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H. DRUM ENTRANCE /EXIT (See Fig. 5-8, 5-9)
a. Connect the PATH ADJ. FIXTURE to PT01 the MAIN CIRCUIT BOARD.
b. Play back the ALIGNMENT TAPE (COLOR BAR 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 to the ENVELOPE TEST PIN of the PATH ADJ. FIXTURE.
e. When turning the VR CONTROL of the PATH ADJ. FIXTURE clockwise or counter-clockwisw, affirm
that the envelope thickness changes uniformly.
f. If the envelope is not uniform and regular, adjust the S/T GUIDE ROLLER.
TEST POINTS
S/W PULSE TEST PIN PATH ADJ. FIXTURE
ENVELOPE TEST PIN PATH ADJ. FIXTURE
MEASURING EQUIPMENT OSCILLOSCOPE
ADJUSTMENT
VR CONTROL PATH ADJ. FIXTURE
S/T GUIDE ROLLER TAPE TRANSPORTING SYSTEM
DRUM ENTRANCE
DRUM EXIT
Fig. 5-8 FINE TUNING OF THE ENVELOPE AT THE
DRUM ENTRANCE/EXIT (I)
Fig.5-9 FINE TUNING OF THE ENVELOPE AT THE
DRUM ENTRANCE/EXIT (II)