Midland Radio SP-300 service manual Transmit State

MAXON

SP-300 HAND HELD

TRANSMIT STATE

PIN #	IC1	IC2	IC3	IC5	IC6	IC401	IC402
1	GND	1.6M	0.0	-	1.3	1.9	0.0
2	GND	5.0	0.0	-	GND	1.9	0.0
3	GND	5.0	0.0	-	0.0	1.9	0.0
4	5.0	5.0	GND	-	GND	1.9	0.0
5	GND	5.0	-	-	1.5	0.0	0.0
6	7.5	0.0	-	-	7.5	0.0	0.0
7		0.0	-	-	7.5	0.0	GND
8		0.0	5.0	-	1.5	1.9	0.0
9		5.0		-		1.9	2.1
10		2.6		-		2.1	0.0
11		2.6		-		2.2	0.0
12		5.0		-		2.2	0.0
13		3.0		-		5.0	0.0
14		0.0		-		5.0	5.0
15		0.0				5.0
16		5.0				5.0
17		5.0
18		0.0
19		0.0
20		2.5
PIN #	IC404	IC406	IC407	IC408	IC410	IC411
1	A	3.7	1.9	0.0	AUDIO	2.0
2	AUDIO	1.9	0.0	0.0	AUDIO	4.0
3	AUDIO	1.9	1.9	0.0	AUDIO	1.9
4	5.0	5.0	1.9	0.0	5.0	1.9
5	AUDIO	1.9	1.9	GND	AUDIO	0.0
6	AUDIO	1.9	5.0	5.0	AUDIO	GND
7	AUDIO	1.9	1.9	5.0	AUDIO	GND
8	AUDIO	1.9	A	5.0	AUDIO	GND
9	AUDIO	1.9	CLK		AUDIO	5.0
10	AUDIO	1.9	0.0		AUDIO	5.0
11	GND	0.0	5.0		GND	0.0
12	AUDIO	1.9	0.0		AUDIO	1.9
13	AUDIO	1.9	1.9		AUDIO	1.9
14	AUDIO	1.9	1.9		AUDIO	0.0
15						0.0
16						5.0
17
18
19
20

Page -28- May 2001