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4. MECHANISM CHECKS AND
ADJUSTMENTS
4-1. REEL TABLE TORQUE CHECK
1)With the power switch turned OFF, stick black vinyl tape
over the photo diodes of the tape sensors. Then turn the
power switch ON. Front loading will begin. Refer to
section 3-2 and Fig.3-2-2, and release the locks of the
tray lock lever and the lid opener lever.
NOTES:
1. The
measurements
must
be
taken
without
any
incandescent light or daylight.
2. If the mechanism cannot be put into PLAY, FF or REW
mode
by the
method
described
in 1) above,
make
a
dummy
cassette
tape,
as
shown
in
Fig.4-1-2.
The
dummy
cassette
tape
is made
as follows:
Unscrew
the five screws
on the underside,
remove
the reels,
leaf springs and other parts on the supply and take up
sides, make holes in the upper surface as wide as the reel
diameter, then assemble the parts.
2)
Put the mechanism
into REW
mode, wait at least 10
seconds,
then measure
the torque value of the reel
table on the supply side. It should be at least 600 g/cm.
Take the measurement with the torque gauge and
torque gauge adaptor held in position in your hand (lock
torque).
While taking the measurement,
rotate the reel table
(take up reel assembly) on the take up side with your
hand so that the reel sensor does not respond.
3)
After switching to FF mode, wait for at least 10 seconds
and then measure the torque value of the reel table on
the take up side. It should be at least 600g/cm (lock
torque).
4)
After switching to PLAY mode, wait for at least 10
seconds and then measure the torque value of the reel
table on the take up side. It should be between 80 and
140g/cm (lock torque).
Torque gauge
~
Torque gauge adaptor
Reet table on
supply side
Reel table on
take up side
Fig.4-1-1
5-26
Make holes with
roughly the same
diameter as the reels.
Dummy
cassette
tape
\
Stick black vinyl
tape over the tape
sensor holes.
Fig.4-1-2
4-2. ADJUSTING THE BT LEVER
ASSEMBLY POSITION AND CHECKING
THE BACK TENSION TORQUE IN PLAY
MODE
4-2-1. BT LEVER POLE POSITION ADJUSTMENT
(See Fig.4-2-1)
1) Without loading a cassette tape, put the mechanism
into PLAY mode (turn the power switch OFF).
2)
Adjust
point@® on
the band
brake
assembly
by
rotating it so that the tip of the BT lever assembly is
aligned with the line on the left side of the mechanism
chassis.
3)
Refer to section 4-2-2 and check that the back tension
torque is between 30 and 50g/cm.
Align the end of the BT lever
assembly with this line.
Fig.4-2-1
4-2-2. CHECKING THE BACK TENSION TORQUE
PLAY MODE
1)
Mount the cassette torque meter VHT-063S
and
switch to PLAY mode.
2)
Check that the back tension torque is between 30 and
50g/cm.
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