Checking And Adjusting Of Tension Pole Position During Rec (Pb); Checking And Adjusting Of Rec (Pb) Back Tension Torque; Checking Of S Reel Table Unloaded Torque - Sharp VL-Z400H-T Service Manual

6-4. Checking and adjusting of tension pole position during
REC (PB)
3 to 4V DC, Cassette controller assembly not installed (Mechanism only)
(1) Checking
Check that the tension pole is located in the prescribed position as shown in Fig.4
at the start of a 60-minute tape.
If the tension pole is not located in the prescribed position, take out the tape and
make adjustment according to the procedure shown below.
(2) Adjusting (See Fig.4.)
1. Select the PB mode without setting a tape.
2. Slightly loosen the screw 1 (to such an extent that the T band adjustment base
2 can be moved.)
3. If the tension pole is dislocated inward from the prescribed position, shift the
T band adjustment base 2 in the direction shown by Arrow (A). If it is dislocated
outward from the prescribed position, shift the T band adjustment base 2 in the
direction shown by Arrow (B). Then fix the T band adjustment base 2 with the
screw 1.
(For how much the T band adjustment base is to be shifted, refer to Fig.4.)
4. Check the tension pole position as described in "(1) Checking" above.
5. If out of position, make readjustment.
6-5. Checking and adjusting of REC (PB) back tension
torque
AC adapter used, Cassette controller assembly installed
(1) Checking
Set the torque cassette (SD-1015). In the SP record mode (or in the PB mode if
signals have been SP-recorded on the tape), check that the feed-side torque is
within the following spec.
<Spec>(If there is a torque ripple, read the center value.)
0.4 ± 0.05 mN·m
(2) Adjusting (See Fig.5.)
If the measured back tension torque is out of spec, make adjustment according
to the following procedure.
1. Slightly loosen the screw 3.
2. If the back tension is higher, shift the T-SPR adjustment ANG in the direction
shown by Arrow (D). If it is lower, shift the T-SPR adjustment ANG in the
direction shown by Arrow (C).
3. After adjusting the back tension torque, fix the T-SPR adjustment ANG with the
screw 3. Apply loctite adhesive to screw 3.
<Reference>
Screw tightening torque: 0.04 N·m

6-6. Checking of S reel table unloaded torque

3 to 4V DC, Cassette controller assembly not installed (Mechanism only)
(1) Remove the cassette controller assembly, apply 3 to 4V DC to the loading motor
and select the L start mode. (See 8-1.)
(2) Move the swing arm to the Tu reel table side. At this time, take care not to damage
the gears etc. (See Fig.6.)
(3) Set the reel hub for back tension measurement on the S reel table.
(4) Using the dial tension gauge, pull the thread of the reel hub in the direction shown
by Arrow A and check that the tension is within spec.
<Spec>
(If the tension fluctuates, read the center value.)
10mN or less
Apply loctite
adhesive.
Fig.6 How to measure the S reel table unloaded torque
11
VL-Z400S-T/H-T
VL-Z500S-S/H-S/E-T/E-S
Tension pole position
(Based on drum base outside shape)
0±0.3
Drum base
T pole
T band adjustment
base 2
Screw 1
Fig.4 Adjusting of position (tape exists)
Screw 3
T-SPR adjustment ANG4
Fig.5 Checking (tape exists)
Move the swing arm to
A
the Tu reel table side.