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file:///E:/PV-9661_PV-9662/SVC/s0602020501.html
6.2.2.5.1 ENVELOPE OUTPUT ADJUSTMENT
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Purpose: To achieve a satisfactory picture and secure precise tracking.
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Symptom of Misadjustment: If the envelope is output poorly, much noise will appear in the picture. Then the tracking will lose precision and the playback picture will be distorted by any slight variation of the tracking control circuit.
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Equipment Required: Post Adjustment Driver (VFK0329)
1. Connect the oscilloscope to TP3002 on the Video Signal Process Section of the Main C.B.A. Use TP6205 as a trigger. 2. Place a jumper between TP6003 on the Video Signal Process Section and +5V(TP6009) on the System Control Section of the Main C.B.A. to defeat Auto Tracking. 3. Eject the tape and insert it again to access the Neutral Tracking position. 4. Play back the alignment tape and confirm that the RF envelope appears. 5. With Post Adjust Driver, adjust P2 and P3 post height so that the envelope waveform (V1/Vmax. is 0.7 or more.) becomes as flat as possible (No envelope drop). If the envelope drop appears on the left-half of the waveform, adjust P2post height. If the envelope drop appears on the right-half of the waveform, adjust P3 post height.
Fig. M6-1
file:///E:/PV-9661_PV-9662/SVC/s0602020501.html (1 z 3) [2006-01-28 11:10:54]
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