Sharp DV-NC70U Service Manual - Page 28

DV-NC70U/C DV-NC72U 8-17 REPLACEMENT OF A/C (AUDIO/CONTROL) HEAD 1. In eject position unplug the power cord. • Removal 1. Take out FFC holder from main chassis. (Push 3 hooking point and pull-up the holder). 2. Remove the screws 123, Tilt screw. 3. Unsolder the PWB fitted to the A/C head. AC Head FFC Holder 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. 3 A/C head screw 3. Align the left end of gear of A/C head arm with the punched mark of chassis, tentatively tighten the screws 1 so as to ensure smooth motion of A/C head arm. Tightening torque must be 0.45 ± 0.05N·m (4.5 ± 0.5kgf·cm). Height screw 1 Left end of A/C head arm gear Punched line mark on chassis Figure 8-24. Azimuth spring *Derection designation. (The bottom part is big.) 2 Azimuth adj. screw A/C head PWB ass'y (with A/E) Tilt screw A/C head PWB Notes: 1. If the screw 1 is 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 8-19.) Height adj. screw 1 A/C head plate Height Adj. spring Figure 8-22. • 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.) New A/C head ass'y A/C head PWB Solder A/C head plate A/C head FFC *Fit the groove of FFC to the boss of the holder. A/C FFC holder 10.8mm Figure 8-23. 28