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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 incan-
descent 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 dial gauge
(VHJ-0004) 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 sec-
onds 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 55
and 110g/cm (lock torque).
Torque dial gauge
(VHJ-0004)
Reel table on
supply side
5) After switching to REVIEW mode, wait for at least 10
seconds and then measure the torque value of the
reel table on the supply side. It should be between 100
and 210g/cm (lock torque).
Stick black vinyl
tape over the tape
sensor holes.
4-2. ADJUSTING THE BT LEVER
4-2-1. BT LEVER POLE POSITION ADJUSTMENT
1) Without loading a cassette tape, put the mechanism
into PLAY mode (turn the power switch OFF).
2) Adjust point
rotating it so that the tip of the BT lever assembly is
aligned with the line on the right side of the mecha-
nism chassis. The mechanism should be in EJECT
mode when adjusting the BT Lever assembly posi-
tion.
3) Refer to section 4-2-2 and check that the back tension
torque is between 25 and 50g/cm.
Reel table on
take up side
4-2-2.CHECKING THE BACK TENSION TORQUE
Fig.4-1-1
1) Mount the cassette torque meter (VHJ-0016) and
switch to PLAY mode.
2) Check that the back tension torque is between 25 and
50g/cm.
–27–
Dummy cassette
tape
ASSEMBLY POSITION AND CHECK-
ING THE BACK TENSION TORQUE IN
PLAY MODE
(See Fig.4-2-1)
on the band brake assembly by
PLAY MODE
Make holes with
roughly the same
diameter as the reels.
Fig.4-1-2
Fig.4-2-1
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