Panasonic TX-21GV1, Service Manual

Page: 31 / 53

DRUM ENTRANCE / EXIT
S/W PULSE TEST PIN PATH ADJ. JIG
TEST POINTS
ENVELOPE TEST PIN PATH ADJ. JIG
MEASURING EQUIPMENT OSCILLOSCOPE
VR CONTROL PATH ADJ. JIG
ADJUSTMENT
S/T GUIDE ROLLER TAPE TRANSPORTING SYSTEM
1) Connect the PATH ADJ. JIG to PTO1 on the MAIN CIRCUIT BOARD.
2) Play back the ALIGNMENT TAPE (COLOUR BAR 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 to the ENVELOPE TEST PIN of the PATH ADJ. JIG.
5) When turning the VR CONTROL of the PATH ADJ. JIG clockwise or anti-clockwise, confirm that the envelope
thickness changes uniformly.
6) If the envelope is not uniform and regular, adjust the S/T GUIDE ROLLER.
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DRUM ENTRANCE
DRUM EXIT
Fine tuning of the envelope at
the drum entrance/exit (I)
Fig.49
Fine tuning of the envelope at
the drum entrance/exit (II)
Fig.50