Optoma EP680, Руководство по обслуживанию

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Service Manual
3-6
3.3.1 Description
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A/D Converter
The TMC1203 converters analog signals to digital signal for panel use.
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D/A Converter
M62393 is a 8-channel 8 bit voltage output digital to analog converter,
and it includes data latch circuit and gain change circuit of output
amplifiers. It generates reference voltage to A/D converter & PLL
phase adjustment voltage.
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Resizing D/A
The gmz1 provides crisp graphics and professional quality video
Converter signal-clip image magnification solution.
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DC/DC Converter
The
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PC1100, are PWM type dual switch regulator control circuit
which incorporate 2.5V voltage reference, variable frequency
oscillator, two sets of synchronized switching control circuits,
timer latch short protection circuit and On/Off control circuit on a
signal monolithic chip. Circuit of the DC-DC converter uses 12V
and 5V DC-In to re5V, +5VA,-5V,+12V power sources,
+5V for digital logic circuit. +12V for inverter and +5V, -5V for
analog circuit.
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FIF0
The memory provide reset, jump, and line increment/hold pointer
control functions that can be used in synchronization with independent
clocks on each of the I/O ports. Memory can be accessed immediately
without any waiting period after the execution of these functions.
Provide input signal into buffer of LCD data. Through this buffer, the
Input speed to output speed does not have effect on transfer process.
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PLL
The ICS1522 provides the analog circuit blocks required for
implementing a video genlock dot (pixel) clock generator. It contains
a phase detector, charge pump, loop filter, and voltage-controlled
oscillator (VCO). By grouping these critical analog blocks into one IC
and utilizing external digital functions divider. Generate Dotclk for the
whole system, and also the reference signal of it is from Hsync.