Sharp VC-H992U, Service Manual

Page: 20 / 82

20
VC-H992U
VC-H992U(A)
Figure 4-24.
• Replacement
1. Solder the removed PWB to the new head assembly.
2. Adjust the height from the A/C head arm (lower surface)
to the A/C head plate to 10.8mm with slide calipers. (3
places of azimuth screw section, tilt screw section and A/
C head front section) (See the figure below.)
3. Align the left end of gear of A/C head arm with the
punched mark of chassis, tentatively tighten the screws
1
and
2
so as to ensure smooth motion of A/C head
arm. Tentative tightening torque must be 0.15 to 0.20
N·m (1.5 to 2.0kgf·cm).
REPLACEMENT OF A/C (Audio/Control) HEAD
1. Remove the cassette housing control assembly.
2. In unloading state unplug the power cord.
• Removal
1. Remove the screws
123
, Azimuth screw, Tilt screw.
2. Unsolder the PWB fitted to the A/C head.
Notes:
1. When replacing, never touch the head. If you touched,
clean with the cleaning liquid.
2. When removing the screw
3
, take care so that the
spring may spring out.
New A/C head ass'y
A/C head PWB
2
Spring
1
Solder
Never touch the head
10.8mm 10.8mm
Azimuth screw
Height screw
Tilt screw
A/C head plate
Figure 4-25.
Note:
1. If the screws
1
and
2
are tighten tentatively too loose,
the azimuth and height of A/C head may change when
they are finally tightened. Therefore care must be taken.
2. After completion of A/C head be sure to adjust tape
running. (Execute the running adjustment by the method
described in Page 22, 23.)
Punched line mark on chassis
Left end of A/C head arm gear
1
2
3
Height screw
Figure 4-23.
3