Panasonic PV-DF2002 Service Manual page 17

7.3.8 PG SHIFTER ADJUSTMENT
TOP PREVIOUS NEXT
Purpose:
l
Determine the Video Head Switching Point during Playback.
Symptom of Misadjustment:
l
May cause Head Switching Noise and/or Vertical Jitter.
Test Point :
l
TP3001 (Main C.B.A.),
TP6205 (Main C.B.A.)
Adjustment :
l
PG SHIFTER (EVR)
Specification :
l
6 H±1 H (0.38 ms±0.06 ms)
INPUT :
l
----------
Mode :
l
SP Playback
Equipment :
l
Oscilloscope,
VHS Alignment Tape (VFMS0003H6)
1. Insert the VHS Alignment Tape and playback in SP mode.
2. Connect the channel-1 scope probe to TP3001 and the channel-2 scope probe to TP6205. Used
TP6205 as a trigger.
3. Select PG SHIFTER in EVR adjustment mode and adjust value so that the trailing edge of the
head switching pulse is placed 6 H±1 H (0.38 ms±0.06 ms) before the start of the vertical sync
pulse.
http://servis-manual.com/
Fig. E7