Sharp VT-3448X Service Manual page 39

response is obtained on the envelope waveform.
setscrew in the unloading mode.
that the envelope waveform does not change.
a) In the X value adjustment mode (see the Electrical
Adjustment), make a short-circuit between TP7701 and
main PWB and plug in the AC cord, to center the
tracking.
and adjust the A/C head position for maximum head
switching pulse low side envelope.
Finally tighten the screws @ and 0. (First tighten the
screw 0, and next the screw 0.) (Figure l-23)
(Reference: Final tightening torque: 0.6 N.m as prefer-
able.)
Figure l-36.
by playing back a recorded tape.
REPLACEMENT OF THE CAPSTAN D.D.
(DIRECT DRIVE) MOTOR
l Remove the cassette housing control assembly.
l Removal (Follow the order of indicated numbers.)
sensor PWB.
Remove the screws 0.
Capstan D. D.
motor
Figure l-37.
Capstan
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l Reassembly
sure not to allow the capstan shaft to hit the mechanism
chassis, and attach it with the three screws.
nector on the sensor PWB.
Notes:
capstan D.D. motor and chack the movement.
REPLACEMENT OF DRUM D.D. MOTOR
l Removal (Reverse the order in reassembly.)
Notes:
earth spring pops out of the pre-load collar.
Be careful not to lose it.
positioning holes in the D.D. rotor assembly and upper
drum assembly match.
(Match the upper drum's notch with the rotor's hole.)
are not damaged by the D.D. rotor assembly or other parts.
Figure I-38.
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