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PLAYBACK PHASE ADJUSTMENT
TEST POINTS
MEASURING EQUIPMENT
ADJUSTMENT
The Phase generator (PG) shifter decides the VIDEO HEAD switching point when a TAPE is played back. In case the Phase
generator (PG) shifter is not correctly tuned, HEAD switching noise or vertical jitter may occur.
1) Connect the PATH ADJ. JIG to PTO1 of the MAIN CIRCUIT BOARD.
2) Play the ALIGNMENT TAPE (COLOUR BAR SIGNAL OR MONOSCOPE SIGNAL).
3) Connect the channel-1 scope probe to the S/W PULSE TEST PIN of the PATH ADJ. JIG.
4) Connect the channel-2 scope probe (1V/div.) to the VIDEO OUT of the MAIN CIRCUIT BOARD.
5) Play back the ALIGNMENT TAPE.
6) Adjust the PG volume for time interval of 6,5Hz±0,5Hz between switching pulse and V-sync signal.
SW. PULSE
VIDEO OUTPUT
S/W PULSE TEST PIN
VIDEO OUT
OSCILLOSCOPE
VR595 (PG SHIFTER)
SWITCHING
Playback phase adjustment
Fig.47.
29
PATH ADJ. JIG
MAIN CIRCUIT BOARD
MAIN CIRCUIT BOARD
V.SYNC
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