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DRUM ENTRANCE / EXIT
TEST POINTS
MEASURING EQUIPMENT
ADJUSTMENT
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.
DRUM ENTRANCE
DRUM EXIT
Fine tuning of the envelope at
the drum entrance/exit (I)
Fig.49
S/W PULSE TEST PIN
ENVELOPE TEST PIN
OSCILLOSCOPE
VR CONTROL
S/T GUIDE ROLLER
31
PATH ADJ. JIG
PATH ADJ. JIG
PATH ADJ. JIG
TAPE TRANSPORTING SYSTEM
Fine tuning of the envelope at
the drum entrance/exit (II)
Fig.50
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