Sharp vc-ga56z Service Manual

Contents

16VC-GA56ZVC-GH96Z4-10. CHECKING THE VIDEO SEARCHREWIND BACK TENSION• Remove the cassette housing control assembly.• After short-circuiting TP803 and TP802 provided atoperation PWB, plug in the power cord.• Checking1. After pressing the play button, press the rewind button,and set the video search rewind mode.2. Place the torque gauge on the take-up reel disk, andturn it counterclockwise very slowly (one rotation every2 to 3 seconds) and check that the torque is within theset value 3.4 ± 1.5mN⋅m (35 ± 15gf⋅cm).Torque gaugeCCWTake-up reel diskFigure 4-12.Notes:Set the torque gauge securely on the take-up reel disk.If it is not secure, the measurement will be incorrect.4-11. CHECKING THE PINCH ROLLERPRESSURE• Remove the cassette housing control assembly.• After short-circuiting TP803 and TP802 provided atoperation PWB, plug in the power cord.• CheckingPress the play button to set the playback mode.1. Detach the pinch roller from the capstan shaft.Do not separate excessively. Or the pinch lever andpinch double action lever may disengage.2. Engage the tension gauge adapter with the pinch rollershaft, and pull in the arrow direction.3. Gradually return the pinch roller, and measure thepulling force when the pinch roller contacts the capstanshaft.4. Make sure that the measured value is within setting 9.0N to 11.8 N (900 to 1,200gf).4-12. CHECKING AND ADJUSTMENT OFTENSION POLE POSITION• Remove the cassette housing control assembly.• After short-circuiting TP803 and TP802 provided atoperation PWB, plug in the power cord.• Setting1. Turn off the power switch.2. Open the cassette tape (T-120), and fix with tape.3. Set the cassette tape in loading state.4. Put the weight (500g) on the cassette tape.5. Turn on the power switch.6. Make the adjustment with the beginning of a T-120tape.Pinch rollerCapstan shaftTension gauge900 - 1,200gfTension gauge adapterFigure 4-13.500g(T-120)Weight to preventfloat (500g)Figure 4-14.• Checking1. Set a cassette tape, push the REC button to place theunit in the SP record mode. Now check the tension poleposition.