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Apple power mac g4 cube User Manual

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Page 101

Power Mac G4 Cube Take Apart - 99
 Optical Drive11. Install the screws, but do not tighten until all four are in place. Do not overtighten.
12. Close the AirPort Card door and secure the antenna cable (and AirPort Card).
13. Starting with the two bottom tabs, attach the side panel as shown. Ensure all four tabs 
engage and no cables get caught.
 
14.Important: Ensure the side panel tucks into the chassis.
 
15. Reassemble and test the computer.
Warning: Never turn on the computer unless all of its...

Page 102

 
© 2002 Apple Computer, Inc. All rights reserved. 
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Service Source
Troubleshooting
 
Power Mac G4 Cube 

Page 103

 
Power Mac G4 Cube Troubleshooting -   
1  
 General Information 
General Information
 
Overview
 
This chapter includes symptom charts and other troubleshooting information for this 
computer. Troubleshooting information can also be found online in the Knowledge Base 
link at the Service Source site.  
Resetting the PMU on the Logic Board
 
The PMU (Power Management Unit) is a microcontroller chip that controls all power 
functions for this computer. The PMU is a computer within a computer. Its...

Page 104

 
2 -  
Power Mac G4 Cube Troubleshooting
 General Information 2. Press the PMU reset switch (S1) once on the logic board. Make sure the connector J4 
on the video riser card and the video riser card is installed in its connector, then 
proceed to step 3.  
Warning:  
 Do not press the PMU reset switch a second time because it could affect 
the PMU chip. S1 is located on the logic board, under the video card, near the edge 
of the logic board at the end opposite the video ports.
3. Wait ten seconds...

Page 105

 
Power Mac G4 Cube Troubleshooting -   
3  
 General Information 
Power Adapter VeriÞcation
 
To power on, the computerÕs logic board requires a trickle power of 28 V. If the system 
fails to power on, Þrst reset the PMU. Then follow the procedure below to determine if the 
symptom is related to the external power adapter.  
Note:  
 To verify the power adapter, you need a volt meter. When connecting the volt meter 
leads to speciÞc pins, make sure the power adapter cable remains securely plugged into...

Page 106

 
4 -  
Power Mac G4 Cube Troubleshooting
 General Information 5. Locate J3 on the video riser card, and check the voltages from the back of the card as 
shown below. 
6. The voltage should read 28 V (+0.5 V -1 V). Make sure the cable is securely seated in 
connector J3 on the video riser card and at J11 on the logic board. 
The testing is complete. You have just veriÞed that the power adapter is not the cause of 
the No apparent power symptom.  

Page 107

 
Power Mac G4 Cube Troubleshooting -   
5  
 General Information 
ROM and Processor VeriÞcation: Power-On Self Test
 
The ROM of the Power Mac G4 Cube computer contains a self test that runs whenever the 
computer is turned on after having been shut down. It does not run if the computer is only 
restarted. If a potential issue is detected during the test, you will not hear a startup sound; 
instead, you will see the power-on light ßash two, three, or four times.   
Note:  
 In this case, a ßash is...

Page 108

 
6 -  
Power Mac G4 Cube Troubleshooting
 General Information 
Three Flashes: Incompatible memory types are installed (for example both 
SDRAM and EDO installed)
 
Install compatible memory, as follows:
1. Shut down the computer by holding down the power button (about 5 sec.) until it shuts 
off. Then remove the power cord from the computer.
2. Remove the computer core.
3. Rotate the core so you can see the memory slots.
4. Install compatible memory. Refer to the Power Mac G4 Cube owners manual which...

Page 109

 
Power Mac G4 Cube Troubleshooting -   
7  
 General Information6. If there are no bent pins, reset the logic board as follows:
¥ Remove the video card and video riser card from the logic board.
¥ Replace the video riser card back in its slot.
¥ Locate the reset button (S1) on the logic board.
¥ Wait 10 seconds, then press S1 once. Do NOT press the reset button a second 
time.
7. Reinstall memory, and reassemble the computer and test for the symptom.
8. If the light still ßashes, replace the memory...

Page 110

 
8 -  
Power Mac G4 Cube Troubleshooting
 Symptom Charts 
Symptom Charts
 
How to Use the Symptom Charts
 
The Symptom Charts included in this chapter will help you diagnose speciÞc symptoms 
related to the product. Because cures are listed on the charts in the order of most likely 
solution, try the cures in the order presented. Verify whether or not the product continues 
to exhibit the symptom. If the symptom persists, try the next cure.  
Note: 
  If a cure instructs you to replace a module,...
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