HP Compaq dc7800 User Manual

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 appear to be affected at all and can work
perfectly throughout a normal cycle. The device may function normally for a while, but it has been
degraded 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.
Generating Static
The following table shows that:
●
Different activities generate different amounts of static electricity.
●
Static electricity increases as humidity decreases.
Relative Humidity
Event
55% 40% 10%
Walking across carpet
Walking across vinyl floor
Motions of bench worker
Removing DIPs from plastic tube
7,500 V
3,000 V
400 V
400 V
15,000 V
5,000 V
800 V
700 V
35,000 V
12,000 V
6,000 V
2,000 V
Removing DIPs from vinyl tray
Removing DIPs from Styrofoam
Removing bubble pack from PCB
Packing PCBs in foam-lined box
2,000 V
3,500 V
7,000 V
5,000 V
4,000 V
5,000 V
20,000 V
11,000 V
11,500 V
14,500 V
26,500 V
21,000 V
These are then multi-packaged inside plastic tubes, trays, or Styrofoam.
NOTE: 700 volts can degrade a product.
Preventing Electrostatic Damage to Equipment
Many electronic components are sensitive to ESD. Circuitry design and structure determine the degree
of sensitivity. The following packaging and grounding precautions are necessary to prevent damage to
electric components and accessories.
●
To avoid hand contact, transport products in static-safe containers such as tubes, bags, or boxes.
●
Protect all electrostatic parts and assemblies with conductive or approved containers or packaging.
●
Keep electrostatic sensitive parts in their containers until they arrive at static-free stations.
●
Place items on a grounded surface before removing them from their container.
●
Always be properly grounded when touching a sensitive component or assembly.
Electrostatic Discharge Information 53

HP Compaq dc7800 Specifications

General

Tcase	73.3 °C
Bus type	FSB
Stepping	M0
Processor cache	2 MB
Processor cores	2
Processor model	E4600
System bus rate	- GT/s
Processor family	Intel® Core™2 Duo
Processor series	Intel Core 2 Duo E4000 Series
Processor socket	LGA 775 (Socket T)
Processor codename	Conroe
Processing Die size	111 mm²
Processor frequency	2.4 GHz
Processor cache type	L2
Processor lithography	65 nm
Processor manufacturer	Intel
Processor front side bus	800 MHz
Processor operating modes	64-bit
ECC supported by processor	No
Thermal Design Power (TDP)	65 W
CPU multiplier (bus/core ratio)	12
Number of Processing Die Transistors	167 M
Internal memory	1 GB
Internal memory type	DDR2-SDRAM
Maximum internal memory	8 GB
Memory layout (slots x size)	2 x 0.5 GB
HDD speed	7200 RPM
HDD interface	SATA
Optical drive type	DVD Super Multi
Total storage capacity	160 GB
Audio input	1
LightScribe	Yes
Networking features	Intel 82566DM Gigabit Network Connection
Graphics card RAMDAC	400 MHz
Storage drive controller	SATA 3, 0 Gb/s NCQ SMART VI
Discrete graphics card model	Intel® GMA 3100
Maximum graphics card memory	0.256 GB
Operating system installed	Windows Vista Business
USB 2.0 ports quantity	8
Chassis type	Mini Tower
Country of origin	China
Cable lock slot type	Kensington
Operating altitude	0 - 3048 m
Non-operating altitude	0 - 9144 m
Storage temperature (T-T)	-30 - 60 °C
Operating temperature (T-T)	10 - 35 °C
Storage relative humidity (H-H)	5 - 95 %
Operating relative humidity (H-H)	10 - 90 %
Power supply	365 W
Product type	PC
Processor code	SLA94
Processor ARK ID	32242
Processor package size	37.5 x 37.5 mm

Weight and Dimensions

Depth	452 mm
Width	177 mm
Height	447 mm
Weight	11800 g