Daewoo DSD-9251MA, Service Manual

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CIRCUIT OPERATING MANUAL
1-4) Video Output
There are 2 Video Output Port in the DSD-9251MA products. (TV Scart,RCA JACK)
The output of R,G and B signals are sent to TV Scart through Video Buffer and LPF (Low Pass Filter) originated from
the STI5518 output.
Y and C signals output is sent to S-VHS JACK through Video Buffer and LPF from the Sti5518 output.
CVBS signal output takes place in VCR SCART through the Video Buffer and LPF from the STI5518 output.
Moreover, the CVBS signals from the STI5518 output is sent to the INPUT of A/V SWITCH(MM1232) for the
Switching (SAT MODE/VCR MODE SELECT) with CVBS signals that were entered from the VCR SCART. A/V
SWITCH (MM1232) selects Output depends on the Logic status of Pin (2,7 and 12). Selected signals in the A/V
SWITCH system is sent to individual output mode of TV SCART, RF_MODULATOR and RCA JACK through the
Video Buffer and LPF.
There are two control signals as of Fast Blanking and Slow Blanking in TV SCART.
Chart 9 shows the usage of control signals.
Current TV/VCR Scart Pin that are used in the DSD-9251MA is as following.
Chart 9. Slow/Fast Blanking Function
Chart 70. TV/VCR SCART Connector Pin
(SCART CONNENTOR)
Following Table shows the Scart Connector
- Can select either TV/AV mode or 16:9/4:3 mode.
Slow Blanking TV/AV Selecting TV/AV mode of TV SET.
(Pin8) TV mode : <1.5V, AV mode : 10 ~ 12V
16:9/4:3 Selectint Wide Mode.
4:3 mode = 10 ~ 12V, 16:9 mode= 5 ~ 6.5V
Select video input signal of TV.
Fast Blanking RGB : 1~ 3V
CVBS : 0 ~ 0.4V
FUNCTION PIN NO.
AUDIO_OUT_R 1
AUDIO_OUT_L 3
VIDEO_OUT 19
SLOW_SWITCH 8
FAST_BLANKING 16
R 15
G 11
B 7
VIDEO_GND 5,9,13,14,17,18,21
AUDIO_GND 4
FUNCTION PIN NO.
AUDIO_OUT_R 1
AUDIO_IN_R 2
AUDIO_OUT_L 3
AUDIO_IN_L 6
SLOW_SWITCH 8
VIDEO_OUT 19
VIDEO_IN 20
VIDEO_GND 5,9,13,14,16,17,18,21
AUDIO_GND 4
20 2
19 1
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