170 MB SCSI Hard Drive (250-4162) Installation Faxback Doc. # 5118 CAUTION: Static electricity can destroy integrated circuits. Be sure to discharge any built-up static electricity by touching a grounded, metal object before handling the hard disk drive or touching any of the computer's logic boards. If you have any doubts about your ability to install this drive, have the service technicians at your Radio Shack Service Center install it for you. This will not only ensure expert installation but will also enable the technicians to quickly check that all equipment is functioning properly. Note: If you are installing the SCSI hard disk drive in a Tandy 3000HL, you must install the Universal Mounting Kit provided with your computer before you begin this procedure. Refer to the universal mounting kit manual for instructions. REMOVING THE COVER If you have not already done so, remove the system unit cover for access to the computer's internal components. Follow the steps below: 1. Be sure your computer and all peripherals are turned off, then disconnect the power cord from the back of the computer. 2. Remove the large cover mounting screws from the computer's back panel. Remove the cover by sliding the entire housing toward the front of the computer. The cover removal procedure is illustrated in the installation and operation manual supplied with your computer. Note: If your computer has a fan in the front of the unit, you might find it easier to remove and replace the cover if you first remove the fan filter. Unfasten the Velcro tab that secures the filter to the bottom of the unit housing, and pull the filter straight down to remove it. Be sure to replace the fan filter after you complete the installation. PREPARING THE HARD DISK DRIVE If just one drive is to be installed, it shall be the Primary Drive. If two drives are to be installed, one must be designated the Primary Drive, the other must be designated the Secondary Drive. Prepare the Hard Disk Drive(s) for installation as follows: Primary Drive Make sure that all drive select jumpers are removed so that Logical Address 0 is indicated. Make sure the termination resistor packs are installed. Secondary Drive Make sure that one drive select jumper is installed in location 1 and all other drive select jumpers are removed so that Logical Address 1 is indicated. Make sure the termination resistor packs are removed from the drive. For a Tandy 3000HL installation, you are now ready to install the hard disk drive. Skip the next two sections of this manual. If you are installing the hard disk drive in a Tandy 3000 or a Tandy 4000, refer to the next section, "Removing the Drive Tower". REMOVING THE DRIVE TOWER For easy drive installation in a Tandy 3000 or Tandy 4000, you can remove the chassis that houses the disk drives. Before removing the drive tower, be sure to note the location of and disconnect any cables attached to the internal drives. Then, remove the four screws that secure the tower to the bottom of the computer chassis and the three screws that secure the tower to the front of the chassis. Note: It is not necessary to remove the drive tower for a Tandy 3000HL installation. Carefully lift the drive tower up and out of the system unit. Check for a load resistor that might be attached to the inner wall of the driver tower, below the floppy disk drive. If the load resistor is present, proceed to the next section, "Removing the Load Resistor". If there is no load resistor, skip the next section and your are now ready to install the hard disk drive. REMOVING THE LOAD RESISTOR Pull apart the white cable connector to disconnect the load resistor from its cable, and remove the two screws that secure the load resistor to the side of the drive tower. Remove the load resistor and store it in a safe place. If you later remove the hard disk(s) from your computer to reconfigure it as a floppy-only system, you must reinstall the load resistor. INSTALLING THE HARD DISK DRIVE The procedure for installing the hard disk drive varies depending on whether the installation is a primary or secondary drive in a Tandy 3000/4000 or is into a Tandy 3000HL. Following are the instructions for each of these procedures. Use the appropriate procedure to install the hard disk drive in your computer. Tandy 3000/4000 (Primary Drive) If you are installing the hard disk drive as a primary drive in the Tandy 3000/4000, attach the four shock isolators included with this kit to the upper set of mounting holes along the sides of the hard disk drive. Next, slide the hard disk drive into the bottom slot of the computer's drive tower, making sure that the drives do not slide against each other. Use the four machine screws provided with the hard disk controller kit to secure the hard disk drive to the drive tower. Note: IF you are installing a full height disk drive, it will occupy both the bottom and second slot of the drive tower. If you are adding another disk drive, you should also install it at this time. Refer to the installation instructions that come with the drive to install a secondary hard disk or floppy disk drive. You are now ready to install the host adapter board and complete all connections. Proceed with the "Connecting the Cable to the Host Adapter Board" section of this manual. Tandy 3000/4000 (Secondary Drive) If you are installing the hard disk drive as a secondary drive in a Tandy 3000 or Tandy 4000, install the four grommets that come with this hard disk drive kit in the mounting holes in the second drive slot of the computer's drive tower. Next, slide the hard disk drive into the middle slot of the computer's drive tower, making sure that the drives do not slide against each other. Use the four shoulder screws provided with this kit to secure the hard disk drive to the drive tower. You are now ready to install the host adapter board and complete all connections. Proceed with the "Connecting the Cable to the Host Adapter Board" section of this manual. Tandy 3000HL For a Tandy 3000HL installation, follow the instructions in the universal mounting kit manual (provided with your computer) to install the hard disk. Attach the two mounting brackets and four of the shock isolators provided with the universal mounting kit to the bottom set of mounting holes along the sides of your hard disk drive. If you are installing a secondary hard disk drive, the mounting brackets are already installed in your computer. In this case, remove the bracket/disk drive assembly. Then, follow the instructions in the universal mounting kit manual to attach the drive to the brackets. Now, slide the bracket/disk drive assembly into the computer's drive tower. Use the four shoulder screws provided with this hard disk drive kit to secure the bracket and disk drive(s) to the drive tower. You are now ready to install the host adapter board and complete all connections. Proceed with the "Connecting the Cable to the Host Adapter Board" section of this manual. CONNECTING THE CABLE TO THE HOST ADAPTER BOARD Caution: A low humidity environment and walking on carpeted floors, among other things, can cause static electricity to build-up on you. Discharge any built-up static electricity by touching a grounded, metal object before you begin. The host adapter board is difficult to access after it is installed. Therefore, you should set the jumpers and connect the cables to the board before you install it. Refer to the "Tandy 16-bit SCSI Adapter Installation Manual" (provided with the host adapter) for the proper jumper settings. Note: For the purpose of this manual, the ends of the 50-pin SCSI bus data cable are defined as follow: The "drive end" is the end of the SCSI bus data cable with two connectors situated close to one another; the "host end" is the end with only one connector. Connect the "host end" of the SCSI bus data cable to the connector J2 on the host adapter board. Be sure that the arrow on the SCSI bus data cable meets with Pin 1 on the J2 connector. The stripe on the SCSI bus data cable should always go to pin 1 of the cable connector. INSTALLING THE HOST ADAPTER BOARD Now you are ready to install the host adapter board. Follow these steps to install this board. 1. Select an empty, full-size option slot in which to install the host adapter board. The best location for this board is usually in one of the two full-size option slots closest to the drive tower. This allows the SCSI bus data cable to easily reach the drive. 2. Before you actually install the host adapter, you must remove the slot cover. Remove the screw from the slot cover on the computer's back panel. Then tilt the slot cover away from the opening and lift it out of the computer. 3. If the slot you have chosen causes the SCSI bus data cable to reside between two PC boards, fold the cable. 4. Slip the front edge of the host adapter board into the plastic card guide at the front of the computer, and insert the board's metal mounting bracket into the option slot opening. As you slide the board down the card guide, avoid letting the SCSI bus data cable touch any adjacent PC boards. Push the board's edge connector firmly into the option slot socket. Be sure the board is fully seated. 5. Use the screw you removed previously to secure the host adapter board's mounting bracket to the back panel of the computer. COMPLETING THE INSTALLATION Connect all internal disk drive cables to complete the hard disk drive installation. These cables are keyed to connect in only one way, so do not force the cables as you connect them. Also, try to avoid twisting the cables as you connect them. The easiest way to ensure that the disk drive cables lay flat is to thread them under the power cables. 1. Disconnect the main power cable from the main logic board by pressing in on the tabs as you lift the connector. 2. Attach the end connector on the "drive end" of the SCSI bus data cable to the primary hard disk drive. Be sure that the arrows on the drive match with the cable connectors. 3. If you have two internal hard disk drives, attach the middle connector on the "drive end" of the SCSI data cable to the secondary hard disk drive. Again, be sure that the arrows on the drive match with the cable connectors. 4. Connect the 4-pin power cables to your internal disk drives. These power cables are identical and can be connected interchangeably to any internal disk drives. 5. Reconnect any cables that were disconnected to remove the drive tower. 6. If you previously removed the drive tower, replace it, using the screws you removed to secure it to the computer chassis. Be sure that no cables are under the drive tower when you replace it. 7. Reconnect the main power cable connector to the main logic board. 8. After all internal cables are properly connected, replace the cover. With the lip of the cover under the lower rail on the system unit's frame, slide the entire housing toward the back of the computer. Replace the cover mounting screws on the computer's back panel. Replace the fan filter if you previously removed it. 9. Reconnect all peripheral cables to the appropriate connectors on the back of the computer. Reconnect the power cord. (dkh-07/29/93)