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3-3. SYSTEM CONTROL-MECHANISM BLOCK INTERFACE (MA BOARD IC501)
CASSETTE CASSETTE
Signal
Pin No.
I/O EJECTEDLOADING UNLOADING THREADING UNTHREADING STOP
CAM LOAD
IC501
O
L
CAM UNLOAD IC501
O
L
CAM 12V
IC501
O
MODE 1
IC501
I
H
MODE 2
IC501
I
L
MODE 3
IC501
I
L
MODE 4
IC501
I
L
REC PRF
IC501
I
L
T REEL FG
IC501
I
H/L
S REEL FG
IC501
I
H/L
O
END LED
IC501
*4
(O.D)
O
CAP TRQ 1
IC501
(O.D)
O
CAP TRQ 2
IC501
(O.D)
O
CAP TRQ 3
IC501
(O.D)
O
CAP STOP
IC501
L
(O.D)
CAP RVS
IC501
O
H
CAP DA
IC501
O
T SENS
IC501
I
*4
S SENS
IC501
I
*4
*1. Uncertainty
*2. "L" when the erasing protection tab is bent,"H" when not bent.
*3. Pulse of period proportionate to reel rotationg speed.
*4. Approx. 2 msec. period "H" pulse.
*5. Pulse in tape running.
*6. "L" only in tape running and when CAP RVS is "H".
*7. Nomally "L". 2 msec. poriod "H" pulse when tape top or tape end is detected.
TAPE
TAPE
H
L
H
L
L
L
H
L
H
L
H
L
H
L
L
L
*1
*1
H
L
L
*1
*1
L
L
L
*1
*1
H
H
H
*1
*1
H
*2
*2
*2
*2
*2
H/L
H/L
H/L
H/L
H/L
H/L
H/L
*3
*3
H/L
*4
*4
*4
*4
*4
L
L
H
H
L
L
H
H/L
*4
*4
*7
*7
*7
*4
*4
*7
*7
*7
PB ·
FF
REW
PB
PAUSE
SLOW
L
L
L
L
L
L
L
L
L
L
H
H
H
H
H
L
L
H
H
H
H
H
L
H
H
L
L
L
L
L
*2
*2
*2
*2
*2
*3
*3
*3
H/L
*3
*3
*3
*3
H/L
*3
*4
*4
*4
*4
*4
*1
L
*1
H
H
*1
H
H
H
L
*5
L
H
L
L
L/*5
*7
*7
*7
*7
*7
*7
*7
*7
*7
*7
PICTURE SEARCH
REC ·
X2
CUE
REVIEW
REC
PAUSE
L
L
L
L
L
L
L
L
L
L
H
H
L
H
H
H
H
H
H
H
L
L
H
L
H
L
L
L
L
L
*2
*2
*2
*2
*2
*3
*3
*3
*3
H/L
*3
*3
*3
*3
H/L
*4
*4
*4
*4
*4
L
H
H
H
H
H
H
L
L
L
H
L
L
*7
*7
*7
*7
*7
*7
*7
*7
*7
*7
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