IBM 689912U Hardware Maintenance Manual - Page 37

Keyboard Note If a mouse or other pointing device is attached, remove it to see if the error symptom goes away. If the symptom goes away, the mouse or pointing device is defective. 001 - Power-off the computer. - Disconnect the keyboard cable from the system unit. - Power-on the computer and check the keyboard cable connector on the system unit for the voltages shown. All voltages are ± 5%. Pin Voltage (Vdc) 1 +5.0 2 Not Used 3 Ground 6 5 4 +5.0 4 3 5 +5.0 6 Not Used 2 1 ARE THE VOLTAGES CORRECT? Yes No 002 Replace the system board. 003 On keyboards with a detachable cable, replace the cable. If the problem remains or if the cable is permanently attached to the keyboard, replace the keyboard. If the problem remains, replace the system board. Printer 1. Make sure the printer is properly connected and powered on. 2. Run the printer self-test. If the printer self-test does not run correctly, the problem is in the printer. Refer to the printer service manual. If the printer self-test runs correctly, install a wrap plug in the parallel port and run the diagnostic tests to determine which FRU failed. If the diagnostic tests (with the wrap plug installed) do not detect a failure, replace the printer cable. If that does not correct the problem, replace the system board or adapter connected to the printer cable. Service Information 27