Tip, cable and window: a five-minute check before the shift

A small dot on the optical window might be dust, product residue or damage to the coating; the distinction matters, but an extra pulse is certainly not the way to investigate it.

That is why a short pre-shift check exists. It does not prove calibration, replace service or turn a practitioner into an engineer. Its purpose is simpler: find a visible deviation before the device touches a client.

I recommend using the same five steps every time. If the answer becomes unclear at any step, the timer ends and treatment does not begin.

1. Identify the system and read the shift handover

First confirm the device in the room: model, internal equipment number, installed handpiece and intended mode. A similar-looking tip does not become compatible because the connector happens to fit.

Read the last log entry. An error may have repeated yesterday, a component may have been changed, or a service question may still be open.

The absence of a red label does not prove that the device has been formally returned to use.

The current user instructions or a short check card for this configuration should be available. If software, service work or a component change altered the process, the old card is no longer good enough.

This first step can already produce a stop: an unclear identifier, unresolved error, unknown tip or missing confirmation after service.

2. Look at the space, power and accessible cables

Walk around the device before switching it on. There should be no liquid, unstable object or obstruction around ventilation and the emergency control. A fresh impact mark, smell of overheating or soot needs further assessment.

Inspect the accessible length of the power cable without pulling or sharply bending it. Look for damaged insulation, flattening, discolouration, an exposed section or a deformed plug. The cable should not sit under a wheel or cross a wet area.

Then follow the hose, working cable or fibre towards the handpiece. Look for knots, compression by furniture, a sharp bend, cut, swelling or a damaged entry point at the machine or handpiece. Do not rock or pull a connector to “make sure it holds”.

The practitioner does not apply tape, add an improvised extension or open the housing. The inspection ends where repair begins.

3. Inspect the handpiece, tip and optical window

Check that the handpiece sits securely in its holder and look for evidence of a fall.

Then inspect the body, seams, markings and accessible connection. A crack, chip, looseness, dent, sticky surface or misalignment is an observation to record, not a diagnosis the practitioner must make.

Match the tip to the instructions and its markings. It should belong to this configuration, sit as designed and have no tape, packing or force holding it in place. A clean but cracked tip is still defective.

View the optical window in good light without touching it with a finger. Look for dust, hair, film, clouding, a scratch, dot, chip or crack. Where user cleaning is permitted, use only the material and product specified.

Inspect it again after cleaning. If the dot remains, do not press harder, scrape or try a household chemical. An unidentified mark remains questionable until the responsible technical route assesses it.

4. Check cooling and normal start-up exactly as instructed

Inspect only the cooling parts and consumables assigned to the user check. A misaligned connection, compressed hose, damaged contact surface, wrong consumable or system warning is not repaired by improvisation.

Carry out the normal start-up and self-test. Read the complete screen message. Restart only where the instructions explicitly permit it for that message. A recurring error does not become normal because it disappears on the third attempt.

A green indicator does not cancel a visible crack, and a cold sensation does not prove that the complete cooling system is working. A self-test confirms only what the manufacturer designed it to test.

Stop the process. Nothing is “checked again” on a client after start-up produces an unusual sound, smell, unstable cooling or an unknown code.

5. Isolate the questionable system and hand over the observation

A crack, cable damage, questionable window, unstable cooling, repeated error or unknown configuration takes the device out of use under the studio’s current procedure.

The label should clearly state that the equipment must not be used. Record the model and unit number, component, time, person checking and the observation itself: for example, “cable sheath cut 20 cm from the handpiece”, not “broken fibre”.

Tell the responsible person and the next shift.

A quiet log entry is not enough if a colleague is already preparing the room. Only the role authorised by the studio’s process should remove the restriction after the required technical check.

Five minutes is not a rule for every model. It is a useful rhythm for a familiar system in normal condition. If a question needs longer, the schedule waits.

A good pre-shift inspection does not end with proof that the practitioner can repair a laser. It ends with a small defect noticed, described, isolated and handed over before it becomes the client’s problem.