What situations require on-site service 
When the user is unable to solve the on-site problem based on the operation manual provided by our company. 
After telephone consultation, it was found that the on-site issue could not be resolved under the guidance of our service engineer. 
Due to limitations in on-site installation and production processes, it is not possible to remove the faulty instrument for repair. 
What information needs to be prepared before requesting on-site service? 
End users of Cologne company products (city, province, contact person, phone number, etc.) 
Basic information of the product (model, instrument number, purchase time, usage time) 
Product on-site usage issues/malfunctions