Doosan DX700LC Operation And Maintenance Manual page 98

11. Preheating Indicator Light
In cold weather this light indicates that the engine preheat
function is operating.
When this indicator light turns "OFF", it means that the
engine preheat cycle has been completed.
12. Work Light Indicator Light
The indicator light indicates that the work lights are turned
"ON".
Operating Controls
2-26
Figure 51
Figure 52
HAAE2000
HB4O2003
OP001121