Hitachi D-E99 Service Manual page 18

Pin
Pin Symbol
Function
No.
•
25
IC MUTE
• IC muting control output pin.
26 DATA O(LSB)
• ATRS IC (HA12035) control output pins. The control data is composed of 4-bit signal
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and output during REC, REC-PAUSE and REC-HOLD.
29 DATA 3(MSB)
• Auto/memory rewind switch and timer switch position detection input pins. Input the
timer switch position detection signal for 3 sec. after power is supplied, to judge the mode.
Input pins
Criterion mode
® I ® ®
®
0
I
0
x x
Test program execution
0 0
DATA2
Timer recording
0 1
+
DATA3
1 0 Timer play
=
1
1 1 ••
30 REEL PULSE • Input pin of tape end detection Hall element pulse output. When the take-up reel disk
stops rotating, pulse input disappears and tape end is detected with pulse not input for
3 sec. or more during REC and PLAY, and for 1 sec. or more during REW and FF.
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• Tape count during the memory rewind function operation is done counting the input
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pulses.
---·--------.
31 ATRS
· ATRS mode input pin. Judged as ATRS mode with Lo potential input.
(
32
REC MUTE • Auto REC MUTE detection input/output pin. When Le potential is input by the REC-
MUTE button operation during outputting Hi potential (during REC or REC-PAUSE
mode), it is judged as auto REC MUTE mode and Lo potential is output for approx. 4 sec.
33 PAUSE
· PAUSE mode input pin. Judged as PAUSE mode with Lo potential input.
~---
34 REC • REC mode input pin. Judged as REC mode with Lo potential input.
I
-l
--
--
35
FIXED
· ATRS FIXED mode input pin. When Lo potential is input, it is judged as FIXED mode
and the REC control data output is changed over from the A TRS data to FIXED data.
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· When the Lo potential is input and it is judged as FIXED mode, Lo potential is output to
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light the FIXED indicator and makes ATRS indicator go off.
-----------~----
36
STOP
·~TOP
mode input pin. When Lo potential is input, it is judged as STOP mode.
- - - - -
-
37 FF
· FF mode input pin. When Lo potential is input, it is judged as FF mode.
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38
PLAY
• PLAY mode input pin. When Lo potential is input, it is judged as PLAY mode.
• When the timer record or play is set within 3 sec. after power is supplied, Lo potential is
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output after approx. 3 sec. Outputs Lo potential with approx. 80 ms width simultaneously
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with the play operation start in the auto rewind play mode. This Lo potential is the one
action control signal when the unit is combined with the system component stereo.
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-
----------~----
39
REW
· REW mode input pin. When Lo potential is input, it is judged as REW mode.
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