Caple C702G Wartungshandbuch PDF herunterladen (Seite 150)

8-25

3) Power Management System (PMS) Circuit

PMS circuits reduce power consumption. They have 3 modes of stand-by, suspend and off.

Table 4 PMS Mode (IC801)

Mode Pin 22 PMS_SUS# Pin 8 PMS_OFF# Pin 54 POWER LED

On High High Low

Stand-by High High Low

Suspend Low High Pulse(1KHz)

Off Low Low High

a. Stand-by Mode

When the horizontal sync is not input, this monitor enters stand-by mode in a few seconds. The video signal

of IC711 pin 29, 32, 35 are stopped by the video blank signal from IC801 pin 10. Then CPU (IC801) controls

the DAC outputs of the I/O Expander(IC571) to high. (fH1～fH3 and fH5～fH7 becomes high.)

When the horizontal sync is input, this monitor returns to normal operation mode with the shortest recovery

time.

b. Suspend Mode

When the vertical sync is not input, this monitor enters suspend mode in a few seconds. IC801 outputs

pulse(1kHz) from pin 54. Because Q101 and Q102 toggle on-off alternately, LED111,LED112 and

LED113 turn yellow. IC801 pin 22 outputs low to operate each power saving circuit. When the vertical

sync is input to this monitor, it becomes normal operation mode with longer recovery time than stand-by

Mode.

c. OFF mode

When the horizontal sync and vertical sync are not input, this monitor enters off mode in a few seconds.

IC801 pin 8 becomes low, then IC8G2 (5V regulator) turns off.

1 2 ... 145 146 147 148 149 150 151 152 153 154 155 ... 285 286

Keine Kommentare

Caple C702G Wartungshandbuch Seite 150