Sony SLV-M20HF - Video Cassette Recorder, Service Manual

Page: 59 / 143

5-1.
SYSTEM CONTROL
— VIDEO BLOCK INTERF
ACE (MA-335 BOARD IC161)
*1
Sync
hr
oniz
ed with dr
um r
otation. 30Hz 50% duty c
y
cle.
*2
Normally “L“. “H“ when CTL signal is not generated.
*3
V period “H“ pulse.
*4
Selected by REC mode. “H“ in LP mode.“
*5
Composite sync signal (positi
v
e).
Signal
RF SWP QVD V SYNC NT JUDGE
Pin No.
1 4 ^§ !£
I/O
O O
I
O
ST
OP
FF/REW
*1
L
*4
L
T
APE
THREADING
*1
L
*5
L
T
APE
UNTHREADING
*1
L
*5
L
PB
*1 *2 *5
L
PB P
AUSE
*1 *3 *5
L
SLOW
*1 *3 *5
L
CUE
*1 *3 *5
L
x 2
*1 *2 *5
L
REVIEW
*1 *3 *5
L
REC
*1
L
*5
L
REC P
AUSE
*1
L
*5
L
5-2.
SYSTEM CONTROL
— SER
VO PERIPHERAL
CIRCUIT INTERF
ACE (MA-335 BOARD IC161)
*1.
30Hz pulse.
*2.
Pulse at tape running.
*3.
Re
v
er
se lo
gic pulse of STEP PLS.
*4.
“L” when drum rotation stops.
*5.
Unstable period pulse.
*6.
Pulse in period in proportional to tape speed.
*7.
360Hz pulse.
*8.
Pulse at tape running.
*9.
Approx. 2 msec period “H” or “L” pulse.
*10.
Approx. 1.5 msec period “H” or “L” pulse.
*11.
“L
” when FWD SLO
W
,
“H”
w
hen R
VS SLO
W
.
Signal
REC CTL CAP ST
OP
STEP PLS PB CTL DRM PG DRM FG CAP FG CAP D
A
DRM D
A
CTL RESET
Pin No.
7 #∞ (ª ^¶ ^• ^ª &º &£ &¢ 8
I/O
O
O (O.D)
O
I I I I
O O
I/O
ST
OP
Hi-Z
L L H
*4 *4
H/L
*8
*10
Hi-Z
FF
Hi-Z
Hi-Z (O.D)
L
*6 *1 *7 *6 *8
*10
Hi-Z
REW
Hi-Z
Hi-Z (O.D)
L
*6 *1 *7 *6 *8
*10
Hi-Z
T
APE
THREADING
Hi-Z
Hi-Z (O.D)
L
*5 *5 *5 *8
*10
Hi-Z
T
APE
UNTHREADING
Hi-Z
Hi-Z (O.D)
L
*5 *5 *5 *8
*10
Hi-Z
PB
Hi-Z
Hi-Z (O.D)
L
*1 *1 *7 *6 *9
*10
Hi-Z
PB P
AUSE
Hi-Z
L L
H/L
*1 *7
H/L
*8
*10
Hi-Z
SLOW
Hi-Z
*3 *2 *2 *1 *7 *2 *8
*10 *11
CUE
Hi-Z
Hi-Z (O.D)
L
*6 *1 *7 *6 *9
*10
Hi-Z
x 2
Hi-Z
Hi-Z (O.D)
L
*6 *1 *7 *6 *8
*10
Hi-Z
REVIEW
Hi-Z
Hi-Z (O.D)
L
*6 *1 *7 *6 *9
*10
Hi-Z
REC
*1
Hi-Z (O.D)
L
*1 *1 *7 *6 *9
*10
Hi-Z
REC P
AUSE
Hi-Z
Hi-Z (O.D)
L H
*1 *7
H/L
*8
*10
Hi-Z
SECTION 5
INTERFACE, IC PIN FUNCTION DESCRIPTION
SLV-M20HF
5-1