The volt meter should measure approximately +3.3V. Connect the red lead of the volt meter to pin 1 of the power supply connector. Connect the black lead of the volt meter to pin 16 of the power supply connector for AGP and PCI models or pin 11 for Gigabit Ethernet/Digital Audio/QuickSilver/QuickSilver 2002 models.Check to see if the power supply fan is spinning.If the computer does not start up, go to the next step. If the computer starts up normally, the power supply is OK. Note: Verify that the power cable is plugged into connector J30. Start up the computer by pressing the power button on the front of the computer. Note: The four-pin connector (P4) supplies power to the multiprocessor.ĥ. Power Supply 22-Pin Connector and 4-Pin Connector Go to the next step for further verification.įigure 3. If you do measure +25V on pin 22, the power supply is likely OK. If voltage is still not present, replace the power supply otherwise, go to the next step. If you do not get a reading of +25V, re-check the volt meter connections and measure the voltage again. The volt meter should measure approximately +25V. Connect the red lead of the volt meter to pin 22 of the power supply connector.
#Apple power mac g4 desktop power cord mac
Power Mac G4 (QuickSilver/QuickSilver 2002) (see Figure 3):Ĭonnect the black lead of the volt meter to pin 11 of the 22-pin power supply connector. Go to the next step for further verification.Ĥ. If you do measure +28V on pin 22, the power supply is likely OK. If you do not get a reading of +28V, re-check the volt meter connections and measure the voltage again. The volt meter should measure approximately +28V. Power Mac G4 (Gigabit Ethernet/Digital Audio) (see Figure 2):Ĭonnect the black lead of the volt meter to pin 11 of the 22-pin power supply connector. + 12V Pin 10 +5V TRKLPin 9 POK Pin 8 GND Pin 7 +5V Pin 6 GND Pin 5 + 5V Pin 4 GND Pin 3 +3.3V Pin 2 +3.3VPin 1ģ. Go to the next step for further verification.
If you do measure +5V on pin 9, the power supply is likely OK. If voltage is still not present, replace the power supply otherwise, go to the step 4. If you do not get a reading of +5V, re-check the volt meter connections and measure the voltage again. The volt meter should measure approximately +5V. Connect the red lead of the volt meter to pin 9 of the power supply connector.
#Apple power mac g4 desktop power cord verification
Important: For this verification procedure when connecting the volt meter leads to specific pins, ensure the power supply cable remains securely plugged into the power supply connector on the logic board. Verification Procedureįollow the procedures in the Take Apart chapter to access the power supply.
Note: To verify the power supply, you need a volt meter. If the system fails to start up, follow the procedure outlined below to determine whether the problem is related to the power supply. To start up, the Power Mac G4 logic board requires a "trickle" power of +5V for AGP and PCI models, +28V for Gigabit Ethernet/ Digital Audio models, or +25V for QuickSilver models.