Acer AM501, Service Manual

Page: 14 / 85

10
4.2 Interface Signals
This color display shall have an analog video interface and shall be capable to operate with multiple
horizontal and vertical frequencies. Moreover it shall be capable to support compatible DDC1and
DDC2B signals.
4.2.1 Sync Input
Separate, composite TTL compatible
Polarity Positive or negative
4.2.2 Interface Frequency
Table 1:Interface Frequency
Horizontal line frequency
(KHZ)
±
500HZ
Vertical frame frequency
(HZ)
±
3HZ
31.649 59.94
46.875 75
48.363 60
53.674 85.061
4.2.3 Input Timing Limits
The monitor will accept all timings within the limits of table 2
Table 2: Input Timings Limits
Parameter Horizontal Vertical
Frequency (30 to 54) KHz (50 to 120)Hz
Blanking
≧
2.5
µ
s
≧
0.4ms
Back Porch
≧
1.0
µ
s
≧
0.1ms
Front Porch
≦
back Porch
≦
Back Porch
Sync Pulse
≧
0.7
µ
s
<
0.3ms
>
0.03ms