Daewoo DV-K884N-SJ, Руководство по обслуживанию

Страница: 68 / 128

67
ELECTRICAL ADJUSTMENTS (Hi-Fi 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.
Stereo Separation Adjustment
Test Points: (–) Terminal of C166 Main
Adjust: R191
1. Connect scope prove to (–) Terminal of C166.
2. Receive RF signal.
RF signal condition
!
AUDIO: 1KHz 100% Mod.
@
RF OUT Level: 73dBµV
3. Adjust the STEREO SEPARATION Adjustment R191 so
that Audio signal (1KHz) level comes to be
700mVp-p±50mVp-p.
SWITCHING
SW30Hz
PULSE
VIDEO
OUTPUT
V. SYNC
6.5H±0.5
Fig. 3 - PG Shifter Adjustment