VESTEL DVD7200, Service Manual

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LED red in stand-by mode and green when the device is on. When entering
stand-by mode, pin 48 goes HIGH (+5V) and controls the transistor Q2 on the
power board.
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Vacuum fluorescent display is specially designed for DVD.
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The scanned keys are transmitted via PTC 16311 pin 5 and 6 to the
mainboard.
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IR remote control receiver module (TSOP1836) sends the commands from
the remote control directly to mainboard.
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Socket PL3 carries the VFD filament voltage and –22 Volts.
11.3 BACK PANEL:
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There are 1 SCART connector , 2 or 6 pieces RCA audio jacks, for audio
output, 1 coaxial digital audio output and 1 laser digital audio output on the
back panel.
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TOTX176 is used for laser output.
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For coaxial audio output SPDIF is used.
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Q18 .. Q26 transistors are to mute the audio outputs while switching the state
of the unit(power on/off)
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There are two op-amps in U9, U11 and U13. They are used for left,right,rear
left and right, subwoofer center audio channels. The feedback resistor is
amplifying the gain.
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SCART pin 8 controls 16:9 and 4:3 mode using Q12,Q14 and Q15.
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When the pin8 output of the scart becomes 5 Volts, 4:3 mode is selected and
16:9 mode is selected when this output becomes 0. The circuit is adjusted to
output 12 Volts for 4:3 mode and 6 Volts for 16:9 mode.
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Transistors Q12,Q14 and Q15 transmit these voltages when the device is
turned on and cuts them off when it is turned off.
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FBL on pin 16 transmits 5 Volts via transistors Q10 and Q9 when the device
is on.