Apple imac usb 2 0 User Manual

							
26 - iMac (USB 2.0) Troubleshooting
Modem Symptom Charts
Modem
No modem dial tone
1. Verify known-good analog (not digital) telephone line.
2. Verify known-good RJ-11 telephone cable.
3. Verify RJ-11 cable is not plugged into Ethernet port.
4. Inspect RJ-11 connector and modem port for pin damage.
5. Verify RJ-11 cable is firmly installed in the modem port.
6. Verify correct modem driver is installed and the correct CCL is selected. If the problem persists, 
reinstall system software.
7. Open the bottom housing. Verify the internal RJ-11 modem cable is connected to the modem.
8. Replace the RJ-11 board.
9. Replace the modem.
10. Replace the logic board.  
						

							
iMac (USB 2.0) Troubleshooting - 27
I/O Ports Symptom Charts
I/O Ports
Difficulty Plugging in an Ethernet Cable
Note:   The Ethernet port on an iMac (Flat Panel) has a special mechanism to prevent modem cables from 
accidentally being inserted. In some cases, this mechanism can cause difficulty when attempting to plug in 
an Ethernet cable.
1.  Verify that you are plugging into the Ethernet port. See graphic below.
2. Notice that the port has two metal tabs (circled below) which prohibit the use of a modem cable.
3. When inserting the Ethernet cable, try holding the cable at a slight angle and wiggle the connector to get  past the metal tabs.
4. Once the connector has passed the metal tabs it should slide in with no \
further difficulty. 
						

							
© 2003 Apple Computer, Inc. All rights reserved.
 Service SourceUpgrades
 iMac (USB 2.0) 
						

							
 iMac (USB 2.0)  Upgrades - 1
 Memory, SO-DIMM
Memory, SO-DIMM
Tools
• #0 Phillips screwdriver.
Part Location
The RAM expansion slot accommodates a standard DDR333 PC2700 complaint SO-
DIMM (small outline, dual inline memory) that uses DDR SDRAM devices.
Important:  A RAM expansion SO-DIMM for the iMac (USB 2.0) computer must use DDR 
SDRAM devices. If the user installs an SO-DIMM that uses single data rate (SDR), 
SGRAM, or non-DDR SDRAM devices, the computer will beep twice when the user 
attempts to restart the computer.
Note:   This procedure describes installing a SO-DIMM memory module in the user-
accessible slot. The iMac (USB 2.0) computer can accommodate standard SO-DIMMs 
with a height of 1.0 or 1.25 inches. 
						

							
2 -   iMac  (USB 2.0)  Upgrades
 Memory, SO-DIMM
Procedure
Opening the Computer
Warning: The computer must be turned off before RAM modules are removed or 
inserted. To remind you, a red LED is visible in the access door. If the red LED is on, 
power is on, and must be turned off before changing RAM modules.
1. Shut down the computer. 
2. Unplug all cables from the computer except the power cord.
3. Lay the computer down on a soft cloth. 
						

							
 iMac (USB 2.0)  Upgrades - 3
 Memory, SO-DIMM 4. Loosen the four captive screws at the base of the computer and gently remove the 
access panel.  
						

							
4 -   iMac  (USB 2.0)  Upgrades
 Memory, SO-DIMM
Important:
 To avoid electrostatic discharge, always ground yourself by touching 
metal before you touch any parts or install any components inside the co\
mputer. To 
avoid static electricity building back up in your body, do not walk arou\
nd the room 
until you have completed the installation and closed the computer. 
5. Touch a metal surface inside the computer. 
6. Unplug the power cord. 
						

							
 iMac (USB 2.0)  Upgrades - 5
 Memory, SO-DIMM
Installing the Memory Module
Note:  If you are replacing a defective memory module, rather than adding a module, 
remove the defective module before proceeding.
1. Line up the notch on the memory module with the notch on the memory slot.  Important:  Do not push the slot clips (on each side) when inserting memory. They are 
used to remove memory from the slot, not to insert memory. These clips are fragile 
and could break. 
2. Gently insert the memory module into the slot. You will hear a click when the memory  is completely inserted into the slot.  Note: Make certain to push the memory module in 
the direction of the arrows.  
						

							
6 -   iMac  (USB 2.0)  Upgrades
 Memory, SO-DIMM
Closing the Computer
1. Replace the access panel and the four screws. 
2. Reconnect all cables and restart the computer.
Warning: Never turn on the computer unless all of its internal and external 
parts are in place and it is closed. Operating the computer when it is open or 
missing parts can damage your computer or cause injury. 
						

							
 iMac (USB 2.0)  Upgrades - 7
 AirPort Extreme Card
AirPort Extreme Card 
Tools
•  #0 Phillips screwdriver to remove the user access panel.
Part Location