Daewoo DV- K504N-SJ, Technical Manual

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61
ELECTRICAL ADJUSTMENTS (2HEAD & 4HEAD MODEL)
PG (Pulse Generator) Shifter Adjustment (Fig. 3)
Test Points: PT01 PIN
#
Main
Video Out Jack Rear Panel
Adjust: R595 (PG Shifter) Main
The Pulse Generator (PG) Shifter determines the video head
switching point during playback. Misadjustment of the PG
Shifter may cause head switching noise in the picture and/or ver-
tical jitter.
1. Load the instrument with an alignment tape and play back the
color bar signal or monoscope signal.
2. Connect channel-1 scope probe (1V/div.: 50µsec/div.) to
PT01 PIN
#
. Trigger the scope on channel-1.
3. Connect channel-2 scope probe (1V/div.) to the Video Out
Jack.
4. Set the scope to (-) slope and adjust the PG Shifter control
VR595 so that the trailing edge of the SW 30Hz pulse is
placed 6.5H±0.5H (horizontal) lines before the start of verti-
cal sync pulse.
SWITCHING
SW30Hz
PULSE
VIDEO
OUTPUT
V. SYNC
6.5H±0.5
Fig. 3 - PG Shifter Adjustment