Hitachi D-E99 Service Manual page 21

D-E99
Pin
Pin Symbol Function
No.
21 FF SOL.
Pin@ Pin@
Elapsed timer
22
REWIND SOL.
Potential
Potential
Tape counter
0
0 -
-
0
1
Count subtracted
-
1 0 Count added
-
1
1 Count added Count added
• Test program execution instruction input pin.
Test program is executed when pin
@
is set to Hi potential input with power ON reset.
23
50/60
• Elapsed time indication timer drive power frequency pulse input pin.
Inputs power frequency pulse within 2 sec. after power is ON and resetting is complete
and executes the 50/60 Hz frequency automatic discrimination.
Power ON reset
,,
signal
II
Power frequency pulse
LJlflflr_n_n_
input signal
-
Within
2 sec
i . -
Input pulses
10~30
k::'
Indicator gone off
> <
Indicator lit
---i
Power frequency
automatic~
discrimination
Discrimination
complete
24 COUNTER
• Tape counter indication reset (zero clear) input pin.
CLEAR
Inputs Lo potential normally and inputs Hi potential during button operation.
25 REEL PULSE
• Input pin of tape end detection Hall element pulse output signal. Becomes the reference
signal of the addition/subtraction count of the tape counter.
26 RESET ·Reset pin. This pin is set to Lo potential when power is supplied and initial resetting is
performed at the retrailing edge of the pulse.
27 V
GG
·Power pin. Connected to GND.
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