Fault Phenomenon: SANY SR235 rotary drilling rig instrument displays incorrect or no mast angle data.

Troubleshooting Process:
– Checked sensor: potentiometer worn open circuit.
– Checked harness: harness worn, short to ground.
– Checked connection: sensor linkage detached.
– Checked power supply: 24V supply missing.

Root Cause: The internal potentiometer of the mast angle sensor is worn and open circuit, or the harness is worn.

Required Parts: Replace mast angle sensor assembly or repair harness.