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Check parameter 4077 (orientation timeout) - typical value is 5000ms. Verify spindle reaches orient position within this time.

Monitor the SPOS (spindle position arrival) signal on the PMC ladder or I/O diagnostics screen during manual orient command (M19). Signal should activate when orientation completes.

Inspect the spindle orientation sensor (magnetic pickup or encoder) for damage, contamination, or loose connections. Clean sensor face and verify air gap is 0.5-1.0mm.

Ensure spindle is completely stopped before inspecting orientation components

Check spindle amplifier orientation parameters (varies by model): SP-AMP check parameter 4960-4969 range. Verify orientation speed and gain settings match machine specifications.

Verify hydraulic/pneumatic pressure at the drawbar cylinder - should be 5-6 bar (pneumatic) or per machine spec (hydraulic). Check for leaks and test manual override if equipped.

Depressurize system and lock out machine before inspecting hydraulic/pneumatic components

Monitor tool clamp (TCL) and unclamp (TUNC) signals on PMC I/O screen during M6 tool change. Signals should toggle appropriately - only one active at a time.

Inspect drawbar proximity switches for proper mounting (typically 0.5-2mm sensing distance). Clean switch faces and verify wiring connections at switch and junction boxes.

Check PMC ladder logic for tool change sequence (typically around address F-code or G-code function blocks). Verify timer values for clamp/unclamp dwell times are not too short - typical is 0.5-1.5 seconds.

Verify Z-axis is at correct tool change position by checking machine position display. Reference point (G28) should be established - alarm 090 or 091 indicates lost reference.

Confirm spindle zero speed signal (SZERO or SP-ZERO) is active on PMC diagnostics before tool change initiation. Faulty encoder or speed detection can prevent this signal.

Check ATC magazine positioning - verify magazine index complete signal is active. Manually jog magazine if equipped with MPG mode and verify proper indexing and locking.

Ensure spindle and all axes are stationary before manual ATC operations

Review parameters 6030-6039 (tool change position settings) and verify they match machine mechanical specifications. Incorrect reference position can cause sequence timing issues.