Vertex VX-920 Series - Main Unit

15
Main Unit
VX-920/-920E VHF series Service Manual
Circuit Diagram
RX: 0.8 V
TX: 0 V
RX: 2.6 V
TX: 0 V
0 V
RX: 7.4 V
TX: 7.2 V
RX: 0 V
TX: 3.0 V
RX: 7.4 V
TX: 7.2 V
RX: 0 V
TX: 1.4 V
PWR ON: 7.4 V
PWR OFF: 0 V
RX: 0 V
TX: 3.0 V
RX: 0 V
TX: 4.3 V
RX: 0 V
TX: 1.5 V
0 V
RX: 0 V
TX: 5.0 V
RX: 0 V
TX: 3.0 V
RX: 3.2 V
TX: 0 V
RX: 1.4 V
TX: 0 V
RX: 7.4 V
TX: 7.1 V
RX: 4.1 V
TX: 0 V
2.6 V @25 °C
PWR ON: 5.0 V
PWR OFF: 0 V
3.5 V
PWR ON: 1.7 V
PWR OFF: 0 V
SAVE ON: 0 V
SAVE OFF: 3.2 V
TX: 0 V
PWR ON: 0 V
PWR OFF: 7.4 V
PWR ON: 5.0 V
PWR OFF: 0 V
RX: 7.4 V
TX: 6.8 V
RX: 7.4 V
TX: 7.2 V
RX: 0 V
TX: 5.0 V
RX: 5.1 V
TX: 4.4 V
RX: 5.1 V
TX: 0.1 V
RX: 0.1 V
TX: 3.3 V
7.4 V
[
A
]
: 3.5 V
[
Center
]
: 1.8 V
[
B
]
: 0 V
SW ON: 0 V
SW OFF: 3.6 V
SW ON: 0 V
SW OFF: 3.6 V
SW ON: 0 V
SW OFF: 3.6 V
SW ON: 0 V
SW OFF: 3.6 V
MUTE: 0.9 V
BUSY: 3.4 V
TX: 3.4 V
MUTE: 3.3 V
BUSY: 0.6 V
TX: 0.6 V
3.5 V
5.0 V
RX: –4.8 V
TX: –5.0 V
RX: –1.7 V
TX: –0.9 V
RX: 2.8 V
TX: 0 V
RX: 0 V
TX: 2.9 V
RX: 2.1 V
TX: 2.2 V
RX: 0.7 V
TX: 0.8 V
0.2 V
RX: 2.5 V
TX: 0.7 V
3.5 V
RX: –1.3 V
TX: –0.5 V
RX: –4.1 V
TX: –4.6 V
RX: 0.1 V
TX: 3.3 V
RX: 3.4 V
TX: –4.5 V
0.1 V
2.2 V
0.8 V
RX MAIN: 0 V
RX SUB: 2.7 V
TX: –0.5 V
RX MAIN: 2.7 V
RX SUB: 0 V
TX: 0 V
RX: 2.0 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: –3.3 V
TX: 0.2 V
RX: 3.8 V
TX: 4.2 V
4.2 V
RX: 4.1 V
TX: 3.9 V
RX: 3.2 V
TX: 2.8 V
RX: 2.8 V
TX: 2.3 V
RX: 2.7 V
TX: 0 V
RX: 0 V
TX: 5.0 V
RX: –4.0 V
TX: 0 V
RX: –4.1 V
TX: –4.6 V
0.8 V
2.3 V
0 V
3.5 V
SAVE ON: 0 V
SAVE OFF: 3.5 V
SAVE ON: 3.5 V
SAVE OFF: 0.6 V
RX: 2.8 V
TX: 0 V
RX: 1.4 V
TX: 0 V
RX: 0.7 V
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
SAVE ON: 0 V
SAVE OFF: 3.2 V
TX: 0 V
RX: 4.9 V
TX: 0 V
RX: 4.8 V
TX: 0 V
RX: 0.4 V
TX: 0 V
RX: 2.9 V
TX: 0 V
0 V
RX: 3.2 V
TX: 0 V
RX: 3.9 V
TX: 0 V
RX: 1.3 V
TX: 0 V
RX: 0.7 V
TX: 0 V
RX
[
W
]
: 3.4 V
RX
[
N
]
: 0 V
TX: 0 V
RX
[
W
]
: 0 V
RX
[
N
]
: 2.9 V
TX: 0 V
0 V
RX
[
W
]
: 0.6 V
RX
[
N
]
: 0.8 V
TX
[
W
]
: 0 V
TX
[
N
]
: 0.8 V
RX
[
W
]
: 0.6 V
RX
[
N
]
: 0.8 V
TX
[
W
]
: 0 V
TX
[
N
]
: 0.8 V
RX
[
W
]
: 1.1 V
RX
[
N
]
: 0.1 V
TX: 0 V
RX
[
W
]
: 0 V
RX
[
N
]
: 1.3 V
TX: 0 V
3.5 V
1.7 V
3.5 V
RX: 2.6 V
TX: 1.6 V
SAVE ON: 0 V
SAVE OFF: 1.2 V
TX: 0 V
SAVE ON: 2.0 V
SAVE OFF: 0 V
SAVE ON: 1.5 V
SAVE OFF: 0.7 V
PLL LOCK: 3.4 V
PLL UNLOCK: 0 V
LED ON: 4.4 V
LED OFF: 4.6 V
5.0 V
7.4 V
RX: 0 V
TX: 5.0 V
RX: 0.9 V
TX: 3.4 V
5.0 V
CLOCK SHIFT ON: 1.3 V
CLOCK SHIFT OFF: 3.0 V
CLOCK SHIFT ON: 0.6 V
CLOCK SHIFT OFF: 0.7 V
CLOCK SHIFT ON: 0.8 V
CLOCK SHIFT OFF: 0.7 V
6.7 V
3.5 V
PWR ON: 7.4 V
PWR OFF: 0 V
PWR ON: 3.6 V
PWR OFF: 0 V
RX: 2.7 V
TX: 0.7 V
RX: 0 V
TX: 3.3 V
RX
[
W
]
: 0 V
RX
[
N
]
: 3.2 V
LED HI: 3.2 V
LED LOW: 0 V
LED OFF: 0 V
LED ON: 3.2 V
LED OFF: 0 V
PWR ON: 3.3 V
PWR OFF: 3.5 V
PWR ON: 3.9 V
PWR OFF: 4.1 V
PWR ON: 5.6 V
PWR OFF: 5.7 V
5.1 V
PWR ON: 3.5 V
PWR OFF: 0 V
3.5 V
7.4 V
PWR ON: 3.2 V
PWR OFF: 0 V
OPTION ON: 0 V
OPTION OFF: 3.3 V
3.5 V
3.5 V
BUSY: 0 V
MUTE: 3.2 V
TX: 3.2 V
BUSY: 3.4 V
MUTE: 0 V
TX: 0 V
BUSY: 1.4 V
MUTE: 7.4 V
TX: 7.4 V
BUSY: 7.4 V
MUTE: 0.6 V
TX: 0.6 V
3.5 V
7.4 V
7.4 V
3.5 V
3.5 V
RX: 3.1 V
TX: 3.5 V
RX: 2.7 V
TX: 0.7 V
INT: 1.9 V
EXT: 0 V
N/C MIC ON: 0 V
N/C MIC OFF: 3.3 V
N/C MIC ON: 0.7 V
N/C MIC OFF: 0 V
BUSY: 3.3 V
MUTE: 0 V
TX: 0 V
BUSY: 0.1 V
MUTE: 7.4 V
TX: 7.4 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



INT SP: 7.4 V
EXT BUSY: 0.6 V
EXT SP MUTE: 0.2 V
TX: 0.2 V
MUTE: 0.5 V
BUSY: 0.8 V
TX: 0.1 V
MUTE: 0.3 V
BUSY: 0.8 V
TX: 0.1 V

LED OFF: 2.8 ~ 3.3 V
LED LOW: 1.6 V
LED HI: 1.4 V

LED OFF: 2.7 ~ 3.3 V
LED LOW: 1.8 V
LED HI: 1.6 V

LED OFF: 3.5 ~ 3.3 V
LED LOW: 2.6 V
LED HI: 2.5 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 OFF: 1.4 V
CLOCK SHIFT ON: 1.3 V
CLOCK SHIFT OFF: 3.0 V
–7.0 dBμV emf
@154.1 MHz
–9.0 dBμV emf
@154.1 MHz
0.3 dBμV emf
@154.1 MHz
–2.2 dBμV emf
0.2 V p-p
0.1 V p-p
@0.7 W
0.1 V p-p
@0.7 W
9.3 V p-p
@0.7 W