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VL-RDl U
TL801 (R OUT)
TL802 (G OUT)
TL803 (B OUT)
TL804 (C OUT)
2. DAC full-scale adjustment
Test point
Address
Mode
VCR AV input
Procedure
VCR ADJ 3D (R)
VCR ADJ 3E (G)
VCR ADJ 3F (B)
VCR ADJ 29 (C)
1) Change the VCR ADJ addresses 46,57 and 69 to 7F, FE and 7F, respectively.
2) With the VCR ADJ address 3D, set the TL801 output voltage to the adjustment rating, and with the
oscilloscope,
set the peak voltage also to the adjustment rating, in such a way that the both TP's
voltages will be averaged into the rated mean value.
3) With the VCR ADJ address 3E/3F/29, set the TL802/803/804
output voltage to the adjustment rating,
and with the oscilloscope,
set the peak voltage also to the adjustment rating. ((Same as in Step 2)
above)
4) Set the changed address data back to normal.
Note: Setting each address data back to normal leaves the LCD screen white. At this time, turning off and
on the main power will restore the screen (the lithium battery should be removed).
1 .OOOVp-p + IOmV
1 .OOOV f 1 OmV
Adjustment
rating
tr-_1H +
l
During IC703(E2PROM) replacement.
l
During IC801 replacement.
Examples
3.
COM-Bias adiustment
Test point
Address
Mode
LCD panel display area
VCR ADJ 33
VCR AV input
40% White (or gray scale) signal
Input signal
Procedure
1)
2)
3)
Input white 40% signal as AV input.
Set the illuminometer
(TOPCON IM-3) on the LCD panel surface.
(Shut off the external light.)
Minimize the ripple of output waveform of illuminometer.
-
Response time : 0.6 sec.
Adjustment
rating
Remark
Examples
Minimum
Set the point to make the black portion blackest.
Make this adjustment after 5minute
or longer aging.
l
During IC703(E2PROM) replacement.
l
During circuit board (Main) replacement.
l
During LCD replacement.
LCD panel display area
I
4.
White Balance adjustment
Test point
Address
Mode
Procedure
VCR ADJ 30 (R)
VCR ADJ 31 (B)
I
VCR AV input
1) Feed 40% white signal to the AV input jacks and the standard monitor.
2) Set the Color luminance meter (TOPCON BM-5) on the LCD panel surface.
(Shut off the external light.)
3) Adjust the VCR ADJ addresses 30 and 31 until it became the same as that of the standard monitor.
Set of the standard
W=VF-HL3-136
Set of the limit
R=VF-HLI -048
G=VF-HLI -050
B=VF-HLI -052
Adjustment
rating
Remark
Examples
Make this adjustment after 5-minute or longer aging.
l
During IC703(E2PROM) replacement.
l
During circuit board (Main) replacement.
l
During LCD replacement.
10-12
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