Main Unit - Vertex Standard VX-920 Series Service Manual

–7.0 dBµV emf
@154.1 MHz
RX: 0 V
TX: 1.4 V
PWR ON: 7.4 V
PWR OFF: 0 V
RX: 7.4 V
RX: 7.4 V
TX: 7.2 V
TX: 7.1 V
PWR ON: 0 V
SW ON: 0 V RX: 7.4 V PWR OFF: 7.4 V
RX: 5.1 V TX: 6.8 V
SW OFF: 3.6 V PWR ON: 5.0 V
TX: 4.4 V
PWR OFF: 0 V
SAVE ON: 0 V
SAVE OFF: 3.2 V
RX: 0 V
RX: 5.1 V
TX: 5.0 V TX: 0 V
TX: 0.1 V
SW ON: 0 V
SW OFF: 3.6 V
RX: 0.1 V 7.4 V
TX: 3.3 V
SW ON: 0 V
PWR ON: 1.7 V
SW OFF: 3.6 V
PWR OFF: 0 V
SW ON: 0 V
SW OFF: 3.6 V
[A]: 3.5 V
[Center]: 1.8 V
[B]: 0 V
BUSY: 7.4 V
3.5 V
MUTE: 0.6 V
TX: 0.6 V
3.5 V
RX: 3.1 V
TX: 3.5 V
BUSY: 1.4 V
MUTE: 7.4 V
TX: 7.4 V
9.3 V p-p
@0.7 W
0.1 V p-p
@0.7 W
INT: 1.9 V
EXT: 0 V
RX: 2.7 V
TX: 0.7 V
INT SP: 0 V
EXT SP: 2.7 V
INT SP BUSY: 0.6 V
INT SP MUTE: 0.2 V
EXT SP: 7.4 V
TX: 0.2 V
N/C MIC ON: 0.7 V
N/C MIC OFF: 0 V
INT SP: 7.4 V
EXT BUSY: 0.6 V
EXT SP MUTE: 0.2 V
N/C MIC ON: 0 V
TX: 0.2 V
N/C MIC OFF: 3.3 V
–9.0 dBµV emf
RX: 2.6 V
@154.1 MHz
TX: 0 V
RX: 0.8 V
TX: 0 V
RX: 2.5 V
TX: 0.7 V
RX: 7.4 V 0 V
TX: 7.2 V RX: 0 V
TX: 3.0 V
RX: 7.4 V
TX: 7.2 V
RX: 0 V
TX: 3.0 V
RX: 0 V
TX: 5.0 V
RX: 0 V
TX: 4.3 V
0 V
RX: 0 V
TX: 1.5 V
RX: 0 V
TX: 3.0 V
RX: 1.4 V
TX: 0 V
RX: 3.2 V
TX: 0 V
RX: 4.1 V
TX: 0 V
PWR ON: 5.0 V
PWR OFF: 0 V
2.6 V @25 °C
MUTE: 0.9 V
BUSY: 3.4 V
TX: 3.4 V
3.5 V
3.5 V
MUTE: 3.3 V
BUSY: 0.6 V
TX: 0.6 V
7.4 V
7.4 V
0.2 V p-p
3.5 V
0.1 V p-p
@0.7 W
BUSY: 0.1 V
MUTE: 7.4 V
TX: 7.4 V
BUSY: 3.3 V
MUTE: 0 V
TX: 0 V
RX MAIN: 0 V
RX SUB: 2.7 V
TX: –0.5 V
0.3 dBµV emf
@154.1 MHz
RX: 2.0 V
TX: 0 V
RX MAIN: 2.7 V
RX SUB: 0 V
TX: 0 V
SAVE ON: 3.2 V
SAVE OFF: 1.8 V
TX: 0 V
SAVE ON: 3.2 V
SAVE OFF: 1.8 V
TX: 3.2 V
RX: 2.8 V
TX: 0 V RX: 2.1 V
RX: 0 V TX: 2.2 V
TX: 2.9 V
RX: 0.7 V
TX: 0.8 V
2.2 V
RX: –3.3 V
TX: 0.2 V
0.2 V
3.5 V
0.8 V
RX: 3.4 V RX: –4.1 V
0.1 V
RX: –1.3 V TX: –4.5 V TX: –4.6 V
TX: –0.5 V
RX: –4.0 V
TX: 0 V
RX: –1.7 V RX: 0.1 V
TX: –0.9 V TX: 3.3 V
RX: –4.8 V
RX: 2.8 V
TX: –5.0 V
TX: 2.3 V
5.0 V
RX: –4.1 V
TX: –4.6 V
MUTE: 0.5 V
BUSY: 0.8 V
TX: 0.1 V
SAVE ON: 0 V
SAVE OFF: 3.5 V
MUTE: 0.3 V
BUSY: 0.8 V 3.5 V
TX: 0.1 V
RX: 0 V
TX: 5.0 V
5.0 V
RX: 0.9 V
TX: 3.4 V
3.5 V
CLOCK SHIFT ON: 0.8 V
CLOCK SHIFT OFF: 0.7 V
CLOCK SHIFT ON: 0.6 V
3.5 V
CLOCK SHIFT OFF: 0.7 V
CLOCK SHIFT ON: 1.3 V
CLOCK SHIFT OFF: 3.0 V
OPTION ON: 0 V
OPTION OFF: 3.3 V
LED OFF: 2.8 ~ 3.3 V LED OFF: 2.7 ~ 3.3 V LED OFF: 3.5 ~ 3.3 V
LED LOW: 1.6 V LED LOW: 1.8 V LED LOW: 2.6 V
LED HI: 1.4 V LED HI: 1.6 V LED HI: 2.5 V
BUSY: 0 V
MUTE: 3.2 V
TX: 3.2 V
BUSY: 3.4 V
MUTE: 0 V
TX: 0 V
RX: 4.8 V
TX: 0 V
RX: 1.4 V
TX: 0 V RX: 2.8 V
TX: 0 V
RX: 0.7 V
–2.2 dBµV emf
TX: 0 V
RX: 2.8 V
TX: 0 V
5.0 V
SAVE ON: 0 V
SAVE OFF: 4.9 V
TX: 0 V
4.2 V
RX [W]: 1.1 V
RX [N]: 0.1 V
TX: 0 V
SAVE ON: 0 V
RX: 3.8 V
SAVE OFF: 3.2 V RX [W]: 0.6 V
TX: 4.2 V
TX: 0 V RX [N]: 0.8 V RX [W]: 0 V
TX [W]: 0 V RX [N]: 1.3 V
TX [N]: 0.8 V
TX: 0 V
RX: 4.1 V
TX: 3.9 V
RX: 3.2 V
TX: 2.8 V
3.5 V
RX: 2.6 V
TX: 1.6 V
PLL LOCK: 3.4 V
PLL UNLOCK: 0 V
RX: 2.7 V
TX: 0 V
SAVE ON: 2.0 V
RX: 0 V
SAVE OFF: 0 V
TX: 5.0 V
2.3 V
0.8 V
0 V
SAVE ON: 1.5 V
SAVE ON: 0 V
SAVE OFF: 0.7 V
SAVE OFF: 1.2 V
TX: 0 V
SAVE ON: 3.5 V
SAVE OFF: 0.6 V
7.4 V
5.0 V
LED ON: 4.4 V
LED OFF: 4.6 V
6.7 V
PWR ON: 3.6 V
3.5 V
PWR OFF: 0 V
RX: 2.7 V
TX: 0.7 V
PWR ON: 3.3 V PWR OFF: 3.5 V
PWR OFF: 3.5 V CLOCK SHIFT ON: 1.7 V
CLOCK SHIFT OFF: 1.9 V
PWR OFF: 3.5 V
CLOCK SHIFT ON: 1.7 V
CLOCK SHIFT OFF: 1.8 V
PWR ON: 3.9 V
PWR OFF: 4.1 V PWR OFF: 1.4 V
CLOCK SHIFT ON: 1.3 V
5.1 V CLOCK SHIFT OFF: 3.0 V
PWR ON: 5.6 V
PWR OFF: 5.7 V
3.5 V
PWR ON: 3.5 V
PWR OFF: 0 V
7.4 V
PWR ON: 3.2 V
PWR OFF: 0 V

Main Unit

Circuit Diagram
RX: 4.9 V
TX: 0 V
RX: 2.9 V
RX: 0.7 V
TX: 0 V
TX: 0 V
RX: 3.2 V
TX: 0 V
RX: 0.4 V
TX: 0 V
RX: 3.9 V
0 V
TX: 0 V
RX: 1.3 V
TX: 0 V
RX [W]: 0.6 V RX [W]: 3.4 V
RX [N]: 0.8 V RX [N]: 0 V
TX [W]: 0 V TX: 0 V
TX [N]: 0.8 V
0 V
RX [W]: 0 V
RX [N]: 2.9 V
TX: 0 V
3.5 V
1.7 V
PWR ON: 7.4 V
PWR OFF: 0 V
LED ON: 3.2 V
LED OFF: 0 V
LED HI: 3.2 V
LED LOW: 0 V
LED OFF: 0 V
RX: 0 V
TX: 3.3 V
RX [W]: 0 V
RX [N]: 3.2 V
15