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9. V COM Adjustment (PD-71 board)
Set the DC bias of the common electrode drive signal of the LCD
panel to the specified value.
If deviated, the LCD display will move, producing flicker and
conspicuous vertical lines.
Mode
VTR playback
Audio operation check,
Signal
Color bar portion
Measurement Point
Check on LCD display
Measuring Instrument
Adjustment Page
D
Adjustment Address
CF
Adjusting method:
1) Set data: 01 to page: 1, address: 00.
2) Set the data of page: D, address: CF to the initial value (48).
3) Change the data of page: D, address: CF and observe the LCD
display. When the data is increased from the initial value, vertical
lines with intervals of 3 dots between them will be seen. Take the
data at this time as D
. When decreased from the initial value,
A
the same vertical lines will be seen and this data named D
4) Convert D
and D
to decimal numbers to obtain D
A
B
(Refer to Table 6-4-2. "Hexadecimal-Decimal Conversion table"
of "Service mode".)
5) Calculate D
´ using the following equation (decimal calculation)
C
´) ÷ 2
D
´ = (D
´ + D
C
A
B
6) Convert D
´ to a hexadecimal number to obtain D
C
7) Set data: D
to page: D, address: CF and press the PAUSE button
C
of the adjusting remote commander.
8) Set data: 00 to page: 1, address: 00.
Fig. 6-1-21.
´ and D
A
.
C
Enlargement
3 dots between
10. White Balance Adjustment (PD-71 board)
Adjust to the proper white balance.
If it is not correct. the color reproducibility of the LCD panel will be
poor.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
1) Set data: 01 to page: 1, address: 00.
2) Set data: 02 to page: 2, address: 49.
3) Set the data of page: D, address: C9 and CA to the initial value.
Address
Data
Note: Press the PAUSE button of the adjusting remote
.
B
commander each time to set the data.
´.
B
4) Check that the LCD display is not colored. If it is, change the data
of address: C9 and address: CA, and adjust so that the display is
not colored.
Note: To write in the non-volatile memory (EEPROM), press
the PAUSE button of the adjusting remote commander
each time to set the data.
5) Set data: 00 to page: 2, address: 49.
6) Set data: 00 to page: 1, address: 00.
6-28
VTR playback
Optional recorded tape
Check on the LCD display
D
C9, CA
The display should not be colored
C9
CA
80
80
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