Sharp SG-315H - Tape Speed and Flywheel Clearance Checks

@ FLYWHEEL THRUST CLEARANCE ADJUSTMENT (Refer to Figure 4)
Adjust the thrust gap about 0.1mm to 0.3mm by adjusting screw on the flywheel bracket. After finished adjustment,
apply a drop of lacquer on the screw.
ADJUSTMENT SCREW
0Mw—"=0MS ESS ee”
r
0.1mm
~ 0.3mm
FLYWHEEL
[2 )
1000A0)-——- SPRING
Figure 3 Figure 4
@ TAPE SPEED CHECK (Refer to Figure 5)
1. Connect an 4 ohm dummy load resistor to the speaker output socket (SO504 or SO505).
2. Connect a frequency counter across the 4 ohm resistor.
3. Place the unit in a horizontal position and playback the test tape (TEAC MTT-111, 250 PWB/mm —10 dB, 3 kHz).
4. Ensure that the frequency counter indicates within 3 kHz +75 Hz (2925 ~ 3075 Hz)
If the tape speed is not within this range, clean the belt, flywheel, capstan, pinch roller and the other running parts.
Check the torque of take-up turntable and pressure of the pinch roller. Neverthless good results can not be obtained,
replace the motor.
PLAYBACK
MODE
FREQUENCY
COUNTER
SPEAKER OUTPUT SOCKET (SO504 or SO505)
Figure 5