Table of Contents
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P500
D0 46
D1 14
D2 45
ADDRESS LATCH
D3 13
A16
23
18
D0
2
D4 44
A
G1
D1
U501
U518
A17
22
19
D1
3
D5 12
B
G2
D2
74HC154
74HC574
A18
21
D2
4
C
D3
D6 43
A19
20
D3
5
D7 11
D
D4
D4
6
A12 36
D5
D3
D5
7
A13
4
D6
4
D6
8
A14 35
ADDRESS LATCH
D7
18
D7
9
A15
3
D8
G1
A12
23
19
11 CLK
A16 34
A
O3
U500
A13
22
1 OC
A17
2
B
74HC154
Q6
A14
21
A18 33
C
14
A15
20
3
A19
1
D
O2
19 G2
6
MREQ 15
O5
8
31
O7
5
32
O4
2
63
O1
O6
64
7
THERMAL SENSOR 56
1
+5V
CS
20
INTR 5
Vcc
R509
6
VIN+
10k
9
18
D0
VREF
DO
U506
C502
R508
17
D1
D1
ADC0804
.1
10k
+ C507
7
16
D2
V IN -
D2
10
8
15
D3
GND A
D3
+ C505
10
14
D4
GND D
D4
10
4
13
D5
CLK IN
D5
C503
R510
12
D6
D6
150pF
10k
19
11
D7
R505
CLKR
D7
R570
2k
1k
2
RD 47
RD
C501
3
WR 48
WR
.015
SOURCE
+5V
+5V IN 28
C506
+5V IN 29
Z501
10
+
+ C522
C521
R515
+5V IN 60
47
.01
1k
+ C504
+5V IN 61
10
CR501
ACCESSORY
REMOVE FOR EDACS OPTION
REPEATER/BASE
D0
+15V
J506
+15V
D1
ACCESSORY 24
F501
2
CR548
+15V
2A
P506
D2
ACCESSORY 25
1
R576
C533
D3
CR526
2.7k
.01
D4
CR523
D5
SOURCE
D6
FILTERED
D7
+15V
+15V
L501
FILTERED 26
+15V
+ C530
C531
+ C532
C529
R578
FILTERED 58
220
.01
1000
.01
2.7k
CR525
ALARM 2 OUT+ 20
14
8
ALARM 2 OUT- 52
1
7
RPTR ON/OFF 57
2,1
+5V
+15V
3
S508
R532
6
R524
4.7k
4.7k
K501
Q501
3658
ALARM 1 OUT+ 19
14
8
ALARM 1 OUT- 51
1
7
+5V
2,13
+15V
6
R535
R527
4.7k
4.7k
K500
Q500
3658
-5V
-5V IN 27
-5V IN 59
R577
C538
1k
.01
CR524
+15V
+15V IN 30
J502
+15V IN 62
Z500
+15V OUT
+ C523
C511
47
.01
10-25
+5V
R520
CR503
U508B
2.7k
C
19
4
3
D0
19
11
Q1
Q1
EN
U517
D1
18
R516
CR502
Q2
74HC573
U508C
2.7k
18
6
5
D2
17
8
Q2
Q3
D7
U508A
D3
16
7
R517
CR505
Q4
D6
74HC906
2.7k
17
2
1
D4
15
5
Q3
Q5
D4
D5
14
D5 6
R519
CR504
Q6
U508E
2.7k
15
10
11
D6
13
Q5
Q7
D7
12
R518
CR500
Q8
U508D
2.7k
16
8
9
1 OC
Q4
+5V
13
2 D1
4
Q7
D3
Q8
D8
D2
R507
12
10k
9
3
10
12
U507D
11
13
4
5
U507B
U509A
R503
3403
U509B
1
5
3
3
IFA D1
RSSIO
+
5.1k
1
5
3403
+
C520
R575
2
7
+ C509
.1
82k
6
15
1
IFA D2
C528
U519
.01
SAG04AD
R573
5.1k
14
IFA OUT
R574
6
U509C
C510
51k
9
8
9
3403
33
R572
12
16
8
LIM IN
IFA IN
16k
10
+
+12V
U507C
+ C524
R571
+8V
10
10k
10
3
LIM D2
MUTE IN
+ C508
33
11
LIM D1
11 CLK
15
8
14
Q5
U503
2
14
7
1
Q6
D1
74HC574
2,1
+5V
+15V
3
3
D2
R529
4
6
D3
R521
4.7k
4.7k
5
17
D4
Q3
K502
Q502
6
3658
8
14
D5
7
7
D6
+5V
2,1
+15V
8
D7
3
R501
9
6
R500
D8
4.7k
4.7k
16
Q4
K503
Q503
3658
R523
10k
R522
10k
2
3
+
+5V
C536
.1
R557
R556
10k
10k
WO 501
18
12
Q2
Q8
WO 502
13
Q7
19
Q1
SOURCE
SOURCE
OC
+15V
+12V
+8V
1
U522
U523
3
1
1
3
78L12
78M08
+ C527
+ C525
+ C526
C539
.01
.1
2
10
2
1
NOTES:
1. ALL RESISTORS ARE IN OHMS AND ALL CAPACITORS IN
MICROFARADS UNLESS OTHERWISE SPECIFIED.
August 2000
Part No. 001-2001-200
P501
D0
2
19
D1
Q1
12 RF MUX 1 INH
U505
D1
3
18
D2
Q2
13 RF MUX 2 INH
74HC574
R513
R514
R559
D2
4
17
D3
Q3
14 RF MUX 3 INH
10k
10k
10k
D3
5
16
D4
Q4
15 PC STR
D4
6
15
D5
Q5
16 HS CS EX
D5
7
14
D6
Q6
26 SYN CS EX
D6
8
13
D7
Q7
25 HS CS RX
R539
D7
9
Q8 12
D8
10 SYN CS RX
100k
11 CLK
1
OC
11 WO 1
1 GROUND
9 AC FAIL IN
2
D1
1 OC
D0
19
Q1
U521
74HC573
D1
18
Q2
D2
17
Q3
11
D3
16
Q4
CLK
D0
2
19
D4
15
D1
Q1
29 RF DATA 1
Q5
U504
D1
3
18
D5
14
D2
Q2
30 RF DATA B
Q6
74HC574
J500
D2
4
17
D6
D3
Q3
31 RF DATA C
13
Q7
2
U507A
D3
5
16
D7
12
D4
Q4
32 RF DATA
Q8
1
D4
6
15
D5
Q5
8 RF CLOCK
D5
7
13
D6
23 AC FAIL OUT
Q7
D6
8
Q8 12
D7
24 WO 2
D7
9
D8
14
1
Q6
OC
+5V
R543
U508E
10k R544
74HC906
1k
12
13
7 EXT REQ 1
CR533
15V
CR534
15V
28 A D LEVEL
1 ALARM 3 OUT+
17 ALARM 3 OUT-
2 ALARM 4 OUT+
18 ALARM 4 OUT-
1
WO 512
4
WO 513
5
WO 514
6
C534
WO 515
19
100pF
C535
100pF
WO 516
20
WO 517
21
R526
10k
27 I/O 13
U514A
WO 518
R522
LM2904
U514B
10k
R537
1
6
LM2904
1k
7
22 BUF RX WBAND
R531
+5V
R533
5
+
INVERTED
CR531
4.32k
1k
15V
NON-INVERTED
CR534
C537
R530
R534
U503 CONTROL NON-
15V
10k
1M
.1
INVERTED
3 RX WBAND
+5V
C512
C513
C514
C515
C516
C517
C518
C519
C500
.01
.01
.01
.01
.01
.01
.01
.01
.01
P500
+5V
R536
ALARM 1 IN +
CR507
10k
S500
R502 430
8
1
+5V
R541 200
5
6
7
2
1
+15V
6
3
2
5
4
4
U520
4N35
R528
1.2K
CR506
ALARM 1 IN -
+5V
R562
ALARM 2 IN +
CR509
10k
S501
R548 430
8
1
+5V
R569 200
5
6
7
2
+15V
1
6
3
2
5
4
4
U510
4N35
R555
1.2K
CR508
ALARM 2 IN -
3
R563
D2
10k
CR535
R545
R549
R550
R551
R564
4.3V
10k
10k
10k
10k
3.9k
R552
10k
6
EXT REQ 2
D5
7
CR533
D6
WO 503
15V
8
CR534
D7
WO 504
15V
9
D8
WO 505
4
D3
5
D4
U513C
R504
1K
J503
10
11
3
P503
CR533
12
2
5.1V
1
ALARM 3 IN +
+5V
R561
CR511
10k
S511
R547 430
8
1
+5V
R568 200
5
6
7
2
1
+15V
6
3
2
5
4
4
U511
4N35
R554
1.2K
CR510
ALARM 3 IN -
R506
U513B
1K
J504
3
4
3
P504
CR528
5
2
5.1V
1
ALARM 4 IN +
+5V
R560
R546
CR513
10k
S503
430
8
1
+5V
R567 200
6
5
7
2
+15V
1
6
3
2
5
4
4
U512
4N35
R553
1.2K
ALARM 4 IN -
CR512
+15V
R558
R511
10k
20k
SQUELCH
SQUELCH ENABLE
ENABLE OUT
P505
J505
Q504
R512
CR529
1
3616
10k
15V
2
CR530
3
Q505
15V
3616
4
IAC SCHEMATIC
FIGURE 10-30
5
37
6
38
10
7
39
8
40
9
FOLDOUT
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