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F. PLAYBACK PHASE ADJUSTMENT (See Fig. 5-6)
TEST POINTS
MEASURING EQUIPMENT
ADJUSTMENT
Phase generator (PG) shifter decides the VIDEO HEAD switching point when a TAPE is played back.
In case the Phase generator (PG) shifter isn't correctly tuned, HEAD switching noise or vertical jitter may
occur.
a. Connect the PATH ADJ. FIXTURE to PT01 of the MAIN CIRCUIT BOARD.
b. Play the ALIGNMENT TAPE (COLOR BAR SIGNAL OR MONOSCOPE SIGNAL)
c. Connect the channel-1 scope probe to the S/W PULSE TEST PIN of the PATH ADJ. FIXTURE.
d. Connect the channel-2 scope probe(1V/div.) to the VIDEO OUT of the MAIN CIRCUIT BOARD.
e. Play back the ALIGNMENT TAPE.
f. Adjust the PG volume for time interval of 6.5H±0.5H between switching pulse and V-sync signal.
S/W PULSE TEST PIN
VIDEO OUT
OSCILLOSCOPE
VR595 (PG SHIFTER)
Fig. 5-6 PLAYBACK PHASE ADJUSTMENT
31
PATH ADJ. FIXTURE
MAIN CIRCUIT BOARD
MAIN CIRCUIT BOARD
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