Over Current Protection; Teletext Display - Daewoo DTF-2950-100D Service Manual

CP-850FX Service Manual

5.5.8 OVER CURRENT PROTECTION

In case of overload, the SMPS secondary voltages will drop. The voltage on pin 5 of
microcontroller changes Low to High. The controlling software which continuously monitors this
voltage will switch the set to stand by mode. To power on the set again the user must switch it off
using the main power switch. Appropriate hysteresis guaranty a reliable operation.

5.6 TELETEXT DISPLAY

National character option bits C12, C13, C14 are transmitted in the page header of a given
teletext page. The national option bits are intended to change (or exchange) 13 characters within
the G0 character set, according to the needs of each national language.
These codes represent, for a given broadcaster, the intended language that the teletext page
should be displayed in. As there are only 3 bits, there are only 8 codes available to cover all the
possible language combinations. This means that for a received code there are several
possibilities meanings, according to the local code of practice.
This is not as bad as it first seems, as we use the user-selected OSD language to identify the
intention of the broadcaster. For example, a user wishing to see Russian teletext should select
Russian OSD language, otherwise he would not have correct teletext display on the TV.
The table below allows the reader to understand the relationship between selected OSD
language (which is under user control), the teletext language display (selected by national option
bits in transmission page header) and the Packet 26 language selection (selected within packet
26 of the transmission page).
An example: For Greek teletext display, (if national option code 1 1 1 is received from the
broadcaster), the user should select the Greek OSD language. Even if English, French, German,
Italian, Spanish, Dutch, Danish, Finnish, Norwegian or Swedish OSD languages are selected,
the teletext will be correctly displayed.
However, if Polish, Hungarian, Czech, Slovakian, Rumanian or Russian OSD are selected, the
consequence will be incorrect teletext display for the national option characters. Romanian
national font options will be selected.
Europe R&D 60
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