Vertex Standard VX-520U, Service Manual

Page: 21 / 52

21
CNTL Unit
2.5 V
2.5 V
2.2 V
RX: 0.9 V
RX: 1.0 V
TX: 0.4 V
RX: 0.9 V
RX: 0.8 V
RX: 0.8 V
7.2 V
LAMP on: 4.2 V
LAMP off: 0 V
5.0 V
5.0 V
RX: 5.0 V
TX: 5.0 V
0 V
TX: 5.0 V
W: 0 V
N: 5.0 V
RX: 0 V
TX: 5.0 V
SQL Open: 0 V
TX: 0 V
LAMP on: 5.0 V
LAMP off: 0 V
RX: 2.0 V
TX: 1.9 V
RX: 5.0 V
TX: 0 V
5.0 V
5.0 V
5.0 V
0 V
5.0 V 5.0 V TX L: 5.0 V TX H: 0 V
RX: 5.0 V TX: 0 V
RX: 0 V
TX: 0.3 V
RX: 0 V
TX: 5.0 V
5.0 V
5.0 V
5.0 V
5.0 V
5.0 V
5.0 V
5.0 V
5.0 V
RX: 0 V
TX: 1.8 V
2.5 V 2.5 V
SQL Close: 0 V
SQL Open: 4.2 V
TX: 1.9 V
TX: 1.9 V
RX: 0 V
TX: 2.0 V
RX: 0 V
TX: 1.9 V
TX: 1.9 V
RX: 0.1 V
TX: 0.4 V
RX: 5.0 V
TX: 0 V
5.0 V
RX: 0 V
TX: 5.0 V
Circuit Diagram