2500 SX/20  (250-4077)       Adding Floppy Drives       Faxback Doc. # 1109

Note: When installing 5 1/4 360K floppy drives, you may need a power
extender cable (278-767) for the B version of this machine.

Note: This CPU provides power to the floppy with a 4 pin mini power
connector. Previous units provided power through the floppy drive cable.
The 1.44Meg drive (25-4053) is not a direct replacement for the original
floppy. The correct drive replacement is available from Business Products
Parts. The 25-4053 can still be added to this unit if the 25-1076 adapter
is used and the drive is installed in a 5 1/4" bay.

* The floppy drive connector in your computer supports up to two diskette
drives.

CAUTION: The computer is designed to support Tandy diskette drives only.
Installing diskette drives from other manufacturers can damage the main
logic board.

To install a 3 1/2" hard drive in the 5 1/4" bay, you must install screws
in the bottom of the drive. Some 3 1/2" drives do not have mounting
holes on the bottom. These drives require a 3 1/2" to 5 1/4" Internal Disk
Adapter (25-1076) and an L-bracket.

* Install disk or tape cartridge systems in the 3 1/2" or 5 1/4" drive bay.

Plastic panels cover the openings of the 3 1/2" and 5 1/4" drive bays.
Before installing a diskette drive, or other drive that accepts removable
media, remove the appropriate panel.

* To remove the 3 1/2" panel, press down on the center tab from inside the
  cover. This panel is replaceable.

* To remove the 5 1/4" panel, press down on the panel from outside the
  cover. This panel is not replaceable.

Installing a 3 1/2" Diskette Drive:

Use the following procedure to install a 3 1/2" diskette drive. Refer to
the diskette drive installation guide for instructions on adjusting drive
components, connecting the drive cable, and selecting mounting holes on the
drive.

1. Open the computer to gain access to the 3 1/2" drive bay.
2. Select the appropriate mounting holes on the diskette drive.
3. Slide the drive into the 3 1/2" drive bay. With the drive resting on the
   center rail, align the mounting holes on the side of the carriage.
4. Mount the diskette drive in the bay by installing the four screws, two
   from the side and two from the bottom. Remove the plastic card from the
   5 1/4" bay. You will need to insert the screwdriver through the hole in
   the 5 1/4" bay to install one of the bottom screws.

Remove the panel from the computer cover. The diskette drive will extend
approximately 1/2" from the bay after installation.

5. Loosen the diskette drive cable connector from the cable attached to the
   factory-installed diskette drive. Pin 1 of the connector is labeled.
   Align Pin 1 of the cable connector with Pin 1 of the drive connector on
   the back of the diskette drive. Then, attach the cable connector to the
   drive connector.
6. Run the SetupSX utility to complete the installation.

Installing a 5 1/4" Drive:

Use the following procedure to install a 5 1/4" drive. Refer to the drive
installation guide for instructions on adjusting drive components,
connecting the cable, and selecting mounting holes on the drive.

1. Open the computer to gain access to the 5 1/4" drive bay.
2. If you are installing a diskette drive, a tape drive, or a CD-ROM drive,
   remove the plastic card from the bottom of the 5 1/4" bay and remove the
   panel from the computer cover.
3. Select the appropriate mounting holes for the drive. Refer to your drive
   installation guide.
4. Slide the drive into the bay. Align the appropriate mounting holes in
   the drive with the three mounting holes on the bottom of the carriage.
5. Mount the drive in the bottom of the carriage, using the screws included
   in your drive kit.
6. Connect the drive cable to the appropriate connector on the main logic
   board. Connect one of the power cables from the computer power supply
   to the power connector on the drive.

Installing a 3-1/2" Drive in the 5 1/4" Bay:

Refer to the drive installation guide for instructions on adjusting drive
components, connecting the cable, and selecting mounting holes on the
drive.

Note: Drives without mounting holes on bottom require an L-bracket
(MB-0136), available at Radio Shack stores, for this installation.

1. Open the computer to gain access to the 5 1/4" bay.
2. Install the drive in a 3 1/2" to 5 1/4" internal disk drive adapter
   (25-1076). Refer to the Internal Disk Drive Adapter installation guide
   for more information. Attach the drive cable to the device as directed.
3. Align the holes on the wider side of the L-bracket with the bottom set
   of holes on the drive adapter.
4. Insert the drive, adapter, and L-bracket into the 5 1/4" bay. Use the
   three screws from the installation kit to mount the device.
5. Attach the remaining cable connector to the appropriate connector on the
   main logic board.