ViewSonic VG910S Service Manual - Page 23

5. Adjusting Procedure 5.1 General. 1. All specification must be met over line voltage range of 90VAC to 264VAC 50Hz / 60Hz, unless otherwise specified. 2. Operating temperature range is 0oC to 40oC with a relative humidity of 10% or less to 80%. 3. The monitor must be operational in a usable state within 30 minutes after turn-on. 4. All signal levels are measured assuming termination at the monitor's input jacks or in its characteristic impedance. 5. All controls must have excess range (no control may be left at an end stop when proper alignment is completed). 6. The monitor is not required to meet specs during the following but must tolerate, without damage to the LCD or circuits, any sequence or combination of power on and off, signal on and off, erratic, wrong frequency or noisy inputs while at any possible unplugging of power or signal, settings of user accessible controls likewise, the monitor should survive extended periods of operation with line voltage reduced below the specified minimum. 7. An isolation transformer should be used when performing alignment and tests, Portions of the power supply board are hot ground, The remaining boards are cold ground. 8. Ambient condition: 8.1 Illumination: In usual inspection of electric performance and mechanical performance, it shall be 150 ~ 260lux. 8.2 Environmental noise: Less than 60dB. 8.3 Interference of EMI: The inspection shall be carried out in the place where a set is not disturbed by external unnecessary electric wave and magnetic field. 8.4 Temperature: 24 ± 2oC. 8.5 Humidity: 65 ± 20%. ViewSonic Corporation Confidential - Do Not Copy VG910s/b 20