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Service Manual CP-099/FS
5-4-4 Tuning
The AFC information is supplied by the demodulator IC, and becomes available on VCT pin 7 for controlling software.
The controlling software uses this information for tuner frequency tracking ( automatic following ). The AFC window
is typically between 50 KHz and 100 KHz.
The minimum frequency step of the tuner is 50 Khz.
This AFC function is disabled when a program is tuned using the direct frequency entry or after fine tuning adjustment.
Therefore it is recommended to tune channel with the TV search function ( manual or ATSS ) or using the direct
channel entry to enable the Automatic Frequency Control.
5-4-5 Over Curr ent Protection
In case of overload, the collector voltage of TR Q801 will be rise. The voltage on pin 7 of microcontroller rises over
r eference voltag e (about 1.5 V )The controlling software which continuously monitors this voltag e 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 hyster-
esis guarantees a reliable operation.
5-5 Teletext Display
National character option bits C12, C13, C14 are transmitted in the page header of a given teletext pag e. 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. However, for Cyrillic and Greek languages, a major character set change (a change of character
mapping) needs to effected for correct display
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, and therefore several possibilities for display.
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 language
mapping (either Latin or Greek/Cyrillic)
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, Latin font mapping is
selected. The consequence will be incorrect teletext display, with NO GREEK CHARACTERS DISPLAYED. Roma-
nian national font options will be selected.
Summary of Contents for DDT-21H9ZDF(21")
Page 17: ...16 Service Manual CP 099 FS...
Page 40: ...Service Manual CP 099 FS 39 5 Circuit desription 5 1 Block diagram CP 099...
Page 41: ...Service Manual CP 099 FS 40 5 Circuit desription Block diagram CP 099FS...
Page 66: ...65 CIRCUIT DIAGRAM VE2 0 DVD Player Series Block Diagram...
Page 67: ...66 CIRCUIT DIAGRAM DVD MODULE DQL 1000 ALIM3351 MPEG IC...
Page 68: ...67 CIRCUIT DIAGRAM DVD MODULE DQL 1000 RF MOTOR_DIRIVERS...
Page 69: ...68 CIRCUIT DIAGRAM DQL 1000 FLASH SDRAM...
Page 70: ...69 CIRCUIT DIAGRAM DQL 1000 AUDIO_DAC VIDEO_CHANNEL...
Page 71: ...70 CIRCUIT DIAGRAM DQL 1000 SYSTEM_POWER...
Page 75: ...74 CIRCUIT OPERATIONAL DESCRIPTION b TRACKING Block Diagram c MIRROR Block Diagram...
Page 107: ...Service Manual CP 099 FS 106 8 3 DDT 14H9ZZF...
Page 108: ...Service Manual CP 099 FS 107 9 PRINTED CIRCUIT BOARD 9 1 Main PCB CP 099FS...
Page 109: ...Service Manual CP 099 FS 108 9 2 Main PCB CP 099...
Page 110: ...Service Manual CP 099 FS 9 3 Power PCB CP 099 109...
Page 111: ...Service Manual CP 099 FS 9 4Power PCB CP 099FS 110...
Page 112: ...Service Manual CP 099 FS 111 10 SCHEMATIC DIAGRAM 10 1 Main CP 099...
Page 113: ...Service Manual CP 099 FS 112 Main CP 099FS...
Page 114: ...Service Manual CP 099 FS 113 10 2 Power CP 099FS...
Page 115: ...Service Manual CP 099 FS 114 Power CP 099...
Page 116: ......