Yamaha 505 Service Manual Page 29

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GX-505/GX-505VCD
GX-505/VCD
Port
P94
P93
P92
P91
P90
P87
P86
P85
P84
P83
P82
P81
P80
PA7
PA6
VCC
PA5
PA4
PA3
PA2
PA1
PA0
VEE
AVSS
VREF
No.
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
Function
TAPE EQUALIZER SELECT [ H : 120 µ]
DECK SOLENOID ON
DECK CAPSTAN MOTOR ON
TAPE LOADING MOTOR CLOSE
TAPE LOADING MOTOR OPEN
VR ENCODER A
VR ENCODER B
MD ENCODER A
MD ENCODER B
HEAD PHONE DETECT [L : HP DETECT]
MIC DETECT
CASSETTE IN DETECT
DECK MECHA PLAY POSITION DETECT
CrO2 (70 µs) POSITION DETECT
AMP OVER CURRENT DC VOLTAGE DETECT [L : ABNORMAL DETECT]
+5V
DECK CLOSE SW
REC INHIBIT FORWARD (SIDE-A)
REC INHIBIT REVERSE (SIDE-B)
DECK OPEN SW
REEL MOTOR PULSE DETECT
TAPE MUSIC SENSOR
GND
GND
+5V
Name
TPEQ
SOL
CPM
CLOSE
OPEN
ENVA
ENVB
ENMA
ENMB
/HP
MIC
CASS
PLSW
CRO2
/IPRT
+5V
CLSW
RECINHF
RECINHR
OPSW
REEL
MUSIC
VEE
AVSS
VREF
IC8 : M38199EF [INPUT P.C.B.]
8 bit
µ-COM (SYSTEM CPU)
28
I/O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
(Note 1) Pin 62, 63
IN1B IN1A FUNCTION
(Pin 62) (Pin 63)
0 0 AUX
0 1 TUNER
1 0 TAPE
1 1 CD/VCD
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