IBM 1400 (2611) manual Keyboard and External Input Device Check, Memory, Cannot work without Dimm

DIMM		DIMM		Total Memory
32MB		128MB		160MB
128MB		64MB		192MB
64MB		128MB		192MB
128MB		128MB		256MB
CAUTION:
This system	cannot work without DIMM		memory.

Memory errors might stop system operation, show erro messages on the screen, or hang the system.

Use the following procedure to isolate memory probl

Note: Make sure that the DIMM is properly installed the connector. A loose connection can cause an error.

1. Power off the computer and replace the DIMM.

2.Boot from the diagnostics diskette and start t program (please refer to “Running the PQA Diagnos tics Program” on page 49).

3.Run theMemory item to run the memory test.

If no error appears, install appears, replace the system

a new DIMM; if an er board.

Keyboard and External Input Device

Check

Note: If an external keyboard is attached, remove internal keyboard has to be tested.

If the internal keyboard does not work or an unexp character appears, make sure that the flexible ca extending from the keyboard is correctly seated i nector on the TrackPoint board.

If the tests do not detect a keyboard problem, board test by doing the following:

1.Boot from the diagnostics diskette and start t program (please refer to “Running the PQA Diagnos tics Program” on page 49).

2.Go toDiag and selectManual Test , then choose

Keyboard from the Test Item F2and topress execute.

3. Check that when each key is pressed, the key tion on the keyboard layout on the screen chang a black square.

Note:	Press Y+Enter to close	the test.
If	the test detects a	keyboard problem, do the

one at a time to correct the problem. Do not repl defective FRU.

Ÿ Ensure the keyboard switch is correctly set.

28 ThinkPad i Series 1400 HMM