Panasonic PV-M1327 Service Manual page 51

WHITE BALANCE ADJUSTMENT
Purpose:
To set the standard white level for each color
temperature.
Symptom of Misadjustment :
White becomes bluish or reddish.
Adjustment : G DRIVE (EVR),
B DRIVE (EVR),
R CUT -OFF (EVR),
G CUT -OFF (EVR),
B CUT -OFF (EVR)
Specification: Refer to descriptions below.
Input : Video Input Jack
White Pattern Signal
Mode : STOP
Equipment : Oscilloscope, White Balance Meter
Method 1
1. Supply a White Pattern Signal to the Video Input Jack.
2. Press DISPLAY key (Service Switch) on the remote control
for collapse scan.
3. Turn the SCREEN CONTROL on Flyback Transformer
fully counterclockwise.
4. Turn the SCREEN CONTROL on the Flyback Transformer
clockwise carefully and stop at the point where any color is
first observed.
5. Select B CUT -OFF, G CUT -OFF or R CUT -OFF in EVR
adjustment mode and adjust colors which are not observed
in step 4 so that the horizontal line is white.
7. Press DISPLAY key on the remote control again to return
for full frame scan.
8. Place the photo sensor foot for "JUST FIT" to the CRT.
9. Select SUB BRIGHT in EVR adjustment mode and adjust
so that the White Balance Meter (High-Light White, G
Meter) is 80 micro A (Model: A, B, C, D, E) or 40 micro A
(Model: F, G, H, I).
10. Select G DRIVE and B DRIVE in EVR adjustment mode
and adjust so that the White Balance Meter (both G and B
Meters) is 0 micro A.
11. Select SUB BRIGHT in EVR adjustment mode and adjust
so that the White Balance Meter (CUT-OFF White, R
Meter) is 50 micro A.
12. Select G CUT -OFF and B CUT -OFF in EVR adjustment
mode and adjust so that the White Balance Meter (both G
and B Meter) is 0 micro A.
13. Repeat the step 9 and 10 until both G and B read 0 micro
A in the High-Light and Low-Light Modes.
Note:
Before pressing DISPLAY key on the remote control for
collapse scan, select the desired control function and move
the shaded area to the value.
Method 2 (Alternative to Method 1)
1. Supply a White Pattern Signal to the Video Input Jack.
2. Select G DRIVE and B DRIVE in EVR adjustment mode
and adjust so that the entire screen is white.
3. Select SUB BRIGHT in EVR adjustment mode. Then, after
making a note of the original value, adjust to the minimum
(C0).
4. Select B CUT -OFF, G CUT -OFF or R CUT -OFF in EVR
adjustment mode and adjust colors which are not observed
so that the entire screen is white.
5. Select SUB BRIGHT in EVR adjustment mode and set it
and confirm that the screen is tracking the White Pattern
properly.
Repeat the above steps 2 to 4 until the screen is properly
tracking the White Pattern.
SUB BRIGHTNESS ADJUSTMENT
Purpose :
To set the optimum brightness level.
Symptom of Misadjustment :
The picture is too white or too black.
Note:
Perform this adjustment in a darkened room.
Adjustment : SUB BRIGHT (EVR)
Specification: Refer to descriptions below.
Mode : STOP
1. Reset the control levels to the factory-set levels using the
remote control. (Refer to Step 1 in the SUB CONTRAST
ADJUSTMENT.)
2. Do not input any signal to the unit.
3. Set INPUT SELECT item to LINE in SET UP TV menu to
display black screen.
4. Select SUB BRIGHT in EVR adjustment mode, and adjust
so that the black screen starts to turn grey (lighting only).
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