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3-1. SYSTEM CONTROL-VIDEO BLOCK INTERFACE (MA BOARD IC501)
Signal
Pin No.
I/O
V·PB
IC501
O
RF SW P (SW25)
IC501
O
Q VD/V MUTE
IC501
O
NA·SP
IC501
O
LP
IC501
O
REC·P
IC501
O
REC
IC501
O
V SYNC
IC501
I
OSD MUTE
IC501
O
CTL REC
IC501
O
NTSC
IC501
O
JOG
IC501
O
CRC SETTEI
IC501
O
*1. 25Hz 50% duty pulse synchronizing with drum rotation.
*2. Normally "L" . "H" when the video signal is not detected.
*3. V period "H" pulse.
*4. "L" in the SP mode. Selected according to the recording mode.
*5. Selected according to the tape recording mode.
Mode
SP
LP
EP
Signal
SP
L
H
H
LP
L
L
H
TAPE
STOP
FF
REW
THREADING UNTHREADING
H
H
H
H
*1
*1
*1
*1
L
L
L
L
*4
*4
*4
*4
*8
*8
*8
*8
L
L
L
L
L
L
L
L
*6
*6
*6
*6
*7
*7
*7
*7
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
TAPE
PB ·
PB
PAUSE
SLOW
H
L
L
L
*1
*1
*1
*1
L
*2
*3
*3
*4
*5
*5
*5
*8
*5
*5
*5
L
L
L
L
L
L
L
L
*6
*6
*6
*6
*7
*7
*7
*7
L
L
L
L
L
L
L
L
L
L
H
H
L
L
L
L
*6. Composite sync signal (positive).
*7. "H" when menu screen or gray back screen.
*8. Selected by REC mode, "L" in the SP mode.
*9. "H" while APC is set.
PICTURE SEARCH
X2
CUE
REVIEW
REC
L
L
L
H
*1
*1
*1
*1
*3
*3
*3
L
*5
*5
*5
*4
*5
*5
*5
*8
L
L
L
L
L
L
L
H
*6
*6
*6
*6
*7
*7
*7
*7
L
L
L
H
L
L
L
L
H
H
H
L
L
L
L
*9
REC ·
PAUSE
H
*1
L
*4
*8
H
H
*6
*7
L
L
L
*9
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