HP 8 1401 Instruction Manual

							Tablet major components
Item ComponentSpare part number
(1) Back cover762004-001
(2) Front-facing webcamera (includes cable) 767236-001
(3) Rear-facing webcamera (includes cable) 773139-001
(4) Speaker Kit (includes left and right speakers and cables) 773138-001
(5) Microphone (includes cable) 773135-001
(6) Antenna Kit (includes wireless antenna cables and transceiver) 773133-001
(7) System board equipped with AllWinner A31S 1.00-GHz quad core processor,
graphics subsystem with UMA memory, 1.0-GB DDR3 system memory, and 16-GB
eMMC hard drive762005-001
(8) Battery, 3.7-V, 3800-mAh, LI (includes cable) 773134-001
Tablet major components
5 
						

							Item ComponentSpare part number
(9) Power/volume button board (includes cable) 753188-001
(10) 7.85-in, TouchScreen display panel assembly (includes display panel cable
and TouchScreen cable)773137-001
Miscellaneous parts
ComponentSpare part number
5.0-V, 2-A AC adapter:
For use only in Argentina757042-001
For use only in Australia757043-001
For use only in Brazil761437-001
For use only in European countries and regions 747779-001
For use only in India757282-001
For use only in North America 745229-001
For use only in the Peoples Republic of China 757280-001
For use only in the United Kingdom and Singapore 747780-001
HP 8 Tablet equipped with AllWinner A31S 1.00-GHz quad core processor, graphics
subsystem with UMA memory, 1.0-GB DDR3 system memory, and 16-GB eMMC hard drive760742-001
Screw Kit753190-001
USB extension cable770129-001
Sequential part number listing
Spare part number Description
745229-001 5.0-V, 2-A AC adapter for use only in North America
747779-001 5.0-V, 2-A AC adapter for use only in European countries and regions
747780-001 5.0-V, 2-A AC adapter for use only in the United Kingdom and Singapore
753188-001 Power/volume button board (includes cable)
753190-001 Screw Kit
757042-001 5.0-V, 2-A AC adapter for use only in Argentina
757043-001 5.0-V, 2-A AC adapter for use only in Australia
757280-001 5.0-V, 2-A AC adapter for use only in the Peoples Republic of China
757282-001 5.0-V, 2-A AC adapter for use only in India
6 Chapter 3   Illustrated parts catalog 
						

							Spare part number Description
760742-001 HP Tablet equipped with AllWinner A31S 1.00-GHz quad core processor, graphics subsystem with
UMA memory, 1.0-GB DDR3 system memory, and 16-GB eMMC hard drive
761437-001 5.0-V, 2-A AC adapter for use only in Brazil
762004-001 Back cover
762005-001 System board (equipped with AllWinner A31S 1.00-GHz quad core processor, graphics subsystem
with UMA memory, 1.0-GB DDR3 system memory, and 16-GB eMMC hard drive)
767236-001 Front-facing webcamera (includes cable)
770129-001 USB extension cable
773133-001 Antenna Kit (includes wireless antenna cables and transceiver)
773134-001 Battery (3.7-V, 3800-mAh, LI, includes cable)
773135-001 Microphone (includes cable)
773137-001 7.85-in, TouchScreen display panel assembly (includes display panel cable and TouchScreen cable)
773138-001 Speaker Kit (includes left and right speakers and cables)
773139-001 Rear-facing webcamera (includes cable)
Sequential part number listing
7 
						

							4 Removal and replacement
preliminary requirements
Tools required
You will need the following tools to complete the removal and replacement procedures:
●Magnetic screw driver
●Phillips P0 screw driver
●Plastic case utility tool
Service considerations
The following sections include some of the considerations that you must keep in mind during
disassembly and assembly procedures.
NOTE:As you remove each subassembly from the tablet, place the subassembly (and all
accompanying screws) away from the work area to prevent damage.
Plastic parts
CAUTION:Using excessive force during disassembly and reassembly can damage plastic parts.
Use care when handling the plastic parts. Apply pressure only at the points designated in the
maintenance instructions.
Cables and connectors
CAUTION:When servicing the tablet, be sure that cables are placed in their proper locations during
the reassembly process. Improper cable placement can damage the tablet.
Cables must be handled with extreme care to avoid damage. Apply only the tension required to unseat
or seat the cables during removal and insertion. Handle cables by the connector whenever possible. In
all cases, avoid bending, twisting, or tearing cables. Be sure that cables are routed in such a way that
they cannot be caught or snagged by parts being removed or replaced. Handle flex cables with
extreme care; these cables tear easily.
8 Chapter 4   Removal and replacement preliminary requirements 
						

							Grounding guidelines
Electrostatic discharge damage
Electronic components are sensitive to electrostatic discharge (ESD). Circuitry design and structure
determine the degree of sensitivity. Networks built into many integrated circuits provide some
protection, but in many cases, ESD contains enough power to alter device parameters or melt
silicon junctions.
A discharge of static electricity from a finger or other conductor can destroy static-sensitive devices or
microcircuitry. Even if the spark is neither felt nor heard, damage may have occurred.
An electronic device exposed to ESD may not be affected at all and can work perfectly throughout a
normal cycle. Or the device may function normally for a while, then degrade in the internal layers,
reducing its life expectancy.
CAUTION:To prevent damage to the tablet when you are removing or installing internal
components, observe these precautions:
Keep components in their electrostatic-safe containers until you are ready to install them.
Before touching an electronic component, discharge static electricity by using the guidelines described
in this section.
Avoid touching pins, leads, and circuitry. Handle electronic components as little as possible.
If you remove a component, place it in an electrostatic-safe container.
The following table shows how humidity affects the electrostatic voltage levels generated by
different activities.
CAUTION:A product can be degraded by as little as 700 V.
Typical electrostatic voltage levels
 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
Grounding guidelines
9 
						

							Packaging and transporting guidelines
Follow these grounding guidelines when packaging and transporting equipment:
●To avoid hand contact, transport products in static-safe tubes, bags, or boxes.
●Protect ESD-sensitive parts and assemblies with conductive or approved containers or packaging.
●Keep ESD-sensitive parts in their containers until the parts arrive at static-free workstations.
●Place items on a grounded surface before removing items from their containers.
●Always be properly grounded when touching a component or assembly.
●Store reusable ESD-sensitive parts from assemblies in protective packaging or
nonconductive foam.
●Use transporters and conveyors made of antistatic belts and roller bushings. Be sure that
mechanized equipment used for moving materials is wired to ground and that proper materials
are selected to avoid static charging. When grounding is not possible, use an ionizer to dissipate
electric charges.
Workstation guidelines
Follow these grounding workstation guidelines:
●Cover the workstation with approved static-shielding material.
●Use a wrist strap connected to a properly grounded work surface and use properly grounded tools
and equipment.
●Use conductive field service tools, such as cutters, screw drivers, and vacuums.
●When fixtures must directly contact dissipative surfaces, use fixtures made only of static-
safe materials.
●Keep the work area free of nonconductive materials, such as ordinary plastic assembly aids
and Styrofoam.
●Handle ESD-sensitive components, parts, and assemblies by the case or PCM laminate. Handle
these items only at static-free workstations.
●Avoid contact with pins, leads, or circuitry.
●Turn off power and input signals before inserting or removing connectors or test equipment.
10 Chapter 4   Removal and replacement preliminary requirements 
						

							Equipment guidelines
Grounding equipment must include either a wrist strap or a foot strap at a grounded workstation.
●When seated, wear a wrist strap connected to a grounded system. Wrist straps are flexible straps
with a minimum of one megohm ±10% resistance in the ground cords. To provide proper ground,
wear a strap snugly against the skin at all times. On grounded mats with banana-plug connectors,
use alligator clips to connect a wrist strap.
●When standing, use foot straps and a grounded floor mat. Foot straps (heel, toe, or boot straps)
can be used at standing workstations and are compatible with most types of shoes or boots. On
conductive floors or dissipative floor mats, use foot straps on both feet with a minimum of one
megohm resistance between the operator and ground. To be effective, the conductive must be
worn in contact with the skin.
The following grounding equipment is recommended to prevent electrostatic damage:
●Antistatic tape
●Antistatic smocks, aprons, and sleeve protectors
●Conductive bins and other assembly or soldering aids
●Nonconductive foam
●Conductive tabletop workstations with ground cords of one megohm resistance
●Static-dissipative tables or floor mats with hard ties to the ground
●Field service kits
●Static awareness labels
●Material-handling packages
●Nonconductive plastic bags, tubes, or boxes
●Metal tote boxes
●Electrostatic voltage levels and protective materials
The following table lists the shielding protection provided by antistatic bags and floor mats.
Material Use Voltage protection level
Antistatic plastics Bags 1,500 V
Carbon-loaded plastic Floor mats 7,500 V
Metallized laminate Floor mats 5,000 V
Grounding guidelines
11 
						

							5 Removal and replacement
procedures
Tablet component replacement procedures
CAUTION:Tablet components described in this chapter should only be accessed by an authorized
service provider. Accessing these parts can damage the tablet and void the warranty.
This chapter provides removal and replacement procedures for authorized service provider only parts.
There are as many as 7 screws that must be removed, replaced, and/or loosened when servicing the
tablet. Make special note of each screw size and location during removal and replacement.
Back cover
DescriptionSpare part number
Back cover762004-001
7.85-in, TouchScreen display panel assembly includes display panel cable and TouchScreen
cable)773137-001
Before disassembling the tablet, follow these steps:
1.Turn off the tablet. If you are unsure whether the tablet is off or in Hibernation, turn the tablet on,
and then shut it down through the operating system.
2.Disconnect the power from the tablet by unplugging the power cord from the tablet.
3.Disconnect all external devices from the tablet.
Remove the back cover:
12 Chapter 5   Removal and replacement procedures 
						

							CAUTION:Before turning the display panel assembly upside down, make sure the work surface is
clear of tools, screws, and any other foreign objects. Failure to follow this caution can result in damage
to the display panel assembly.
1.Place the tablet on a flat surface, display panel side down, with the SD Card slot and volume
control buttons toward you.
CAUTION:When inserting the plastic tool into the tablet as described in Step 2, make sure not
to insert the tool into the volume control buttons area. Failure to follow this caution can result in
damage to the tablet.
2.Remove the four Torx5 TM1.3×4.0 screws that secure the back cover to the
display panel assembly.
CAUTION:When inserting the plastic tool into the tablet as described in Step 3, make sure not
to insert the tool into the power button area. Failure to follow this caution can result in damage to
the tablet.
3.Insert a thin, plastic tool (1) between the back cover and the display panel assembly. The first
insertion point should be near the power button (2) in the rear right corner of the tablet.
4.Lift the left edge of the back cover (3) until it separates from the display panel assembly.
5.Lift the top edge of the back cover (4) until it separates from the display panel assembly.
6.Lift the bottom edge of the back cover (5) until it separates from the display panel assembly.
Back cover
13 
						

							7.Remove the back cover (6).
Reverse this procedure to install the back cover.
Battery
DescriptionSpare part number
Battery 3.7-V, 3800-mAh, LI (includes cable) 773134-001
Before removing the battery, follow these steps:
1.Turn off the tablet. If you are unsure whether the tablet is off or in Hibernation, turn the tablet on,
and then shut it down through the operating system.
2.Disconnect the power from the tablet by unplugging the power cord from the tablet.
3.Disconnect all external devices from the tablet.
4.Remove the back cover (see 
Back cover on page 12).
WARNING!To reduce potential safety issues, use only the battery provided with the tablet, a
replacement battery provided by HP, or a compatible battery purchased from HP.
CAUTION:Removing a battery that is the sole power source for the tablet can cause loss of
information. To prevent loss of information, save your work or shut down the tablet through Windows
before removing the battery.
Remove the battery:
1.Unsolder the battery cables (1) from the system board.
14 Chapter 5   Removal and replacement procedures