Sony SLV-E177EG Service Manual page 46

5-3. SYSTEM CONTROL – MECHANISM BLOCK INTERFACE (MA-314 BOARD IC161)
Signal Pin No. I/O
MA-314
CAM O
IC161%•
MA-314
MODE 1 I
IC161@ª
MA-314
MODE 2 I
IC161@•
MA-314
MODE 3 I
IC161@¶
MA-314
MODE 4 I
IC161@§
MA-314
REC PRF I
IC161#º
MA-314
T REEL I
IC161*º
MA-314
S REEL I
IC161&ª
MA-314
END LED O
IC161@º
MA-314
T SENS I
IC1617
MA-314
S SENS I
IC1616
∗1. "L" when erasing protection tab is bent. "H" when not bent.
∗2. Pulse of period in proportion to reel rotating speed.
∗3. Approx. 2 msec period "H" pulse.
∗4. Normally "L" .2 msec period "H" pulse when tape top or tape end is detected.
∗5. Hi-Z
TAPE
CASSETTE CASSETTE
EJECTED THREAD-
LOADING UNLOADING
ING
M H/M L/M H/M
H – – L
H – – L
L – – H
L – – H
L
*1 *1 *1
H/L H/L H/L H/L
H/L H/L H/L *2
L
*3 *3 *3
*3 *3 *3 *4
*3 *3 *3 *4
TAPE
UNTHREAD- STOP FF REW
ING
L/M M M M
L H H H
L H H H
H H L L
H L H H
*1 *1 *1 *1
H/L H/L *2 *2
*2 H/L *2 *2
*3 *3 *3 *3
*4 *4 *4 *4
*4 *4 *4 *4
PB REC
M M
H H
L L
L L
L L
*1 *1
*2 *2
*2 *2
*3 *3
*4 *4
*4 *4