Sharp VL-MC500U Service Manual download pdf (Page 15)

VL-MC500U/K

8. TAPE RUNNING ADJUSTMENT

8-1. Adjustment locations

8-3. Preparation for tape running adjustment

Meters, jig… Oscilloscope, Adjustment remote control, Height adjustment screw driver, Alignment tape (for tape running

adjustment, for switch point adjustment), Master plane, Height adjustment jig.

(1) Clean the tape running surface (especially, adequately clean

the drum surface and the lower drum helicam surface).

(2) Attach the cassette controller.

(3) Connect an oscilloscope to each TP on the relay circuit board.

(4) Turn the AC adapter power ON.

(5) Using the adjustment remote control unit, put the system TEST

mode T-05.

(6) Replay the alignment tape for running adjustment, and make

sure that the tape is running in the SP mode.

(7) Check the oscilloscope playback envelope, then, at +1/4 shift

and -1/4 shift, check whether all of it is flat. If it is not, perform

the following adjustment so that it becomes flat.

(Each time you push the PLAY key, the shift will change;

+1/4 shift → Normal → -1/4 shift → Normal , in order.)

8-2. Running height adjustment

· After replacement of T roller or Tu guide adjust the height . (Adjust only the replaced parts.)

· After height adjustment do not turn the T roller. If crease is found on the tape of Tu guide, remove the crease by rotating.

(As for details refer to the “Running rough adjustment”.)

· After height adjustment of T roller or Tu guide, apply Screw lock to an end of shaft.

(After replacement of S guide apply Screw lock to same point, too.)

S guide

Reels

Tension roller

Drum

Tu guide roller

Sup guide roller

Pinch roller

Tu guide

Fit height the par on low edge fitting.

After setting adjustment jigs, turn T roller

counterclockwise to 315°.

Lower edge

fitting

Height setting

jig

Master plane

Running adjustm-

ent preparation

Adjustment

procedure 8-3

· T roller, arm

· Tu guide, arm

· Slide chassis

Adjust the height of only

replaced parts with the

adjusting jig.

Adjustment procedure 8-2

<Replacement parts other

than those shown above>

· S guide

· Pole base

· Guide roller

· Drum assembly

· Capstan motor, etc.

Height presetting is not

necessary.

Cassette controller

installation

Running rough

adjustment

Adjustment

procedure 8-4

Running final

adjustment

Adjustment

procedure 8-5

Tu guide

T roller

Height setting

jig

Height setting

jig

Master plane

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Sharp VL-MC500U Service Manual Page 15

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