Description Of Qc Board Circuit Operations; Input B Inputs; Ddc Memory; Input A Mouse Driver - Sony VPL-PX32 Service Manual

3-8. Description of QC Board Circuit Operations

The QC board is composed of the INPUT B input terminal, DCC memory, INPUT B mouse driver, and
monitor-out terminal.

3-8-1. INPUT B Inputs

Unlike INPUT A , only analog signals of DSUB15 pin are accepted. The signal is input from CN1802,
and output from CN1804 to the QA board.

3-8-2. DDC Memory

IC1802 is the DDC memory of INPUT B. This IC is written with EDID data for DDC.
When a computer is connected to CN1802, power is supplied to the IC. If the computer connected is
DDC compatible, DDC communication will be performed.

3-8-3. INPUT A Mouse Driver

IC1201 is the mouse driver for INPUT A. The operations are basically the same as INPUT A. The only
difference is that INPUT B has no USB connection.
The mouse code input from CN1804 "A1 and B2" is decoded by IC1801, and output from CN1801 to the
computer.
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VPL-PX32