What actually stopped this sleeve-unloading job?

The operator says there was no collision message. He used that term because the arm stopped near the tray. I have removed it from the ticket's confirmed facts.

Good. Which program step was active? Even knowing whether it was waiting for something or executing a move would help

The saved screenshot shows a wait in the application. It is waiting for a tray-present condition, after the previous tray was removed.

Then start at that condition. Ask who supplies it and what the application actually received at the time

We once chased a robot pause that was a sticky fixture confirmation. Was the replacement tray fully located when the operator took the video, or merely sitting somewhere in the loading area?

He believes it was located. The camera does not show the stops or latch, so I cannot verify that from the recording.

Keep his observation, just label it as his observation. It may be right; the missing camera angle doesn't make it false

Our relief shift was parking trays against the wrong stop after cleaning. Photograph the intended seated position for the report. It also gives whoever takes the next shift a useful reference.

And compare that with the actual locator arrangement. A photo from before a tooling change can be worse than no photo

Don't go straight from this to blaming the operator. You're still missing the input history, and the tray could be seated with the signal absent.

Agreed. We have a wait condition to investigate, not a culprit. The physical seating and reported input both need checking

Maintenance found the current input name and traced it to the tray latch sensor. They will inspect that assembly during the planned stop. No input is being bypassed to get past the wait.

Have they found anything yet? The sensor name at least gives the seller's controls person something specific to follow

Also ask whether the latch has more than one physical position that feels closed. Ours had enough play to fool your hand while the sensor still said no (not the operator's fault).

Maintenance has found play in the latch bracket. It can feel seated before the sensor changes. They are checking the correct bracket position against the tooling documentation before repair.

The seller's controls contact now has the wait step, input name and bracket photographs. Repair and verification are pending. The original collision diagnosis had no basis in the records.

That's a much better ticket. Let the bracket check finish before closing it; finding a plausible fault isn't yet a clean run