Sharp VT-3448X Service Manual page 36

REPLACEMENT OF A/C (Audio/Control) HEAD
Remove the cassette housing control assembly.
Place the unit in the unloading mode, and unplug the power
cord.
Removal
Remove the screw @@o@@.
Unsolder the A/C head PWB soldered to the A/C head
assembly.
Notes:
After replacement, be sure to perform the adjustment of the
tape drive train (see page 40). Under any circumstances,
avoid touching the head. Clean the head, if touched with
your finger, with alcohol.
Take care that the springs do not fly off when removing the
screws @@Q.
B
Figure l-23.
Replacement
Solder the removed A/C head PWB onto a new A/C head
assembly.
Using the slide calipers, set 10.3 mm for the height of the AJ
C head arm (bottom surface) to the A/C head plate (screw
area).
(See the figure below.)
New A/C head ass'y
Figure I-24.
mark on the chassis, and temporarily tighten the screws @
and @ to allow the A/C head arm to smoothly move.
(Reference: Temporary tightening torque: 0.2 N.m as
preferable)
Note:
Take care that he adjustment or height of the A/C head may vary
during final tightening if the screws @ or @ is temporarily
tightened to be loose.
[A/C head height rough adjustment]
l
Weight to prevent
Solder
A/C head PWB
l
Adjust the screw 0 visually so that the control head is visible
,
Figure l-25.
Setting
Figure I-26.
mode.
screw @ until the tape is in the position shown below.
Figure l-27.
Adjustment
Mechanism chassis