Power Systems Checkout (8554)

Power Systems Checkout

NOTE: One or all of the batteries can discharge if there is a short circuit in the computer.
  1.  Replace the failing FRU if the power supply problem is caused by  a short circuit.
  2.  Determine if one (or all) of the batteries have become discharged.  Replace a discharged battery with a known-good spare.
  3.  Observe the Battery ID indicators or swap the two battery packs  to determine which one has become discharged.

The test procedures for each power supply are found on the following pages.

Testing the AC Adapter
Testing the Battery Pack
Testing the Backup Battery

None of the above ? Follow the steps below.

  Yes   No-+002| Go to Step 004
 +-+-+     +---+
 Go to 'Testing the AC Adapter', If that does not
  correct the problem, replace the voltage converter.
  Yes   No-+005| Go to Step 007
 +-+-+     +---+
 - Make sure the battery packs are fully charged.
 - Go to 'Testing the Battery Pack' and check the battery packs.
   If that does not correct the problem,
   replace the voltage converter.
  Yes   No-+008| Go to Step 016
 +-+-+     +---+
 - Remove the following if installed:
  ° Battery packs
  ° Backup battery
  ° IC DRAM card
  ° Internal Data/Fax modem
  ° Serial adapter
  ° Numeric keypad
  ° Math coprocessor
  ° Mouse
  ° External display
 - Go to Step 010
 - Plug in the AC adapter and power-on the computer.
  Yes    No-+011|
   |        +---+
   |            - Power-off the computer and remove the following.
   |              ° Hard disk drive
   |              ° Diskette drive
   |              ° LCD cables
   |              ° Keyboard flexible cables
   |            - Power-on the computer again.
 +-+-+          - Go to Step 013
   Suspect one of the options or devices.
 - Reinstall each of the options or devices to the computer one at a
   time, and power-on the computer to see if the original problem occurs.
 - Replace the last installed option or device when the
   problem occurs.
  Yes    No-+014|
   |        +---+
   |            - Replace the following FRUs one at a time
   |              until the problem is corrected
   |              ° Indicator card
   |              ° System board
 +-+-+            ° Voltage converter
   Suspect one of the devices.
 - Reinstall each of the devices to the computer one at a time, and
   power-on the computer to see if the original problem occurs.
 - Replace the last installed device when the problem occurs.
 - Observe the system-status indicators for about
   1 second after power on.
   System-Status Indicator   Condition A   Condition B
   Power-On                  Off           On
   Suspend Mode              Off           On
   Scroll Lock               On            Off
   Caps Lock                 On            Off
   Numeric Lock              On            Off
   Diskette Drive            On            Off
   Hard Disk Drive           On            Off
   Battery ID 2              Off           On
   Battery Status 2          Off           On
   Battery ID 1              Off           On
   Battery Status 1          Off           On
   Carrier Detect            -             -

If the status lights match either condition A or B, replace the voltage converter. If the status lights are different from condition A or B, or replacing the voltage converter does not correct the problem, go to 'Undetermined Problem'

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