Yamaha RX-V990, Service Manual

Page: 19 / 85

RX-V990
IC801 : HD6473724F
8 bit µ-COM
No. Port Name
110
Function
28
P43/FS19 P12
o
1-
29
P42/FS18 P11
0
30
P41/FS17 P10 0
31
P40/FS16 P9
0
32
P50/FS15 P8 0
33 P51/FS14 P7 0
Fluorescent character display tube anode drive signal
34
P52/FS13 P6 0
35
P53/FS12 P5 0
36
P54/FS11 P4 0
37
P55/FS10 P3 0
38
P56/FS9 P2 0
39
P57/FS8 P1 0 1-
40
P17NDISP VP VP (-25V)
41
P60/FDO 16G 0 1-
42 P61/FD1
15G
0
43
P62/FD2 14G 0
44
P63/FD3 13G 0
45 P64/FD4
12G
0
46
P65/FD5 11G
0
47 P66/FD6
10G
0
48
P67/FD7
9G
0
49
P70/FD8
8G
0
Fluorescent character display tube grid drive signal
50
P71/FD9
7G
0
51
P72/FD10
6G
0
52
P73/FD11 5G 0
53
P74/FD12 4G 0
54
P75/FD13 3G 0
55
P76/FD14 2G 0
56
P77/FD15 1G
o
1-
57 VCC
VCC
+5V
58
P80 ASA
0
] A-D select (4051)
59
P81 ASB 0
60
P82 ASC 0
61
P83 SPR 0
Speaker relay (CENTER, REAR & PHONES)
62
P84 SPA
0
] Speaker relay (MAIN NB)
63
P85 SPB
0
64
P86
PRY
0
Power relay
65
P87 FMC
0
Full MUTE
66
P90
lIE
0
Video Type Select (Internal synchronization)
67
P91/SCK1
SCK
0
LC78213, TC9273N, LC7535, LM7000N Serial clock
68
P92
CKB
0
BU2090 Serial clock
69
P93/S01
SDT
0
LC78213, TC9273N, LC7535, LM7000N Serial data
70
P94/SCK2 XCK
0
YSS223 Serial clock
71
P95 DTB
0
BU2090 Serial data
72
P96/S02
XDT
0
YSS223 Serial data
73
P97
N.C.
74
PAO VUP
0
Volume up
75
PA1 VDN 0
Volume down
76
AVCC AVCC
+5V for A-D
77 POO/ANO 4051
I Key switch, Rec out switch & Signal meter in (A-D)
78
P01/AN1
PRD I Protection 1 (A-D)
79
P02/AN2
PRV I Protection 2 (A-D)
80
P03/AN3
V2 I Frequency step switch & PAUNTSC switch (A-D)
18