56FW-53H. DA100 Repair Notes - Sharp TV Service Manual (repair manual). Page 70

DA100 (50Hz) Chassis – Article for Television Magazine 

All geometry adjustments are based on an internally generated test pattern as shown below. When 
carrying out any of the above geometry adjustments, use the internally generated test pattern for 
guidance. 
 

 

Follow the procedure below to set the G2 and Grey scale: 
1.  Tune the set to the output of a RF signal generator. 
2.  In the user menu, set the picture levels to the FACTORY settings. 
3.  In the user menu, set the tint control to its central position. 
4.  Enter the test mode. 
5.  Set the ABL levels in the NVM by adjusting positions 60, 61, 62, 63, 64 and 65 on page 00 to read 

80. Store each location by pressing the standby button on the remote control. 

6.  When the ABL levels have been set, adjust the G2 and grey scale (if necessary) as below. 

After setting the ABL levels as above, go to the Red Cut Off adjustment. The following data will 
appear on the screen. 

  
Using a cross hatch pattern set the G2 control on the line output transformer so that the display in 
the Red cut off box reads between 60 and 80 as indicated above. 
Important 
After setting the G2 control, it is necessary to re-set at least one of the RGB adjustments to force 
the software to re-set the correct ABL levels.  Just adjust one of the grey-scale gain or drives by one 
point.  There is no need to press the standby button to store this adjustment. 

Sharp Electronics (UK) Limited - March 2003