5 Before You Start



This chapter contains information that is essential in preparing your system for service. If you are a qualified service-trained maintenance provider or are in contact with one, be sure to read through this chapter and the safety precautions in the "Safety Agency Compliance" section before starting any of the procedures in this part of the manual.

The information in this chapter is organized in the following manner: 

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What Are Field Replaceable Units?  page 5-2
                                   
Tools You Will Need                page 5-3
                                   
Shutting Down the System           page 5-4
                                   
Powering Off the System            page 5-5
                                   
Removing the Cover                 page 5-6
                                   
Replacing the Cover                page 5-7

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What Are Field Replaceable Units?

Desktop SunCD Plus Packs (DSPPs) are external SCSI drive units that can be connected directly to a system unit, or daisy chained and placed in a stack. Various parts of the DSPP can be replaced by field replaceable units (FRUs), as illustrated in the following list and figure.

    1. I/O Assembly
    2. Power Supply
    3. Top Cover
    4. SunCD Plus drive

    Figure 5-1 Field Replaceable Units

An overview of the tasks required for FRU replacement is shown below:

    Figure 5-2 Overview of FRU Replacement Procedure

Tools You Will Need

To remove and replace FRUs, you need the following tools and materials:

Shutting Down the System

Before you can service the DSPP, the system environment must be shut down according to the procedure detailed in your system's handbook. There are several steps to shutting down the system. If any one of these steps is omitted, the system may fail to boot, or may fail to correctly configure the DSPP. Some of these steps include:

    1. Go to your handbook for the operating system.
    2. Refer to the section about shutting down the system, then return to this manual after you complete this procedure.

Caution -

The system will not recognize the DSPP again unless you follow the shutdown procedures in the handbook for SMCC peripherals. Specifically, Solaris 2.x uses the new touch /reconfigure command to ensure autoconfiguration upon powering on. Be sure to refer to your peripheral handbook for correct shutdown procedures.

Powering Off the System

Turn the on/off switch to the off (O) position for each device in the following order:

      a. Peripherals

      DSPPs, External Storage Modules, Desktop Storage Packs/Modules, and other external drive units

      b. System unit
      c. Monitor

Warning - Be sure all power switches are turned to the off (O) position. The green light emitting diodes (LEDs) on all units should not be lit and the fans in the power supplies should not be running. The power cord should be plugged into a wall outlet and into the desktop system.

Caution - Always allow 10 seconds between turning off the power and turning it back on again. This pause prevents possible damage to power supply components in the system unit.

Removing the Cover

Once the system unit is powered down and the DSPP is disconnected, perform the following procedure to remove the DSPP's cover.

    1. Locate the top row of holes on the sides of the DSPP. Find the third hole from the rear of the unit on each side of the DSPP.
    2. Insert a small (2 to 3mm) screwdriver into the third hole from the rear on one side of the DSPP, pressing to release the catch. Repeat this procedure on the other side to release the second catch, allowing the end of the cover to come up.

    Figure 5-3 Removing the Desktop SunCD Plus Pack Cover

    3. Lift up the rear of the cover slightly and push it forward off of the front tabs.

    Set the cover aside.

Replacing the Cover

Once you have finished servicing the DSPP, perform the following procedure to replace the DSPP's cover.

    1. Holding the cover at an angle, engage the front tabs of the cover with the front of the unit, as shown below.

    Figure 5-4 Replacing the Cover of the Desktop CunCD Plus Pack

    2. Lower the rear of the cover.
    3. Press down firmly on the cover's sides until you hear a click of both cover catches engaging.