Zenith R50V26 Service Manual

Also see for R50V26: Operating guide

Contents

Zenith R50V26 Service Manual Manual pdf 43 page image

SERVICE ADJUSTMENTSPV154 - 923-03506 3-19 ZP26/28 - SERVICINGLeft of Center and Blue is offset Right of center. Pleaseuse the following information to accurately offset Redand Blue from center. Also see Overlay Dimensions forfurther details.PREPARATION FOR ADJUSTMENT:· Video Control should be set at Factory Presetcondition.· Static Focus adjustment should be finished.ADJUSTMENT PROCEDURE1. With Power Off, press the Service Only switch onthe Convergence PWB. While holding the ServiceOnly Switch down, press the Power On button. Pic-ture will appear without convergence correction.2. Press the Service Only Switch to receive the DCUcross-hatch signal.3. Turn the centering magnets of Red, Green and Blueand adjust so that the center point of the cross-hatch pattern satisfies the diagram below. (DCUdata is cleared). Remember Green is Centered. Redis to the left of Green and Blue is to the right ofGreen as indicated below.o All Vertical positions are geometric center of screen.o Parameters are +/- 2mm.MODEL RED OFFSET LEFTOF CENTERBLUE OFFSETRIGHT OF CENTER ASPECT65" 15mm 25mm 16 X 961" 15mm 25mm 16 X 956" 15mm 25mm 16 X 9VERTICAL SIZE ADJUSTMENTVERTICAL SIZE:· Receive an NTSC signal.· Video Control should be set to Factory Presetcondition.· Convergence should not be corrected.ADJUSTMENT PROCEDURE:1. With Power Off, press and hold the Service OnlySwitch on the Convergence PWB, then press thePower Button and Release. (Digital Convergencedata is cleared). Then release the Service OnlySwitch. DCU Grid appears.2. Adjust using R607 (Vertical Size Adj. VR) to matchmarks on the Overlay. (See Figure Below)3. Turn Power Off.NOTE: Centering magnet may be moved to facilitate.Distance is important, not centering.ALTERNATE METHOD:Adjust Vertical Size until the size matches the chartbelow.ALTERNATE METHOD:Adj Vert Size until the size matches the chart below.Scrn Size 56” 61” 65”Scrn Format NORM NORM NORML= 590 645 690All Adjustments are +/-5mmHORIZONTAL SIZE ADJUSTMENTPREPARATION FOR ADJUSTMENT· Display Mode NORMAL· Install the correct Overlay.· Input an NTSC Signal.· Digital Convergence RAM should be cleared.· With Power Off, press the Service Only switch onthe Convergence PWB. While holding the ServiceOnly Switch down, press the Power On button andRelease. DCU Grid will appear without convergencecorrection.NOTE: After entering DCAM, with each press of the ServiceOnly Switch, the picture will toggle between Videomode and DCU Grid.· Project only the Green raster by selecting GreenAdjustment mode and pressing the MENU button.ADJUSTMENT1. Adjust using R711 (Horz. Size Adj. VR) to matchmarks on the Overlay. (See Figure Below)2. Press “Power Off” to exit DCAM. (Digital Conver-gence Adjustment Mode.)ALTERNATE METHOD:Adj Horiz Size until the size matches the chart below.Screen Size 56” 61” 65”Screen Format NORM NORM NORML= 1165 1270 1355All Adjustments are +/-5mmBEAM FORM ADJUSTMENTPREPARATION FOR ADJUSTMENTIMPORTANT: Screen format should be “NORMAL”.1. Pre Heat, Cut-Off, Pre-optical focus, DCU PhaseData, H. Pos Course, Raster Tilt, Beam Alignment,Raster Position, Vertical and Horizontal Size ad-justment should be completed.2. Brightness: 90%, Contrast: Max.3. Input a NTSC DOT signal.ADJUSTMENTS PROCEDURE:4. Green CRT beam shape adjustment.5. Short-circuit 2P sub-mini connectors on Red andBlue CRT PWB to project only the Green beam.6. Turn the green static focus VR fully clockwise.7. Make the dot at the screen center a true circle,using the 4-Pole magnet shown in (Figure 1 be-