Sharp VL-MC500U Service Manual download pdf (Page 16)

VL-MC500U/K

(1) Check that the tape is not distorted between the Tu guide and

pinch in the PB mode and the V/SR mode.

-If crease is found, make an adjustment in the range of ±180°.

-After adjustment apply Screw Lock.

(1) Confirm that the envelope waveform peaks in V/SR mode are

uniform.

(2) If they are not uniform, fine-adjust the guide roller and the Tu

guide.

(1) Loosen the guide roller lock screw, then tighten loosely so that

the roller turns easily.

(2) Replay an alignment tape, and adjust the Sup, Tu guide roller

so that the envelope sides of entrance and exit are flat.

(3) Perform ± 1/4 shift, then, as in the above case, adjust until the

envelope becomes flat.

* If running is difficult for the entrance changed, turn the T roller

to counterclockwise 180°. (refer to Fig. 1)

8-4. Running rough adjustment

(With cassette controller)

(1) Perform ± 1/4 shift, then if the envelope wave's ratio of MAX.

to MIN. are 60% or less, adjust again the height of guide roller.

(Refer to Fig. 2)

(2) Finally adjust the lock screw of Sup and Tu guide roller.

(3) Once perform unloading and then loading to set the PB mode,

and make sure that the envelope waveform does not change.

1) Adjustment of Sup and Tu guide roller height

8-5. Final running adjustment

(With cassette controller)

2) Adjustment of playback SWP

(1) Playback the alignment tape for switch point adjustment.

(2) Perform SWP automatic adjustment with adjustment remote control.

Fig. 2

* When replacing the mechanism and drum, adjust the phase and equalizer using the adjustment remote control.

(Refer to "10. ADJUSTING THE ELECTRICAL CIRCUITS".)

1) Su, Tu guide roller height adjustment

Entrance side

Exit side

Normal

Turn to 180°

T roller

Fig. 1

2) Check of V/SR envelope wave form

•

Adjust so that A B.

3) Check of tape wrinkles

Tu guide

Deformation

Wrinkles

Pinch roller

4) Check the rising time of the envelope wave form

(1) Check the rising time of the envelope when switching from V/SR mode to PB mode. (Within 5 sec)

(2) Check the rising time of the envelope when switching from STOP mode to PB mode. (Within 5 sec)

±1/4 shift ±1/4 shift

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Sharp VL-MC500U Service Manual Page 16

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