Coarse Adjustment Of Running System; Adjustment Of Height Of Su And Tu Guide Rollers; Checking Of V/Sr Envelope Waveform; Checking For Wrinkles In Tape - Sharp VL-Z400H-T Service Manual

VL-Z400S-T/H-T
VL-Z500S-S/H-S/E-T/E-S

7-4. Coarse adjustment of running system

(Cassette controller installed)

1. Adjustment of height of Su and Tu guide rollers

<Method and description>
(1) Play back the alignment tape for running system
adjustment and make adjustment so that the inlet
and outlet sides of the envelope become flat.
(2) In states of [+1/4 shift] and [-1/4 shift], make
adjustment in the same manner as described in (1)
above.

2. Checking of V/SR envelope waveform

<Method and description>
(1) In the V/SR mode, check that the envelope waveform
is shaped uniformly.
(2) If the envelope waveform is not shaped uniformly,
fine-adjust the guide roller and Tu guide.

3. Checking for wrinkles in tape

<Method and description>
(1) In the PB mode and V/SR mode, check the tape for
distortion between the Tu guide and the pinch roller.
- If wrinkles are found, make adjustment within a
range of ±180 degrees.
- After making adjustment, apply loctite adhesive to
the tip of the shaft.
4. Checking of envelope waveform rise time
<Method and description>
(1) Check the envelope waveform rise time in switching from the V/SR mode to the PB mode. - 5 seconds or less
(2) Check the envelope waveform rise time in switching from the STOP mode to the PB mode. - 5 seconds or less
7-5. Final adjustment of running system
(Cassette controller installed)
1. Adjustment of height of Sup and Tu guide rollers
<Method and description>
(1) If the ratio of MIN to MAN of the envelope waveform is less
than 60%, adjust the height of the guide roller again. (See
Fig.1.)
(2) Perform unloading and then loading again, select the PB
mode and check that there are no significant changes in
the envelope waveform.
2. Adjustment of PB SWP
<Method and description>
(1) Play back the alignment tape for SW point adjustment.
(2) Using the adjustment remote control, make SWP automatic adjustment.
(3) Check that an OK is given as a result of self-judgment. In the case of a NG, adjust the GR height again.
* After replacement of the mechanism and drum, adjust the phase and equalizer using the adjustment remote control.
(Refer to "9. METHOD OF ADJUSTING THE ELECTRICAL CIRCUITS".)
Inlet side Outlet side
NG
±1/4 shift
Normal
A
Make adjustment so that A B.
Wrinkle
Pinch roller
Fig.1
14
NG
±1/4 shift
B
Tu guide
Distortion
Distortion