Sharp DV-NC70U Service Manual - Page 24
Checking And Adjustment Of Take, Up Torque In Record/playback, Up Torque In Video Search Rewind
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DV-NC70U/C DV-NC72U Notes: 1. Hold the torque gauge by hand so that it is not moved. 2. Do not keep the reel disk in lock state. Do not allow long- time measurement. 8-10 CHECKING AND ADJUSTMENT OF TAKEUP TORQUE IN RECORD/PLAYBACK MODE • Remove the cassette housing control assembly. • After short-circuiting between TP803 and TP802 provided at operation PWB, plug in the power cord. • Turn off the power switch. • Open the cassette torque meter lid, and fix it with tape. • Load the cassette torque meter into the unit. • Put the weight (500g) on the cassette torque meter. • Turn on the power switch. • Press the picture record button, and set EP picture record mode (x3). Set value EP 6.9 +2.0 -2.5 mN⋅m (70 +20 -25 gf⋅cm) 8-11 CHECKING AND ADJUSTMENT OF TAKEUP TORQUE IN VIDEO SEARCH REWIND MODE • Remove the cassette housing control assembly. • After short-circuiting between TP803 and TP802 provided at operation PWB, plug in the power cord. • Setting Press the playback button and rewind button to set the video search rewinding mode. • Checking Place the torque gauge on the supply reel disk, and turn it counterclockwise very slowly (one rotation every 1 to 2 seconds) and check that the torque is within the set value 14.1 ± 3.5mN⋅m. (144 ± 35gf⋅cm) Torque gauge CCW H Cassette torque meter Figure 8-9. • Checking 1. Make sure that value is within the setting 6.9 +2.0 -2.5 mN·m (70+-2250 gf·cm). 2. The winding-up torque fluctuates due to variation of rotation torque of limiter pulley ass'y. Read the center value of fluctuation as setting. 3. Set the EP record mode (x3) and make sure that the winding-up torque is within setting. • Adjustment If the playback winding-up torque is not within the setting, replace the limiter pulley assembly. Note: When the torque cassette is set, put a weight (500g) to prevent rise. When the cassette torque meter is taken out. Turn off the power switch. Supply reel disk Figure 8-10. Note: Surely put the torque gauge on the reel disk to measure. If the torque gauge is raised, accurate measurement is impossible. • Adjustment If the rewinding playback winding-up torque is not within the setting, replace the limiter pulley assembly. Note: The winding-up torque fluctuates due to variation of rotation torque of supply reel disk. Read the center value of fluctuation as setting. 24