SENSATION!  (250-1650)       Opening the Computer       Faxback Doc. # 1350

Turn off the computer, and turn off and disconnect the monitor and any other
equipment. Disconnect all the cables from the back panel.

CAUTION: Your body holds static electricity that can damage computers. Touch
a grounded metal object to discharge accumulated static electricity.

1. Use a Phillips screwdriver to remove the two screws that secure the cover
   to the computer. Carefully slide the cover from the computer.
2. Press down on the expansion adapter cover, applying a minimal amount of
   pressure. Slide it away from the tab, toward the front of the computer.
3. Rotate the expansion adapter cover away from the computer, and remove it
   from the side slots at the bottom of the computer.
   If you are installing an expansion adapter or a replacement battery, you
   can proceed to the appropriate installation section in this chapter after
   removing the expansion adapter cover.
4. Lift the drive bay cover, and remove it from the side slots at the top of
   the computer.

Removing the Drive Tray:

The drive tray contains the diskette drive, the hard drive, and the CD-ROM
drive. Remove the drive tray only if you need to perform one of the
following tasks:

* install SIMMs in the SIMM sockets
* install an optional i487 SX or OverDrive upgrade processor
* check the connections of cables to the main logic board

CAUTION: The drives in the drive tray are connected to the main logic board
by cables. Handle the drive tray carefully to avoid disconnecting the cables.

To remove the tray:

1. Place both hands under the drive tray. Firmly grasp the drive tray, and
   lift it.
2. Carefully turn the drive tray upside down and place it on top of the
   power supply. The underside of the hard drive is exposed.

   CAUTION: Do not touch or otherwise make contact with the components on
   the underside of the hard drive.

   The SIMM sockets on the main logic board are now visible.
   You can disconnect the drive cable from the back of the hard drive for
   better access to the SIMM sockets, if you wish.

Removing the Power Supply:

Remove the power supply if you need to check the audio cable connection or
the Synthesizer Interrupt Jumper setting. These components are located under
the power supply.

1. Place both hands under the front of the power supply, and lift the power
   supply out of the computer as shown (straight up).
2. Check the jumper setting and/or the audio cable connection under the
   power supply.

Note: It is not necessary to disconnect the power supply output cables to
adjust the jumper and/or audio cable.

Closing the Computer:

After you install options, follow these steps to close the computer:

CAUTION: Confirm that all cable connections are secure and that the power
actuator is properly positioned before closing the computer. Your computer
will not operate properly if connectors are loose. To avoid damaging the
switch on the front of the power supply, check that the power actuator is
pressed forward before you place the power supply in the computer. The
computer will not power on if the power actuator is improperly positioned.

1. If you removed the power supply, carefully place it into the computer as
   shown.
2. Check that the power actuator is properly positioned in the mounting tabs
   on the right side of the computer.

Press and release the power button to confirm that it operates properly.

3. Check that all drive cables are properly connected to the main logic
   board and to the drives in the drive tray.
4. Locate the alignment flanges on the front of the drive tray. Position the
   drive tray so that the small flanges on bottom, near the sides of the
   drive tray fit behind the front edge of the computer. Press the drive
   tray backward and downward.

CAUTION: Pressing directly on the CD-ROM drive or the diskette drive can
damage the drives. Press on the drive tray edges to position the drive tray
in the computer.

5. Position the drive bay cover in the side slots at the top of the computer.
   Close the drive bay cover.
6. Place the expansion adapter cover in the side slots at the bottom of the
   computer. Close the expansion adapter cover, and insert the expansion
   adapter cover tabs into the slots in the drive bay cover.
7. Slide the cover backward to secure it under the tab.
8. Position the outer cover on the computer.

Check that the cover is properly positioned. The reset button and other
controls must fit properly.

9. Slide the cover onto the computer until it fits into place.
10. Install the two screws in the outer cover.
11. Connect the keyboard, monitor, power cord, mouse, and cables for any
    other external options.
12. Turn on the computer and the monitor to begin using your Sensation.

(smm 08/06/93)