SERVICE MANUAL

5-2
5-3. SYSTEM CONTROL – MECHANISM BLOCK INTERFACE (MA-315 BOARD IC161)
Signal Pin No. I/O EJECTED
CAM
MODE 1
MODE 2
MODE 3
MODE 4
REC PRF
T REEL
S REEL
END LED
T SENS
S SENS
MA-315
IC161%•
MA-315
IC161@ª
MA-315
IC161@•
MA-315
IC161@
MA-315
IC161@§
MA-315
IC161#º
MA-315
IC161*º
MA-315
IC161&ª
MA-315
IC161@º
MA-315
IC1617
MA-315
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
CASSETTE CASSETTE
LOADING UNLOADING
TAPE TAPE
THREAD- UNTHREAD- STOP FF REW PB REC
ING ING
O M H/M L/M H/M L/M M M M M M
I H – – L L H H H H H
I H – – L L H H H L L
I L – – H H H L L L L
I L – – H H L H H L L
I L *1 *1 *1 *1 *1 *1 *1 *1 *1
I H/L H/L H/L H/L H/L H/L *2 *2 *2 *2
I H/L H/L H/L *2 *2 H/L *2 *2 *2 *2
O L *3 *3 *3 *3 *3 *3 *3 *3 *3
I *3 *3 *3 *4 *4 *4 *4 *4 *4 *4
I *3 *3 *3 *4 *4 *4 *4 *4 *4 *4