IBM Aptiva 2174, Hardware Maintenance Service

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Check Procedures 61
Power Supply
001 - START
ATTENTION: Check the Power Override switch, situated at the back of the
machine, just above the connector for the power cable. If this switch is
activated (switched to on), no power will be supplied to the system.
•
Power off (unplug) the system unit. Check the power cord for continuity.
Replace if necessary.
•
Check for the correct line voltage from the power outlet, and verify that the
voltage selector switch (if present) is set to the correct voltage.
•
Power on the system unit.
002 - DOES THE POWER SUPPLY FAN RUN? (YES, GO TO STEP 003.
NO, GO TO STEP 004.)
003 - DOES THE SYSTEM FAIL TO SHUT OFF WHEN THE ON/OFF
SWITCH IS PRESSED? (YES, READ AHEAD. NO, GO TO STEP 005.)
• You might have a damaged on/off switch cable assembly.
•
Disconnect the on/off switch cable assembly connector from the power
supply connector and take an ohm reading.
•
Go to step 007.
004 -
• Disconnect the power cord from the back of the system unit.
•
Disconnect all power and switch cable connectors from the system board
and the power supply.
•
Disconnect the power connectors to all drives.
• Connect any one of the power connector to system board or drive as power
load for driving up power supply.
• Reconnect the power cord and turn on the power supply.
005 - DOES THE POWER SUPPLY FAN RUN? (YES, READ AHEAD. NO,
GO TO STEP 009)
• With the system powered on and the power supply fan running, check the
voltages of the power supply connectors for the system board and all drive
connectors, as shown in the following figures.