Installing Flash EPROMs in the IGS/TR

Consult the appropriate system software publication for TFTP procedures.

General Safety

To ensure general safety, follow these guidelines:

• Keep the area of the chassis clear and dust-free during and after installation.
  

• Put removed chassis covers in a safe place and keep tools away from walk areas where you or others could trip over them.
  

• Do not wear loose clothing or other items that could get caught in the chassis; fasten your tie or scarf and sleeves.
  

• Wear safety glasses when working under conditions that might be hazardous to your eyes.
  

• Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
  

Safety with Electricity

Warning: Hazardous voltages may exist in or near the power supply, so use extreme caution when working with the power supply. Remove rings, watches, and any other jewelry before working on equipment that is connected to power lines. Metal objects will heat up when connected to power and ground and can weld to a terminal or cause serious burns.

Follow these guidelines when working on equipment powered by electricity:

• Locate the emergency power-off switch for the room in which you are working, so if an electrical accident occurs, you can act quickly.
  

• Disconnect all power before doing the following:
  

  • Installing or removing a chassis
    

  • Working near power supplies
    

  • Performing a software upgrade
    

• Before working on the system, turn off the power and unplug the power cord.
  

• Never assume that power has been disconnected from a circuit; always check.
  

• Do not work alone when potentially hazardous conditions exist.
  

• Carefully examine your work area for possible hazards, such as moist floors, ungrounded power extension cables, power surges, and missing safety grounds.
  

• If an electrical accident occurs, do the following:
  

  • Use caution; do not become a victim yourself.
    

  • Turn off power to the system.
    

  • If possible, send another person to get medical aid. Otherwise, assess the victim's condition and then call for help.
    

  • Determine if the person needs rescue breathing and/or external cardiac compressions; then take appropriate action.
    

Preventing Electrostatic Discharge Damage

When electronic printed circuit cards are improperly handled, electrostatic discharge (ESD) can damage equipment and impair electrical circuitry, and can result in complete or intermittent failures.

Always follow ESD prevention procedures when removing and replacing cards. Wear an ESD wrist strap, ensuring that it makes good skin contact. Connect the clip to an unpainted chassis frame surface to safely channel unwanted ESD voltages to ground. To properly guard against ESD damage and shocks, the wrist strap and cord must operate effectively.

Tools and Equipment

You need the following tools and equipment to install Flash EPROMs in the IGS/TR:

• ESD cord and wrist strap
  

• No. 1 Phillips screwdriver
  

• EPROM removal tool
  

• Eight Flash EPROMs
  

• Two Boot PROMs, labeled FW1 and FW2
  

Opening the Chassis

This section outlines the steps required to open the IGS/TR chassis. The following discussion assumes that you are looking at the IGS/TR from the front. Use Figure 1 as a guide while performing the cover and tray removal procedures.

Figure 1 : Internal View of the IGS/TR

Caution: Before opening the chassis, be sure you have discharged all static electricity from your body, as discussed in the section, "Preventing Electrostatic Discharge Damage." Ensure that the power cord has been disconnected.

Removing the Chassis Cover

To remove the IGS/TR cover, follow these steps.

Step 1: Turn off the unit and unplug it.

Step 2: Remove all cables from the back of the IGS/TR (including the power cable) to ensure that the unit is not powered on and to ensure that the cover will not get stuck on the cables. Avoid damaging any cables in the process.

Step 3: Turn the unit up so that the back of the chassis is resting on a surface, and the underside of the chassis is facing you, taking care not to damage the LAN or WAN connectors.

Step 4: Remove the latch screw behind the latch on the right underside of the chassis. The latch will not open until this screw is removed.

Step 5: Put the unit back down with the LEDs facing you. Place your fingers inside the two front latches on the underside of the chassis and push the latches away from you until they snap open.

Step 6: Lift the chassis cover from the front edge where the LEDs are located. The chassis cover will tilt up from the front toward the back. If you feel excessive resistance when opening the unit, one of the latches might still be closed. If this is so, try pushing back on the latches again.

Figure 2 : IGS/TR Tray Assembly

Step 7: Remove the ground wire (green with yellow stripes) connecting the hinge post on the cover with the main ground stud, as shown in Figure 2. The ground wire is attached to the main ground stud with a FASTON lug, so the wire can be slipped off easily.

Step 8: Remove the chassis cover the rest of the way by pulling it up and forward so that the hinge posts come free from the notches in the bottom tray.

Step 9: Set the cover aside.

Removing the Power Supply Tray

To remove the IGS/TR power supply tray assembly, follow these steps.

Step 1: Locate the DC power harness on the far left edge of the power supply tray assembly, as shown in Figure 2. Using the pull tab provided, detach the DC power harness from the system card under the power supply tray assembly.

Caution: If you lift the power supply tray assembly without removing this harness, you might damage the cable that provides all the power to the system card.

Step 2: Remove the power supply tray screw which is located near the right front top corner of the power supply tray assembly.