o Arm Control lC lR3T03
The numbers on the left side indicates the terminal number
of the lR3T03.
1. Accelaration inPut
Except for the matching range of the lead-in detector
(E7 < I t0.6V | ), it will recognize the situation and control
the accelaration during automatic tonearm operation.
2. Accelaration output
rt 5l tz.szv t0.1v I . . . open (will not control the ac-
celaration within the match-
ing range)
er 2lrz.sv10.1v | . . . . E2=t3.95V
-3.95V: will accelarate toward the inside from rest'
+3.95V: will accelarate toward rest from the inside'
3. UP/DOWN selection of the arm lifter
When E9 is H, the control output for lifting the arm will be
made at E3 = -Vcc.
When E9 is L, the control output for lowering the arm will
be made at E3 = +Vcc.
4. Detection of the rest Position
E4< -2.64V will be recognized as the arm being at rest'
5. Detection of the END Position
When E5 2 Z.Aqv, it will be recognized to be within the
END detection range.
E5 > 2.64V when the stylus tip nears the last sections of
the sound groove.
6. End control
Whithin the END detection range of 5 (above), (E5 >
2.64V}, the arm will be returned by the END control when
E6 > 0.23V.
E5 > 0.23V when the stylus tip moves into the lead-out
groove and the arm moves fast.
7. Matching input
E7 < | 10.6V lwill be recognized as the match range for
I ead-i n .
8. Drive output
Connect to GND.
9. UP control output
When the lifter is in the UP position during automatic arm
operations or when the UP signal is sent by pressing the arm
lifter button, pin 9 will be at H level.
EgH + 4V
E9L: OV
10. DOWN time constant
To ensure that the arm is lowered completely before pro-
ceeding to the next movement, a resistor between pins 9
and 10 and a capacitor on pin 10 has a preset discharge
time constant which is somewhat longer than the time
required for the arm to be lowered. Thus, when pin 9
becomes L (EgL : 0V), and the fixed amount of time
elapses. the arm will be recognized to be DOWN as soon as
E10 < 2V.
11. ANT (Anti-skating) control
When E10 < 2V, then El1 = -4V will be the control
output needed for the anti-skating to be engaged.
When E10 2 ZV, then E11 = +4V will be the control
output needed for the anti-skating to be disengaged.
12. Negative power source
Supplies -5V.
14. SUB (substratum)
To prevent any interference from the inner elements of the
LSl, the substratum terminal is connected to the unregu-
lated side of the negative power source, since it has the
lowest electric potential.
15. GND
Standard zero electric potential is the GND.
17. Return control
When the stop comrr'and is given, or when the repeat is
disengaged and the END is detected (EO > 0.23V), a con-
trol signal output (E17H > 4V) is mqde to return the arm
to rest.
E17H > 4V
E17L: release
18. Horizontal drive control
When the arm is in resting position, or when the arm
reaches the lead-in position during automatic play, and
comes into the matching range (E7 ( 1 tO.Ov | ), a control
signal output (E18H = 4V) is made to stop the horizontal
motion of the arm.
19. Initialset
This is the preparation time setting ierminal when the
power source is turned on. The resistor in the LSI and the
outer capacitor will set the charge time constant and carry
out the initial set.
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