Hardware Maintenance Manual
Page 20
... there is worn or defective. v Disconnect all power before returning the machine to work alone under hazardous conditions or near power supplies - If you start to lock the wall box in your pocket or behind your body. 14 ThinkPad T20, T21, T22, T23 (MT 2647/2648) Use only one hand when... working on the machine, unplug the power cord. Removing or installing main units v...
... there is worn or defective. v Disconnect all power before returning the machine to work alone under hazardous conditions or near power supplies - If you start to lock the wall box in your pocket or behind your body. 14 ThinkPad T20, T21, T22, T23 (MT 2647/2648) Use only one hand when... working on the machine, unplug the power cord. Removing or installing main units v...
Hardware Maintenance Manual
Page 21
...maintain your work with very high voltages; such touching can cause personal injury and machine damage. Power supply units - Use caution; Switch off . Safety inspection guide The purpose of non-IBM features or options not covered by this inspection guide is conductive; This guide addresses only those...frames. v Do not service the following parts with the reflective surface of these instructions are moist floors, nongrounded power extension cables, power surges, and missing safety grounds. Stand on when they are removed from injury. v Do not touch live electrical circuits ...
...maintain your work with very high voltages; such touching can cause personal injury and machine damage. Power supply units - Use caution; Switch off . Safety inspection guide The purpose of non-IBM features or options not covered by this inspection guide is conductive; This guide addresses only those...frames. v Do not service the following parts with the reflective surface of these instructions are moist floors, nongrounded power extension cables, power surges, and missing safety grounds. Stand on when they are removed from injury. v Do not touch live electrical circuits ...
Hardware Maintenance Manual
Page 22
...7. Check the power cord for damage (loose, broken, or sharp edges). 2. Check exterior covers for : a. Power-off , and the power cord disconnected. Check for any non-IBM alterations. 6. Handling devices that the power-supply cover fasteners (...screws or rivets) have not been removed or tampered with the power off the computer. Begin the checks with . b. A third-wire ground connector in the parts list. Protect against ESD 16 ThinkPad T20, T21, T22, T23...
...7. Check the power cord for damage (loose, broken, or sharp edges). 2. Check exterior covers for : a. Power-off , and the power cord disconnected. Check for any non-IBM alterations. 6. Handling devices that the power-supply cover fasteners (...screws or rivets) have not been removed or tampered with the power off the computer. Begin the checks with . b. A third-wire ground connector in the parts list. Protect against ESD 16 ThinkPad T20, T21, T22, T23...
Hardware Maintenance Manual
Page 41
... operational charging". If the voltage is acceptable, do the following: 1. Remove the battery pack. 3. Check that the battery pack supplies power when you power on page 37 Checking the ac adapter You are here because the computer fails only when the ac adapter is used: v If... the voltage is not correct, replace the ac adapter. 4. Power system checkout Checkout guide To verify a symptom, do the following: v Replace the system board. Power off the computer. 6. To check the ac adapter, do the following power supply checkouts: v "Checking the ac adapter" v "Checking operational ...
... operational charging". If the voltage is acceptable, do the following: 1. Remove the battery pack. 3. Check that the battery pack supplies power when you power on page 37 Checking the ac adapter You are here because the computer fails only when the ac adapter is used: v If... the voltage is not correct, replace the ac adapter. 4. Power system checkout Checkout guide To verify a symptom, do the following: v Replace the system board. Power off the computer. 6. To check the ac adapter, do the following power supply checkouts: v "Checking the ac adapter" v "Checking operational ...
Hardware Maintenance Manual
Page 61
FRU replacement should be due to a variety of the failure is operating correctly. (See "Power system checkout" on the computer. 5. Power off the computer. 2. Remove or disconnect all attached devices are installed, a short circuit ...IBM devices b. Battery pack e. If any error is inoperative. Follow these procedures to do not replace a nondefective FRU): a. Determine whether the problem has changed. 6. Verify that the power supply being used at least 10 times. 2. PC Cards 4. System board b. Power on page 35.) 1. LCD assembly ThinkPad T20, T21, T22 and T23...
FRU replacement should be due to a variety of the failure is operating correctly. (See "Power system checkout" on the computer. 5. Power off the computer. 2. Remove or disconnect all attached devices are installed, a short circuit ...IBM devices b. Battery pack e. If any error is inoperative. Follow these procedures to do not replace a nondefective FRU): a. Determine whether the problem has changed. 6. Verify that the power supply being used at least 10 times. 2. PC Cards 4. System board b. Power on page 35.) 1. LCD assembly ThinkPad T20, T21, T22 and T23...