Compaq presario 1400 series User Manual

							PRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1400 SERIESREMOVAL SEQUENCE 17
Presario 1400 Series
Model XL240, XL241, XL242, XL244, XL245, XL246, XL247, XL250, XL340, 
XL341, XL342, XL343, XL344, XL345, XL346, XL350, XL352, XL355, and XL356
Electrostatic Discharge
A sudden discharge of static electricity from a 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 that has been exposed to electrostatic discharge (ESD) may not seem to be affected and 
work perfectly throughout a normal cycle. Although it may function normally for a period of time, it 
may have 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 table below shows activities that generate static electricity and their associated level of 
electrostatic voltage.
Typical Electrostatic Voltages
EventRelative Humidity
10% 40% 55%
Walking across carpet35,000 V15,000 V7,500 V
Walking across vinyl floor 12,000 V 5,000 V 3,000 V
Motions of bench worker6,000 V800 V400 V
Removing DIPS from plastic tubes 2,000 V 700 V 400 V
Removing DIPS from vinyl trays11,500 V4,000 V2,000 V
Removing DIPS from Styrofoam 14,500 V 5,000 V 3,500 V
Removing bubble pack from PCBs26,000 V20,000 V7,000 V
Packing PCBs in foam-lined box 21,000 V 11,000 V 5,000 V
Note: 700 volts can degrade a product. 
						

							18 REMOVAL SEQUENCEPRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1400 SERIES
Presario 1400 Series
Model XL240, XL241, XL242, XL244, XL245, XL246, XL247, XL250, XL340, 
XL341, XL342, XL343, XL344, XL345, XL346, XL350, XL352, XL355, and XL356
Service Considerations
During the disassembly and assembly of the Notebook, please keep in mind the considerations listed 
below.
Tool and Software Requirements
To service the Notebook, the following items are required:
Torx T-8 or T-9 screwdriver
5mm nut drivers (for screwlocks and standoffs)
Small standard screwdriver
Small Phillips screwdriver
Diagnostics software
Screws
The screws are not interchangeable. If an incorrect screw is applied during the reassembly process, 
it can damage the unit. Compaq strongly recommends that you keep all screws with their respective 
parts as they are removed during disassembly. Then replace the screws in their proper locations.
As each subassembly is removed from the Notebook, place it away from the work area to prevent 
damage. 
						

							PRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1400 SERIESREMOVAL SEQUENCE 19
Presario 1400 Series
Model XL240, XL241, XL242, XL244, XL245, XL246, XL247, XL250, XL340, 
XL341, XL342, XL343, XL344, XL345, XL346, XL350, XL352, XL355, and XL356
Cables and Connectors
Most of the cables inside the Notebook are ribbon cables. Handle cables with extreme care to avoid 
damage. During insertion or removal from the connector, apply only the amount of pressure 
required to seat or unseat the cable, handling it by the connector whenever possible. In all cases, 
avoid bending, twisting, or tearing the cables. Route cables in such a way that they cannot be 
caught or snagged by parts being removed or replaced.
Cables
To avoid damage to the cable or the Notebook, the following precautions should be taken when 
handling cables:
Always handle cables by their connectors.
Avoid bending, twisting, or pulling on the cables.
Apply minimum required force when seating or unseating the cables from their connectors.
Place the cables in such a manner that they cannot be caught or snagged by parts being 
removed or replaced.
Handle flex cables with extreme care; they can tear easily.
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CAUTION: When servicing Notebooks, place cables in their proper location during 
the reassembly process. Improper cable placement can cause severe damage to 
the Notebook.
Cable Illustrations
The following illustrations show the proper placement for each cable: 
Zif Cable
Speaker Assembly Cable
Keyboard Ribbon Cable
NIC Cable 
						

							20 REMOVAL SEQUENCEPRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1400 SERIES
Presario 1400 Series
Model XL240, XL241, XL242, XL244, XL245, XL246, XL247, XL250, XL340, 
XL341, XL342, XL343, XL344, XL345, XL346, XL350, XL352, XL355, and XL356
Connectors and Plastic Parts
Plastic parts can be damaged by the use of excessive force during disassembly and reassembly. 
Handle with care when disassembling and assembling plastic parts. As recommended in the 
maintenance instructions, apply pressure only at the designated points.
ZIF Connectors
The Notebook uses zero insertion force (ZIF) connectors on the system board.
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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 
a cable while it is connected.
To remove a cable from a ZIF connector, lift both corners of the ZIF connector and slide 
simultaneously with constant light pressure.
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CAUTION: When servicing a Notebook, place cables in their proper location during 
the reassembly process. Improper cable placement can cause severe damage to 
the Notebook.
To view other cables, click Cable Illustrations. 
						

							PRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1400 SERIESREMOVAL SEQUENCE 21
Presario 1400 Series
Model XL240, XL241, XL242, XL244, XL245, XL246, XL247, XL250, XL340, 
XL341, XL342, XL343, XL344, XL345, XL346, XL350, XL352, XL355, and XL356
Speaker Assembly Cable
The ribbon cable position for the speaker assembly is shown below.
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CAUTION: When servicing a Notebook, place cables in their proper location during 
the reassembly process. Improper cable placement can cause severe damage to 
the Notebook.
To view other cables, click Cable Illustrations. 
						

							22 REMOVAL SEQUENCEPRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1400 SERIES
Presario 1400 Series
Model XL240, XL241, XL242, XL244, XL245, XL246, XL247, XL250, XL340, 
XL341, XL342, XL343, XL344, XL345, XL346, XL350, XL352, XL355, and XL356
Keyboard Ribbon Cable
The ribbon cable position for the keyboard is shown below.
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CAUTION: When servicing a Notebook, place cables in their proper location during 
the reassembly process. Improper cable placement can cause severe damage to 
the Notebook.
To view other cables, click Cable Illustrations. 
						

							PRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1400 SERIESREMOVAL SEQUENCE 23
Presario 1400 Series
Model XL240, XL241, XL242, XL244, XL245, XL246, XL247, XL250, XL340, 
XL341, XL342, XL343, XL344, XL345, XL346, XL350, XL352, XL355, and XL356
Internet Button Board Cover
1. Prepare the Notebook for disassembly (pg 4).
2. Remove the cosmetic side covers (pg 7
).
3. Turn the Notebook upside down.
4. Remove the two screws from underneath the unit toward the rear.
Continued 
						

							24 REMOVAL SEQUENCEPRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1400 SERIES
Presario 1400 Series
Model XL240, XL241, XL242, XL244, XL245, XL246, XL247, XL250, XL340, 
XL341, XL342, XL343, XL344, XL345, XL346, XL350, XL352, XL355, and XL356
5. Carefully pry with the flat end of a screwdriver to lift the Internet Button Board Cover.
6. Disconnect the backlight and flex cables.
7. Remove the Internet Button Board Cover from the Notebook.
Note: The hinge covers and backlight switch are located on the Internet Button Board 
Cover.
To replace the Internet Button Board Cover, reverse the procedure. 
						

							PRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1400 SERIESREMOVAL SEQUENCE 25
Presario 1400 Series
Model XL240, XL241, XL242, XL244, XL245, XL246, XL247, XL250, XL340, 
XL341, XL342, XL343, XL344, XL345, XL346, XL350, XL352, XL355, and XL356
Keyboard
To remove the keyboard, complete the following steps:
1. Prepare the Notebook for disassembly (pg 4
).
2. Remove the cosmetic side covers (pg 7
).
3. Remove the Internet Button Board Cover (pg 23
).
4. Lift the back of the keyboard and disconnect the flex cable from the ZIF Connector on the 
system board.
5. Remove the keyboard from the unit.
Note: When replacing the keyboard, the Keyboard Ribbon Cable should fold behind the 
ZIF Connectors rather than underneath the keyboard. 
						

							26 REMOVAL SEQUENCEPRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1400 SERIES
Presario 1400 Series
Model XL240, XL241, XL242, XL244, XL245, XL246, XL247, XL250, XL340, 
XL341, XL342, XL343, XL344, XL345, XL346, XL350, XL352, XL355, and XL356
PCA Button Board
To remove the PCA Button Board, complete the following steps:
1. Prepare the Notebook for disassembly (pg 4
).
2. Remove the cosmetic side covers (pg 7
).
3. Remove the Internet Button Board Cover (pg 23
).
4. Remove the keyboard (pg 25
).
5. Disconnect the backlight cable from the system board.
Note: Do not use excessive force when removing cables or boards.
Continued