Zenith R50V26 Service Manual

Also see for R50V26: Operating guide

Contents

Zenith R50V26 Service Manual Manual pdf 42 page image

SERVICE ADJUSTMENTSPV154 - 923-03506 3-18 ZP26/28 - SERVICING6. Select Item H POSI and adjust the data so thatthe center of Video matches the location of theDigital Crosshatch pattern noted in step {4}.7. Exit from the I 2C Menu.1080I HD MODE ADJUSTMENT:1. Receive any 1080i (2.14H) signal and select thatinput.2. Press the SERVICE ONLY switch on the deflectionPWB and display the Digital Convergence Cross-hatch pattern.3. Mark the center of the Digital Convergence Cross-hatch Pattern with finger and press the SERVICEONLY switch to return to normal mode.4. Enter the I 2C Bus alignment menu (With Power Off,press and hold the SOURCE button on the frontpanel, then press the POWER button and Releaseboth buttons).5. Select Item H POSI H6. Adjust the data up or down slightly to match theVideo to the center location found in step (10).7. Exit from the I 2C Menu.NOTE: To enter the I2C Bus alignment menu, with PowerOff, press the SOURCE button on the front paneland hold it down, then press the POWER buttonand release both buttons. I2C adjustment menuwill appear.CHASSIS TILT (RASTER INCLINATION) ADJUSTMENTADJUSTMENT PREPARATION:· The set can face any direction.· Receive the Cross-Hatch Signal· VIDEO CONTROLS: Factory Preset.· SCREEN FORMAT: should be NORMAL mode.· The lens focus should have been coarse adjusted.· The electrical focus should have been coarseadjusted.· The Digital Convergence RAM should be cleared.· Turn power off, press and hold the SERVICE ONLYswitch on the Convergence PWB, then press thePOWER button.ADJUSTMENT PROCEDURE:GREEN:1. Apply covers to the RED and BLUE lenses or shortthe 2P Sub Mini connector [PTS] on R&B CRT PWBto produce only GREEN.2. Turn the Green deflection yoke and adjust the TILTuntil the green is level. [+/- 2mm tolerance]. Seediagram.RED:3. Remove cover or PTS short from RED CRT and alignRED with GREEN. [+/- 1mm tolerance when com-pared to Green]BLUE:4. Remove cover or PTS short from BLUE and coverthe RED CRT. Align BLUE with GREEN. [+/- 1mmtolerance when compared to Green]After Completion:5. Tighten DY Yoke Screws to 12+/-2 kg-cm.6. REMOVE ALL COVERS or SHORTS on the PTS con-nectors.7. Turn the Power Off.CHASSIS BEAM ALIGNMENT ADJUSTMENTPREPARATION FOR ADJUSTMENT:· Pre Heat, Pre-optical focus, DCU Phase Data, H.POSI Course and Raster Tilt adjustment should becompleted.· Brightness: 90%· Contrast Max.· Receive cross hatch signals, or dot pattern· RASTER TILT adjustment should be finished.· SCREEN FORMAT should be NORMAL mode.Adjustment procedure:1. Green (G) tube beam alignment adjustment:2. Short-circuit 2P subminiature connector plug PTSof Red (R) and Blue (B) on the CRT boards andproject only Green (G).3. Put Green (G) tube beam alignment magnet to thecancel state as shown in Figure 1. (See Figure 1.)4. Turn the Green (G) static focus VR counterclock-wise all the way and make sure of position of crosshatch center on screen.5. Turn Green (G) static focus VR clockwise all theway.6. Turn two Beam alignment magnet in any desireddirection and move cross hatch center to posi-tion found in step (3). (See Figure 2 below).7. If image position does not shift when Green staticfocus VR is turned, adjustment is complete.8. If image position does move, repeat steps [2]through [6].9. Conduct beam alignment for Red and Blue in thesame way.10. Red (R) focus on focus pack.11. Blue (B) focus on focus pack.12. Upon completion of adjustment, place a smallamount of white paint on the beam alignmentmagnets, to assure they don’t move.CHASSIS RED/BLUE RASTER OFFSET ADJUSTMENTRaster Offset is necessary to conserve Memory allocation.It is very important to remember that the Red is offset