compaq contura 400 family User Manual

							5. To replace the battery release button and spring, reverse the previous
steps.
Chapter 3.9 Real-Time Clock Battery (Models 400 and 410) 
To remove the real-time clock battery, follow these steps:
1. Disconnect all power from the computer and remove the AC Adapter and
battery pack (Section 3.2).
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							non conductive probe into the battery holder and pushing back on the
battery to release it (Figure 3-34).
NOTE: Refer to Chapter 2 Preparing the Computer for Service for battery
disposal procedures.
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							The computer becomes top heavy when the keyboard assembly is removed and
the display is opened. To prevent damage to the display and the computer,
ensure that the display assembly is opened to a 90-degree angle.
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							Chapter 3.11 Processor Upgrade Option (Model 400 Only) 
This section provides installation and replacement procedures for the
processor upgrade. The Compaq Contura 400 is the only model with the
DX2/40 MHz Processor that can be upgraded to a DX2/50 MHz processor. Once
the processor is installed, the upgraded processor overrides control of
the processor on the system board. You do not have to remove the system
board processor.
NOTE: Use only the DX2/50 MHz processor in the upgrade option slot.
To install the processor upgrade option, do the following:
1. Disconnect all power from the computer and remove the AC Adapter and
battery pack (Section 3.2).
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							4. To remove the processor upgrade, reverse the previous steps.
Chapter 3.12 Integrated Mechanical Trackball Assembly 
(Models 400 and 410) 
IMPORTANT: The mechanical trackball assembly is not interchangeable with
the optical trackball assembly in Models 420 and 430.
To remove the integrated mechanical trackball assembly, follow these steps:
1. Disconnect all power from the computer and remove the AC Adapter and
battery pack (Section 3.2).
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							2. Remove the keyboard assembly (Section 3.7).
3. Using a Torx T-8 or flat-bladed screwdriver, remove the screw from the
front right-hand corner of the integrated mechanical trackball assembly
(Figure 3-37).
4. Disconnect the integrated mechanical trackball assembly from the system
board by pulling forward on the integrated mechanical trackball
assembly until it stops.
5. Tilt up the front of the integrated mechanical trackball assembly and
lift it up to clear the connectors and the system board (Figure 3-38). 
						

							6. To replace the integrated mechanical trackball assembly, reverse the
previous steps.
Trackball Cleaning Procedures
1. Turn off the computer by pressing the left Ctrl+Alt keys and the power
button. Disconnect the AC power and remove the battery pack.
2. Loosen the trackball retaining ring by placing the trackball tool over
the retaining ring and turning the tool counterclockwise one quarter
turn.
3. Carefully remove the retaining ring. This is a delicate part and
repetitious handling of this piece may cause it to tear.
4. Remove the ball from its cage by gently lifting the computer and
turning it over so that the ball falls into your hand.
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							5. To replace the integrated mechanical trackball assembly, reverse the
previous steps.
Trackball Cleaning Procedures
1. Turn off the computer, disconnect AC power, and remove the battery pack.
2. Remove the Integrated trackball.
3. Remove any large particles of debris that have fallen into the
trackball housing.
4. Dip a cotton swab in isopropyl alcohol and squeeze off excess liquid.
5. Carefully wipe inside the cage to remove residue from surfaces. Clean
the ball bearings by rubbing with the swab. Do not attempt to remove
the bearings. Do not use alcohol on the sensor window. Instead, gently
wipe the sensor window with a soft, dry, lint-free cloth until all
debris is removed. Allow enough time for the parts to air dry before
reassembling.
6. Replace the ball and gently secure the retaining ring by rotating it
clockwise.