Service Adjustment - Sharp 27L-S500 Service Manual

Ë SERVICE ADJUSTMENT
Entering The Fixed Values
1. Before starting all the adjustments, enter the fixed
values listed in Table - A.
Screen Adjustment
1. Feed the B/W pattern signal from the signal
generator.
2. Set the S21 bus data to "01" to get the Y signal mute.
3. Adjust the S16(R), S17(G) and S18(B) settings to
Step "64".
4. Fix the S12 setting to the data 45.
5. Adjust the SCREEN control until the raster becomes
as dim as possible and just visible.
6. Select a luminance-short gun, and adjust the bus
data of S16(R), S17(G) or S18(B) to have the
luminance at the white level.
7. Adjust the SCREEN control again to cut off the CRT.
8. Set the S21 bus data to "00" to deactivate the Y signal
mute.
White Balance Adjustment
White balance adjustment of composite signal input
1. Feed the B/W pattern signal via the video input
terminal from the signal generator.
2. Adjust the "S19" and "S20" settings to obtain the
specified white level.
White balance adjustment of component signal input
(Only for Models 27L-X2000, CL27X200)
1. Feed the B/W pattern signal via the component signal
input Y terminal from the signal generator.
2. Set the S21 bus data to "01" to get the Y signal mute.
3. Adjust the C08(R), C09(G) and C10(B) settings to
step "64".
4. Select a luminance-short gun, and adjust the bus
data of C08(R), C09(G) or C10(B) to have the
luminance at the white level.
5. Adjust the "C11" and "12" settings to obtain the
specified white level.
Sub-Picture Adjustment
1. Receive a good local channel.
2. Make sure the customer picture control is set to
maximum.
3. Enter the service mode and select the service
adjustment "S09".
4. Adjust the data value to achieve normal contrast
range.
Sub-Tint Adjustment
1. Receive a good local channel.
2. Set customer tint control to center of it's range.
3. Enter the service mode and select the service
adjustment "S10".
4. Adjust "S10" data value to obtain normal flesh tones.
5. Reduce the S10 data value by 5 steps. Take the
resulting S10 setting as the S42 data.
Sub-Color Adjustment
1. Receive a good local channel.
2. Make sure the customer color control is set to center
position .
3. Enter the service mode and select service adjustment
"S11".
4. Adjust "S11" data value to obtain normal color level.
13
27L-S500,27L-X2000
CL27S50,CL27X200