FUJITSU MAP3735FC - Manual (Page 84)

Diagnostics and Maintenance
6-6 C141-E163
1. Always ground yourself with a wrist strap connected to ground before
handling. ESD (Electrostatics Discharge) may cause the damage to the
device.
2. Do not remove a PCA.
3. Do not use a conductive cleaner to clean a disk drive assembly.
6.2.2 Maintenance requirements
(1) Preventive maintenance
Preventive maintenance such as replacing air filters is not required.
Damage
Never open the disk enclosure in the field. Opening the disk enclosure
in the field may cause an irreparable fault.
(2) Service life
See "(3) Service life," in Section 2.1.5.