Sharp SG-315H Service Manual page 2

—_ ©
CABINET DISASSEMBLY
. Remove the turntable by pulling upward.
. Lift up the player board at the lefthand and slide the player board to the left.
. Remove four (4) slide volume knobs and tuning knob.
. Remove the cabinet bottom retaining screw.
Remove the screw retaining the control panel.
. Lift up the control panel at this side and pull out the panel.
retaining the power transformer bracket.
DIAL CORD STRINGING
DIAL POINTER
TUNING SHAFT
2.5TURN
Figure 1
CHECK AND ADJUSTMENT
= TAKE-UP TORQUE IN FAST FORWARD MODE (Refer to Figure 2)
1. Place a test reel on a take-up reel spindle.
. Put a tension gauge on the test reel.
. Set the unit in fast forward mode by depressing the FAST FORWARD button.
. Turn the gauge slowly to counterclockwise direction and read the gauge.
. The reading on the tension gauge should be 60 — 90gr.
nr WD
m= REWIND TORQUE IN REWIND MODE (Refer to Figure 2)
1. Place a test reel on a supply reel spindle.
2. Put a tension gauge on the test reel.
3. Set the unit in rewind mode.
4. Turn the gauge slowly to clockwise direction and read the gauge.
5. The reading on the tension gauge should be 55 — 90gr.
TAKE-UP TORQUE IN PLAY MODE (Refer to Figure 2)
1. Do the same steps | and 2 in "TAKE-UP TORQUE IN FAST FORWARD MODE".
2. Set the unit in playback mode by depressing the PLAY button.
3. Check the take-up torque.
4. The reading on the tension gauge should be 30 — 60gr.
PINCH ROLLER PRESSURE (Refer to Figure 3)
1. Set the unit in playback mode.
2. Hook the tension gauge at the pinch roller shaft.
3. Read the gauge when the pinch roller separates from the capstan about 0.5mm distance.
4. The pinch roller pressure should be 400 — S40gr.
TURN TABLE
20¢ (25/32'')
MEASURING
REEL
TENSION
GAUGE
Figure 2