Sharp LC-15L1US, Service Manual, Page: 17 / 150

17
LC-15L1U-S
5. Adjustment
5-1. +B adjustment (monitor and wireless center)
1) Receive the standard color bar signal.
2) Adjust the +B-ADJ setting on page 2 of the monitor adjustment process to have the TP1101 voltage at
5.00±0.02 V.
3) Turn the wireless center's R5707 (semi-fixed variable resistor) to have the TL5403 voltage at 5.00±0.02 V.
Note: The 5.00 V reference is for all the supply voltages. Make the 5.00 V adjustment as accurately as possible.
5-2. Common bias adjustment..........Page 2 of the adjustment process
1) Adjust the "COM BIAS" setting on adjustment process page 2 so that the contrast goes to maximum (black most
accentuated). (For this adjustment, receive a B/W broadcast channel.)
5-3. White balance (cut-off and gain) adjustment
Vary the "RCUTOFF", "BCUTOFF", "RGAIN" and "BGAIN" settings on page 3 of the adjustment process.
1) Receive the black signal (white 40%).
Adjust the "RCUTOFF" and "BCUTOFF" settings on adjustment process page 3 to have the black color
temperature as specified.
2) Receive the white 80% signal.
Adjust two of the "R-GAIN", "G-GAIN" and "B-GAIN" settings in the decreasing direction to have the white
color temperature as specified.
Note:Make sure at least one of the "R-GAIN", "G-GAIN" and "B-GAIN" settings is "0".
3) Check to see if the black and white color temperatures are as specified. If not, repeat the above steps 1) and
2).
Adjustment Process Page 3
RCUTOFF 0
GCUTOFF 0
BCUTOFF 0
R-GAIN 0
G-GAIN 0
B-GAIN 0
Red cut - off adjustment
Green cut - off adjustment
Blue cut - off adjustment
White balance
White balance
White balance