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Undetermined Problem (3550)



Undetermined Problem

Use the following procedure when the diagnostic tests do not identify the failing adapter or device.

Check the power supply (see 'Power Systems Checkout'). If the power supply is operating correctly, return here and continue with the following procedure.
  1.  Power-off the 3550 Expansion Unit.
  2.  Remove or disconnect one of the following adapters or devices.  (Do not isolate adapters or devices that are known to be good.)

    1.  Non-IBM devices
    2.  Modem, printer, mouse, external keyboard, external display,  numeric keypad, or other external devices
    3.  Any adapter
    4.  SCSI device

  3.  Power-on the 3550 Expansion Unit and reconfigure the system.
  4.  Run system checkout (see 'Step 016'  If diagnostic tests  cannot be loaded from the computer hard disk drive, load and run the  tests from the Reference Diskette. Test only those  adapters and devices  still attached to the 3550 Expansion Unit.
  5.  If the symptom remains, repeat steps 1 through 4,   until you find  the failing adapter or device.
  6.  If the problem remains,  replace the system board of the 3550 Expansion Unit.

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