Attention: 1. The printhead is required to be installed by professional persons. 2. Due to the nature of printer parts and the many factors that go into installing them, we do not accept returns or give refunds on electronic or service parts. Once the package is delivered, it is the customer's responsibility to check the package for damage. If there is any visible damage on the package, please refuse the shipment and call us at +86(10) 63705868 ext 607 3. Please seriously pay attention on information of printhead model while purchasing from us. Once received your item, please inspect if the printhead matches up with the model you required.If you have any problems, it is very important that contact us as soon as possible before installing it onto machine. Please be aware that we don't accept any return and refund once the printhead is installed on the machine.