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Adjustments

25

2.4.3 Horizontal Pincushion Distortion

When the sides of a video display are bowed, the effect is known as

pincushioning or barreling, depending on whether the sides are bowed in

or out.
To check and adjust horizontal pincushion distortion:
1. Place the monitor so it is facing east or west. Degauss the monitor

whenever you change its direction.

2. Display the circle-crosshatch screen.
3. Turn the PIN AMP (RV203) control so the right and left sides of the

picture are linear.

PIN AMP ma-0936-89

4. Turn the KEY (RV201) and KEY BAL (RV202) controls so the widths

of the top and bottom sections of the picture are equal.

KEY and KEY BAL ma-0939-89

Содержание VR297

Страница 1: ...VR297 Color Monitor Service Guide Order Number EK VR297 SV 001 digital equipment corporation maynard massachusetts...

Страница 2: ...a license and may be used or copied only in accordance with the terms of such license No responsibility is assumed for the use or reliability of software on equipment that is not supplied by Digital E...

Страница 3: ...ss Luminance 12 1 2 7 Bright Area at Left Margin 13 2 Adjustments 2 1 Before You Start 15 2 2 Using the Radiance Meter 16 2 3 Color Adjustments 18 2 4 Deflection Adjustments 20 2 4 1 Vertical Linearit...

Страница 4: ...High Voltage Block K Board 41 3 11 H STAT Control 43 3 12 H J Control Block Assembly 44 A VR297 Documentation B Alignment Screens B 1 Circle Crosshatch Pattern 47 B 2 All E s Pattern 48 B 3 Color Bar...

Страница 5: ...Contents v Tables 1 Tools and Equipment viii 2 VR297 Recommended Spares List viii...

Страница 6: ...tation Alignment screens VR297 Color Monitor The VR297 color monitor has a 432 mm 17 inch direct view antiglare screen with contrast enhancement The monitor s built in tilt swivel assembly lets the us...

Страница 7: ...26 Vac 60 Hz 29 25449 198 to 242 Vac 50 Hz 29 25450 Recommended Spares List The following is the recommended spares list for the VR297 color monitor Table 2 VR297 Recommended Spares List Spares Part N...

Страница 8: ...7813 4 381 997 01 Main harness 29 27807 1 937 755 11 PCB plastic parts 29 27816 A 1499 498 A Perforated metal shield 29 27814 4 384 359 01 Pot alignment tool 29 27815 4 382 826 01 Rear cabinet 29 2781...

Страница 9: ...ection 1 2 provides the actual flowcharts for troubleshooting specific problems The flowcharts instruct you when to perform checks on the monitor replace parts or make adjustments If you complete all...

Страница 10: ...display often indicates which problem is occurring Isolate the Problem After you clearly identify a problem check the list of problem types at the beginning of Section 1 2 Select the type that best de...

Страница 11: ...me from two sources your host system or your monitor Types of Problems The following flowcharts cover seven types of monitor problems If you have this problem See this section A blank screen no video...

Страница 12: ...RUN THE SYSTEM REPLACE THE A BOARD 3 7 FOR A GOOD CONNECTION 5 IS THE IMAGE NO REPLACE THE H J CONTROL BLOCK 3 12 DISPLAYED ON THE SCREEN WAS THE YES YES PROBLEM EXTERNAL TO THE STOP SECTION NUMBERS A...

Страница 13: ...MAGE 4 NO STOP REPLACE THE D BOARD 3 6 ARE THE NO TUBE FILAMENTS IMAGE DISPLAYED LIT YES ARE THE THREE NO VOLTAGES WITHIN IS THE 4 REPLACE THE POWER SUPPLY 3 4 PERFORM THE D BOARD ADJUSTMENTS 2 4 REPL...

Страница 14: ...OWN CHECK THE AC POWER AT THE WALL OUTLET YES IS THERE POWER NO PRESENT AT THE YES CALL AN ELECTRICIAN IS THE POWER 1 STOP SECTION NUMBERS ARE IN PARENTHESES 1 REPLACE THE FUSE 2 PLUG IN THE POWER COR...

Страница 15: ...IS THE VOLTAGE NO GREATER THAN CHECK THE C14 POINT ON THE B BOARD 55 Vdc YES IS THE VOLTAGE NO REPLACE THE POWER SUPPLY 3 4 GREATER THAN PERFORM THE A BOARD ADJUSTMENTS 2 3 55 Vdc YES REPLACE THE A BO...

Страница 16: ...AP THE RED AND BLUE CABLES AND SEE IF IMAGE MISSING ANY COLOR THE MISSING COLOR CHANGES IF SO THEN REPLACE THE VIDEO CABLE SATURATION BY A COLOR WAS THE YES PROBLEM EXTERNAL STOP TO THE MONITOR NO THE...

Страница 17: ...3 Purity START DISPLAY THE GREEN SCREEN IS THE SCREEN NO DEGAUSS THE MONITOR BY TURNING THE POWER SWITCH OFF THEN BACK ON COMPLETELY ONE COLOR YES IS YES THE SCREEN COMPLETELY ONE COLOR NO REPLACE TH...

Страница 18: ...NO TYPE OF MISCONVERGENCE MISCONVERGENCE HORIZONTAL VERTICAL OR BOTH YES YES DOES THE PERFORM THE L BOARD ADJUSTMENTS 2 4 6 H STAT CONVERGE STOP NO REPLACE THE H STAT CONTROL NEAR THE A BOARD 3 11 CO...

Страница 19: ...URE THE DISTANCE FROM THE LEFT SIDE OF THE IMAGE TO THE RIGHT SIDE AT SEVERAL POINTS ACROSS THE SCREEN TOP TO BOTTOM AND SIDE TO SIDE YES STOP NO SIDE TO SIDE AT REPLACE THE D BOARD 3 6 PERFORM THE D...

Страница 20: ...N THE MONITOR REFER TO THE SYSTEM DOCUMENTATION AND RUN THE GRAPHIC DIAGNOSTICS THE G2 CONTROL REPLACE THE A BOARD 3 7 RECONNECT THE VIDEO CABLES AND PERFORM THE A BOARD NO REPLACE THE WHOLE 2 3 MONIT...

Страница 21: ...THE H PHASE CONTROL ON THE D BOARD 2 4 IS THE BRIGHT NO AREA STILL ON STOP YES REPLACE THE D BOARD 3 6 PERFORM THE D BOARD ADJUSTMENTS 2 4 SECTION NUMBERS ARE IN PARENTHESES REPLACE THE A BOARD 3 7 P...

Страница 22: ...s already correct you can skip that adjustment and go on to the next one You must use the screen alignment test patterns to make all adjustments Use Section 2 1 to set up the monitor for adjustments U...

Страница 23: ...you remove the rear cabinet assembly Before you perform adjustments set up the monitor as follows First remove the rear cabinet assembly Section 3 1 1 Place the monitor on a nonconductive surface 2 R...

Страница 24: ...cap from the radiance meter s sensor head and connect the occluder to the radiance meter CAUTION Avoid excessive force when tightening the occluder or you may damage the radiance meter Do not touch t...

Страница 25: ...POWER ON W BACKLIGHT position when you are using the radiance meter with batteries 4 Set the range switch to the second position from the top 1 999 5 Place the occluder firmly against the center of t...

Страница 26: ...olor adjustments A Board adjustments ma 0951 89 To adjust the monitor s color 1 Set the following controls on the A board to minimum fully counterclockwise Green drive RV403 Blue drive RV402 Red drive...

Страница 27: ...drive RV401 clockwise until the meter reads 0 174 9 Type T 85 and press Return to display the green screen 10 Adjust the green drive RV402 clockwise until the meter reads 0 195 11 Type T 86 and press...

Страница 28: ...nts Vertical linearity Vertical centering Vertical height Horizontal linearity Horizontal phase Horizontal centering Horizontal width Side pincushioning Trapezoid Focus For these adjustments select th...

Страница 29: ...same height If the squares are not all the same height go to the next step 3 Refer to the next two figures Turn the V LIN BAL RV103 control to equalize the height of squares in symmetrical positions a...

Страница 30: ...o vertically and horizontally center the screen and adjust the screen size 1 Turn the V CENT control on the front panel to its center click 2 Place the monitor so it is facing north or south Degauss t...

Страница 31: ...l on the D board until the raster comes to the center of the CRT 8 Turn the H SIZE RV204 control to set the horizontal size of the screen s center to 280 mm 11 0 inches 9 Turn the H PHASE RV205 contro...

Страница 32: ...24 Adjustments Vertical and Horizontal Centering Standard ma 0947 89 Vertical and Horizontal Size Standard ma 0945 89...

Страница 33: ...izontal pincushion distortion 1 Place the monitor so it is facing east or west Degauss the monitor whenever you change its direction 2 Display the circle crosshatch screen 3 Turn the PIN AMP RV203 con...

Страница 34: ...near follow the steps in the next figure SIDE PIN BAL ma 0938 89 2 4 4 Top and Bottom Pincushion Distortion To adjust top and bottom pincushion distortion 1 Display the circle crosshatch screen 2 Set...

Страница 35: ...ustments 27 TOP and BOTTOM PHASE Adjustment 1 of 2 ma 0935 89 TOP and BOTTOM PHASE Adjustment 2 of 2 ma 0937 89 4 Turn the TOP AMP and BOTTOM AMP controls to adjust the lateral line horizontally as sh...

Страница 36: ...t the green input cable with the BNC connector from the rear of the monitor The screen should roll vertically and horizontally 3 Turn the H FREQUENCY RV207 control on the D board to minimize the horiz...

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