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CIRCUIT
DESCRIPTION
e.
*
f.
BACKSPACE
CONTROL
CIRCUIT
When pin9 (PEO) of IC3 goes to low, the Play Solenoid
(SL1 ) functions.
At the same time, Q19 turns on, as does
Q18.
When Q18 turns on, voltage
corresponding
to the
position
of the Backspace
Control
(VR3) is supplied
to
C42.
When
the
Foot Control
Play
Button
is released,
pin9
(PEO) of IC3 goes to high (approx. 1.2V) and the Play So-
lenoid (SL1 ) is released.
At the same time, pinl 1 (PE2)
of IC3 goes to low and Q15 turns on.
As a result, Q14
turns on as long as the voltage at C42 is discharged,
dur-
ing which time the Rewind Solenoid
(SL2) operates.
REMOTE
CONTROL
CIRCUIT
By pressing
the Hand Control or Foot Control switch, the
input voltage
at pin8 of IC5 and the voltages
at pinsl,
2,
3, 4 and 6 of IC5 become as shown in the following
chart.
b
Function
Pin 8
Pin 6
Pin 4
Pin 3
Pin 2
Pin 1
No operation
1300 mV
H
H
H
H
H
Start lPlay
900 mV
L
H
H
H
H
Backspace
700 mV
L
L
H
H
H
Cue
500 mV
L
L
L
H
H
Dictate
300 mV
L
L
L
L
H
Back
Ov
L
L
L
L
L
PJplJ
(IC3)
picks Up the output from IC5 and the voltages
at pinsl,
2, 3, 4 and 6 and performs
the appropriate
operation (i.e., Start/Play, Backspace, Cue Tone Production,
Dictate and Playback).
-1o-
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