Magnavox 19MDTR20 Service Manual

Also see for 19MDTR17: Features

Contents

2-3-5 MK14NMA_PC1-D. Azimuth Alignment of Audio/Control/Erase HeadPurpose: To correct the Azimuth alignment so thatthe Audio/Control/Erase Head meets tape tracksproperly.Symptom of Misalignment: If the position of theAudio/Control/Erase Head is not properly aligned, theAudio S/N Ratio or Frequency Response will be poor.1. Connect the oscilloscope to the audio output jackon the rear side of the deck.2. Playback the alignment tape (VFMS0001H6) andconfirm that the audio signal output level is 8kHz.3. Adjust Azimuth Adj. Screw so that the output levelon the AC Voltmeter or the waveform on theoscilloscope is at maximum. (Fig. M6)Note: Upon completion of the adjustment of AzimuthAdj. Screw, check the X Value by pushing the[CHANNEL K] or [CHANNEL L] buttons on the unitalternately, to check the symmetry of the envelope.Check the number of pushes to ensure presetposition. The number of pushes [CHANNEL K] buttonto achieve 1/2 level of envelope should match thenumber of pushes [CHANNEL L] button from center.If required, redo the “X Value Alignment.”1-E. Checking and Alignment of TapePath during reversingPurpose: To make sure that the tape path is wellstabilized during reversing.Symptom of Misalignment: If the tape path isunstable during reversing, the tape will be damaged.Note: Do not use an Alignment Tape for thisprocedure. If the unit is not correctly aligned, the tapemay be damaged.1. Insert a blank cassette tape into the tray and setthe unit to REV. Then confirm if the tape has beencurled up or bent at the Take-up Guide Post[4] orREV Post[5]. (Refer to Fig. M11 and M12.)2. When the tape has been curled up or bent, turnthe alignment screw to adjust the height of REVPost. (Refer to Fig. M11 and M13.)Take-up Guide Post [4]REV Post [5]Fig. M11Take-up GuidePostTapeREV PostTapeCorrect IncorrectFig. M12Fig. M13Tape GuideAssemblyAlignmentScrew