Sharp 14VT10X1, Service Manual

Page: 19 / 138

1.
2.
3.
4.
Detach the pinch roller from the capstan shaft.
Set the tension gauge by hooking the tension
gauge adapter onto the pinch roller shaft.
Gradually release the pressure to allow the pinch
roller to touch the capstan shaft. When the
pinch roller just touches the capstan shaft, read
the indication on the gauge.
Check that the reading of the tension gauge is in
the range of 1000 to 1200
CHECKING AND ADJUSTMENT OF TENSION
POLE POSITION
l Remove the cassette housing control assembly.
Vinyl tapes
Place the
the record mode.
roller
roller A
Check the
band
and plate
hole
cassette tape
Figure l-37.
l Checking
The guide rollers (A, B) operate to bring the tape
outside the cassette tape and simultaneously the
tension pole moves to the left, loading the tape.
At that time (loading completed), check the
position of the tension pole.
2. At the beginning of the tape (E-180), check that
the tension pole’s left side is aligned with the
supply impedance roller’s left side by sight.
3. Check that the end of the tape is neither curled
against the flange of the supply impedance
roller nor over it.
4. During the video search rewind mode with no
cassette tape in place, check that the supply
reel disk is free from the tension band.
l Position adjustment (record mode)
When the tension pole is at the right of the supply
impedance roller’s center:
Untighten the tightening screw, and shift the ten-
sion band adjustment bracket in the direction of
the arrow using a tension band and plate adjusting
jig until it is in the set value range (left side). Then
secure it with the tightening screw.
Supply impedance roller
Center
band Tension
and plate
arm
band adjustment bracket
Figure l-38.
l Position adjustment (record mode)
When the tension pole is at the left of the supply
impedance roller’s center:
Untighten the tightening screw, and shift the ten-
sion band adjustment bracket in the direction of
the arrow using a tension band and plate adjusting
jig until it is in the set value range (left side). Then
secure it with the tightening screw.
Supply Impedance roller
pole
Supply reel
band bracket
band
21 Figure