Magnavox 27MDTR10S Service Manual

Also see for 27MDTR10S: Owner's manual

2-3-3 TD603MA1-A. Preliminary/Final Checking andAlignment of Tape PathPurpose:To make sure that the tape path is well stabilized.Symptom of Misalignment:If the tape path is unstable, the tape will be damaged.Note: Do not use an Alignment Tape for this proce-dure. If the unit is not correctly aligned, the tape maybe damaged.1. Playback a blank cassette tape and check to seethat the tape runs without creasing at Guide Rollers[2] and [3], and at points A and B on the lead sur-face. (Refer to Fig M3 and M4.)2. If creasing is apparent, align the height of the guiderollers by turning the top of Guide Rollers [2] and[3] with a Guide Roller Adj. Screwdriver. (Refer toFig. M3 and M5.)3. Check to see that the tape runs without creasing atTake-up Guide Post [4] or without snaking betweenGuide Roller [3] and AC Head. (Fig. M3 and M5)4. If creasing or snaking is apparent, adjust the TiltAdj. Screw of the AC Head. (Fig. M6)1-B. X Value AlignmentPurpose:To align the Horizontal Position of the Audio/Control/Erase Head.Symptom of Misalignment:If the Horizontal Position of the Audio/Control/EraseHead is not properly aligned, maximum envelope can-not be obtained at the Neutral position of the TrackingControl Circuit.1. Connect the oscilloscope to TP1403 (ENV) andTP1201 (CTL-AMP-OUT) on the Main CBA. UseTP1401 (RF-SW) as a trigger.2. Playback the Gray Scale of the Alignment Tape(VFMS0001H6) and confirm that the PB FM signalis present.3. Set the Tracking Control Circuit to the center posi-tion by pressing CH UP button then “ PLAY ” buttonon the unit. (Refer to note on bottom of page2-3-4.)4. Use the X-Value Adj. Screwdriver so that the PBFM signal at TP1403 (ENV) is maximum. (Fig. M6)5. Press CH UP button on the unit until the CTL wave-form has shifted by approx. +2msec. Make surethat the envelope is simply attenuated (shrinks inheight) during this process so that you will knowthe envelope has been at its peak.Guide Roller [2] Guide Roller [3]A BTake-up Guide Post [4]AC HeadFig. M3Lead Surface of Cylinder Tape Fig. M4Guide RollerTapeCorrect IncorrectTake-up GuidePostTapeFig. M5Azimuth Adj. ScrewX-Value Adj.ScrewdriverTilt Adj. ScrewAC HeadFig. M6