Quickie Rhythm, Technical & Service Manual

Page: 13 / 182

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©2006 Sunrise Medical
INTRODUCTION
To help prevent Electro Static Discharge (ESD) the following proper handling
techniques should be followed:
ESD :
Do not place Printed Circuit Boards or their containers near sources of strong •
electrical fi elds (such as above a CRT).
To avoid the occurrence of static charge or discharge due to friction, keep •
the Printed Circuit Boards separate from one another and do not stack them
directly on top of one another if not protected by antistatic bags.
Store each Printed Circuit Board in an antistatic bag with an external cush-
•
ioning bubble-wrap layer until assembled to wheelchair. Antistatic bag must
have metal content to protect the printed circuit board. Gray bag protects
from ESD, pink bag or bubble wrap does not protect as well.
Always wear an ESD preventive wrist or ankle strap when handling electronic
•
components. Connect one end of the strap to an ESD jack or an unpainted
metal component on the system (such as a captive installation screw).
Handle Printed Circuit Boards by the edges only; avoid touching the Printed
•
Circuit Board and connector pins.
Place any removed Printed Circuit Board on an antistatic surface or in a static
•
shielding bag.
Avoid contact between the Printed Circuit Boards and clothing. The wrist
•
strap only protects the card from ESD voltages on the body; ESD voltages
on clothing can still cause damage.
Make sure that the Printed Circuit Board power is off by disconnecting the
•
seating harness prior to attaching or removing printed circuit board.
Printed Circuit Board Flexing:
The printed circuit board has surface-mount components that may break •
when the board is fl exed. To minimize the amount of board fl exing, observe
the following precautions:
Hold the printed circuit board only by the edges.
•
Do not place the printed circuit board on a hard surface. •
Tighten board mounting screws only hand tight (torque12.4 in lbs/1.4Nm) in a •
cross pattern to reduce stress on mounting holes and PCB board material.
Electro Static Discharge