IBM 2658 Hardware Maintenance Manual - Page 43

Checking the AC Adapter You care here because the computer fails only when the AC Adapter is used: v If the power-on indicator does not turn on, check the power cord of the AC Adapter for correct continuity and installation. v If the operational charge does not work, go to "Checking operational charging". Unplug the AC Adapter cable from the computer and measure the output voltage at the plug of the AC Adapter cable. See the following figure: Pin Voltage (V dc) 1 15.5 V. - 17.0 V. 2 Ground If the voltage is not correct, replace the AC Adapter. If the voltage is within the range, do the following: v Replace the system board. v If the problems still persist, go to "Undetermined Problems" on page 54. Note: An audible noise from the AC Adapter does not always indicate a defect. Checking operational charging To check operational charging, use a discharged battery pack (Battery ASM) or a Battery ASM that has less than 50% of the total power remaining when installed in the computer. Perform operational charging. If the battery status indicator or icon does not turn on, remove the Battery ASM and let it return to room temperature. Reinstall the Battery ASM. If the charge indicator or icon still does not turn on, replace the Battery ASM. If the charge indicator still does not turn on, replace the system board. Then reinstall the Battery ASM. If the reinstalled Battery ASM is not charged, go to the next section. MT 2658/2659/2677 37