Maxon Telecom SM-2000 service manual Voltage Charts SM-2450/UHF

MAXON SM-2000 MOBILE

VOLTAGE CHARTS (SM-2450/UHF)

VOLTAGE CHARTS (SM-2450/UHF)

IC409

PIN	DESCRIPTION	TX	RX	PIN	DESCRIPTION	TX	RX
1	DATA	0	0	21	CH-4
2	EEPROM ENABLE	0	0	22	CH-8
3	PLL ENABLE	5	5	23	MONITOR	5	5/0
4	CHANNEL SPACING	5/0	5/0	24	PTT	0	3.9
5	DATA IN	0	0	25	PROG. ENABLE	5	5
6	RED L.E.D.	5	0	26	TX ENABLE	5	0
7	BUSY	5/0	0	27	ALERT TONE	0	0
8	EXT OPTION	5	5	28	MF6 CLK	CL	CL
9	HOOK SW	0/3.7	0/3.7	29	CALL DETECT	0	0
10	LOCK DET	0	0	30	SEND UP CONTROL	0	0
11	TEST	5	5	72	GND	0	0
12	X1	5	5	73	VCC	5	5
13	X2 (OPEN)	0	0	74	OSC1	2.3	2.3
14	GND	0	0	75	OSC2	2.3	2.3
15	D TO A	5/0	0	76	RESET	0	0
16	D TO A	5/0	0	77	AUDIO ENABLE	5	5/0
17	TONE ENABLE	5/0	0	78	GREEN L.E.D.	0	5
18	D TO A	5/0	0	79	RX ENABLE	0	5
19	CH-1			80	CLK
20	CH-2

IC411

PIN	1	2	3	4	5	6	7	8
RX VOLTAGE	0	4	1.9	1.9	0	0	0	0
TX VOLTAGE	0	1.2	1.9	2.75	2.75	0	0	2
PIN	9	10	11	12	13	14	15	16
RX VOLTAGE	5	2	2.7	5	3.5	5	0
TX VOLTAGE	0	3	2.7	5	3.5	5	0	0

IC412

PIN	NORMAL	PROGRAM
1	0	0
2	0	0
3	0	0
4	0	0
5	0	0
6	GND	GND
7	GND	GND
8	GND	GND
9	5	0
10	5	0
11	5	0
12	0	0
13	3.6	3.6
14	3.6	3.6
15	0	0
16	5	5

IC401

PIN	TX	RX
1	0	0
2	0	0
3	2	1
4	2	2
5	5	0
6	5	5
7	0	0
8	SAT	2
9	SAT	2
10	0	0
11	0	0
12	0	0
13	5	5
14	5	5

Page-54-

December 98