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6.3.3 PG SHIFTER ADJUSTMENT
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Purpose:
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Determine the Video Head Switching Point during Playback.
Symptom of Misadjustment:
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May cause Head Switching Noise and/or Vertical Jitter.
Test Point:
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TP3001 (Main C.B.A.)
TP6205 (Main C.B.A.)
Adjustment:
●
R6201 (Main C.B.A.)
Specification:
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T = 6 +/- 1H (0.38 +/- 0.06msec.)
Mode:
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SP Playback
Equipment:
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Oscilloscope,
VHS Alignment Tape (VFMS0003H6)
1. Connect the channel-1 scope probe to TP3001 and the channel-2 scope probe to TP6205.
Trigger from channel-2.
2. Playback the VHS alignment tape, and then connect TP6003 to GND to be in PG Shifter
Adjustment mode.
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