Panasonic CT-34WX50 Service Manual ▷ View online
- 17 -
MEMORY
(IC5001)
DEF. YOKE
F.B.T.
A G
D G
Q
D D
FLESH TONE
HYBRID GAMMA
SPLIT SCREEN
SCREEN ADJ
DEF ADJ
SET UP
R-YANGE
R-Y AXIS GAIN
SUB TINT
SUB COLOR
REAL CONTRAST
REAL BRIGHT
R DRIVE
B DRIVE
G DRIVE
B DRIVE
G DRIVE
R CUT OFF
B CUT OFF
G CUT OFF
B CUT OFF
G CUT OFF
SUB CONTRAST
SUB BRIGHT
L RF AGC
R RF AGC
L COLOR VCO
R COLOR VCO
R SUB BRIGHT
H-POSITION
H-SIZE
V-POSITION
V-SIZE
BLANKING START
BLANKING END
OSD POS
OSD POS SPLIT
R-Y BLK LEVEL
B-Y BLK LEVEL
B-Y BLK LEVEL
DAF PHASE
MOIRE
H-PULSE DUTY
H-POSITION
H-SIZE
SIDE-PCC
H-PARALLEL
H-LINEARITY
V-POSITION
TRAPEZOID
TRAPEZOID
V-LINEARITY
V-SIZE
PCC
EW-CORNER TOP
EW-CORNER BOTTOM
V-S CORRECTION
X-RAY ADJ
CRT AGING
MODULE
MODULE
MODULE
MODULE
Service Adjustment Mode
Exchange parts and required adjustment
Exchange parts and required adjustment
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Adjustment method
Caution items for each adjustment method
[Switching of the color temperature]
... Switching of the color temperature between "WARM", "NORMAL", and "COOL" for
each adjustment is not done even when "COLOR TEMP" of "PICTURE ADJ" or
color temperature fine adjustment of "Technical" is selected. Accordingly, enter into
Concurrent mode, press the "AV ADJ" button of the remote control, and select with
the left and right cursor button to switch the color temperature.
color temperature fine adjustment of "Technical" is selected. Accordingly, enter into
Concurrent mode, press the "AV ADJ" button of the remote control, and select with
the left and right cursor button to switch the color temperature.
[At the time of 1080i adjustment]
*
Set to a condition where 1080i can be input. Then enter into Concurrent mode, confirm that the on-screen adjustment item is
1080i, and perform adjustment.
1080i, and perform adjustment.
[At the time of "DEF ADJ" adjustment]
... Refer to page 19.
White balance adjustment
Perform this white balance adjustment when the white or the black parts on the screen are out of balance or when the picture
tube has been exchanged. Before performing white balance adjustment, est the cut-off voltage must be set, and then perform
white balance adjustment.
tube has been exchanged. Before performing white balance adjustment, est the cut-off voltage must be set, and then perform
white balance adjustment.
1. Setting of the cut-off voltage
(1) Receive an NTSC signal and set the aspect ratio to "FULL.
(2) Enter into Concurrent mode and confirm that the color temperature is "WARM". (See above for setting of WARM/NORMAL/
(2) Enter into Concurrent mode and confirm that the color temperature is "WARM". (See above for setting of WARM/NORMAL/
COOL.)
(3) Select "HYBRID GAMMA" - "REAL BRIGHT" in Concurrent mode and fix the adjustment value to "AF". The select "HYBRID
GAMMA" - "G DRIVE" and fix the "G DRIVE" adjustment value to "AF".
*Setting to the above conditions facilitates the adjustment of the pedestal level (DC 170 ±5 V) in step (7).
*Setting to the above conditions facilitates the adjustment of the pedestal level (DC 170 ±5 V) in step (7).
(4) Turn the screen volume (S1) of the flyback transformer to the left, and set so that the OSD can just be seen.
(5) Enter into Concurrent mode and select "HYBRID GAMMA"
(5) Enter into Concurrent mode and select "HYBRID GAMMA"
- "G CUT OFF".
(6) Connect an oscilloscope to TPL2 (G cut-off) on the L-
Board. Then press the button "
" on the remote control to
obtain a green screen, and use the button "
" on the
remote control to obtain one horizontal line.
*Use TPL9 on the L-Board for probe earth. (There are also
TPL11, L7, L8, etc.)
*Use TPL9 on the L-Board for probe earth. (There are also
TPL11, L7, L8, etc.)
(7) When the above preparations have been made, use the
Volume "+, -" buttons on the remote control to adjust so that
the pedestal level of the voltage waveform becomes DC
170 ±5 V (refer to Fig. 1).
the pedestal level of the voltage waveform becomes DC
170 ±5 V (refer to Fig. 1).
(8) After completion of the adjustment, disconnect the oscillo-
scope, gradually increase the screen volume (S1) (clock-
wise turning), and fix it where green just starts to shine.
wise turning), and fix it where green just starts to shine.
After fixing, press the button "
" on the remote control and
cancel one horizontal line.
(9) To copy the adjusted G cut-off data with the same values to
the NTSC color temperatures "NORMAL" and "COOL" and to the 1080i color temperatures "WARM", "NORMAL" and
"COOL", enter "HYBRID GAMMA"-"G CUT OFF", and press the "NORMAL" button on the remote control for 3 seconds.
*When copying starts, the on-screen display flashes red, and the flashing stops when copying has been completed.
"COOL", enter "HYBRID GAMMA"-"G CUT OFF", and press the "NORMAL" button on the remote control for 3 seconds.
*When copying starts, the on-screen display flashes red, and the flashing stops when copying has been completed.
2. White balance adjustment
*
At the time of NTSC adjustment... Receive an NTSC signal and set the aspect ratio to "FULL". (-> Set "3D Y/C FILTER " to
"ON" only at the time of Receive of an NTSC signal.)
"ON" only at the time of Receive of an NTSC signal.)
*
Perform input paying attention to the reception method: NTSC/1080i.
(1) Select "HYBRID GAMMA" in Concurrent mode and confirm that the color temperature is "WARM".
(2) Look at the black parts of the presently input image and check for black floating or black unbalance.
(3) If there is black floating or black unbalance, select "HYBRID GAMMA" - "R CUT OFF", "B CUT OFF" and adjust with the "Vol-
(2) Look at the black parts of the presently input image and check for black floating or black unbalance.
(3) If there is black floating or black unbalance, select "HYBRID GAMMA" - "R CUT OFF", "B CUT OFF" and adjust with the "Vol-
ume-, Volume+" buttons on the remote control. (Low-light adjustment)
*Always have the adjustment values for R cut off and B CUT OFF ready.
*Always have the adjustment values for R cut off and B CUT OFF ready.
(4) Next, look at the white parts and check for white unbalance.
(5) If there is white unbalance, select "HYBRID GAMMA" - "R DRIVE", "B DRIVE" and adjust with the "Volume-, " buttons on the
(5) If there is white unbalance, select "HYBRID GAMMA" - "R DRIVE", "B DRIVE" and adjust with the "Volume-, " buttons on the
remote control. (High-light adjustment)
*Always have the adjustment values for R DRIVE and B DRIVE ready.
*Always have the adjustment values for R DRIVE and B DRIVE ready.
(6)After completion of the adjustment, check the received image, and if there is still unbalance, adjust again according to the
steps (3) to (6).
steps (3) to (6).
6
5
5
Fig.1 Cut-off voltage
DC170
±
5V
GND
G CUT-OFF
TPL2
- 19 -
Example 1: When trouble has occurred
for parts on the DG-Module
Exchange the parts on the DG-Module
Confirm
the image for each
screen mode and reception
method and check if there are manu
problems in regard to
image distortion
etc.
After
complection of offset,
confirm the image in each screen
mode and for each reception method,
and check for problems
like image distortion
etc.
In case of problems with NTSC
signal, perform adjustment in
NTSC "FULL" mode, and in case
of problems with 1080i, input a
1080i signal and perform
adjustment After completion of
each adjustment, perform offset.
signal, perform adjustment in
NTSC "FULL" mode, and in case
of problems with 1080i, input a
1080i signal and perform
adjustment After completion of
each adjustment, perform offset.
Perform adjustment for the
required locations.
required locations.
End
No
problems
problems
Perform adjustment
only where required.
only where required.
Not many
problems
problems
Many problems
Problems
Refer to page 22 for the
adjustment method for
1080i "FULL" mode.
adjustment method for
1080i "FULL" mode.
Refer to page 20 for the
NTSC/1080i offset range.
NTSC/1080i offset range.
•
•
Deflection Adjustment
1. Deflection correction
When DG-Module etc has been exchanged and the H/V-POSITION of the picture, the amplitude, etc. is to be corrected, select
“DEF ADJ” in Concurrent mode and adjust the deflection system. “DEF ADJ” has 13 items (sub-items of the Concurrent mode)
and adjustment of the image details is possible for each mode/aspect.
The contents of “8 adjustment methods for distortion correction” on pages 20 to 25 are mainly the adjustment contents required
for use of the offset function (using the built-in cross-hatch pattern). In addition, the adjustment methods using the monoscope
pattern for improvement of the adjustment accuracy also are shown.
“DEF ADJ” in Concurrent mode and adjust the deflection system. “DEF ADJ” has 13 items (sub-items of the Concurrent mode)
and adjustment of the image details is possible for each mode/aspect.
The contents of “8 adjustment methods for distortion correction” on pages 20 to 25 are mainly the adjustment contents required
for use of the offset function (using the built-in cross-hatch pattern). In addition, the adjustment methods using the monoscope
pattern for improvement of the adjustment accuracy also are shown.
2. Offset
(1) What is ofset?
A reference adjustment value (NTSC “FULL” mode and 1080i) is entered, and then the data are offset from the reference
value automatically by a single operation of the remote control to facilitate adjustment of this unit.
value automatically by a single operation of the remote control to facilitate adjustment of this unit.
Please refer to example 1 to check whether you should use offset or not.
*
Adjustment of the deflection system can be classified into 1. Offset application and 2. Adjustment of the required locations,
and the adjustment method should be selected after detailed investigation for each screen mode/reception method.
and the adjustment method should be selected after detailed investigation for each screen mode/reception method.
- 20 -
(2) Offset input method
Offset from NTSC Receive an NTSC signal and select “DEF ADJ”.
Offset from 1080i Receive a 1080i signal and select “DEF ADJ”.
After completion of adjustment in NTSC “FULL” mode or 1080i, press hte “NORMAL adjustment value to which adjustment
has been made at the time of NTSC FULL mode or 1080i respectively as the initial value, and then the data will be shifted
automatically from that value.
has been made at the time of NTSC FULL mode or 1080i respectively as the initial value, and then the data will be shifted
automatically from that value.
*
When offset is started, the on-screen display flashes red, and when this flashing stops, it indicates that offset has been com-
pleted.
pleted.
(3) Caution items for offset data
Offset data are an adjustment function effective only for “DEF ADJ”, and offset is applied independently for NTSC and 1080i.
Apply offset after adjustment for NTSC “FULL” mode and 1080i has been completed.
Offset data shift table
H-POSITION
H-SIZE
SIDE-PCC
H-PARALLEL
H-LINEARITY
V-POSITION
TORAPEZOID
V-LINEARITY
V-SIZE
PCC
EW-CORNER ••
•
TOP
EW-CONER
•
BOTTOM
V-S CORRECTION
NTSC
FULL
NTSC
NORMAL
NTSC
ZOOM
NTSC
JUST
480p
ZOOM
480p
FULL
1080i
+9h
-3h
-2Fh
-2Fh
+1h
-1h
+14h
-3h
+3h
-4h
-Ah
-5h
+3Fh
-4h
-Ah
-2h
-Ah
+2h
+2h
-1h
-1h
-1h
-5h
+1h
<1 PICTURE>
Note: Offset data is displayed by 16th digit.
H-POSITION
H-SIZE
SIDE-PCC
H-PARALLEL
H-LINEARITY
V-POSITION
TORAPEZOID
V-LINEARITY
V-SIZE
PCC
EW-CORNER ••
•
TOP
EW-CONER
•
BOTTOM
V-S CORRECTION
NORMAL
4 : 3
+4h
+4h
+9h
-6h
-1h
+2h
-4h
+1h
+2h
-6h
+2h
+20h
-12h
+1h
+1h
-4h
-4h
-7h
-9h
+2h
-1h
+1h
-4h
-1h
-4h
-6h
+2h
+2h
-2Dh
-11h
-1h
+7h
-14h
+1h
+1h
16 : 9
33.75kHz
16 : 9
31.5kHz
4 : 3
16 : 9
33.75kHz
16 : 9
31.5kHz
4 : 3
16 : 9
33.75kHz
16 : 9
31.5kHz
FULL
PoutP
<2 PICTURES>
* (NTSC "FULL" adjustment value) and (1080i adjustment value) must be adjusted.
* shift the NTSC "FULL" adjustment value. (NTSC offset range)
* shift the 1080i adjustment value. (1080i offset range)
* "x" can not be adjusted.
* shift the NTSC "FULL" adjustment value. (NTSC offset range)
* shift the 1080i adjustment value. (1080i offset range)
* "x" can not be adjusted.
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