System Control-Video/Rp Block Interface (Ma-314 Board Ic161); System Control-Servo Peripheral Circuit Interface (Ma-314 Board Ic161) - Sony SLV-E177EG Service Manual

5-1. SYSTEM CONTROL – VIDEO/RP BLOCK INTERFACE (MA-314 BOARD IC161)
Signal Pin No. I/O
MA-314
RF SWP O
IC161!•
MA-314
QVD O
IC161!£
MA-314
REC P O
IC161$ª
MA-314
C SYNC I
IC161*¢
∗1. Synchronized with drum rotation. 25 Hz 50% duty pulse.
∗2. Normally "L". "H" when videl signal is not generated.
∗3. Composite sync signal (positive).
5-2. SYSTEM CONTROL – SERVO PERIPHERAL CIRCUIT INTERFACE (MA-314 BOARD IC161)
Signal Pin No. I/O
MA-314
CTL IN+ O
IC161(™
MA-314
DRM PG I
IC161*•
MA-314
DRM FG I
IC161*¶
MA-314
CAP FG I
IC161*∞
MA-314
CAP RVS O
IC161!§
MA-314
CAP ERR O
IC161&¶
MA-314
DRM ERR O
IC161&•
∗1. 25 Hz pulse.
∗2. Pulse of period in proportion to tape speed.
∗3. 25 Hz "H" pulse.
∗4. 300 Hz pulse.
STOP/
TAPE TAPE
FF/ PB
LOADING UNLOADING
REW
∗1 ∗1 ∗1 ∗1
∗2
L L L
L L L L
∗3 ∗3 ∗3 ∗3
TAPE
STOP FF REW
LOADING UNLOADING
∗7 ∗7 ∗7 ∗7
∗3 ∗3 ∗3 ∗3
∗4 ∗4 ∗4 ∗4
∗2 ∗2 ∗5
H/L
H/L L H L
∗6 ∗6 ∗6
L
∗6 ∗6 ∗6 ∗6
∗5. Unstable period pulse.
∗6. DC voltage 1~5V.
∗7. Hi-Z (2.5V).
REC •
REC
PAUSE
∗1 ∗1
L L
L H
∗3 ∗3
TAPE
PB REC
∗7 ∗7 ∗1
∗3 ∗3 ∗3
∗4 ∗4 ∗4
∗5 ∗2 ∗2
H L L
∗6 ∗6 ∗6
∗6 ∗6 ∗6