Panasonic AG-7510 Service Manual

CylinderFigure M15 Loading of PostsVIUV20.7V2iV208Figure M16 Spec. of Envelope Figure10. Turn the Tracking VR from end to end again andthen back to the detent (Fix) position.At the detent position, the RF envelopewaveform should be at maximum. If it is not atmaximum then “ADJUSTMENT OF THE A/C HEADHORIZONTAL POSITION". is necessary.(Refer to "FINE ADJUSTMENT OF THE A/C HEADHORIZONTAL POSITION”.)3-2-5. COARSE ADJUSTMENT OF THE A/C HEADHEIGHT* Note:This procedure should be performed only whenthe A/C Head is replaced.* Tools and Equipment Required:Check Light. .. VFK0343Nut Driver (Purchase locally)With the tape running, look at the lower edge ofthe control head by using the check light andcheck if the lower edge of tape runs along thelower edge of the control head.If it doesn’t slightly turn the nut (A) behind theA/C Head (Figure M17) to either lower or raise theA/C head so that the tape runs along the loweredge of the control head.Turn the nut (A) clockwise to lower the head, andcounterclockwise to raise it. (Figure M17)cr Nut (A)Figure M17,3-2-6. ADJUSTMENT OF THE A/C HEAD HEIGHTAND AZIMUTH* Note:This procedure should be performed only whenthe A/C Head is replaced and posts hight arereadjusted.* Tools and Equipment Required:Nut Driver (Purchase locally) VFM8180HMDHAlignment Tape.1. Connect the scope CH1 to the HD/NOR AudioOutput CH1 and the scope CH2 to the HD/NORAudio Output CH2 on the rear panel.2. Play back the 2nd portion (Normal Audio 6kHz)of the alignment tape, VFM8180HMDH.3. Adjust the screw (B) so that the CH2 outputlevel becomes maximum. (Figure M18)VVCH2MaximumasFigure M184, Then adjsut the nut (A) so that the CH2envelope becomes maximum.5. Readjust the screw (B) so that the phases ofthe both channel are matched as shown below.(Figure M19)6 kHz-Monaural: (Monoscope)'|CH2 NIL"i Ek EeFigure M19 Adjustment of A/C Head Height andAzimuth-(3)3-2-7. COARSE ADJUSTMENT OF THE A/C HEADHORIZONTAL POSITION* Note:This procedure should be performed only whenthe A/C head is replaced, and after performingthe tape interchangeability adjustment.* Tools and Equipment RequiresH.Position Adj. Fixture.Alignment Tape... VFK0328FM8180HMDH1, Set the tracking Control VR to the centerdetent (fixed) position.2. Connect the scope CH1 to TP5006 on the VideoHead Amp. C.B.A., and CH2 to TP4001 on theNORMAL AUDIO C.B.A.3. Play back ist pos (Monoscope and NormalAudio 3kHz) of the Alignment tape VFM8180HMDH.4. Adjust A/C head horizontal position screw sothat the phase of Audio drop out and RFenvelope drop out becomes almost the same.(Figures M20 and M21)2-14