Maxon Telecom SM-2000 service manual Page-52 December

MAXON SM-2000 MOBILE

VOLTAGE CHARTS (SM-2150/VHF)

IC404

PIN	TX UNMODE	RX MODE
1	1.9	VOICE 1.9
2	1.9	VOICE 1.9
3	1.9	VOICE 1.9
4	5	5
5	1.9	VOICE 1.9
6	1.9	VOICE 1.9
7	1.9	VOICE 1.9
8	1.9	VOICE 1.9
9	1.9	VOICE 1.9
10	1.9	VOICE 1.9
11	GND	GND
12	1.9	VOICE 1.9
13	1.9	VOICE 1.9
14	1.9	VOICE 1.9
	IC405
PIN	TX	RX
1	1.93	2.00
2	1.93	2.00
3	1.8	2.00
4	0	0
5	1.92	2.00
6	1.92	2.00
7	1.92	2.10
8	5.00	5.00
	IC406
PIN	TX	RX
1	3.05	AF 1.05
2	1.9	1.9
3	1.9	1.9
4	5	5
5	1.9	1.9
6	1.9	1.9
7	1.9	1.9
8	1.9	1.9
9	1.9	1.9
10	1.9	1.9
11	GND	GND
12	1.9	1.9
13	1.9	1.9
14	1.9	1.9

	IC407
PIN	NORMAL	OPTION
1	1.9	XT2
2	0	XT2
3	3.6	XT2
4	0	XT2
5	2	1.9
6	5	5
7	1.9	1.9
8	1.05	XT2
9	5	CLK
10	GND	GND
11	5	CLK
12	0	0
13	2	1.9
14	2	1.9
	IC410
PIN	BUSY	RX
1	AUDIO	1.9
2	AUDIO	1.9
3	AUDIO	1.9
4	5	5
5	AUDIO	1.9
6	AUDIO	1.9
7	AUDIO	1.9
8	AUDIO	1.9
9	AUDIO	1.9
10	AUDIO	1.9
11	GND	GND
12	AUDIO	1.9
13	AUDIO	1.9
14	AUDIO	1.9

	IC107	IC105	IC402
PIN		1		2	3
IC107		13.7		0	8
IC105/402		8		0	5

Page-52-

December 98