Sharp 21LF-90N, Service Manual

Page: 35 / 56

23
AK - 44
CHASSIS
14. SERVICE MENU
14.1 Service Menu entrance
All system, geometry and white balance alignments are performed in Service Mode. Before starting the service
mode alignments, make sure that all manual adjustments are done correctly.
To enter the service mode:
1. Press the MENU (30) button on the remote control gun. See figure 5.
2. Press digit keys 4, 7, 2 and 5 consecutively.
When the Service Mode is entered the following On Screen Display appears (figure 4):
Figure 4. Service Mode Figure 5. Remote Control
To adjust the different registers:
1. Use the CURSOR UP (2) / DOWN (31) buttons to move between the registers. See the above right figure.
2. Use the CURSOR LEFT (32) / RIGHT (3) buttons to change the data. See figure 5.
To memorize the adjustment:
It is not required to memorize the adjustment. Data are stored automatically.
To exit the Service Mode:
Switch the TV off using the mains switch.
14.2 Service Adjustments
Default Values
Register Parameter Notes
A51EFS13X191 A51ELD032X001
OSD
OSD Horizontal Position 70 81
IF1
IF Coarse Adjust X X
IF2 IF Fine Adjust X X
IF3
IF Coarse Adjust for L-Prime X X
IF4 IF Fine Adjust for L-Prime X X
AGC Automatic Gain Control X X
VLIN
Vertical Linearity 37 10
RGBH RGB Horizontal Shift Offset CVBS – RGB Horizontal
position compensation
8 7
VSOF
Vertical Size Offset for 60 Hz -30 -32
VPOF
Vertical Position Offset for 60 Hz 2 1
HSOF Horizontal Size Offset for 60 Hz -22 -22
HPOF Horizontal Position Offset for 60 Hz -18 -18
HTOF Horizontal Trap Correction Offset for 60 Hz -19 -20
WR
White Point Adjust for RED 49 42
WG White Point Adjust for GREEN 45 41
WB White Point Adjust for BLUE 42 42
BR
Bias for RED 31 31
BG Bias for GREEN 31 31