Vertex Standard VX-4200 Series Service Manual page 45

RX: 0 V RX: 5.0 V
TX: 5.0 V TX: 0 V
NORMAL: 0 V
EMERGENCY MIC: 5.0 V
HOOK OFF: 5.0 V
HOOK ON: 0 V
RX: 5.0 V
TX: 0 V
13.6 V
FRONT-C Unit (VX-4100: Lot. 1~5)
Circuit Diagram
8.6 V 5.0 V
I-1