Adjustment Of Running System - Sharp VL-Z7E-A Service Manual

7. ADJUSTMENT OF RUNNING SYSTEM

7-1. Outline of adjustment of running system
(Replacement parts)
· Tu guide and arm
· Slide chassis
(Replacement parts other
than above)
· Pole base
· Guide roller
Presetting of height not
· Drum assembly
necessary
· Cap motor, etc.
7-2. Adjustment of height of running system
· After replacement of the Tu guide and slide chassis, adjust the height of the Tu guide using the height adjustment jig.
· If wrinkles are found in the tape, turn the Tu guide to remove them.
(For further details, refer to "Coarse adjustment of running system".)
· After adjusting the Tu guide height, apply screw loctite at the tip of the shaft.
Master plane
7-3. Preparations for adjustment of running system
Measuring instrument and Jig : Oscilloscope, Adjustment remote control, Height adjustment screwdriver, Alignment tapes (for
<Method and description>
(1) Clean the surfaces that come in contact with the tape. (Clean
well the drum surface and the lower drum helical surface in
particular.)
(2) Install the cassette controller.
(3) Connect the oscilloscope to each TP of the joint circuit board.
(4) Turn ON the power of the AC adapter.
(5) Select TEST mode T-05 with the adjustment remote control.
(6) Play back the alignment tape for running system adjustment
and check that the tape is moving in the SP mode.
(7) While observing the PB envelope on the oscilloscope, adjust
the running system so that the envelope becomes flat in
states of [+1/4 shift] and [-1/4 shift].
(Each time the PB key is pressed, the shift amount changes
as shown below.)
+1/4 shift - Normal - -1/4 shift - Normal
Readjustment of height
Installation of
cassette controller
View A
Tu guide
Apply it in this direction.
Height
adjustment jig
adjustment of running system and adjustment of SW point), Master plane, Height adjustment jig
Preparations for
Coarse adjustment
adjustment of
of Running system
Running system
Adjusting
Adjusting
procedure(7-4)
procedure(7-3)
Height
adjustment jig
View A
Align the top face of the lower flange of the Tu
guide with the bottom edge of the height
adjustment jig.
After adjusting the height, turn the head
clockwise 180 degrees.
Sup guide roller
S guide
Drum
Tension pole
13
VL-Z7S/E/Z7E-A/Z7E-W
VL-Z8H
Final adjustment
of Running system
Adjusting
procedure(7-5)
Bottom edge
Master plane
Tu guide roller
Tu guide
Capstan shaft
Pinch roller
Reel