Read Sony XR-3750 / XR-3758 / XR-3759 / XR-7750 / XRS-888 Service Manual online
– 19 –
Pin No.
Pin Name
I/O
Function
72
BUSON
O
Bus on/off control signal output terminal “L”: bus on Not used (pull up)
73
SYSRST
O
Reset signal output terminal “L”: reset Not used (pull up)
74
VREG
O
CPU regulator output terminal Connected to capacitor
75
GND
—
Ground terminal
76
X OUT
O
Main system clock output terminal (4.5 MHz)
77
X IN
I
Main system clock input terminal (4.5 MHz)
78
CE
I
CPU chip enable signal input (fixed at “H”)
79
VDD1
—
Power supply terminal (+5V)
80
RESET
I
System reset signal input from the reset signal generator (IC551) and reset switch (S551)
“L”: reset “L” is input for several 100 msec after power on, then it changes to “H”
“L”: reset “L” is input for several 100 msec after power on, then it changes to “H”
*1 loading/tape operation motor control
MODE
TERMINAL
LM LOD (pin 8)
“H”
“L”
“H”
“L”
LM EJ (pin 9)
“H”
“H”
“L”
“L”
STOP
LOADING/
FORWARD
EJECT/
REVERSE
BRAKE
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