Main Unit - Vertex Standard VX-900 Service Manual

Circuit Diagram
2.5V
(0V)
-11dBµ
0V
(0.9V)
-8dBµ
7.4V
0V
(5.0V)
2.6V
(0.6V)
4.5V
(0.1V)
0V
(5.0V)
POWER ON: 5.0V
POWER OFF: 0V
7.4V
LAMP KEY
ON: 2.6V
OFF: 3.2V
3.6V
0V
MON KEY
TOGGLE SW
ON: 2.3V
A: 0V
OFF: 3.1V
CENTER: 1.8V
B: 3.6V
INT SP
BUSY: 7.3V
MUTE: 0.6V
EXT SP
BUSY: 7.3V
MUTE: 0.6V
4 Vp-p
INT SP: 1.9V 0.16Vp-p
EXT SP: 0V
INT SP EXT SP
BUSY: 7.4V
BUSY: 0.5V
MUTE: 7.4V MUTE: 0.2V
PO 5W: 3.9V
3.0V
(0V)
3.6V
4.8V
(0V)
5.0V
BUSY:
3.3V
(0V)
0V NORMAL TEMPERATURE: 1.6V
(3.3V)
LAMP
ON: 5.0V
OFF: 0V
0.6V
BUSY: 6.4V
MUTE: 7.4V
INT SP
BUSY: 0.6V
MUTE: 0.2V
EXT SP
BUSY: 1.3V
MUTE: 7.4V
7.4V
INT SP: 0V
EXT SP: 5.0V
0.1Vp-p
-1dBµ
3.8V
(4.2V)
2.8V
(3.0V)
0.9V
3.0V
(2.6V)
0.8V
0.7V
(0.8V)
WIDE: 0.8V
NARROW: 5.0V
1.8V
7.4V
3.6V
4.7V
(0V)
2.7V
1.0V
(0V)
(0V)
+6dBµ
-5dBµ
4.2V
5.0V
4.2V
(3.9V)
3.0V
(3.0V)
4.4V
0.8V
LOCK: 3.5V
UNLOCK: 0V
3.5V
3.4V
3.6V
BUSY
3.4V
0V
(0V)
(3.4V)
3.5V
(0.1V)
3.4V
5.6V
WIDE: 5.0V
NARROW: 0V
LAMP
ON: 0V
OFF: 5.0V

Main Unit

3.0V
0.6V
(0V)
(0V)
WIDE: 3.2V
NARROW: 0V
4.3V
2.6V
NORMAL TEMPERATURE: 2.2V
RX (TX)
FREQUENCY: 160.025 MHz
DEV: 3 kHz
AUDIO: 1 kHz
SP IMPEDANCE: 16-ohm
0V
(3.4V)
27