Sharp Aquos LC-20E1M, Service Manual, Page: 14 / 72

14
LC-20E1H
LC-20E1M
[5] Adjustment
5-1. +B adjustment (R3760 Variable resistor)
1) Receive the colour bar signal.
2) Adjust the voltage at pin (2) of P3702 to 5.00 ± 0.02 V.
Note: The 5.0 V level is used as reference for all the line voltages. Make this adjustment as precisely as
possible.
5-2. Counter bias adjustment: COM BIAS on page 2
Adjust the "COM BIAS" setting until the contrast gets optimum (the black portion blackest). The adjustment
guideline is around 96.
5-3. TAMP adjustment
1) Feed the colour bar pattern signal.
2) See if the "Y" reading on adjustment process page 2 is within the range shown below. If not, adjust the "NTSC
TAMP" setting to bring the "Y" reading within the specified range.
3) If the "NTSC TAMP" setting has been readjusted, write down its new setting in the "PAL TAMP", "SECAM
TAMP", "PAL-M TAMP" and "PAL-N TAMP" items manually.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
2
C O M B I A S
6
N T S C T A M P 2 4
P A L T A M P 2 4
S E C A M T A M P 2 4
P A L - M T A M P 2 4
P A L - N T A M P 2 4
G C U T O F F
R C U T O F F
0
–
5
B C U T O F
T A M P H
F
G 3 B 3 R 3 0 0 0 0 0 0
+ 3
G 1 B 4 Y 0 0 0 0 C 6
C A
T A M P L B B
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Y Data
(White 75%)
9
(Page 2 of adjustment process OSD)
5-4. White balance adjustment
1) Feed the monoscope pattern signal.
2) Adjust the "RCUTOFF" and "BCUTOFF" settings on adjustment process page 2 to achieve the color at the same
level as with the standard set.
Note: Keep the "RCUTOFF" and "BCUTOFF" settings as an odd number, whenever possible, in the range below.
• • • -9, -7, • • • -1, +1, • • • +7, +9 • • •
If set to an even number, horizontal streaks may occur with a specific-gradation monochrome signal.
Model LC20E1H/M
Adjustment value BB~CA