Service manual

ViewSonic Corporation Confidential - Do Not Copy VA903b-1_ VA903m-1
6
GENERAL specification
Test Resolution & Frequency 1280 x 1024 @ 60Hz
Test Image Size Full Size
Contrast and Brightness Controls
Factory Default:
Contrast = 70%, Brightness = 100%
VIDEO INTERFACE
Analog Input Connector DB-15 (Analog), refer the appendix A
Default Input Connector Defaults to the first detected input
Video Cable Strain Relief
Equal to twice the weight of the monitor for five
minutes
Video Cable Connector DB-15 Pin out Compliant DDC 2B
Video Signals Video RGB (Analog), Separate
Video Impedance 75 Ohms (Analog)
Maximum PC Video Signal 950 mV with no damage to monitor
Maximum Mac Video Signal 1250 mV with no damage to monitor
Sync Signals TTL
DDC 2B Compliant with Revision 1.3
Sync Compatibility Separate Sync
Video Compatibility
Shall be compatible with all PC type computers,
Macintosh computers, and after market video cards
Resolution Compatibility
640 x 350, 640 x 480, 720 x 400 (640 x 400), 800 x
600, 832 x 624, 1024 x 768, 1152 x 864, 1280 x 1024
Exclusions Not compatible with interlaced video
POWER SUPPLY
Internal Power Supply Part Number: PI-SB03/
Input Voltage Range
100 - 240VA C
Input Frequency Range
50/ 60 Hertz
Short Circuit Protection
OUTPUT CAN BE SHORTED WITHOUT DAMAGE
Over Current Protection
6.0 A TYPICAL AT 5.0 VDC
Leakage Current
1.0 MA (MAX) AT 264 VAC / 60HZ
Efficiency
80 % TYPICAL AT 115 VAC FULL LOAD
Fuse
INTERNAL AND NOT USER REPLACEABLE
Power Dissipation
32 WATTS (TYP)
Max Input AC Current
1.2 ARMS @ 90VAC, 0.8 ARMS @180VAC
Inrush Current (Cold Start)
30 A @ 90VAC, 60 A(MAX) @ 264 VA C
Power Supply Cold Start
SHALL START AND FUNCTION PROPERLY WHEN
UNDER FULL LOAD, WITH ALL COMBINATIONS OF
INPUT VOLTAGE, INPUT FREQUENCY, AND
OPERATING TEMPERATURE