Circuit Descriptions and Abbreviation List
EN 30 FHP PDP9.
9. Circuit Descriptions and Abbreviation List
9.1 Board Function Description
9.1.1 Logic Board Function
Data Processor
• Gamma adjustment (1 / 2.2 / 2.4 / 2.6 / 2.8).
• NTSC/EBU format (Colour matrix) Switch.
• RGB gain Control (White balance adjustment, amplitude
limitation).
• Error diffusion technology (grey scale adjustment).
• Dither (grey scale adjustment).
• Burn-in pattern generation.
Data Converter
• Quasi out-line adjustment (luminous pattern control).
Scan Controller
• Address driver control signal generator (ADM).
• Scan driver control signal generator (SDM).
• X/Y sustain control signal generator.
Waveform ROM
• Waveform pattern for drive / timing memory.
MPU
• Synchronous detection.
• System control.
• Driving voltage (Va, Vs, Vr, Vw) adjustment.
• Abnormal watch (breakdown detection) / abnormal
processing.
• I_s (sustain) current control (sustain pulse control).
• I_a (address) current control (sub-field control).
• External communication control.
• Flash memory (firmware).
EEPROM
• Control parameter memory.
• Counts operating time (number of hours).
• Abnormal status memory (16 places).
9.1.2 Function of X-SUS Board
DC/DC power supply block
• Vcc (+5V) -> Ve (+17V) / XFve (+18V, floating).
X Switching Block
• Switching during address period.
• Switching during sustain period.
• Switching during reset period.
Current Detector Block
• I_sx (sustain) current detection.
• I_ax (address) current detection.
9.1.3 Function of Y-SUS Board
DC/DC Power Supply Block
• Vcc (+5V) -> Ve (+17V) / YFve (+ 18V, floating)
• Vs (+85V) -> Vw (+185V)
Switching Block
• Switching during address period.
• Switching during sustain period.
• Switching during reset period.
Current Detector Block
• I_sy (sustain) current detection.
• I_sp (SDM) current detection.
9.1.4 Function of ADM Board
Address Driver Module
• Supplies voltage Va to the glass plate.
9.1.5 Function of SDM Board
Scan Driver Module
• Supplies voltage Vs to the glass plate.
9.1.6 Function of PSU Board
Stand-by Power Supply Block
• AC100-240: +5V & +3V3 Stand-by.
PFC Block (AD/DC Power Supply Block)
• AC100-240: +390V.
AD/DC Power Supply Block
• +380V, Vcc (+5V), Vs (+80V), Va (+60V).
Current Detection Block
• l_a (address) current detection.
Abnormal Voltage Monitoring
• Vs excess voltage monitoring.
• Va excess voltage monitoring.