Attention: Pressing these switches when the Power light is on can cause a
system fault unless you first make the disk drives within the 7133 unit
unavailable to the operating system. To do this:
1. Use the system-management task menus of the operating system to make
the disk drives unavailable to the system.
2. If the 7133 unit is connected to more than one adapter, make the disk
drives unavailable to the system or systems for each of the paths to the
system.
Power light
The Power light, which is green, comes on permanently when the
power-supply units within the 7133 subsystem are supplying power to the rest
of the subsystem. When the subsystem is in standby mode, this light will be
flashing. In standby mode, the power-supply units do not supply power to the
drives. This mode is set by the power/standby switch on the Model D40 or
remotely on either model if the remote power option is installed.
Check light
The Check light, which is amber, comes on if a failure occurs within the 7133
unit. The unit might be able to continue operating satisfactorily even when the
failure of a single part has been detected. The light can be set flashing by an
SSA service aid to identify the failing 7133.
ID display
The ID display is a four-character display that can be set by the three ID push
buttons.
This display normally shows the ID of the 7133 unit. If a failure occurs within
the 7133 unit, an error ID for the failure is shown, alternating with the ID of the
7133 unit; “Identifying 7133 Units” on page 14 describes these how to set the
7133 IDs, the 7133 Models D40 and T40 Serial Disk Systems: Service Guide,
GY33–0192–02, describes the error IDs.
ID push buttons
You can use these push buttons to set the ID of the 7133 unit that is shown in
the ID display. Use a ball-point pen or similar instrument to press these push
buttons.
v
The left button steps through the four character positions, one position at a
time, to select the character position that you want to set.
v
The center button steps through the available characters, one character at a
time, to select a character.
v
The right button stores the selected ID.
If no push button is pressed within 10 seconds, the display resets to its last
valid setting.
6
7133 Models D40 and T40 Operator Guide
Summary of Contents for 7133 D40
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