Hisense LTDN50K3801UWTRU Service Manual page 18

3.2.1 Signal prefabricate
3.2.3 Factory Option
Item Default Options Notes
M-Can enter factory mode with factory
RC or user RC.
1 MODE M M, U
U-Can enter factory mode only with
user's RC.
Note: MODE "M" is only used for factory production.
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