Yamaha GX-505 Service Manual page 29

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