Read Panasonic CT-34WX50 Service Manual online
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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
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