Zenith R50V26 Service Manual

Also see for R50V26: Operating guide

Contents

Zenith R50V26 Service Manual Manual pdf 41 page image

SERVICE ADJUSTMENTSPV154 - 923-03506 3-17 ZP26/28 - SERVICINGCHASSIS PRE-HEAT RUN ADJUSTMENTSPRESET EACH ADJUSTMENT VR TO THE CONDITIONSHOWN: BEFORE PRE HEAT RUN.1. Red and Green Drive VR on the CRT PWB. This ispart of the I 2C Service Menu. Set each to 3F. ToEnter Service Menu, press the SOURCE button andhold, then press the Power Button. Set comes onand displays Service Menu.2. SCREEN VR ON FOCUS PACK. Pre Set fully counter-clockwise.3. Focus VR on focus pack Pre Set fully clockwise.4. Allow set to operate at least 30 Minutes beforebeginning adjustments.CHASSIS CUT-OFF (SCREENS) ADJUSTMENTADJUSTMENT PREPARATION:· Pre Heat Run should be finished.· Be sure Screen Color Temperature setting is in theCOOL mode· Room Light should be minimal.ADJUSTMENT PROCEDURE:1. Go to I 2C ADJ. Mode. (With power Off, press theSOURCE button on the front panel and hold down,then press the POWER ON button and release bothbuttons. The Service Menu is displayed.)2. Set R DRV (COOL) to center data value (3F).3. Set G DRV (COOL) to center data value (3F).4. Confirm that the R, G, and B CUTOFF (COOL) datasettings are [80].5. Adjust Screen VRs on Focus Pack fully counter clockwise.6. Choose SERVICE item [1] of I2 C ADJ. Mode. SelectCURSOR RIGHT and the Vertical will collapses.7. Adjust any Screen VR. Screen VR should be turnedclockwise gradually until that particular color isbarely visible.8. Repeat for the other two colors.9. Exit SERVICE by pressing the CURSOR LEFT on re-mote.10. Exit SERVICE MENU by pressing the MENU key onthe remote.CHASSIS PRE-FOCUS ADJUSTMENTADJUSTMENT PREPARATION:Pre Heat Run should be finished.FOCUS ADJUSTMENT:1. Short the 2pin sub-miniature connector on theCRT PWB (PTS), to remove any color not beingadjusted and adjust one color at a time. (The ad-justment order of R, G and B is just an example.)PTSR for RED, PTSG for GREEN and PTSB for BLUE.2. Adjust the Focus VR for Red until Focus is achieved.(A Fine Adjustment will be made later.)3. Repeat for Blue and Green.DCU CROSSHATCH PHASE ADJUSTMENTADJUSTMENT PREPARATION:· Cut Off adjustment should be finished.· Video Control: Brightness 90%, Contrast Max.ADJUSTMENT PROCEDURE: NORMAL MODE1. Receive any NTSC signal.2. Press the SERVICE ONLY switch on the ConvergencePWB to enter DCAM mode and display DCU grid.3. Change the Remote Control into VCR mode.4. Press the (-) key on the Remote, Green Cross hatchappears.5. Change the Remote Control into TV mode.6. Press the QUIT key. (This is the Phase adjustmentmode).7. Adjust data value using the keys indicated in thechart below, until the data matches the values in-dicated in the chart.Saving Data Values:8. Change the Remote Control into VCR mode.9. Press the (-) key on the Remote to exit phase mode.10. Change Remote Control into TV mode.11. Press MULTI key TWICE to store the information.12. When Green dots are displayed, press the MUTEkey on remote.13. Press the SERVICE ONLY switch to return to normalvideo mode.PHASE MODE Display Format NORMAL DataADJUST ING Address Data Value4 and 6 keys on Remote PH-H BF2 and 5 keys on Remote PH-V 07Cursor Left t and Right u on Remote CR-H 4CCursor Up p and Down q on Remote CR-V 0CCHASSIS HORIZONTAL PHASE (COARSE) ADJUSTMENTADJUSTMENT PREPARATION:· Cut Off, DCU Phase adjustments should be finished.· Video Control: Brightness 90%, Contrast Max.ADJUSTMENT PROCEDURE WIDE MODE:1. Receive any NTSC crosshair signal.2. Screen Format is WIDE.3. Press the SERVICE ONLY switch on the convergencePWB and display the Digital Convergence Cross-hatch pattern.4. Mark the center of the Digital Convergence Cross-hatch Pattern with finger and press the SERVICEONLY switch to return to normal mode.5. Enter the I2C Bus alignment menu (With Power Off,press and hold the SOURCE button on the frontpanel, then press the POWER button and Releaseboth buttons).