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Manually jog spindle to orient position using MDI command (M19 or M119 depending on system). Observe if orientation completes successfully and if alarm clears.

Check spindle orientation sensor (proximity switch or encoder marker) for proper gap (typically 0.5-2mm), damage, or contamination. Clean sensor face and target surface with non-residue cleaner.

Ensure spindle power is OFF before cleaning sensors near rotating components.

Verify orientation sensor signal at spindle drive or I/O using ladder diagram or PMC diagnostics. Confirm signal changes state when spindle rotates through orient position.

Check spindle orientation parameters (1410-1419 series) for correct orientation angle, speed, and timeout values. Compare with machine manufacturer specifications and adjust if necessary.

Check hydraulic or pneumatic pressure gauge at spindle drawbar actuator. Verify pressure meets specification (typically 20-30 bar for hydraulic, 5-6 bar for pneumatic systems).

Release spindle pressure slowly and ensure no tool is loosely held in spindle before testing.

Inspect drawbar unclamped and clamped limit switches (proximity sensors or mechanical switches) for proper operation. Manually actuate drawbar and verify signal changes in PMC ladder or diagnostic screen.

Check drawbar Belleville spring stack for loss of tension, contamination with chips or coolant causing binding, or mechanical damage. Clean and lubricate drawbar bore with specified grease if binding is evident.

Lock out spindle power and tag machine before accessing spindle drawbar components.

Verify ATC time limit parameters (6165, 6166 for unclamp/clamp delays) are adequate. Increase timeout values by 0.5-1.0 seconds if mechanism operates slowly but completes successfully when tested manually.

Access PMC ladder diagnostics (SYSTEM > PMC > PMCDGN) and monitor ATC-related signals during manual tool change operation. Identify which specific signal (orient complete, unclamp confirm, clamp confirm) is not changing state.

Trace faulty signal from sensor/solenoid back to I/O module. Check voltage at sensor output and module input using multimeter. Verify 24VDC present for NPN sensors or 0V for PNP sensors when activated.

Use proper meter settings and avoid shorting circuits when back-probing connectors.

Inspect connectors at spindle head (slip ring or cable bundle) for loose pins, corrosion, or coolant intrusion. Clean with contact cleaner and ensure positive connection engagement.

If solenoid outputs are commanded but valves do not actuate, measure coil resistance (typically 20-200 ohms) and verify output voltage at valve connector reaches 24VDC. Replace failed solenoid or I/O module as needed.