參數(shù)資料
型號(hào)： STUDIOWORKS995U(CB995BU)
英文描述： Monitor_ICs:VPS13 M62501P UPC1884ACT PQ6RD083
中文描述： Monitor_ICs：VPS13 M62501P UPC1884ACT PQ6RD083
文件頁(yè)數(shù)： 30/47頁(yè)
文件大?。?/td> 6471K
代理商： STUDIOWORKS995U(CB995BU)
DESCRIPTION OF BLOCK DIAGRAM
1. SMPS (Switching Mode Power Supply) Circuit
When you turn on the power switch, the operating
procedure is as follows:
1) The AC line voltage is rectified by the bridge diode
(D901).
2) The control IC (IC901) starts switching and generates
switching pulses in the primary turn of the SMPS
transformer (T901).
3) The switching pulses of the primary turns are induced
the secondary turns of the transformer by the turn
ratio. This pulses are rectified by each diode. (D909,
D910, D911, D914, D915, and D917.)
4) Each rectified DC voltage (185V, 75V, 9V, 15V, and
6.3V) is supplied to the main circuit.
2. Over Voltage Protection Circuit
When the input voltage of IC901 Vin (pin4) is more
than 22V, all the secondary voltages of the SMPS
transformer (T901) down to low value.
3. Display Power Management Circuit
1) Stand-by and Suspend mode.
When no input of horizontal or vertical sync, Q909,
Q910, Q911, Q912, Q913, and Q914 are turned off.
Then the input power consumption is below 15 watts.
2) OFF mode.
When no input of horizontal and vertical sync, Q909,
Q910, and Q911 are turned off. Then the input power
consumption is below 8 watts.
4. X-ray Protection Circuit
When the high voltage reaches to 30kV in an abnormal
case, the high voltage detector circuit, IC702, R787,
R788, R789, R790, R791, ZD704 and IC701 starts
operation to shut down high voltage circuit.
5. Microprocessor Control Circuit
The operating procedure is as follows:
1) Horizontal and vertical sync signals are supplied to
the microprocessor (IC401).
2) Microprocessor (IC401) discriminates the operating
mode from the sync polarity and resolution.
3) After microprocessor reads these adjusted mode data
stored at EEPROM, it controls operating mode data
through Pulse Width Modulation ports.
4) Users can be control screen condition by the
Enter button and the OSD Select/Adjustment
(
knob.
)
6. D/D Convert Circuit
To obtain constant high voltage, this circuit supplies
controlled DC voltage for FBT and horizontal deflection
circuit according to the horizontal sync frequency.
7. Horizontal and Vertical Sync Processor Circuit
The horizontal and vertical sync processor IC (IC701)
has a sync detector, a saw-tooth generator, and drive
function. So output horizontal and vertical drive signal,
control screen distortions.
8. Horizontal S-correction Circuit
This circuit corrects the horizontal linearity for each
horizontal sync frequency.
9. Horizontal Drive and Output Circuit
This circuit is a horizontal deflection amplifier for raster
scan.
10. ABL Circuit
This circuit limits the beam-current for the reliability of
CRT.
11. Vertical Output Circuit
This circuit takes the vertical ramp wave from the
TDA4858 (IC701) and performs the vertical deflection by
supplying the saw-tooth wave current to the vertical
deflection yoke.
12. Blanking and Brightness Control Circuit
Blanking circuit eliminates the retrace line by supplying a
negative pulse wave to the G1 of the CRT, and
brightness control circuit is used for control of the screen
brightness by changing the DC level of G1.
13. Video Processor Circuit
Video processor circuit consists of the video drive output
block. The video drive IC (IC302) receives the video
signal from PC. The gain of each channel is controlled by
the voltage of contrast pin.
Cut-off circuit compensate different voltage of each
channel between the cathode and the G1 of CDT.
14. OSD (On Screen Display) Circuit
This circuit displays on the screen information of the
monitor's status.
- 14 -
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