According to your description, I suggest you refer to the following information:
1. It is suggested that you can contact your local HP Gold Service Center to help you clean the machine dust. As the maintenance cost is managed by HP Gold Service Center, it is suggested that you can call the staff there in advance to get the specific cost information.
2. The following is the contact information of HP Gold Service Center in Chaoyang District, Beijing. You can choose the right HP Gold Service Center according to your own needs.
(1) Address: F 1-9, Chen Rui International Center, 200m east of Changhong Bridge, Chaoyang District, Beijing.
Tel: 010-65016166.
(2) Address: Room 420, No.8 Dongdaqiao Road, Chaoyang District, Beijing,11 12, 10 1 200.
Tel: 0 10-58700645
3. Tips:
If you want to check the HP Gold Service Center in other cities, you can check the nearest HP Gold Service Center through the following website:
/zh/support-drivers/e support/as CPPS . html
I hope the above reply can help you.
If the above information can't solve your problem, you can log on to www.hp.com.cn/chat,, the online chat room of HP Network, and ask an online engineer to help you solve the problem further. More product information is available in www.hp.com.cn/800..