INTRODUCTION
Page iv
Effective
09/2005
ELECTRICAL SAFETY PRECAUTIONS
Make sure the balancer is unplugged before disconnecting any wires in preparation for replacing any
boards, cables or other items within the unit. Use the
“Lockout and/or Tagout”
procedure.
SERVICE GUIDELINES / HANDLING STATIC SENSITIVE PCB’S
Electrostatic discharge can destroy high impedance ICs if uncontrolled. Use the fol-
lowing techniques to avoid damaging ICs:
- Leave new circuit boards in their antistatic bags until ready for use.
- When replacing boards, proms, etc. be sure to turn off power to the machine first
- Use an anti-static wrist strap. Connect it to chassis ground on the equipment or to an available raw ground.
- Touch the chassis of the equipment to put yourself at the same static potential as the equipment.
- Grasp the PCB from opposite sides using your fingertips. Do not grasp the components on the board.
!
When inserting PCB’s:
-
Place boards on a grounded static mat after removal.
-
Remove the new PCB from the original package onto a grounded static mat. Save packaging to use
when returning defective boards.
-
Remove power from the machine (un-plug from wall) before installing the PCB.
-
Avoid handling components needlessly.
-
Do not set PCBs on insulating surfaces such as paper, glass, rubber, or plastic.
-
Static is generated by friction. The following actions promote static generation:
-
Wearing silk or nylon clothing.
-
Walking on carpets.
-
Walking with rubber soled shoes.
Static generation is increased when certain environmental conditions exist. Conditions of low humidity
combined with wearing silks or nylons, walking on carpets, or walking with rubber soled shoes may create
large electrostatic charges on your person, capable of blowing a hole in the substrate of an IC.
