Functional Specifications; Display Quality; Display Date Area (With 20 Ft-L At Full White Pattern); Video Amp Performance - Acer 7277e Service Manual

1.4 Functional Specifications

All the tests to verify specifications in this section must be performed under the following standard conditions
unless otherwise noted. The standard conditions are:
-Temperature : 25 +-5 degree Celsius
-Magnetic field : No additional magnetic field in near side, CRT faces to East.
-AC line input voltage : 110Vac
-Warm-up time : 30 minutes minimum
-Checking display mode : All the presenting modes, as 3.1.4 shown.

1.4.1 Display Quality

1.4.1.1 Display Date Area (with 20 ft-l at full white pattern)

(1) Horizontal 310 4mm
(2) Vertical

1.4.1.2 Video AMP Performance

(1) Video bandwidth : 110MHZ
(2) Resolution : 1280 X 1024 max(center)
(3) Effective rise/fall time : 6.5ns typical
(4) Ringing : 10% max, first overshoot
(5) Sag : 5% max (at horizontal freq.)
Measurement Condition:
Signal Input Source: Chrome Signal generator
Input Timing / pattern : Fh=64KHz
Cross-hatch pattern measure method: Input Cross-hatch pattern signal, then set External
contrast Adjustment max. and Brightness 30 and measure the output signal from each cathode
of detached CRT socket at the equivalent cathode capacitance when probe is attached. From
measuring the high frequency part of Input signal, we get the video AMP performance parameter
defined above.

1.4.1.3 Light Output

(1) At 3" block pattern (ABL is non-working) : 35Ft-L min (C1 ~ C5).
(2) At full-white pattern (ABL is working) : 28Ft-L min.
All the above is based on the conditions that Raster cut-off and contrast control is set to
maximum.

1.4.1.4 Contrast Adjustment Range

over 15dB

1.4.1.5 Brightness Adjustment Range

At contrast control set at maximum level, adjusting Brightness control from
maximum position, the light output of 3" block pattern shall be increased more than 15 minimum .
If adjusting Brightness control from factory setting to minimum level, the 3" block pattern shall be
extinguished when contrast control is set minimum also.

1.4.1.6 Linearity (set to 20 Ft-L at full white pattern first) at Crosshatch Pattern

(1) Vertical Non-linearity 5% max. as Fig.1
(2) Horizontal Non-linearity 5% max. as Fig.1
System Overview
230 4mm
4% max, second overshoot
1% max, third overshoot
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