Sony VPL-PX20 Service Manual page 4

3-6. Description of QA Board Operations ........................................................ 3-10
3-7. Description of QB Board Circuit Operations ............................................ 3-12
3-8. Description of QC Board Circuit Operations ............................................ 3-13
3-9. Description of QD Board Circuit Operations ............................................ 3-14
3-10. Description of K Board Circuit Operations .............................................. 3-14
3-11. Description of KS Board Circuit Operations ............................................ 3-14
3-12. Voltage Map of F, GA, GB, GC, GD Board ............................................. 3-15
4. Electrical Adjustments
4-1. Equipment Required .................................................................................... 4-1
4-2. Preparations ................................................................................................. 4-1
4-3. C Board Adjustments .................................................................................. 4-1
4-4. Signal Level Adjustments ........................................................................... 4-1
2
3-5-1. Microprocessor peripheral circuit .............................................. 3-6
3-5-2. USB Circuit ................................................................................ 3-7
3-5-3. Memory ...................................................................................... 3-8
3-6-1. Switching of Video Signals ...................................................... 3-10
3-6-2. Switching of Audio Signals ..................................................... 3-11
3-6-3. Monitoring of the USB Power Supply ..................................... 3-11
3-7-1. INPUT A Input ......................................................................... 3-12
3-7-2. DDC Memory ........................................................................... 3-12
3-7-3. INPUT A Mouse Driver ........................................................... 3-12
3-8-1. INPUT B Inputs ....................................................................... 3-13
3-8-2. DDC Memory ........................................................................... 3-13
3-8-3. INPUT A Mouse Driver ........................................................... 3-13
3-9-1. RS-232C Communication ........................................................ 3-14
3-9-2. Reception of Remote Control Signals ...................................... 3-14
3-9-3. Video Input ............................................................................... 3-14
3-12-1. Voltages Map of F, GA, GB, GC and GD Board .................... 3-15
3-12-2. F Board ..................................................................................... 3-15
3-12-3. GA Board ................................................................................. 3-16
3-12-4. Main Converter ........................................................................ 3-19
3-12-5. Basic Operations of Sub-Converter ......................................... 3-20
3-12-6. Details of Parts ......................................................................... 3-21
3-12-7. GB, GC, and GD Boards .......................................................... 3-22
4-2-1. Turning on the Power ................................................................. 4-1
4-2-2. Setting the Factory Mode ........................................................... 4-1
4-3-1. R VCOM Adjustments ............................................................... 4-1
4-3-2. G VCOM Adjustments ............................................................... 4-1
4-3-3. B VCOM Adjustments ............................................................... 4-1
4-4-1. Component Level Adjustments .................................................. 4-1
4-4-2. VIDEO NTSC Level Adjustments ............................................. 4-2
4-4-3. VIDEO PAL Level Adjustments ............................................... 4-2
4-4-4. Y/PB/PR Level Adjustments ...................................................... 4-2
VPL-PX20/PX30