Table of Contents
Advertisement
Available languages
Available languages
9.9 MOTOR OPERATION POINT ADJUSTMENT
1. Open the slide base as described in "Dummy
Play Mode Setting", and run the motor at 33-1/
3rpm.
2. Connect the buffer amplifier shown in Fig.9.14
to the 3P connector from the motor base plate,
and connect the output
to
a oscilloscope
(making the lead wire length less than 10cm to
reduce the effects of extraneous electrical noise).
3. With a waveform like that shown in Fig. 9.15 in
the synchroscope, vary the gain to adjust the
peak-to-peak distance in the sawtooth waveform
to five divisions.
4. Then adjust VRl to obtain an a:b ratio of 3:2 in
Frg. 9.15 (taking every precaution to eliminate
unwanted noise).
5. After
completing the 33-U3rpm
adjustment,
repeat the process for 45rpm. Always adjust the
33-U3rpm speed before the 45rpm speed. And
even if only the 33-U3 rpm speed initially needs
adjustment, also adjust the 45rpm speed after
the 33-1/3rpm adjustment. Adjust VR2 for
45rpm. After completing the 45rpm adjustment,
check the 33-1/3rpm speed.
Slide base cover
Fig. 9-13 Motor Operation Point Adjustment
F i g . 9 . 1 4 B u f f e r A m p l i f i e r
Motor
3P connect
I S m s e c ( 3 3 )
l 3 . 3 m s e c ( 4 5 )
Fig. 9.15 Adjustment Waveform
I il__ s",
t \
, lli
\ry
0 l
\l
I I
t o t
\
A I
\ \ -
q>-vR1
C-vnz
ewdriver
D
F i g . 9 . 1 6 A d j u s t m e n t P o i n t
? 7
Hide quick links:
Advertisement
Table of Contents
