Compaq Deskpro 2000 Series of Personal Computers
4-1
chapter
4
R
EMOVAL AND
R
EPLACEMENT
P
RELIMINARIES
This chapter provides general service information for the computer. Adherence to the procedures and
precautions described in this chapter is essential for proper service.
4.1 Electrostatic Discharge Information
A sudden discharge of static electricity from your finger or other conductor can destroy static-
sensitive devices or microcircuitry. Often the spark is neither felt nor heard, but damage occurs. An
electronic device exposed to electrostatic discharge (ESD) may not be affected at all and can work
perfectly throughout a normal cycle. The device may function normally for a while, then degrade in
the internal layers, reducing its life expectancy.
Networks built into many integrated circuits provide some protection, but in many cases, the
discharge contains enough power to alter device parameters or melt silicon junctions.
4.1.1 Generating
Static
Table 4-1 shows how different activities generate static electricity at different electrostatic voltage
levels.
Table 4-1
Typical Electrostatic Voltages
Relative Humidity
Event
10%
40%
55%
Walking across carpet
35,000 V
15,000 V
7,500 V
Walking across vinyl floor
12,000 V
5,000 V
3,000 V
Motions of bench worker
6,000 V
800 V
400 V
Removing DIPs* from plastic tube
2,000 V
700 V
400 V
Removing DIPs* from vinyl tray
11,500 V
4,000 V
2,000 V
Removing DIPs* from Styrofoam
14,500 V
5,000 V
3,500 V
Removing bubble pack from PCB
26,500 V
20,000 V
7,000 V
Packing PCBs in foam-lined box
21,000 V
11,000 V
5,000 V
*Dual Inline Packaging (DIP) is the packaging around individual microcircuitry. These are then multi-packaged inside plastic
tubes, trays, or Styrofoam.
✎
700 volts can degrade a product.
Summary of Contents for 244100-005 - Deskpro 2000 - 16 MB RAM
Page 2: ...278041 001 278785 002 ...
Page 4: ...CPS ...
Page 67: ...3 2 Illustrated Parts Catalog 3 1 System Unit Figure 3 2 System Unit Desktop ...
Page 69: ...3 4 Illustrated Parts Catalog Figure 3 3 System Unit Minitower ...
Page 71: ...3 6 Illustrated Parts Catalog 3 2 Mass Storage Devices Figure 3 4 Mass Storage Devices ...
Page 73: ...3 8 Illustrated Parts Catalog 3 3 Cables Figure 3 5 Cables ...
Page 75: ...3 10 Illustrated Parts Catalog 3 4 Standard and Optional Boards Figure 3 6 Optional Boards ...
Page 81: ...3 16 Illustrated Parts Catalog 3 6 Monitors Figure 3 9 Monitors ...
