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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