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CTV2001 09 01 TELEVISION TECHNICAL BULLETIN
MODELS 37GT25H 37GT25IR Month of Issue: September 2001 Classification: White Page 1 of 1
51GT25H
REASON
NVM adjustment procedure
ACTION
When replacing the NVM it is essential that the data is correctly set for the model. If this is not carried out according to the information outlined below, the receiver will not be able to tune correctly and the teletext position will be poorly aligned. Model 37GT25H 37GT25IR 51GT25H Page 00 00 00 00 00 00 Location 0B 47 0B 47 0B 47 Value 72 0A F0 0A F8 1E Purpose TV options Teletext position TV options Teletext position TV options Teletext position
All of the above locations are in hexadecimal format. To set the values, it is necessary to press the number keys on the remote control to 'toggle' the various bits between `1' and `0'. Note the examples below: Hexadecimal code (displayed on screen) Binary code Remote key to 'toggle' A 1 7 9 1 3
0 6
1 5
0 4
0 2
0 1
1 0
If the above value (A9) has to be changed to 5F, keys 1,2,4 and 5 will have to be pressed. A9 Binary code 5F Binary code Remote key to 'toggle' 1 1 0 0 1 0 5 0 1 4 1 1 0 1 2 0 1 1 1 1
Note that keys 0,3,6 and 7 do not need to be pressed, as the bit has already been set correctly. Also ensure that the AFT is set to 40 and adjust the geometry and grey scale as required.
Sharp Electronics (UK) Limited
Reference AVW10092001-1 Revision 1
White Carry out as required Yellow Carry out as required and whenever the unit comes in for service Red Carry out on all units