Compaq Presario 1200xl Series.pdf

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Presario 1200XL Series
Model XL300, XL300A, and XL300B
Removal Sequence
This chapter provides details for removing and replacing each component of the Presario
1200XL units.
Electrostatic Discharge
When removing or replacing parts, be careful to discharge static electricity before touching
the internal Notebook components. A sudden discharge of static electricity from a finger or
other conductor can destroy static-sensitive devices and microcircuitry. Often the spark is
neither felt nor heard, but damage occurs. An electronic device exposed to an electrostatic
discharge may not seem to be affected and continue to work perfectly throughout a normal
cycle. However, the discharge degrades internal layers, which reduces the operating life of
the device. 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.
The table below shows the amount of static electricity generated by common activities
associated with servicing computers.
Electrostatic Voltage
Relative Humidity
10% 40% 50%
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
Motion of bench worker 6,000 V 800 V 400 V
Removing DIPS from plastic tubes 2,000 V 700 V 400 V
Removing DIPS from vinyl trays 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 PCBs 26,000 V 20,000 V 7,000 V
Packing PCBs in foam-lined box
21,000 V 11,000 V 5,000 V
Ä
CAUTION: As little as 700 Volts can degrade Notebook components. Be sure to
ground yourself before touching the Notebook or its subassemblies.
P RESARIO N OTEBOOK M AINTENANCE AND S ERVICE G UIDE 1200XL S ERIES
R EMOVAL S EQUENCE 1
Event
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Presario 1200XL Series
Model XL300, XL300A, and XL300B
Tool and Software Requirements
The following items are required to service the Notebook:
•
Torx T-9 screwdriver
•
5mm nut drivers (for screwlocks and standoffs)
•
Small standard screwdriver
•
Small Phillips screwdriver
•
Diagnostics software
Screws
The screws used in the Notebook are not interchangeable. If an incorrect screw is used
during the reassembly process, it can damage the unit. Compaq strongly recommends that
all screws removed during disassembly be kept with the part that was removed, then
returned to their proper locations.
Important: As each subassembly is removed from the Notebook, place it away from the
work area to prevent damage.
Connectors and Plastic Parts
Plastic parts can be damaged by the use of excessive force during disassembly and
reassembly. When handling plastic parts, use care. Apply pressure only at the points
designated in the instructions. Most of the connectors in these Notebooks are
2 R EMOVAL S EQUENCE
P RESARIO N OTEBOOK M AINTENANCE AND S ERVICE G UIDE 1200XL S ERIES
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Presario 1200XL Series
Model XL300, XL300A, and XL300B
ZIF Connector
The 1200XL Series Notebooks use zero insertion force (ZIF) connectors on the system
board.
Ä
CAUTION: A ZIF connector and its attached cable can be easily damaged. Handle
only the connector slide when removing or replacing a cable. Never pull or twist on
the cable while it is connected.
To remove a cable from a ZIF connector, lift both corners of the ZIF connector and slide the
cable out simultaneously with constant light pressure.
Ä
CAUTION: When servicing this Notebook, ensure that cables are placed in their
proper location during the reassembly process. Improper cable placement can
damage the Notebook.
P RESARIO N OTEBOOK M AINTENANCE AND S ERVICE G UIDE 1200XL S ERIES
R EMOVAL S EQUENCE 3
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Presario 1200XL Series
Model XL300, XL300A, and XL300B
Cables
Most cables used throughout the unit are ribbon cables.
Cables must be handled with extreme care to avoid damage. Use the following precautions
when handling cables to avoid damage to the cable and the Notebook:
•
Always handle cables by their connectors.
•
In all cases avoid bending, twisting, pulling, or tearing cables.
•
Apply only the minimum pressure required to seat or unseat cables from their
connectors.
•
Place the cables so that they are not caught or snagged by parts being removed or
replaced.
•
Handle flex cables with extreme care; they can tear easily.
Ä
CAUTION: When servicing these Notebooks, ensure that cables are placed in their
proper location during the reassembly process. Improper cable placement can
cause severe damage to the unit.
The following illustrations show the proper placement for each cable:
•
•
•
•
4 R EMOVAL S EQUENCE
P RESARIO N OTEBOOK M AINTENANCE AND S ERVICE G UIDE 1200XL S ERIES
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Presario 1200XL Series
Model XL300, XL300A, and XL300B
Diskette Drive Ribbon Cable
The ribbon cable position for the diskette drive is shown below.
Ä
CAUTION: When servicing this Notebook, ensure that cables are placed in their
proper location during the reassembly process. Improper cable placement can
damage the Notebook.
P RESARIO N OTEBOOK M AINTENANCE AND S ERVICE G UIDE 1200XL S ERIES
R EMOVAL S EQUENCE 5
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