Sharp 37VT-26H Service Manual page 31

15. 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 and
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 out.
Azimuth screw
Spring
2
Figure 1-23.
• Replacement
1. Solder the removed PWB to the new head assembly.
2. Adjust the height from the A/C head plate (lower
surface) to the A/C head base to 10.8mm with slide
calipers. (3 places of azimuth screw section, tilt
screw section and height screw section)(See the
figure below.)
New A/C head ass'y
∗
Never touch the head
10.8mm
Figure 1-24.
3
Tilt screw
Height screw
1
Solder
A/C head PWB
A/C head base
10.8mm
3. Align the left end of gear of A/C head plate with the
punched mark of chassis, tentatively tighten the
screws 1 and 2 so as to ensure smooth motion of
A/C head plate. Tentative tightening torque must be
0.15 to 0.20 N·m (1.5 to 2.0kgf·cm).
1
2
Figure 1-25.
Notes:
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 18..)
31
37VT-26H(GY)
3
Height screw
Left end of A/C head plate gear
Punched line mark on chassis