# One device, two faults — Peltier module replacement and Nd:YAG laser repair HTML source: [One device, two faults — Peltier module replacement and Nd:YAG laser repair](https://lasertechservice.pl/en/case-studies/peltier-replacement-nd-yag-laser-repair/) Language: English Other language version: [Polski](https://lasertechservice.pl/realizacje/wymiana-peltiera-naprawa-lasera-nd-yag/), [Русский](https://lasertechservice.pl/ru/realizacje/zamena-pelte-remont-lazera-nd-yag/) > Two independent faults in one device: Peltier module replacement, Nd:YAG handpiece repair and calibration. Work carried out by Laser Tech Service. Two independent faults in one device: Peltier module replacement, Nd:YAG handpiece repair and calibration. Work carried out by Laser Tech Service. ![Specialist wearing a Laser Tech Service shirt working on a dismantled Nd:YAG handpiece](https://lasertechservice.pl/img/realizacje/peltier-nd-yag/specjalista-laser-tech-service-naprawa-nd-yag.webp) **Equipment:** a multifunction aesthetic laser with two handpieces. **Work performed:** cooling system diagnostics, Peltier module replacement, Nd:YAG laser component replacement and laser calibration. ## Two faults in one device Laser Tech Service specialists carried out a comprehensive repair of a multifunction aesthetic device combining two technologies: laser hair removal and Nd:YAG for tattoo and pigmentation removal. Diagnostics identified two independent faults requiring repairs to both handpieces. ## First fault — Peltier module overheating The thermoelectric Peltier module responsible for cooling the contact surface had failed in the laser hair removal handpiece. During diagnostics, the specialists established the cause of overheating: the client had been connecting only one handpiece, although this model’s design required both to be connected simultaneously. The incorrect connection configuration disrupted cooling system operation and created conditions in which the thermoelectric module could overheat. **Work performed:** - Dismantling the laser hair removal handpiece. - Cooling system diagnostics. - Removal of the faulty Peltier module. - Installation of a new thermoelectric module. - Handpiece reassembly and cooling checks. - Verification that both handpieces were connected correctly. ## Second fault — a damaged Nd:YAG laser component The second problem was found in the Nd:YAG handpiece. Diagnostics showed that a laser component involved in generating laser radiation needed replacement. Laser Tech Service specialists dismantled the handpiece, removed the faulty component and installed a new laser component. The Nd:YAG laser was calibrated after replacement. Calibration is necessary for correct laser system operation following work on its optical section and allows operating parameters to be checked against the device’s requirements. **Work performed:** - Dismantling the Nd:YAG handpiece. - Removal of the faulty laser component. - Installation of a new component. - Laser handpiece reassembly. - Nd:YAG laser calibration. - Operational checks after repair. ## Repair result During a single service visit, Laser Tech Service specialists resolved two faults in different handpieces of the same device. The Peltier module was replaced in the hair removal handpiece; a laser component was replaced in the Nd:YAG handpiece, followed by calibration. An operating error was also identified: connecting only one handpiece instead of two. ## Technical conclusion In multifunction aesthetic equipment, correct handpiece connections can directly affect cooling system operation. Replacing a faulty part without addressing the cause of its failure creates a risk of recurrence. **Laser Tech Service** — diagnostics, repair and maintenance of aesthetic and medical lasers throughout Poland. ## Photographs of the service work ![Contact surface of a dismantled hair removal handpiece during servicing](https://lasertechservice.pl/img/realizacje/peltier-nd-yag/glowica-do-depilacji-powierzchnia-kontaktowa.webp) ![Device control panel displaying NDYAG LASER mode](https://lasertechservice.pl/img/realizacje/peltier-nd-yag/panel-aparatu-tryb-nd-yag.webp) ![Multifunction device with handpieces in the treatment room during servicing](https://lasertechservice.pl/img/realizacje/peltier-nd-yag/aparat-dwie-glowice-serwis.webp) ![Nd:YAG mode screen with energy and frequency fields](https://lasertechservice.pl/img/realizacje/peltier-nd-yag/ekran-nd-yag-energia-czestotliwosc.webp) ![Exposed wiring and components of the hair removal handpiece](https://lasertechservice.pl/img/realizacje/peltier-nd-yag/glowica-depilacja-odsloniete-przewody.webp) ![Technician wearing protective glasses working on an open Nd:YAG handpiece](https://lasertechservice.pl/img/realizacje/peltier-nd-yag/serwis-manipuly-nd-yag.webp) ![Interior of the hair removal handpiece housing with the assembly and wiring visible](https://lasertechservice.pl/img/realizacje/peltier-nd-yag/glowica-depilacja-wnetrze-obudowy.webp) ## Related resources and services - [More on causes and calibration](https://lasertechservice.pl/en/blog/handpiece-connections-overheating-nd-yag-calibration/) - [Diode laser diagnostics](https://lasertechservice.pl/en/services/diode-laser-diagnostics/) - [Handpiece and applicator refurbishment](https://lasertechservice.pl/en/services/laser-handpiece-repair/) - [Maintenance](https://lasertechservice.pl/en/blog/scheduled-diode-laser-maintenance/) ## Service offerings - [Professional laser and aesthetic equipment servicing](https://lasertechservice.pl/en/services/) - [Service pricing](https://lasertechservice.pl/en/pricing/) - [Technical Service for Beauty Salon Chains and Aesthetic Clinics](https://lasertechservice.pl/en/services/service-for-salon-chains/) - [Diode laser diagnostics](https://lasertechservice.pl/en/services/diode-laser-diagnostics/) - [Laser handpiece and applicator refurbishment](https://lasertechservice.pl/en/services/laser-handpiece-repair/) ## Related articles - [One device, two faults: how incorrect handpiece connections cause overheating and why an Nd:YAG laser needs calibration](https://lasertechservice.pl/en/blog/handpiece-connections-overheating-nd-yag-calibration/) - [Scheduled diode laser maintenance – why does it matter and what does it cover?](https://lasertechservice.pl/en/blog/scheduled-diode-laser-maintenance/)