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786PF
Service Manual
PROVIEW ELECTRONICS CO.,LTD
6F,No.1,Pau-Sheng Road,Yung-Ho City,Taipei 234,Taiwan
Tel : (886-2) 2231-6789 , Fax :(886-2) 2231-5678
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TABLE OF CONTENTS SERVICE WARNING····································· 1 A. IMPORTANT SAFETY INSTRUCTION····················· 1 B. SPECIFICATIONS···································· 2 C. TIMING CHART······································ 5 D. CONTROL LOCATION 6 ································· E. ADJUSTMENT CONTROL LOCATION····················· 7 F. ADJUSTMENT PROCEDURE···························· 8 G. BLO
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To prevent from fire or shock hazard,do not expose monitor to any rain or any form of water.High voltage is inside the monitor so please do not remove the back cover of the cabinet if you are not a qualified monitor engineer. Contact the local dealer or the nearest MAG branch office if you need help. A. IMPORTANT SAFETY INSTRUCTION Prior to using this service manual,please ensure that you have carefully followed all the procedures outlined in the user's manual for this product.
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See service manual for proper replacement.Maximum 2nd anode voltage must not exceed 30KV at any operating conditions. To measure 2nd voltage use high impedance meter connect (-) chassis, use a high voltage lead from (+) to 2nd anode. VR501,VR601 has been sealed against improper replacement or defeating the control. Instructions for proper replacement of such sealed controls should also be provided in the service information.
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1. Screen 17“ 0.25mm dot pitch,Pure Flat Square Tube,90°deflection, Anti-glare,Anti-static,Anti-reflection. 2. Visible Image Area 16.0 inch 3. Active Display Area 310mm (H) × 230mm (V) 4. Synchronization Range Horizontal 30 – 86 KHz Vertical 50 – 160 Hz 5. Power Source 100 – 240 Vac , 60/50 Hz 6. Power Consumption 120W (max.) 7. Input Signal Video Analog R.G.B. , 0.7Vp-p / 7
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D : Back Porch D B E E : Front porch Sync. C A
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a. Power Switch b. Power Indicator c.Encoder d. Enhance Key E. ADJUSTMENT CONTROL LOCATION 7
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IC601 IC901 VR501 L705 Q703 T501 C504 Q504 FBT F501 F. ADJUSTMENT PROCEDURE ﹟ Test Meter ITEM Adjusting ﹡Test Point Operation Program Menu. Value ﹫Pattern 8 VR601
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B+ ﹟ 1. Make the adjustment to the value shown at right 15.5V Digital Voltmeter Adjust by turning the VR501 on the main PCB. ±0.2V ﹡ D510 Negative A ﹫Crosshatch Pattern (31.5KHz,640x480) High Voltage ﹟ 1. Turn the power switch of the monitor OFF. 26.0KV Digital Voltmeter Adjust 2. Connect high voltage probe to Anode Cap and ﹟ High Voltage GND. Probe 3. Turn the power switch of the monitor ON. ﹡ Anode Cap-GND B (15 minutes)
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Y = 0.7 Background ﹟Color Analyzer 1. Set the contrast to MAX.,Brightness to Y=0.7 White set color is 9300 °K using the OSD. ± 0.1FL ﹫R.G.B off Balance 2. Set the OSD to COLOR of sub menu and press x = 0.283 (68KHz,1024x768) D Adjust knob. ± 0.01 3. Make the adjustment R.G.B BIAS low light to y = 0.297 the value shown at right by using encorder. ± 0.01 ﹟ White Color Analyzer 1. M
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Static ﹫ 1. Open the two pawels of the 4 pole magnets to Magenta color Convergence allow the red and blue vertical lines to unite. (31.5KHz,640x480) Adjust 2. Open and rotate the two pawels at a contrast angle so that the red and blue horizontal lines can unite. 3. If the vertical lines deviates,open the two powals at the deviation position and make a monitor J adjustment by changing its angle. 4. Display white crosshatch pattern. 5. Make the red and blue vertica
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G. BLOCK DIAGRAM 14 14
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BRIGHT HOR. LINE H. TROUBLE SHOOTING HINTS APPEAR ON THE SCREEN NO POWER T501(7) VOLTAGE No No T501 (7) CHECK AC120V IN 160V F501,D514 , AC220V IN 294V 160 V ? D515,D516, AC230V IN 308V D517 Yes No IC501 (7) CHECK IC501,R539, ＞ 14 V ? D505,ZD551 Yes
