Removing/Replacing The System Top Cover Case Assembly And The Trackball Assembly; Removing/Replacing The Hard Disk Drive - NEC Versa 550 Series Service Manual

4-16 Field Service Guidelines
Removing/Replacing the System Top Cover Case Assembly and the
Trackball Assembly
Most of the troubleshooting and field service done are on the system unit assembly where
the Motherboard and other modules are assembled. One important module assembled to the
top cover case assembly is the Trackball. The following procedure for removing and re-
placing the system top cover assembly is as follows:
Turn off the computer. Follow all disassembly procedures mentioned from the
1.
start of this section.
2. Turn the System Unit upside down with the bottom facing up. There are 9 screws
securing the base unit assembly from the top unit assembly. Remove them. It is
not necessary to remove the memory compartment cover.
3. Flip the whole unit back to normal position again. To separate the top cover from
the base unit, start at the rear side by pulling up the top cover and at the same
time pushing the base cover in. When the rear side is release from its fastener,
slowly pull the top case out while pushing the front base cover against you. The
front part is a little stiff. Note that there is still the Trackball cable attached from
the top case assembly to the Motherboard. Pull the cable out and remove the
whole top case assembly.
4. The Trackball module is assembled on the system top cover case. Turn the top
cover case at the back and you will find the trackball printed circuit board. Re-
move the two screws secured to the module and release the trackball assembly.
5. To replace the whole top case assembly, reverse the disassembly procedures
above. Make sure to test the trackball buttons first before entirely securing the
screws on it. Also on placing the top cover case together with system base unit
again, attached the front part of the top case first to the base unit before the rear
part.

Removing/Replacing the Hard Disk Drive

After removing the System Top Cover Assembly, you will now find the system Mother-
board and other modules. The procedure for removing and replacing the hard disk drive is
as follows:
Turn off the computer. Follow all disassembly procedures mentioned from the
1.
start of this section to remove the battery pack, the LCD panel, and the system
top cover case.
The hard drive module is assembled on the lower right side of the system base
2.
unit. Remove the screws attached to it and lift up the hard drive module.
3. Carefully pull out the hard drive cable attached to the motherboard.