SHARP VC-A415U
Manual de Servicio

VC-A415U/H815U VC-H817U/H818U
Note: Whenever replacing the reel disk, perform the height checking and adjustment.
Master plane Reel disk height adjusting jig

Notes: 1. Hold the torque gauge by hand so that it is not moved. 2. Do not keep the reel disk in lock state. Do not allow longtime measurement.

10 ± 0.2mm

Reel disk
A

Mechanism chassis

4-7. CHECKING AND ADJUSTMENT OF TAKEUP TORQUE IN REWIND MODE
� Remove the cassette housing control assembly. � After short-circuiting TP803 and TP802 provided at operation PWB, plug in the power cord. � Setting 1. Set a torque gauge to zero on the scale. Place it on the supply reel disk. 2. Press the rewind button. 3. To calculate the remaining capacity, slowly rotate the take-up reel disk, and then shift it into the rewind mode. � Checking 1. Turn the torque gauge slowly (one rotation every 2 to 3 seconds) by hand in the CCW direction. 2. Make sure that the indication of torque gauge is not less than 30mN·m (306gf·cm).
Torque gauge

B

Reel disk

Figure 4-7.

4-6. CHECKING AND ADJUSTMENT OF TAKEUP TORQUE IN FAST FORWARD MODE
� Remove the cassette housing control assembly. � After short-circuiting TP803 and TP802 provided at operation PWB, plug in the power cord. � Setting 1. Set a torque gauge to zero on the scale. Place it on the take-up reel disk. 2. Press the FF button. 3. To calculate the remaining capacity of the play back mode, slowly rotate the supply reel disk, and then shift it into the forward mode. � Checking 1. Turn the torque gauge slowly (one rotation every 2 to 3 seconds) by hand in the CW direction. 2. Make sure that the indication of torque gauge is not less than 30mN·m (306gf·cm).
Torque gauge

30mN·m (306gf·cm) or more CCW

The gauge is held at its maximum value. (Red mark)

Supply reel disk 30mN·m (306gf·cm) or more CW

The gauge is held at its maximum value. (Red mark)

Idler ass'y

Figure 4-9. � Adjustment 1. If the rewind winding-up torque is less than the specified value, clean the capstan D.D. motor pulley, drive belt, and limiter pulley with cleaning liquid, rewind again, and check the winding-up torque. 2. If the winding-up torque is still out of range, replace the drive belt.

Idler ass'y

Figure 4-8. � Adjustment 1. If the FF winding-up torque is less than the specified value, clean the capstan D.D. motor pulley, drive belt, and limiter pulley with cleaning liquid, and check again. 2. If the torque is less than the set value, replace the reel belt.

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