Denon DVM-4800 Service Manual

Also see for DVM-4800: Specifications Operating instructions Service manual Operating instructions

Contents

16DVM-48005.4.1.1. Adjustment procedure1. While pressing PAUSE and OPEN/CLOSE buttons on theTangential Adjust ScrewTilt Adjust Screw 2 Tilt Adjust Screw 1main unit, press "5" on the remote control unit.2. Confirm that "J_xxx_yyy_zz" is shown on the front display.For your information:"yyy" and "zz" shown to the right have nothing to do withthe jitter value. "yyy" is the error counter, while "zz" isthe focus drive value.Note:Jitter value appears on the front display.3. Play test disc T01 (inner periphery).4. Adjust tangential adjustment screw so that the jitter value isminimized.5. Play test disc T43 (outer periphery).6. Adjust tilt adjustment screw 1 so that the jitter value isminimized.7. Play test disc T43 (outer periphery).8. Adjust tilt adjustment screw 2 so that the jitter value isminimized.9. Repeat adjusting tilt adjustment screws 1 and 2 alternatelyuntil the jitter value is minimized.5.4.1.2. Important points1. Make tangential adjustment first, and then make tiltadjustment.2. Repeat adjusting two or three times to find the optimumpoint.3. Finish the procedure with tilt adjustment.Jitter value depends on the model:1. If the jitter value changes like B, the optimum point is easy tofind.2. If the jitter value changes like A, set the optimum point near themiddle.5.4.1.3. Check after adjustmentPlay test disc or any other disc to make sure there is no picturedegradation in the inner, middle and outer peripheries, and noaudio skipping. After adjustment is finished, lock eachadjustment screw in position using screw lock.5.4.1.4. Procedure for screw lock1. After adjustment, remove top cover, tray, clamper base andtraverse unit in this sequence.2. Lay the traverse unit upside down, and fix adjustment screwwith screw lock.3. After fixing, reassemble traverse unit, clamper base, trayand top cover.5.4. Optical adjustment5.4.1. Optical pickup tilt adjustmentMeasurement point Adjustment point Mode DiscTangential adjustment screwTilt adjustment screwT01 (inner periphery) playT43 (outer periphery) playDVDR-S15 or DVDT-S01Measuring equipment Adjustment valueNone (Main unit display for servicing is used.) Adjust to the minimum jitter value.Front Side