J
R-COMPOSITION
1/2W 6.8M-J
POWER-SUB 109P91 1090
R-COMPOSITION
1/2W 470K-J
POWER-SUB 265P071 050
PTH451 041 BG180N
PHOTOCOUPLER
920A427002*
ASSY-PWB-MAIN
Later models *
H92A002001*
ASSY-PWB-MAIN
Early models *
ASSY-PWB-VM/CRT
ASSY-PWB-POWER-SUB
ASSY-PWB-LED
ASSY-PWB-AUDIO-PWR
ASSY-PWB-TEXT
ASSY-PWB-DOLBY
AC-POWERCORD/U K-PLUG
ASSY BACK COVER
1.4.2 Lead dressingLeads must be dressed as shown in table 1 .4Band the diagram (fig. 1.4C) below. The leads arerouted or clamped so that they do not comeclose to any heat generating or high-tensionparts. The anode lead wire is routed such thatno tension is applied to the anode cap. If themounting angle of the anode cap and the routeof the anode lead wires are changed, returnthem to the initial angle and route.
WIRES CLAMPED
DA, DD, DE, DF (3+4)
DA (looped), KD
DY (Loop the lead twice)
LB, BA (Loop the lead twice)
KD, SC, GA (Loop the lead)
LB (Loop the lead twice), SB, Focus
BA, DF(1+2)
table 1.4B Lead-dressing table.
table 1.4C Lead-dressing diagram.
Adjustments
2.1 introductionMost service adjustments to these models aremade using the remote control (figure 2.1A) withthe TV in service mode. The adjustment data isstored in an EEPROM.
NOTE: The software in the microcontrollerIC701 may be either of 2 versions -EE3 orEE3W. EE3 software is used in IC701 part no.274P755010, EE3W software is used in IC701part no. 274P755040.The actual software in use is shown on theOptions adjustment display - see the nextsection.
2.1.1 Basic adjustment procedure
1.Turn the power on and enter service mode -
either (EE3) press the Service switch (S701,next to the aerial socket) and then button
within 5 seconds (EE3W) press the MENUbutton to display the MAIN MENU thenimmediately key-in 2-3-5-7.
2. Press the "*" button to toggle between the
VCJ or OPTION adjustment display (figs. 2.1B, C, D and E).
3. Press buttons "2" or "8" to increase or
decrease the adjustment code number.
4. Press buttons "6" or "4" to increase or
decrease the data value.
5. After making adjustments, press button "0', to
write the adjustment data to the EEPROM. Tocancel a change, press button "1', and alldata adjusted since the last EEPROM writewill be reset.
2.2 INITIALISING THE EEPROM
If you have replaced the EEPROM (IC702) or iffor any reason the adjustment data has becomecorrupted it will be necessary to initialise theEEPROM.
2.2.1 Initialising the EEPROM
1. If necessary, switch off by the Main switch.2. (EE3) Hold in the service switch (S701, next
to the aerial socket) or (EE3W) connect pin55 of IC701 to ground via a 1000 resistorwhile switching on by the Main switch.
3. (EE3) Release the service switch after 3
seconds or (EE3W) remove the shortingresistor.
4. Switch off by the Main switch. The EEPROM
data values have now all been reset to theirinitial default values.
5. Switch on by the Main switch. (EE3) Press
the Service switch and then button 9 on theremote control within 5 seconds to enterservice mode (EE3W) press MENU then keyin 2-3-5-7.
6. Press the "*" button to select the OPTIONS
adjustment display.
7. Press buttons 2 or 8 to select the adjustment
8. Adjust the data value for each code as shown
in table 2.2A below using buttons 2 or 4:(other codes may be displayed but are notused) EE3 software:
EE3W software:
table 2.2A Data values for the OPTIONSadjustments.
9. Press the 0 button to write the changes to the
10.Press the * button to select the VCJ adjust-
ment display.
11.Press buttons 2 or 8 to select the adjustment
12.Adjust the data value of each code using
buttons 2 or 4 according to table 2.2B below:
EE3 software
EE3W software
table 2.2B Data values for the VCJ adjustments.
13.Press the "0," button to write the changes to
the EEPROM.
2.2.2 OPTION and VCJ code descriptions.VCJ
V-B-CORRECTION
C-CORRECTION-50
16x9-SW.RGB-MATRIX
V-SHIFT- 50
GREEN DRIVE
COLOUR SATURATION
PAL-LUMA-DELAY
SECAM-LUMA-DELAY
H-PHASE-TEXT
H-PHASE-SECAM
H-PHASE-RGB
P-AMP-16: 9
358 NTSC-LUMA-DELAY
443 NTSC-LUMA-DELAY
NTSC (358 & 443) CHROMA DELAY
BG CHROMA DELAY OFFSET
C-CORRECTION-60
TOP-BLANKING-50
BOTTOM-BLANKING-50
H-BLANKING-WIDTH-50
H-BLANKING-PHASE-50
TOP-BLANKING-60
BOTTOM-BLANKING-60
H-BLANKING-WIDTH-60
H-BLANKING-PHASE-60
SATELLITE ENABLE
AUDIO SYSTEM
AUTOTUNING SORT
RECEPTION STANDARD
COLOUR SYSTEM
NO. OF AV INPUTS
CHASSIS TYPE
SPEAKER SW ENABLED
EEPROM SIZE
AGC GAIN BG
AGC GAIN-DK
NICAM PRESCALE
TELETEXT TYPE
FAST/TOP TEXT
VOLUME PRESCALE
SCART PRESCALE
FM PRESCALE
WIDE SCREEN
2.3 VIF CIRCUITS
2.3.1RF AGC
VR101 (adjacent to the tuner)
1. Connect an RE signal such as an off-air
2. Check the AFT is on for the current channel.3. Adjust VR101 so that the picture and sound
exhibit no noise, beat or intermodulationdistortion.
2.3.2 SIF OFFSET
VR 102 (near IC101)
1. Connect an RE Crosshatch pattern signal
with NO sound modulation
2. Set the Volume control to about 3/4 of
3. Adjust VR102 to obtain minimum noise.
2.4 DEFLECTION CIRCUITS
2.4.1Important notes
Before making any adjustments, if you havechanged the CRT, FLYBACK TRANSFORMERor made any changes in the deflection circuits;adjust the CRT bias as described in 2.6.1 steps1 ~ 4.
Check the VERTICAL BREATHING CORREC-TION as follows:
1. Select the VCJ adjustment display.2. Set the adjustment code to 01 (1 VBC) with
buttons "2" or "8" on the remote control.
3. If necessary, adjust the data value to "-31"
using buttons "4' or "6' on the remote control.
2.4.2 Horizontal centre
Code: 09 (13 HP5) [H-PHASE-50]
1. Connect a VCR and play a PAL-Monoscope
alignment tape.
2. Select the VCJ adjustment display.3. Set the adjustment code to 09 (13 HP5) with
buttons "2" or "8" on the remote control.
4. Adjust the horizontal position with buttons "4'
or "6" on the remote control.
2.4.3 Horizontal width
Code: 06 (6 HW5) [H-AMP]
1. Connect a VCR and play a PAL-Monoscope
alignment tape.
2. Select the VCJ adjustment display.3. Set the adjustment code to 06 (6 HW5) with
buttons "2" or "8" on the remote control.
4. Adjust horizontal width with the buttons "4" or
"6" on the remote control.
2.4.4 East-West PCC
Code: 05 (5 CC5) [CORNER CORRECTION-50]Code: 03 (3 PT5) [PARABOLA TILT]Code: 02 (2 PA5) [PARABOLA AMP-50]
1. Connect an RF PAL Crosshatch signal.2. Select the VCJ adjustment display.3. Set the adjustment code to 05 (5 CC5) with
buttons "2" or "8" on the remote control.
4. Adjust the data value to "-25" with buttons "4"
or "6" on the remote control.
5. Set the adjustment code to 03 (3 PT5) with
buttons "2" or "8" on the remote control.
6. Watching the second vertical line in from both
sides of the screen (figure 2.4A), make anyupper and lower distortion symmetrical usingbuttons "4" or "6" on the remote control.
7. Set the adjustment code to 02 (2 PA5) with
buttons "2"or "8" on the remote control.
8. Adjust the straightness of both vertical lines
(figure 2.4B) using buttons "4" or "6" on theremote control.
9. Repeat steps 1 to 8 above if necessary.10.Connect a VCR and play a PAL-Monoscope
alignment tape.
11.Make sure the horizontal width and horizon-
tal centre are correct. If necessary readjustHorizontal Centre 09 (13 HP5) and HorizontalWidth 06 (6 HW5) again.
Load Dressing / Adjustments / Adjustments Cont'd / Safety Parts / Text PCB / CRT Diagram / Audio Amp Diagram / Dolby PCB Diagram
Main Diagram / Main Diagram Cont'd
MITSUBISHI CT 29BV1 BD