DS8000 Service Documentation Version 7.5

ESD procedures

When you service this machine, always wear an electrostatic discharge (ESD) wrist strap that is properly connected to the rack frame or enclosure sheetmetal. This prevents possible damage to the hardware, and decreases any possible impact to customer operations.

Purpose

Following is a list of the ESD-sensitive parts in thestorage facility. Always wear the ESD wrist strap when you work on or touch any of these parts.

All logic FRUs (cards and planars)
All disk drives
Any cables connected to ESD-sensitive parts

See How to attach the ESD wrist strap.

To prevent damage when you work with ESD-sensitive parts, perform these instructions carefully.

Keep the ESD-sensitive part in a special ESD bag until you are ready to install the part into the machine.
Make the fewest possible movements with your body to prevent an increase of static electricity from clothing, fibers, carpets, and furniture.
If instructed to do so, switch off the machine power before you remove ESD-sensitive parts.
Just before touching the ESD-sensitive part, discharge to the machine any static electricity in your body by touching the metal frame or cover of the machine. If possible, keep one hand on the frame when you install or remove an ESD-sensitive part.
Never touch or work on any electronic circuits without wearing the ESD wrist strap.
Touching the logic board pins without wearing the ESD wrist strap (for example, while counting the pins) can cause logic card failures. Touching the voltmeter leads when you measure board pins or cable connections can also cause ESD damage.
Do not place any ESD-sensitive parts on the machine cover or on a metal table because large metal objects can become discharge paths if they are not grounded. If you must set aside an ESD-sensitive part, first place it into the special ESD bag.
Prevent ESD-sensitive parts from being accidentally touched by other personnel such as service support representatives or customers. Reinstall all covers when you are not working on the machine.
If possible, keep all ESD-sensitive parts in a grounded metal case.
Be very careful when you work with ESD-sensitive parts in cold weather. Low humidity and heating increase static electricity.