Sharp VIEWCAM VL-WD650U, Service Manual

Page: 15 / 133

VL-WD650U
15
<Method and description>
(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.
<Method and description>
(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.
<Method and description>
(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 counter clockwise 180
°
. (refer to Fig. 1)
8-4. Running rough adjustment
(With cassette controller)
<Method and description>
(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
<Method and description>
(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. ADJUSTMENT THE ELECTRICAL CIRCUIT".)
1) Su, Tu guide roller height adjustment
Entrance side Exit side
Normal
NG
NG
Turn to 180
°
T roller
Fig. 1
2) Check of V/SR envelope wave form
B A
•
•
Adjust so that A B.
3) Check of tape wrinkles
Tu guide
Deformation
Deformation
Wrinkles
Pinch roller
4) Check the rising time of the envelope wave form
<Method and description>
(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