IBM 8239 Token-Ring Stackable Hub, Setup And User Manual

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Any failure is considered irrecoverable. A failure prevents further system
initialization. Error codes are displayed. The 8239 stops with the green and yellow
box status LEDs on.
After a successful POST, the LCD indicates that the diagnostic tests are complete
by displaying the hub ID.
Table 5-10. POST Codes
Display Action
A, B, C, D, E, F,
G, H, no display 1. Press the Reset button. If the problem remains, continue with
step 2 on page 5-15.
2. Remove any optional features (see Chapter 3, “Installing
Features” on page 3-1 for instructions) and press the Reset
button again.
3. If the problem remains, replace the base unit.
4. Install features into new base unit, using the instructions in
Chapter 3, “Installing Features” on page 3-1.
I, J Replace the RI/RO Module, using the instructions in Chapter 3,
“Installing Features” on page 3-1. If the problem remains, replace
the base unit.
M Replace the 16-Port Expansion Feature, using the instructions in
Chapter 3, “Installing Features” on page 3-1. If the problem
remains, replace the base unit.
N, O 1. Press the Reset button. If the problem remains, continue with
step 2 on page 5-15.
2. Remove any optional features
3. Replace the base unit
4. Install features into new base unit
Operational Codes
LED Display Message
The 8239 Model 2 has a single-segment LED. During POST, the LED indicates the
progress of the diagnostic tests by displaying letters representing each test; the
same letter with a detailed test name and status is shown on the terminal interface
during the diagnostic tests. After POST is completed and the hub ID is assigned,
the hub ID is displayed.
LCD Messages
The LCD on the 8239 Model 1 is a 2 x 16-character display.
During bring-up, any messages that appear on the LCD when the LCD light is off
are not valid.
During POST, the LCD indicates the progress of the diagnostic tests by showing
letters representing each test; the same letter with a detailed test name and status
is shown on the terminal interface during diagnostic tests. After POST is finished,
the LCD shows the operational code version for about 5 seconds; this message
has the format:
OpCode Release.Version
During normal operation, the LCD shows:
Chapter 5. Problem Determination Procedures
5-15