Service manual

6-17
March 2000
Part No. 001-3139-502
RVM SCHEMATIC (1 OF 2)
FIGURE 6-8
FOLDOUT
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
U10A
55121
U11A
55122
+5V
13
15
14
1
2
7
1
2
3
4
5
6
U10B
55121
9
10
11
12
13
14
15
19
51
U7A
12
44
63
TxD0
INT POLL
U7B
34
41
RxD0
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
U1
UPD70320
U47A
74HC08D
U6D
13
4
3
2
1
45
RxD1
55
U26A
55121
U11B
55122
+5V
9
11
10
12
7
1
2
3
4
5
6
U26B
55121
9
10
11
12
13
14
15
20
52
U7E
1110
U7C
65
U6C
53
143
5
47
PO 1
TxD1
4
PO 0
Rx CONTROL
+5V
R101
10k
R105
10k
R109
10k
R113
10k
R116
10k
R119
10k
R122
10k
R125
10k
89
10
11
12
13
14
15
16
7
6
5
4
3
2
1
S3
60
62
64
74
73
72
71
70
69
68
67
PT7
PT6
PT5
PT4
PT3
PT2
PT1
PT0
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
13
14
15
16
17
18
19
20
R / W
MREQ
83
2
60
INTP0
12
11
10
8
PO 7
PO 6
PO 5
PO 4
8
7
6
5
1
2
3
4
S2
R112
10k
R106
10k
R104
10k
R100
10k
+5V
U5B
U5E
152
125
23
57
P1
TxD A
30
31
2
39
38
37
RxD A
IP3
IP4
IP5
IP6
6
5
3
1
RS4
RS3
RS2
RS1
U31
88C681
Y1
3.686 MHz
C85
10pF
C86
4.7pF
33
32
X2
X1/CLK
R120
10k
+5V
R175
10k
R174
10k
(U39 - U44)-1 (2)
INC
14
OP5
S5
116
(U39 - U44)-2(2)
U/D
36
27
IP2
OP4
2
1
J6
7
IP0
8
935
WR RD
CE
U12B
6
5
4
U12A
74HC32D
3
2
1
U7D
74HC04
+5V
R162
10k
U35D
89
U12C
74HC32D
8
9
10
9
8
INTRN
21
RESET
34
D0
D1
D2
D3
D4
D5
D6
D7
OP7
D0
D1
D2
D3
D4
D5
D6
D7
25
16
24
17
23
18
22
19
TxD B
RxD B
IP1
OP0
OP1
OP2
OP3
OP6
15
11
10
4
29
12
28
13
26
U39-7 (2)
U27-10 (2)
U27-26 (2)
U27-25 (2)
U40-7 (2)
U42-7 (2)
U41-7 (2)
U43-7 (2)
U44-7 (2)
RD
WR
U24
88C681
A0
A1
A2
A3
6
5
3
1
RS4
RS3
RS2
RS1
A0
A1
A2
A3
U5D
U5C
116
143
47
59
P1
TxD A
30
31
RxD A
Y5
3. 686 MHz
C79
10pF
C81
4.7pF
33
32
X2
X1/CLK
4
10
IP1
RxD B
U28-25 (2)
U28-26 (2)
34
RESET
R161
10k
+5V
2
1
J2
7
IP0
R160
10k
+5V
21
INTRN
U17D
56
8
935
WR RD
CEN
R96
10k
U36A
2
1
R97
10k
U36F
13
12
R98
10k
U36E
1110
R99
10k
U36D
98
R103
10k
U36B
34
R107
10k
U35E
1110
R111
10k
U49B
34
R115
10k
U35E
1312
+5V
OP0
OP1
OP2
OP3
OP4
OP5
OP6
OP7
29
12
28
13
27
14
26
15
R140 1k
R139 1k
R138 1k
R137 1k
R136 1k
R135 1k
R134 1k
R133 1k
+12V
R102
10k
R106
10k
R110
10k
R114
10k
R117
10k
R126
10k
+5V
36
2
39
38
37
8
IP2
IP3
IP4
IP5
IP6
9
5
4
3
2
1
12
13
14
15
16
S5
D0
D1
D2
D3
D4
D5
D6
D7
25
16
24
17
23
18
22
19
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
25
16
24
17
23
18
22
19
D0
D1
D2
D3
D4
D5
D6
D7
U23
88C681
28
12
29
36
IP2
OP2
OP1
OP0
R146
10k
R145
10k
R144
10k
+5V
U14
145158
9
10
11
CLK
DATA
LE
U15
74HC74
Q
Q
D
CLK
R
S
+5V
+5V
13
F
R
U45-10/-11 (2)
120 kHz
2
3
1
5
6
4
8
F
IN
Y2
3.686 MHz
C56
10pF
C59
4.7pF
30
31
TxD A
RxD A
8
9
WR
RD
R147
10k
+5V
U35B
34
13
R127
10k
+5V
U35A
12
1
3
5
6
A0
A1
A2
A3
RS1
RS2
RS3
RS4
34
RESET
23
22
21
20
A16
A17
A18
A19
A
B
C
D
U4
74HC154
3
O2
9
1
O8
O0
4
O3
35
CE
5
O4
17
7
6
O5
O6
O15
1918
G1
G2
INTRN
21
33
32
X2
X1/CLK
4
10
IP1
RxD B
U29-26 (2)
U29-25 (2)
U5E
61
413
U5D
107
48
P1
OP3
R153
4.7k
+5V
R151
4.7k
Q1
3058
CR13
+12V
K1-1 (2)
R148
10k
R149
10k
R150
10k
R152
10k
+5V
S6
2
39
38
37
IP3
IP4
IP5
IP6
1
2
3
4
8
7
6
5
(BIT 0)
(BIT 1)
(BIT 2)
(BIT 3)
U25
MC2681
RESET
34 29
OP 0
7
65
64
58
57
56
66
55
81
54
52
61
51
48
PO3
U36-6 (2) AUDIO LEVEL
U37-6 (2) 1200 Hz
SCK0
TOUT
U38-2 (2) FSK 4
HLDRQ
U38-12 (2) AUDIO LVL 4
U38-6 (2) AUDIO CNTRL
HLDAK
U38-8 (2) FSK 3
P25
P17 U37-4 (2) NOTCH
P24
U38-10 (2) AUDIO LVL 3
RESET
U37-2 (2) FSK 2DMARQ1
U38-4 (2) AUDIO LVL 2
TC0
INTP0
U37-10 (2)
DMAAK0
U37-8 (2)DMARQ0
+5V
R159
10k
76
9
75
53
49
VTH
IC1
IC2
IC3
IC4
46
43
3
62
CTS1
CTS0
EA
INTP2/INTAK
PO2
6
R165
10k
R163
10k
59
NM1
+5V
S1
(BIT 8)
10 7
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A0
8
7
6
5
4
3
2
1
23
22
19
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
D0
D1
D2
D3
D4
D5
D6
D7
9
10
11
13
14
15
16
17
D0
D1
D2
D3
D4
D5
D6
D7
CE
18
WE
OC
2021
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A0
10
9
8
7
6
5
4
3
25
24
21
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
D0
D1
D2
D3
D4
D5
D6
D7
11
12
13
15
16
17
18
19
D0
D1
D2
D3
D4
D5
D6
D7
CE1
20
WE
OE
2227
U8
2816
U2
6264
23
2
A11
A12
A11
A12
1
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A0
10
9
8
7
6
5
4
3
25
24
21
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
D0
D1
D2
D3
D4
D5
D6
D7
11
12
13
15
16
17
18
19
D0
D1
D2
D3
D4
D5
D6
D7
CE
20
OE
22
U3
27C256A
23
2
A11
A12
A11
A12
1
A13
A14
26
27
A13
A14
+5VV
PP
U21
ADC0804
D0
D1
D2
D3
D4
D5
D6
D7
18
17
16
15
14
13
12
11
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
35
INTR
5
CS
WR
RD
32
R155
10k
C57
150pF
CLK R
CLK IN
V IN -
V IN +
V REF
19
4
7
6
9
U13-14 (2)
R157
10k
R156
10k
+5V
C62
.1
21
35
9
8
1
3
5
6
INTRN
CE
RD
WR
A0
A1
A2
A3
RS1
RS2
RS3
RS4
D0
D1
D2
D3
D4
D5
D6
D7
25
16
24
17
23
18
22
19
D0
D1
D2
D3
D4
D5
D6
D7
R121
10k
R124
10k
R118
10k
U49C
U49E
U49D
+5V
R141 1k
R143 1k
R142 1k
+12V
CR10 (YEL)
CR12 (GRN)
CR11 (YEL)
5
11
9
6
10
8
OP 4
OP 2
27
28
2
39
IP3
IP4
37
38
IP1
RxD B
4
10
U30-25 (2)
U30-26 (2)
IP5
IP6
R128
10k
R129
10k
R130
10k
R131
10k
+5V
R123
10k
(BIT 7)
(BIT 6)
(BIT 5)
(BIT 4)
4
3
2
1
5
6
7
8
S7
S5
U9
TL7705A
C82
.1
+
C125
2.2
REF
CT
1
3
2
7
6
5
R173
10k
RES IN
S8
+5V
RESET
SENSE
INPUT
R167
10k
RESET
R168
10k
+5V
U27-3 (2)
U28-3 (2)
U29-3 (2)
U30-3 (2)
RESET
NOTES:
1. ALL RESISTORS ARE IN OHMS AND ALL CAPACITORS IN MICROFARADS
UNLESS OTHERWISE SPECIFIED.
2. IC PINS NOT SHOWN:
U1
U2, U3
U4, U48
U5, U6
U7, U12, U15, U16, U17, U47, U50
U9
U10, U11, U48
U14
U21
U23, U24, U25, U31
IC
PIN NUMBERS
+5V
+12V -5V
-12V
GND
50,80
28
24
16
14
8
16
4
20
40
42,77
14
12
9
7
4
8
6
8,10
20
81
+5V
C53
.01
C52
.01
C51
.01
C50
.01
C49
.01
C48
.01
C47
.01
C46
.01
C45
.01
C44
.01
C43
.01
C42
.01
C41
.01
C40
.01
C39
.01
C38
.01
C37
.01
C36
.01
C34
.01
C32
.01
C31
.01
C30
.01
C29
.01
C28
.01
58
56
54
50
44
43
42
41
24
22
18
12
11
10
9
P1
R169
10k
+5V
R172
10k
CR1 (GRN)
CR2 (YEL)
CR3 (GRN)
CR4 (YEL)
CR5 (GRN)
CR6 (YEL)
CR7 (GRN)
CR8 (YEL)
SITE 1
SITE 2
SITE 3
SITE 4
(BIT 9)
Y5
12 MHz
C69
22pF
C67
22pF
OSC
OUT
OSC IN
2
1
R158
1k
Tx CONTROL
IP0
7
R154
10k
+5V
2
1
J3
R132
10k
+5V
J3
2
1
IP0
7
26
+5V
CE2