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Tracking
Force Dial
Counterweight
6-(6) Motor RPM Adjustments
2. Connector
an oscilloscope between TP-1 and GND on
the motor board as shown at right (Fig. 14)
@
33-1/3 PRM adjustment
Set SPEED
SW (SW4) to 33-1/3 RPM. then adjust the
'
coarse adjustment VR (VR1) on the moior board so that
=
the waveform on the oscilloscope has T = 20 msce.
@
45 RPM adjustment
.
:
Set SPEED SW (SW4) to 45 RPM, then adjust the coarse
vas!
adjustment VR (VR2) on the motor board so that the
waveform on the oscilloscope has T = 14.8 msec.
4. Finally, using the stroboscopic
pattern
(33-1/3 RPM)
"TP4
and the accessory stroboscopic pattern for 45 RPM, con-
firm whether the respective adjustrnents are performed
properly.
Waveform
Shaper
50Hz
+20
(at 33-1/3rpm)
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