WARNING 1) This product contains components, which are critical for X-radiation safety. Read the Service manual carefully for proper replacement. Maximum 2nd anode voltage use high impedance meter, connect (-) to chassis, use a high voltage lead from (+) to 2nd anode. 2) Critical Components are marked with the symbol of X-radiation, replace only with same type and rating components.
REGULATION COMPLIANCE This monitor comply to the most current revisions of following regulations: UL 1950 Standard for safety of Information Technology Equipment including Electrical Business Equipment. Safety of Information Technology Equipment including Electrical CSA C22.2 No. 950 Business Equipment. EN 60 950 Safety of Information Technology Equipment including Electrical Business Equipment.
1.0 INTRODUCTION This document is related to a 15" CRT color monitor MM500 to be used with various kinds of graphic adapters, including IBMVGA, VESAVGA, ERGOVGA, SVGA, UVGA and XGA modes. It is intended as a mutisync monitor type based on microprocessor unit, capable to support all the video standards. This monitor, simply adjusting image size and centering by means of the user controls gathered on the front panel, can support other graphic standards.
2.2 Connecting the Monitor and Stand Align the stand’s four tabs with the slots on the bottom of the monitor. Insert the tabs into the slots. Slide the stand towards the front of the monitor. Figure 1: Monitor and Stand Connection NOTE: Special protection on control knobs and LED indicator needs to be taken care while you place the CRT side of side of monitor downwards.
2.4 The AC Connection Locate the AC port on the rear of the monitor. Plug the female end of the AC cord into the AC port. Plug the male end into the power supply. 2.5 The Signal Cable Connection Locate the ON/OFF power switch. See Figure 4. Make sure that the Monitor power switch is in the OFF position.
2.6 Monitor Tilt and swivel Adjustments The monitor is capable of both tilt and swivel adjustments. Figure 6: Tilt Adjustment With the tilt feature, the monitor is capable of vertical adjustments of +15° to -5°. The swivel feature allows for horizontal monitor adjustments of +45° to -45°. Figure 7: Swivel Adjustment...
3.0 FRONT CONTROLS 3.1 USER CONTROLS Figure 8: User Controls (This begel is representative) Power Switch Turns the monitor on and Reset Resets default values. Select button For selecting functions. Power LED Indicator Green States Light Light Light Flash Adjustments For adjusting the display in the selected function.
3.2 OSD Icon Summary Icon Function Brightness Contrast H. Size H. Position V. Size V. Position Pincushion Trapezoid Function Description Adjusts display brightness Adjusts display contrast Increases and decreases screen width Shifts display image right or left Increase and decrease screen height Shifts display image up or down Adjusts concave and convex portion of pincushion effect Adjusts the top and bottom display widths...
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 Polarity 4.2.2 Interface Frequency Table 1:Interface Frequency...
4.4 Brightness and Contrast Definitions: Active area This zone can be lighted when the background color is changed from black to any other color. Its dimensions, in terms of timing the "active area "times described in table 3 Raster area Under certain conditions (see table 4) this zone must be visible when no video input is applied.
4.5 Power inlet Power shall be applied to the display device through a standard three wire receptacle NEMA A/5261 or equivalent. 4.6 Power cord The power cord supplied with the monitor must conform to the International Standards described on part 8.0 and shall have physical and electrical characteristics such that to comply with any other specification item.
4.8 Internal connectors All internal connectors for the interconnection of sub assemblies must be distinct in their physical characteristics or polarization so as to prevent any misconnection which may cause permanent damage to the display. 4.9 Power Requirements The display device shall maintain the specified performances in the range described below: Frequency: Voltage: The following consumption requirements shall be met:...
4.10 Visual Characteristics All factory preset resolutions must guarantee the right display dimension and centering. Other resolutions can be adjusted correctly with the external controls as per section 2.5. In all resolution must be possible to adjust the monitor in full screen (overscan mode) by external controls.
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4.10.3 Picture Size Variation The change in display size shall be less than 3mm in width or 2mm in height at full white pattern.(250x188mm Brightness change from 5FL to 25FL Temperature change in 25°C±10°C 4.10.4 Display Centering Figure 9. Describes the pattern for this test. Basically a single pixel white line around the perimeter of the data area composes it, with marks for the horizontal ad vertical axes.
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4.10.7 Geometric Distortion By Luminance The test pattern is composed of two white areas and a black area, the three areas are equivalents. The input signal level is 700 mV with brightness control at cut-off and contrast control at maximum(see Figure 12).
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4.10.9 Misconvergence The display must conform to all the following requirements: Maximum convergence error. Area Center field of 195mm diameter Square field of 260 x 195 mm The maximum convergence error shall be measured for a white spot or line, and represents the maximum distance between the energy centers of any two primary colors.
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4.10.10 Image Stability (Jitter) Not perceivable Jitter will be present on the display, when displaying a cross-hatch pattern, at a distance of 500 mm from the screen. In any case it is not admitted a measured Jitter value greater than one dot (both on X axis or on Y axis).
4.10.14 Luminance Uniformity The variation in average display luminance between any area(with dimension approximate 2 cm of diameter)on standard flat white screen, must be less than 35% of the luminance of the brightest area with brightness control at cut-off and contrast control adjusted to 80 nits of luminance on the center of screen.
4.11 Functional Performance 4.11.1 Acoustical noise: The acoustical noise shall be less than 50dB when operating in normal condition, mode change or power on/off. 4.11.2 Turn off: Set unit at 20FL of full white screen, then turn off unit, image should disappear smoothly, no persistent spot and flash.
4.12 Environment Requirements 4.12.1 Non-adjusting operation 25℃ ± 10℃ 4.12.2 Operating Temperature Relative Humidity Altitude 4.12.3 Storage of shipment Temperature Relative Humidity Altitude TEST PROCEDURUE: Put in temperature chamber under 60°C Back to room temperature Put in temperature chamber under -20°C Back to room temperature The process repeat 2 times.
4.13 Reliability Requirements 4.13.1 Mean Time Before Failure ( MTBF ) 30,000 hours with 90% confidence level.(CRT less) 4.13.2 Reference Document MIL-STD-105D MIL-HDBK-217E 4.13.3 Electro-Static Discharge ( ESD ) Contact discharge: Apply 6KV,the set must be auto-recovery Apply 4KV,the display pattern doesn’t appear noise Air discharge: Apply 8KV,be disallow components damage or EEPROM data loss Apply 6KV,the display pattern does not appear noise.
4.14 White Balance Set the external BRIGHTNESS at the point that raster just cut off, adjust CONTRAST over the range from 5F-L to 20F-L, or reversed, with full-intensity reverse pattern, the color coordinate, measured by MINOLTA TV-COLOR ANALYZER-II (TV-2130), shall be within the limitation listed below: x=0.281 y=0.311 4.15 Luminance Uniformity...
5.0 ALIGNMENT PROCEDURE Warm up the monitor for at least 30 minutes before adjustment. Set the front of CRT to the east. Turn all VR set to center position. 5.1 B+ Voltage, G1, H. Position Adjustment Use front control key adjust the display size about 260mm, adjust VR501 let the voltage of FBT PIN3 cathode is 139±0.3V.
6.0 OPERATION THEOREM 6.1 H & V sync. processor The key component of this block is U2, it's function is separate horizontal sync, and vertical sync. To get the polarity fixed V-out, H-out. 6.2 Vertical deflection The vertical deflection circuit including synchronizer, vertical oscillator, vertical driver, vertical output amplifier.
6.3 Horizontal deflection circuit The horizontal deflection circuit is made up of HOR. synchronizer, HOR. oscillator, HOR. DRIVER, HOR. OUTPUT and HIGHT VOLTAGE GENERATOR. 6.3.1 Horizontal synchronizer and oscillator The horizontal sync. signal input to pin 1 of U401, to synchronize the horizontal oscillator, pin 5, 6, set FH min oscillator frequency.
6.4 X-RAY protection circuit The circuit prevents the X-RAY radiation from exceeding the allowable value when the Anode voltage of CRT rises abnormally. The voltage to be detected is obtained by rectifying the pulse from FBT pin8, when the voltage is overhigh, the transistor Q507 will turn on, then the horizontal driver signal will be disable, the horizontal deflection circuit and high voltage generator immediate shout off.
6.8 Power Supply 6.8.1 Degaussing CKT: Under conditions of power on Q950 will turn on for a period of time decided by C950 and R952, during that time period the degaussing current will flow through the degaussing coil. 6.8.2 Flyback Mode Power Conversion CKT The flyback power conversion CKT consists of a high frequency transformer (T901), output rectifiers and filters, and IC3842 control CKT (U901), and it uses the primary side feedback to regulate the output voltages.
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6.8.3 Power Saving Control Switch Q940 is an ON/OFF switch of 13VS, when received a suspend signal (PS1 from high to low) which comes fromų-p, Q940 will turn off making the monitor to go to suspend mode. U900 be control by H-Sync. And V-Sync. detective CKT. When H-Sync. and V-Sync. disappear , U900 provides Vref to U901 PIN2, the power supply slut - down and unlatch to enter OFF mode.
8.1 Trouble Shooting 8.1.1 Power Supply Check Start Check fuse, FUSE OPEN Q901 VDS waveform normally? Is 7.5V in spec? Is 13V in spec? Is 60V volage correct? Combine with monitor check operating frequency? Stop Check and repair EMI filter and Q901, I/P Rectifier R 905,U901,R906 Check and repair Q902,...
8.2 Monitor Check Flow Chart 8.2.1 No Raster No raster Check Power indector lighted Check contrast & brightness control adjust to MAX. Check HEATER voltage= +6.3VDC G1=-40-60VDC G2=450-600VDC Check CRT Check AC power supply power input Check Q402 collector voltage about 1200Vpp Check F.B.T Check power...
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A. FRU BOM A-1 Main PCBA-- 456A3630012 A-2 Video PCBA—452A3630001 B. BOM LIST The item of parts marked with yellow are recommended and Unique parts list, and items marked with Blue are top 20 failures provided by our PE if component level repair is required.