Sharp VC-90ET - Page 19

_ Detach the pinch roller from the capstan shaft.
2. Set the tension gauge by hooking the tension
gauge adapter onto the pinch roller shaft.
3. 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.
4. Check that the reading of the tension gauge is in
the range of 1000 to 1200 g.
CHECKING AND ADJUSTMENT OF TENSION
POLE POSITION
e@ Remove the cassette housing control assembly.
—_
e Setting
Vinyl tapes
uul,.
o> [rec]: =>
a
ac: the unitin
the record mode.
Cassette tape
(E-180)
Mechanism chassis
(a)
Guide roller A ic) suide roller.
YD
F.E. head i
Supply \
impedance F
roller
A cgth |" \ Tension arm Vinyl tapes
AX : poe
Check the leftside
position (by
sight).
Tension band“[)
and plate
adjusting ji :
se
ting
Peay
Video
cassette
tape
(E
-
180)
(b)
Figure 1-37.
@ Checking
1. 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.
19
VC-S90ET
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 center 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.
@ 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
tension 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 (center). Then
secure it with the tightening screw.
7 Center
_- Supply impedance roller
Tension pole
Tension band
ue Center and plate
Supply adjusting jig
impedance
roller
Tension
pole
Tension arm
Tightening
When the tension
pole is at the right
of the supply
impedance roller’s
center: ?
Tension band adjustment bracket
Figure 1-38.
@ 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
tension 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 (center). Then
secure it with the tightening screw.
a Center
! Supply impedance roller
Tension pole
Tension band
a Center and plate
adjusting ji
1 Supply ie Tension arm
impedance
roller . ;
Tension Tightening
pole
Supply reel
disk
Figure 1-39.
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